When sched_cache is enabled, fully scanning all online
CPUs to find the hottest one is very costly. As a first
step, limit the scan to only the CPUs within the task's
preferred node. If the node containing the task's preferred
LLC is not in the CPU scan mask, add it. Additionally, if
the node where the current task is running is not in the
scan mask, add it too.
Suggested-by: Jianyong Wu <jianyong.wu@outlook.com>
Suggested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
kernel/sched/fair.c | 36 +++++++++++++++++++++++++++++++++---
1 file changed, 33 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 64f757ad39fc..420d3a080990 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1390,13 +1390,36 @@ static void task_tick_cache(struct rq *rq, struct task_struct *p)
}
}
+static void get_scan_cpumasks(cpumask_var_t cpus, int cache_cpu,
+ int pref_nid, int curr_cpu)
+{
+#ifdef CONFIG_NUMA_BALANCING
+ /* first honor the task's preferred node */
+ if (pref_nid != NUMA_NO_NODE)
+ cpumask_or(cpus, cpus, cpumask_of_node(pref_nid));
+#endif
+
+ /* secondly honor the task's cache CPU if it is not included */
+ if (cache_cpu != -1 && !cpumask_test_cpu(cache_cpu, cpus))
+ cpumask_or(cpus, cpus,
+ cpumask_of_node(cpu_to_node(cache_cpu)));
+
+ /*
+ * Thirdly honor the task's current running node
+ * as the last resort.
+ */
+ if (!cpumask_test_cpu(curr_cpu, cpus))
+ cpumask_or(cpus, cpus, cpumask_of_node(cpu_to_node(curr_cpu)));
+}
+
static void __no_profile task_cache_work(struct callback_head *work)
{
struct task_struct *p = current;
struct mm_struct *mm = p->mm;
unsigned long m_a_occ = 0;
unsigned long last_m_a_occ = 0;
- int cpu, m_a_cpu = -1;
+ int cpu, m_a_cpu = -1, cache_cpu,
+ pref_nid = NUMA_NO_NODE, curr_cpu = smp_processor_id();
cpumask_var_t cpus;
WARN_ON_ONCE(work != &p->cache_work);
@@ -1406,11 +1429,18 @@ static void __no_profile task_cache_work(struct callback_head *work)
if (p->flags & PF_EXITING)
return;
- if (!alloc_cpumask_var(&cpus, GFP_KERNEL))
+ if (!zalloc_cpumask_var(&cpus, GFP_KERNEL))
return;
+ cache_cpu = mm->mm_sched_cpu;
+#ifdef CONFIG_NUMA_BALANCING
+ if (static_branch_likely(&sched_numa_balancing))
+ pref_nid = p->numa_preferred_nid;
+#endif
+
scoped_guard (cpus_read_lock) {
- cpumask_copy(cpus, cpu_online_mask);
+ get_scan_cpumasks(cpus, cache_cpu,
+ pref_nid, curr_cpu);
for_each_cpu(cpu, cpus) {
/* XXX sched_cluster_active */
--
2.25.1
Hello,
kernel test robot noticed "BUG:using_smp_processor_id()in_preemptible" on:
commit: ff797757d658ecda432e4c33c0cfc2b704af2b06 ("[RFC PATCH v4 23/28] sched: Scan a task's preferred node for preferred LLC")
url: https://github.com/intel-lab-lkp/linux/commits/Chen-Yu/sched-Cache-aware-load-balancing/20250809-131716
base: v6.16
patch link: https://lore.kernel.org/all/178bf43d7cbc9b2c9aea408dd56b87391067df37.1754712565.git.tim.c.chen@linux.intel.com/
patch subject: [RFC PATCH v4 23/28] sched: Scan a task's preferred node for preferred LLC
in testcase: boot
config: x86_64-randconfig-103-20250810
compiler: gcc-12
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+------------------------------------------------------+------------+------------+
| | 552a2db758 | ff797757d6 |
+------------------------------------------------------+------------+------------+
| BUG:using_smp_processor_id()in_preemptible | 0 | 11 |
+------------------------------------------------------+------------+------------+
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202508120315.19f6266a-lkp@intel.com
[ 19.177186][ T64] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/64
[ 19.179622][ T64] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.181347][ T64] CPU: 0 UID: 0 PID: 64 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.181372][ T64] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.181385][ T64] Call Trace:
[ 19.181391][ T64] <TASK>
[ 19.181401][ T64] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.181440][ T64] dump_stack (lib/dump_stack.c:130)
[ 19.181465][ T64] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.181494][ T64] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.181514][ T64] task_cache_work (kernel/sched/fair.c:1422)
[ 19.181531][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.181569][ T64] ? lock_is_held (include/linux/lockdep.h:249)
[ 19.181594][ T64] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.181626][ T64] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.181642][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.181663][ T64] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.181697][ T64] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.181724][ T64] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.181747][ T64] ? preempt_latency_start (include/linux/ftrace.h:1091 kernel/sched/core.c:5866)
[ 19.181782][ T64] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.181817][ T64] irqentry_exit_to_user_mode (kernel/entry/common.c:124 include/linux/entry-common.h:330 kernel/entry/common.c:184)
[ 19.181843][ T64] irqentry_exit (kernel/entry/common.c:287)
[ 19.181862][ T64] exc_page_fault (arch/x86/mm/fault.c:1536)
[ 19.181898][ T64] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623)
[ 19.181916][ T64] RIP: 0023:0xf7ee9067
[ 19.181933][ T64] Code: fe ff ff 8b 00 85 c0 0f 84 96 00 00 00 8b 8d 60 fe ff ff 8b 51 30 85 d2 74 03 01 42 04 8b 8d 60 fe ff ff 8b 51 2c 85 d2 74 03 <01> 42 04 8b bd 60 fe ff ff 8b 57 34 85 d2 74 03 01 42 04 8b 8d 60
All code
========
0: fe (bad)
1: ff (bad)
2: ff 8b 00 85 c0 0f decl 0xfc08500(%rbx)
8: 84 96 00 00 00 8b test %dl,-0x75000000(%rsi)
e: 8d 60 fe lea -0x2(%rax),%esp
11: ff (bad)
12: ff 8b 51 30 85 d2 decl -0x2d7acfaf(%rbx)
18: 74 03 je 0x1d
1a: 01 42 04 add %eax,0x4(%rdx)
1d: 8b 8d 60 fe ff ff mov -0x1a0(%rbp),%ecx
23: 8b 51 2c mov 0x2c(%rcx),%edx
26: 85 d2 test %edx,%edx
28: 74 03 je 0x2d
2a:* 01 42 04 add %eax,0x4(%rdx) <-- trapping instruction
2d: 8b bd 60 fe ff ff mov -0x1a0(%rbp),%edi
33: 8b 57 34 mov 0x34(%rdi),%edx
36: 85 d2 test %edx,%edx
38: 74 03 je 0x3d
3a: 01 42 04 add %eax,0x4(%rdx)
3d: 8b .byte 0x8b
3e: 8d .byte 0x8d
3f: 60 (bad)
Code starting with the faulting instruction
===========================================
0: 01 42 04 add %eax,0x4(%rdx)
3: 8b bd 60 fe ff ff mov -0x1a0(%rbp),%edi
9: 8b 57 34 mov 0x34(%rdi),%edx
c: 85 d2 test %edx,%edx
e: 74 03 je 0x13
10: 01 42 04 add %eax,0x4(%rdx)
13: 8b .byte 0x8b
14: 8d .byte 0x8d
15: 60 (bad)
[ 19.181949][ T64] RSP: 002b:00000000fffd59c0 EFLAGS: 00010206
[ 19.181966][ T64] RAX: 00000000565ad000 RBX: 0000000000000001 RCX: 00000000f7f11980
[ 19.181978][ T64] RDX: 00000000565dbd44 RSI: 00000000effffef5 RDI: 000000006fffffff
[ 19.181990][ T64] RBP: 00000000fffd5bb8 R08: 0000000000000000 R09: 0000000000000000
[ 19.182001][ T64] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.182013][ T64] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.182063][ T64] </TASK>
[ 19.230078][ T64] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/64
[ 19.230948][ T64] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.231549][ T64] CPU: 0 UID: 0 PID: 64 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.231557][ T64] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.231561][ T64] Call Trace:
[ 19.231564][ T64] <TASK>
[ 19.231567][ T64] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.231580][ T64] dump_stack (lib/dump_stack.c:130)
[ 19.231588][ T64] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.231598][ T64] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.231604][ T64] task_cache_work (kernel/sched/fair.c:1422)
[ 19.231615][ T64] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.231627][ T64] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.231637][ T64] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.231643][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.231649][ T64] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.231659][ T64] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.231668][ T64] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.231680][ T64] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.231691][ T64] irqentry_exit_to_user_mode (kernel/entry/common.c:124 include/linux/entry-common.h:330 kernel/entry/common.c:184)
[ 19.231699][ T64] irqentry_exit (kernel/entry/common.c:287)
[ 19.231705][ T64] exc_page_fault (arch/x86/mm/fault.c:1536)
[ 19.231717][ T64] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623)
[ 19.231723][ T64] RIP: 0023:0xf7f03797
[ 19.231729][ T64] Code: 24 0c e3 2c 89 d7 83 e2 03 74 11 7a 04 aa 49 74 1f aa 49 74 1b 83 f2 01 75 02 aa 49 89 ca c1 e9 02 83 e2 03 69 c0 01 01 01 01 <f3> ab 89 d1 f3 aa 8b 44 24 08 5f c3 66 90 66 90 66 90 66 90 66 90
All code
========
0: 24 0c and $0xc,%al
2: e3 2c jrcxz 0x30
4: 89 d7 mov %edx,%edi
6: 83 e2 03 and $0x3,%edx
9: 74 11 je 0x1c
b: 7a 04 jp 0x11
d: aa stos %al,%es:(%rdi)
e: 49 74 1f rex.WB je 0x30
11: aa stos %al,%es:(%rdi)
12: 49 74 1b rex.WB je 0x30
15: 83 f2 01 xor $0x1,%edx
18: 75 02 jne 0x1c
1a: aa stos %al,%es:(%rdi)
1b: 49 89 ca mov %rcx,%r10
1e: c1 e9 02 shr $0x2,%ecx
21: 83 e2 03 and $0x3,%edx
24: 69 c0 01 01 01 01 imul $0x1010101,%eax,%eax
2a:* f3 ab rep stos %eax,%es:(%rdi) <-- trapping instruction
2c: 89 d1 mov %edx,%ecx
2e: f3 aa rep stos %al,%es:(%rdi)
30: 8b 44 24 08 mov 0x8(%rsp),%eax
34: 5f pop %rdi
35: c3 ret
36: 66 90 xchg %ax,%ax
38: 66 90 xchg %ax,%ax
3a: 66 90 xchg %ax,%ax
3c: 66 90 xchg %ax,%ax
3e: 66 90 xchg %ax,%ax
Code starting with the faulting instruction
===========================================
0: f3 ab rep stos %eax,%es:(%rdi)
2: 89 d1 mov %edx,%ecx
4: f3 aa rep stos %al,%es:(%rdi)
6: 8b 44 24 08 mov 0x8(%rsp),%eax
a: 5f pop %rdi
b: c3 ret
c: 66 90 xchg %ax,%ax
e: 66 90 xchg %ax,%ax
10: 66 90 xchg %ax,%ax
12: 66 90 xchg %ax,%ax
14: 66 90 xchg %ax,%ax
[ 19.231735][ T64] RSP: 002b:00000000fffd4f58 EFLAGS: 00010206
[ 19.231741][ T64] RAX: 0000000000000000 RBX: 00000000f7f11000 RCX: 0000000000000001
[ 19.231745][ T64] RDX: 0000000000000000 RSI: 00000000f7edf148 RDI: 00000000f7edf144
[ 19.231749][ T64] RBP: 00000000fffd5138 R08: 0000000000000000 R09: 0000000000000000
[ 19.231753][ T64] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.231756][ T64] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.231771][ T64] </TASK>
[ 19.251371][ T64] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/64
[ 19.252249][ T64] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.252877][ T64] CPU: 0 UID: 0 PID: 64 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.252886][ T64] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.252890][ T64] Call Trace:
[ 19.252892][ T64] <TASK>
[ 19.252895][ T64] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.252907][ T64] dump_stack (lib/dump_stack.c:130)
[ 19.252916][ T64] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.252925][ T64] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.252931][ T64] task_cache_work (kernel/sched/fair.c:1422)
[ 19.252941][ T64] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.252953][ T64] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.252963][ T64] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.252969][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.252976][ T64] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.252985][ T64] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.252994][ T64] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.253006][ T64] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.253018][ T64] exit_to_user_mode_loop (kernel/entry/common.c:124)
[ 19.253025][ T64] do_int80_emulation (include/linux/entry-common.h:332 include/linux/entry-common.h:414 include/linux/entry-common.h:449 arch/x86/entry/syscall_32.c:175)
[ 19.253035][ T64] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.253044][ T64] ? preempt_latency_start (include/linux/ftrace.h:1091 kernel/sched/core.c:5866)
[ 19.253055][ T64] ? __up_write (arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1375)
[ 19.253061][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.253070][ T64] ? validate_chain (kernel/locking/lockdep.c:3826 kernel/locking/lockdep.c:3879)
[ 19.253081][ T64] ? __lock_acquire (kernel/locking/lockdep.c:5240)
[ 19.253093][ T64] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.253106][ T64] ? validate_chain (kernel/locking/lockdep.c:3826 kernel/locking/lockdep.c:3879)
[ 19.253117][ T64] ? __lock_acquire (kernel/locking/lockdep.c:5240)
[ 19.253128][ T64] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.253138][ T64] ? vtime_user_exit (kernel/sched/cputime.c:737)
[ 19.253149][ T64] ? vtime_user_exit (kernel/sched/cputime.c:737)
[ 19.253159][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.253170][ T64] ? debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.253177][ T64] ? rcu_is_watching (include/linux/context_tracking.h:128 kernel/rcu/tree.c:745)
[ 19.253185][ T64] ? trace_irq_disable (include/trace/events/preemptirq.h:36 (discriminator 21))
[ 19.253195][ T64] ? trace_hardirqs_off_finish (kernel/trace/trace_preemptirq.c:98)
[ 19.253203][ T64] ? do_int80_emulation (arch/x86/include/asm/jump_label.h:36 arch/x86/entry/syscall_32.c:148)
[ 19.253212][ T64] asm_int80_emulation (arch/x86/include/asm/idtentry.h:626)
[ 19.253218][ T64] RIP: 0023:0xf7f02cb0
[ 19.253223][ T64] Code: 4c 24 34 89 44 24 0c 8b 44 24 44 8b 54 24 38 8b 74 24 3c 8b 7c 24 40 a9 ff 0f 00 00 75 1c c1 e8 0c 89 c5 b8 c0 00 00 00 cd 80 <3d> 00 f0 ff ff 77 21 83 c4 1c 5b 5e 5f 5d c3 90 83 c4 1c b8 ea ff
All code
========
0: 4c 24 34 rex.WR and $0x34,%al
3: 89 44 24 0c mov %eax,0xc(%rsp)
7: 8b 44 24 44 mov 0x44(%rsp),%eax
b: 8b 54 24 38 mov 0x38(%rsp),%edx
f: 8b 74 24 3c mov 0x3c(%rsp),%esi
13: 8b 7c 24 40 mov 0x40(%rsp),%edi
17: a9 ff 0f 00 00 test $0xfff,%eax
1c: 75 1c jne 0x3a
1e: c1 e8 0c shr $0xc,%eax
21: 89 c5 mov %eax,%ebp
23: b8 c0 00 00 00 mov $0xc0,%eax
28: cd 80 int $0x80
2a:* 3d 00 f0 ff ff cmp $0xfffff000,%eax <-- trapping instruction
2f: 77 21 ja 0x52
31: 83 c4 1c add $0x1c,%esp
34: 5b pop %rbx
35: 5e pop %rsi
36: 5f pop %rdi
37: 5d pop %rbp
38: c3 ret
39: 90 nop
3a: 83 c4 1c add $0x1c,%esp
3d: b8 .byte 0xb8
3e: ea (bad)
3f: ff .byte 0xff
Code starting with the faulting instruction
===========================================
0: 3d 00 f0 ff ff cmp $0xfffff000,%eax
5: 77 21 ja 0x28
7: 83 c4 1c add $0x1c,%esp
a: 5b pop %rbx
b: 5e pop %rsi
c: 5f pop %rdi
d: 5d pop %rbp
e: c3 ret
f: 90 nop
10: 83 c4 1c add $0x1c,%esp
13: b8 .byte 0xb8
14: ea (bad)
15: ff .byte 0xff
[ 19.253229][ T64] RSP: 002b:00000000fffd4f00 EFLAGS: 00000202 ORIG_RAX: 00000000000000c0
[ 19.253236][ T64] RAX: 00000000f7db9000 RBX: 00000000f7db9000 RCX: 00000000000da000
[ 19.253240][ T64] RDX: 0000000000000001 RSI: 0000000000000812 RDI: 0000000000000000
[ 19.253244][ T64] RBP: 00000000000001ce R08: 0000000000000000 R09: 0000000000000000
[ 19.253248][ T64] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.253251][ T64] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.253266][ T64] </TASK>
[ 19.256786][ T64] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/64
[ 19.304780][ T64] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.305760][ T64] CPU: 1 UID: 0 PID: 64 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.305774][ T64] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.305782][ T64] Call Trace:
[ 19.305787][ T64] <TASK>
[ 19.305795][ T64] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.305817][ T64] dump_stack (lib/dump_stack.c:130)
[ 19.305832][ T64] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.305849][ T64] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.305862][ T64] task_cache_work (kernel/sched/fair.c:1422)
[ 19.305881][ T64] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.305903][ T64] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.305921][ T64] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.305931][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.305944][ T64] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.305962][ T64] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.305980][ T64] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.306002][ T64] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.306023][ T64] irqentry_exit_to_user_mode (kernel/entry/common.c:124 include/linux/entry-common.h:330 kernel/entry/common.c:184)
[ 19.306039][ T64] irqentry_exit (kernel/entry/common.c:287)
[ 19.306050][ T64] exc_page_fault (arch/x86/mm/fault.c:1536)
[ 19.306072][ T64] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623)
[ 19.306083][ T64] RIP: 0023:0xf7db80cb
[ 19.306094][ T64] Code: 01 00 00 00 83 c4 08 5b c3 66 90 66 90 66 90 55 53 56 57 31 d2 9c 58 89 c1 35 00 00 20 00 50 9d 9c 58 31 c1 31 c0 8b 74 24 14 <89> 46 08 0f ba e1 15 0f 83 6b 01 00 00 0f a2 89 c7 31 c0 81 fb 47
All code
========
0: 01 00 add %eax,(%rax)
2: 00 00 add %al,(%rax)
4: 83 c4 08 add $0x8,%esp
7: 5b pop %rbx
8: c3 ret
9: 66 90 xchg %ax,%ax
b: 66 90 xchg %ax,%ax
d: 66 90 xchg %ax,%ax
f: 55 push %rbp
10: 53 push %rbx
11: 56 push %rsi
12: 57 push %rdi
13: 31 d2 xor %edx,%edx
15: 9c pushf
16: 58 pop %rax
17: 89 c1 mov %eax,%ecx
19: 35 00 00 20 00 xor $0x200000,%eax
1e: 50 push %rax
1f: 9d popf
20: 9c pushf
21: 58 pop %rax
22: 31 c1 xor %eax,%ecx
24: 31 c0 xor %eax,%eax
26: 8b 74 24 14 mov 0x14(%rsp),%esi
2a:* 89 46 08 mov %eax,0x8(%rsi) <-- trapping instruction
2d: 0f ba e1 15 bt $0x15,%ecx
31: 0f 83 6b 01 00 00 jae 0x1a2
37: 0f a2 cpuid
39: 89 c7 mov %eax,%edi
3b: 31 c0 xor %eax,%eax
3d: 81 .byte 0x81
3e: fb sti
3f: 47 rex.RXB
Code starting with the faulting instruction
===========================================
0: 89 46 08 mov %eax,0x8(%rsi)
3: 0f ba e1 15 bt $0x15,%ecx
7: 0f 83 6b 01 00 00 jae 0x178
d: 0f a2 cpuid
f: 89 c7 mov %eax,%edi
11: 31 c0 xor %eax,%eax
13: 81 .byte 0x81
14: fb sti
15: 47 rex.RXB
[ 19.306104][ T64] RSP: 002b:00000000fffd5bd8 EFLAGS: 00210246
[ 19.306115][ T64] RAX: 0000000000000000 RBX: 00000000f7eac684 RCX: 0000000000200000
[ 19.306123][ T64] RDX: 0000000000000000 RSI: 00000000f7eb3ad0 RDI: 00000000f7eb3ad0
[ 19.306131][ T64] RBP: 00000000f7eac684 R08: 0000000000000000 R09: 0000000000000000
[ 19.306138][ T64] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.306145][ T64] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.306175][ T64] </TASK>
[ 19.328981][ T64] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/64
[ 19.329865][ T64] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.330477][ T64] CPU: 1 UID: 0 PID: 64 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.330486][ T64] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.330490][ T64] Call Trace:
[ 19.330492][ T64] <TASK>
[ 19.330495][ T64] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.330508][ T64] dump_stack (lib/dump_stack.c:130)
[ 19.330516][ T64] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.330525][ T64] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.330531][ T64] task_cache_work (kernel/sched/fair.c:1422)
[ 19.330541][ T64] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.330553][ T64] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.330564][ T64] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.330569][ T64] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.330576][ T64] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.330586][ T64] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.330595][ T64] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.330606][ T64] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.330618][ T64] irqentry_exit_to_user_mode (kernel/entry/common.c:124 include/linux/entry-common.h:330 kernel/entry/common.c:184)
[ 19.330626][ T64] irqentry_exit (kernel/entry/common.c:287)
[ 19.330632][ T64] exc_page_fault (arch/x86/mm/fault.c:1536)
[ 19.330644][ T64] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623)
[ 19.330650][ T64] RIP: 0023:0xf7a9f4c0
[ 19.330656][ T64] Code: 57 8d 1c 06 e8 21 0d 00 00 83 c4 0c c6 04 03 00 50 57 53 89 eb e8 70 15 00 00 83 c4 1c 89 f0 5b 5e 5f 5d c3 66 90 66 90 66 90 <57> 8b 4c 24 08 66 0f 6e 4c 24 0c 66 0f ef d2 89 cf 66 0f 60 c9 66
All code
========
0: 57 push %rdi
1: 8d 1c 06 lea (%rsi,%rax,1),%ebx
4: e8 21 0d 00 00 call 0xd2a
9: 83 c4 0c add $0xc,%esp
c: c6 04 03 00 movb $0x0,(%rbx,%rax,1)
10: 50 push %rax
11: 57 push %rdi
12: 53 push %rbx
13: 89 eb mov %ebp,%ebx
15: e8 70 15 00 00 call 0x158a
1a: 83 c4 1c add $0x1c,%esp
1d: 89 f0 mov %esi,%eax
1f: 5b pop %rbx
20: 5e pop %rsi
21: 5f pop %rdi
22: 5d pop %rbp
23: c3 ret
24: 66 90 xchg %ax,%ax
26: 66 90 xchg %ax,%ax
28: 66 90 xchg %ax,%ax
2a:* 57 push %rdi <-- trapping instruction
2b: 8b 4c 24 08 mov 0x8(%rsp),%ecx
2f: 66 0f 6e 4c 24 0c movd 0xc(%rsp),%xmm1
35: 66 0f ef d2 pxor %xmm2,%xmm2
39: 89 cf mov %ecx,%edi
3b: 66 0f 60 c9 punpcklbw %xmm1,%xmm1
3f: 66 data16
Code starting with the faulting instruction
===========================================
0: 57 push %rdi
1: 8b 4c 24 08 mov 0x8(%rsp),%ecx
5: 66 0f 6e 4c 24 0c movd 0xc(%rsp),%xmm1
b: 66 0f ef d2 pxor %xmm2,%xmm2
f: 89 cf mov %ecx,%edi
11: 66 0f 60 c9 punpcklbw %xmm1,%xmm1
15: 66 data16
[ 19.330662][ T64] RSP: 002b:00000000fffd38cc EFLAGS: 00210246
[ 19.330667][ T64] RAX: 0000000000000000 RBX: 00000000565dbdd4 RCX: 00000000fffd49a8
[ 19.330671][ T64] RDX: 0000000000000000 RSI: 00000000fffd394c RDI: 000000005799e1f0
[ 19.330675][ T64] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 19.330679][ T64] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.330682][ T64] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.330697][ T64] </TASK>
[ 19.332542][ T64] modprobe (64) used greatest stack depth: 25120 bytes left
[ 19.344814][ T65] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/65
[ 19.360113][ T65] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.361051][ T65] CPU: 0 UID: 0 PID: 65 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.361065][ T65] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.361071][ T65] Call Trace:
[ 19.361074][ T65] <TASK>
[ 19.361079][ T65] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.361099][ T65] dump_stack (lib/dump_stack.c:130)
[ 19.361111][ T65] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.361125][ T65] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.361136][ T65] task_cache_work (kernel/sched/fair.c:1422)
[ 19.361144][ T65] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.361162][ T65] ? lock_is_held (include/linux/lockdep.h:249)
[ 19.361175][ T65] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.361191][ T65] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.361199][ T65] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.361210][ T65] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.361225][ T65] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.361238][ T65] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.361256][ T65] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.361273][ T65] irqentry_exit_to_user_mode (kernel/entry/common.c:124 include/linux/entry-common.h:330 kernel/entry/common.c:184)
[ 19.361286][ T65] irqentry_exit (kernel/entry/common.c:287)
[ 19.361295][ T65] exc_page_fault (arch/x86/mm/fault.c:1536)
[ 19.361313][ T65] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623)
[ 19.361322][ T65] RIP: 0023:0xf7f7b148
[ 19.361330][ T65] Code: bb 41 ff ff 6f 29 d3 89 04 99 e9 f1 fe ff ff 8b b5 74 ff ff ff 85 f6 74 60 8b 47 30 85 c0 74 03 01 70 04 8b 47 2c 85 c0 74 03 <01> 70 04 8b 47 34 85 c0 74 03 01 70 04 8b 47 38 85 c0 74 03 01 70
All code
========
0: bb 41 ff ff 6f mov $0x6fffff41,%ebx
5: 29 d3 sub %edx,%ebx
7: 89 04 99 mov %eax,(%rcx,%rbx,4)
a: e9 f1 fe ff ff jmp 0xffffffffffffff00
f: 8b b5 74 ff ff ff mov -0x8c(%rbp),%esi
15: 85 f6 test %esi,%esi
17: 74 60 je 0x79
19: 8b 47 30 mov 0x30(%rdi),%eax
1c: 85 c0 test %eax,%eax
1e: 74 03 je 0x23
20: 01 70 04 add %esi,0x4(%rax)
23: 8b 47 2c mov 0x2c(%rdi),%eax
26: 85 c0 test %eax,%eax
28: 74 03 je 0x2d
2a:* 01 70 04 add %esi,0x4(%rax) <-- trapping instruction
2d: 8b 47 34 mov 0x34(%rdi),%eax
30: 85 c0 test %eax,%eax
32: 74 03 je 0x37
34: 01 70 04 add %esi,0x4(%rax)
37: 8b 47 38 mov 0x38(%rdi),%eax
3a: 85 c0 test %eax,%eax
3c: 74 03 je 0x41
3e: 01 .byte 0x1
3f: 70 .byte 0x70
Code starting with the faulting instruction
===========================================
0: 01 70 04 add %esi,0x4(%rax)
3: 8b 47 34 mov 0x34(%rdi),%eax
6: 85 c0 test %eax,%eax
8: 74 03 je 0xd
a: 01 70 04 add %esi,0x4(%rax)
d: 8b 47 38 mov 0x38(%rdi),%eax
10: 85 c0 test %eax,%eax
12: 74 03 je 0x17
14: 01 .byte 0x1
15: 70 .byte 0x70
[ 19.361339][ T65] RSP: 002b:00000000ffdeddc0 EFLAGS: 00010286
[ 19.361348][ T65] RAX: 00000000f7f395e4 RBX: 0000000000000028 RCX: 00000000f7f6d310
[ 19.361355][ T65] RDX: 0000000000000000 RSI: 00000000f7c78000 RDI: 00000000f7f6d2f0
[ 19.361361][ T65] RBP: 00000000ffdedea8 R08: 0000000000000000 R09: 0000000000000000
[ 19.361367][ T65] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.361372][ T65] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.361395][ T65] </TASK>
[ 19.405251][ T65] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/65
[ 19.406850][ T65] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.407947][ T65] CPU: 0 UID: 0 PID: 65 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.407964][ T65] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.407972][ T65] Call Trace:
[ 19.407977][ T65] <TASK>
[ 19.407984][ T65] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.408010][ T65] dump_stack (lib/dump_stack.c:130)
[ 19.408027][ T65] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.408048][ T65] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.408062][ T65] task_cache_work (kernel/sched/fair.c:1422)
[ 19.408083][ T65] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.408108][ T65] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.408130][ T65] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.408141][ T65] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.408155][ T65] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.408182][ T65] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.408198][ T65] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.408211][ T65] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.408225][ T65] irqentry_exit_to_user_mode (kernel/entry/common.c:124 include/linux/entry-common.h:330 kernel/entry/common.c:184)
[ 19.408235][ T65] irqentry_exit (kernel/entry/common.c:287)
[ 19.408242][ T65] exc_page_fault (arch/x86/mm/fault.c:1536)
[ 19.408256][ T65] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623)
[ 19.408264][ T65] RIP: 0023:0xf7b9cca0
[ 19.408271][ T65] Code: 04 00 00 00 c7 44 24 2c 03 00 00 00 e9 3a fe ff ff e8 a4 1e 00 00 66 90 66 90 c3 66 90 66 90 66 90 66 90 66 90 66 90 66 90 90 <e8> 14 01 03 00 05 5b 73 0d 00 53 8b 88 f4 fe ff ff 8d 90 e0 38 f6
All code
========
0: 04 00 add $0x0,%al
2: 00 00 add %al,(%rax)
4: c7 44 24 2c 03 00 00 movl $0x3,0x2c(%rsp)
b: 00
c: e9 3a fe ff ff jmp 0xfffffffffffffe4b
11: e8 a4 1e 00 00 call 0x1eba
16: 66 90 xchg %ax,%ax
18: 66 90 xchg %ax,%ax
1a: c3 ret
1b: 66 90 xchg %ax,%ax
1d: 66 90 xchg %ax,%ax
1f: 66 90 xchg %ax,%ax
21: 66 90 xchg %ax,%ax
23: 66 90 xchg %ax,%ax
25: 66 90 xchg %ax,%ax
27: 66 90 xchg %ax,%ax
29: 90 nop
2a:* e8 14 01 03 00 call 0x30143 <-- trapping instruction
2f: 05 5b 73 0d 00 add $0xd735b,%eax
34: 53 push %rbx
35: 8b 88 f4 fe ff ff mov -0x10c(%rax),%ecx
3b: 8d .byte 0x8d
3c: 90 nop
3d: e0 38 loopne 0x77
3f: f6 .byte 0xf6
Code starting with the faulting instruction
===========================================
0: e8 14 01 03 00 call 0x30119
5: 05 5b 73 0d 00 add $0xd735b,%eax
a: 53 push %rbx
b: 8b 88 f4 fe ff ff mov -0x10c(%rax),%ecx
11: 8d .byte 0x8d
12: 90 nop
13: e0 38 loopne 0x4d
15: f6 .byte 0xf6
[ 19.408277][ T65] RSP: 002b:00000000ffdee69c EFLAGS: 00010202
[ 19.408285][ T65] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00000000f7f6d5d0
[ 19.408289][ T65] RDX: 0000000000000015 RSI: 00000000f7c81904 RDI: 00000000f7b9cca0
[ 19.408294][ T65] RBP: 00000000ffdee738 R08: 0000000000000000 R09: 0000000000000000
[ 19.408299][ T65] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.408303][ T65] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.408320][ T65] </TASK>
[ 19.430721][ T65] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/65
[ 19.431596][ T65] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.432219][ T65] CPU: 0 UID: 0 PID: 65 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.432227][ T65] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.432232][ T65] Call Trace:
[ 19.432234][ T65] <TASK>
[ 19.432237][ T65] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.432250][ T65] dump_stack (lib/dump_stack.c:130)
[ 19.432258][ T65] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.432267][ T65] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.432274][ T65] task_cache_work (kernel/sched/fair.c:1422)
[ 19.432283][ T65] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.432295][ T65] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.432306][ T65] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.432311][ T65] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.432318][ T65] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.432327][ T65] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.432336][ T65] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.432348][ T65] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.432359][ T65] exit_to_user_mode_loop (kernel/entry/common.c:124)
[ 19.432367][ T65] do_int80_emulation (include/linux/entry-common.h:332 include/linux/entry-common.h:414 include/linux/entry-common.h:449 arch/x86/entry/syscall_32.c:175)
[ 19.432375][ T65] ? rcu_read_unlock (include/linux/rcupdate.h:874 (discriminator 9))
[ 19.432381][ T65] ? do_read_fault (mm/memory.c:5600)
[ 19.432394][ T65] ? do_pte_missing (mm/memory.c:4252)
[ 19.432401][ T65] ? handle_pte_fault (mm/memory.c:6069)
[ 19.432412][ T65] ? handle_pte_fault (mm/memory.c:6026)
[ 19.432421][ T65] ? __pfx_handle_pte_fault (mm/memory.c:6026)
[ 19.432430][ T65] ? validate_chain (kernel/locking/lockdep.c:3826 kernel/locking/lockdep.c:3879)
[ 19.432439][ T65] ? validate_chain (kernel/locking/lockdep.c:3826 kernel/locking/lockdep.c:3879)
[ 19.432449][ T65] ? __lock_acquire (kernel/locking/lockdep.c:5240)
[ 19.432461][ T65] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.432471][ T65] ? vtime_user_exit (kernel/sched/cputime.c:737)
[ 19.432482][ T65] ? vtime_user_exit (kernel/sched/cputime.c:737)
[ 19.432492][ T65] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.432504][ T65] ? debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.432510][ T65] ? rcu_is_watching (include/linux/context_tracking.h:128 kernel/rcu/tree.c:745)
[ 19.432519][ T65] ? trace_irq_disable (include/trace/events/preemptirq.h:36 (discriminator 21))
[ 19.432529][ T65] ? trace_hardirqs_off_finish (kernel/trace/trace_preemptirq.c:98)
[ 19.432537][ T65] ? do_int80_emulation (arch/x86/include/asm/jump_label.h:36 arch/x86/entry/syscall_32.c:148)
[ 19.432546][ T65] asm_int80_emulation (arch/x86/include/asm/idtentry.h:626)
[ 19.432552][ T65] RIP: 0023:0xf7f8fd24
[ 19.432558][ T65] Code: b8 5b 00 00 00 cd 80 89 d3 3d 01 f0 ff ff 0f 83 b2 ef ff ff c3 90 53 8b 54 24 10 8b 4c 24 0c 8b 5c 24 08 b8 7d 00 00 00 cd 80 <5b> 3d 01 f0 ff ff 0f 83 90 ef ff ff c3 66 90 66 90 66 90 66 90 66
All code
========
0: b8 5b 00 00 00 mov $0x5b,%eax
5: cd 80 int $0x80
7: 89 d3 mov %edx,%ebx
9: 3d 01 f0 ff ff cmp $0xfffff001,%eax
e: 0f 83 b2 ef ff ff jae 0xffffffffffffefc6
14: c3 ret
15: 90 nop
16: 53 push %rbx
17: 8b 54 24 10 mov 0x10(%rsp),%edx
1b: 8b 4c 24 0c mov 0xc(%rsp),%ecx
1f: 8b 5c 24 08 mov 0x8(%rsp),%ebx
23: b8 7d 00 00 00 mov $0x7d,%eax
28: cd 80 int $0x80
2a:* 5b pop %rbx <-- trapping instruction
2b: 3d 01 f0 ff ff cmp $0xfffff001,%eax
30: 0f 83 90 ef ff ff jae 0xffffffffffffefc6
36: c3 ret
37: 66 90 xchg %ax,%ax
39: 66 90 xchg %ax,%ax
3b: 66 90 xchg %ax,%ax
3d: 66 90 xchg %ax,%ax
3f: 66 data16
Code starting with the faulting instruction
===========================================
0: 5b pop %rbx
1: 3d 01 f0 ff ff cmp $0xfffff001,%eax
6: 0f 83 90 ef ff ff jae 0xffffffffffffef9c
c: c3 ret
d: 66 90 xchg %ax,%ax
f: 66 90 xchg %ax,%ax
11: 66 90 xchg %ax,%ax
13: 66 90 xchg %ax,%ax
15: 66 data16
[ 19.432564][ T65] RSP: 002b:00000000ffdee668 EFLAGS: 00000206 ORIG_RAX: 000000000000007d
[ 19.432571][ T65] RAX: 0000000000000000 RBX: 00000000f7f21000 RCX: 000000000001b000
[ 19.432575][ T65] RDX: 0000000000000001 RSI: 00000000f7f9e000 RDI: 00000000f7f6d2f0
[ 19.432579][ T65] RBP: 00000000ffdee738 R08: 0000000000000000 R09: 0000000000000000
[ 19.432583][ T65] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.432586][ T65] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.432601][ T65] </TASK>
[ 19.477057][ T66] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/66
[ 19.481747][ T66] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.484904][ T66] CPU: 1 UID: 0 PID: 66 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.484945][ T66] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.484963][ T66] Call Trace:
[ 19.484975][ T66] <TASK>
[ 19.484991][ T66] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.485052][ T66] dump_stack (lib/dump_stack.c:130)
[ 19.485092][ T66] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.485139][ T66] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.485176][ T66] task_cache_work (kernel/sched/fair.c:1422)
[ 19.485202][ T66] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.485264][ T66] ? lock_is_held (include/linux/lockdep.h:249)
[ 19.485307][ T66] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.485357][ T66] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.485384][ T66] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.485418][ T66] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.485468][ T66] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.485513][ T66] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.485550][ T66] ? preempt_latency_start (include/linux/ftrace.h:1091 kernel/sched/core.c:5866)
[ 19.485607][ T66] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.485660][ T66] exit_to_user_mode_loop (kernel/entry/common.c:124)
[ 19.485700][ T66] do_int80_emulation (include/linux/entry-common.h:332 include/linux/entry-common.h:414 include/linux/entry-common.h:449 arch/x86/entry/syscall_32.c:175)
[ 19.485758][ T66] ? __lock_acquire (kernel/locking/lockdep.c:5240)
[ 19.485821][ T66] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.485871][ T66] ? vtime_user_exit (kernel/sched/cputime.c:737)
[ 19.485924][ T66] ? vtime_user_exit (kernel/sched/cputime.c:737)
[ 19.485976][ T66] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.486035][ T66] ? debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.486070][ T66] ? rcu_is_watching (include/linux/context_tracking.h:128 kernel/rcu/tree.c:745)
[ 19.486111][ T66] ? trace_irq_disable (include/trace/events/preemptirq.h:36 (discriminator 21))
[ 19.486159][ T66] ? trace_hardirqs_off_finish (kernel/trace/trace_preemptirq.c:98)
[ 19.486198][ T66] ? do_int80_emulation (arch/x86/include/asm/jump_label.h:36 arch/x86/entry/syscall_32.c:148)
[ 19.486244][ T66] asm_int80_emulation (arch/x86/include/asm/idtentry.h:626)
[ 19.486274][ T66] RIP: 0023:0xf7f82cb0
[ 19.486300][ T66] Code: 4c 24 34 89 44 24 0c 8b 44 24 44 8b 54 24 38 8b 74 24 3c 8b 7c 24 40 a9 ff 0f 00 00 75 1c c1 e8 0c 89 c5 b8 c0 00 00 00 cd 80 <3d> 00 f0 ff ff 77 21 83 c4 1c 5b 5e 5f 5d c3 90 83 c4 1c b8 ea ff
All code
========
0: 4c 24 34 rex.WR and $0x34,%al
3: 89 44 24 0c mov %eax,0xc(%rsp)
7: 8b 44 24 44 mov 0x44(%rsp),%eax
b: 8b 54 24 38 mov 0x38(%rsp),%edx
f: 8b 74 24 3c mov 0x3c(%rsp),%esi
13: 8b 7c 24 40 mov 0x40(%rsp),%edi
17: a9 ff 0f 00 00 test $0xfff,%eax
1c: 75 1c jne 0x3a
1e: c1 e8 0c shr $0xc,%eax
21: 89 c5 mov %eax,%ebp
23: b8 c0 00 00 00 mov $0xc0,%eax
28: cd 80 int $0x80
2a:* 3d 00 f0 ff ff cmp $0xfffff000,%eax <-- trapping instruction
2f: 77 21 ja 0x52
31: 83 c4 1c add $0x1c,%esp
34: 5b pop %rbx
35: 5e pop %rsi
36: 5f pop %rdi
37: 5d pop %rbp
38: c3 ret
39: 90 nop
3a: 83 c4 1c add $0x1c,%esp
3d: b8 .byte 0xb8
3e: ea (bad)
3f: ff .byte 0xff
Code starting with the faulting instruction
===========================================
0: 3d 00 f0 ff ff cmp $0xfffff000,%eax
5: 77 21 ja 0x28
7: 83 c4 1c add $0x1c,%esp
a: 5b pop %rbx
b: 5e pop %rsi
c: 5f pop %rdi
d: 5d pop %rbp
e: c3 ret
f: 90 nop
10: 83 c4 1c add $0x1c,%esp
13: b8 .byte 0xb8
14: ea (bad)
15: ff .byte 0xff
[ 19.486327][ T66] RSP: 002b:00000000ff907830 EFLAGS: 00000246 ORIG_RAX: 00000000000000c0
[ 19.486359][ T66] RAX: 00000000f7f34000 RBX: 0000000000000000 RCX: 000000000002b148
[ 19.486380][ T66] RDX: 0000000000000001 RSI: 0000000000000802 RDI: 0000000000000000
[ 19.486399][ T66] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 19.486418][ T66] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.486437][ T66] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.486519][ T66] </TASK>
[ 19.544246][ T66] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/66
[ 19.545273][ T66] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.545971][ T66] CPU: 1 UID: 0 PID: 66 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
[ 19.545981][ T66] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 19.545985][ T66] Call Trace:
[ 19.545988][ T66] <TASK>
[ 19.545992][ T66] dump_stack_lvl (lib/dump_stack.c:123)
[ 19.546007][ T66] dump_stack (lib/dump_stack.c:130)
[ 19.546016][ T66] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
[ 19.546027][ T66] debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.546035][ T66] task_cache_work (kernel/sched/fair.c:1422)
[ 19.546046][ T66] ? find_held_lock (kernel/locking/lockdep.c:5353)
[ 19.546060][ T66] ? _raw_spin_unlock_irq (arch/x86/include/asm/paravirt.h:671 include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[ 19.546072][ T66] ? __pfx_task_cache_work (kernel/sched/fair.c:1416)
[ 19.546078][ T66] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 19.546086][ T66] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475)
[ 19.546098][ T66] task_work_run (kernel/task_work.c:228 (discriminator 1))
[ 19.546108][ T66] ? __pfx_task_work_run (kernel/task_work.c:195)
[ 19.546122][ T66] resume_user_mode_work (arch/x86/include/asm/current.h:25 include/linux/resume_user_mode.h:53)
[ 19.546135][ T66] exit_to_user_mode_loop (kernel/entry/common.c:124)
[ 19.546144][ T66] do_int80_emulation (include/linux/entry-common.h:332 include/linux/entry-common.h:414 include/linux/entry-common.h:449 arch/x86/entry/syscall_32.c:175)
[ 19.546155][ T66] ? debug_smp_processor_id (lib/smp_processor_id.c:61)
[ 19.546163][ T66] ? rcu_is_watching (include/linux/context_tracking.h:128 kernel/rcu/tree.c:745)
[ 19.546173][ T66] ? trace_irq_disable (include/trace/events/preemptirq.h:36 (discriminator 21))
[ 19.546184][ T66] ? trace_hardirqs_off_finish (kernel/trace/trace_preemptirq.c:98)
[ 19.546193][ T66] ? do_int80_emulation (arch/x86/include/asm/jump_label.h:36 arch/x86/entry/syscall_32.c:148)
[ 19.546203][ T66] asm_int80_emulation (arch/x86/include/asm/idtentry.h:626)
[ 19.546211][ T66] RIP: 0023:0xf7f82cb0
[ 19.546218][ T66] Code: 4c 24 34 89 44 24 0c 8b 44 24 44 8b 54 24 38 8b 74 24 3c 8b 7c 24 40 a9 ff 0f 00 00 75 1c c1 e8 0c 89 c5 b8 c0 00 00 00 cd 80 <3d> 00 f0 ff ff 77 21 83 c4 1c 5b 5e 5f 5d c3 90 83 c4 1c b8 ea ff
All code
========
0: 4c 24 34 rex.WR and $0x34,%al
3: 89 44 24 0c mov %eax,0xc(%rsp)
7: 8b 44 24 44 mov 0x44(%rsp),%eax
b: 8b 54 24 38 mov 0x38(%rsp),%edx
f: 8b 74 24 3c mov 0x3c(%rsp),%esi
13: 8b 7c 24 40 mov 0x40(%rsp),%edi
17: a9 ff 0f 00 00 test $0xfff,%eax
1c: 75 1c jne 0x3a
1e: c1 e8 0c shr $0xc,%eax
21: 89 c5 mov %eax,%ebp
23: b8 c0 00 00 00 mov $0xc0,%eax
28: cd 80 int $0x80
2a:* 3d 00 f0 ff ff cmp $0xfffff000,%eax <-- trapping instruction
2f: 77 21 ja 0x52
31: 83 c4 1c add $0x1c,%esp
34: 5b pop %rbx
35: 5e pop %rsi
36: 5f pop %rdi
37: 5d pop %rbp
38: c3 ret
39: 90 nop
3a: 83 c4 1c add $0x1c,%esp
3d: b8 .byte 0xb8
3e: ea (bad)
3f: ff .byte 0xff
Code starting with the faulting instruction
===========================================
0: 3d 00 f0 ff ff cmp $0xfffff000,%eax
5: 77 21 ja 0x28
7: 83 c4 1c add $0x1c,%esp
a: 5b pop %rbx
b: 5e pop %rsi
c: 5f pop %rdi
d: 5d pop %rbp
e: c3 ret
f: 90 nop
10: 83 c4 1c add $0x1c,%esp
13: b8 .byte 0xb8
14: ea (bad)
15: ff .byte 0xff
[ 19.546225][ T66] RSP: 002b:00000000ff907810 EFLAGS: 00000246 ORIG_RAX: 00000000000000c0
[ 19.546233][ T66] RAX: 00000000f7c6b000 RBX: 0000000000000000 RCX: 00000000002c8ae0
[ 19.546238][ T66] RDX: 0000000000000001 RSI: 0000000000000802 RDI: 0000000000000000
[ 19.546243][ T66] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 19.546247][ T66] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 19.546252][ T66] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 19.546269][ T66] </TASK>
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250812/202508120315.19f6266a-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
On 8/12/2025 9:59 AM, kernel test robot wrote: > > > [ 19.177186][ T64] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/64 > [ 19.179622][ T64] caller is debug_smp_processor_id (lib/smp_processor_id.c:61) > [ 19.181347][ T64] CPU: 0 UID: 0 PID: 64 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none) > [ 19.181372][ T64] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > [ 19.181385][ T64] Call Trace: > [ 19.181391][ T64] <TASK> > [ 19.181401][ T64] dump_stack_lvl (lib/dump_stack.c:123) > [ 19.181440][ T64] dump_stack (lib/dump_stack.c:130) > [ 19.181465][ T64] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53) > [ 19.181494][ T64] debug_smp_processor_id (lib/smp_processor_id.c:61) > [ 19.181514][ T64] task_cache_work (kernel/sched/fair.c:1422) Thanks for the report, will use get_cpu() in next version. thanks, Chenyu
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