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X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR11MB8105 X-OriginatorOrg: intel.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hello, by this commit, we see the config has below diff: --- /pkg/linux/x86_64-randconfig-161-20241120/gcc-12/35772d627b55cc7fb4f33b= ae57c564a25b3121a9/.config 2024-11-22 17:03:32.458344665 +0800 +++ /pkg/linux/x86_64-randconfig-161-20241120/gcc-12/476e8583ca16eecec0a3a2= 8b6ee7130f4e369389/.config 2024-11-22 17:02:59.440805587 +0800 @@ -121,9 +121,11 @@ CONFIG_BPF_UNPRIV_DEFAULT_OFF=3Dy # end of BPF subsystem CONFIG_PREEMPT_BUILD=3Dy -CONFIG_PREEMPT_NONE=3Dy +CONFIG_ARCH_HAS_PREEMPT_LAZY=3Dy +# CONFIG_PREEMPT_NONE is not set # CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT is not set +CONFIG_PREEMPT_LAZY=3Dy # CONFIG_PREEMPT_RT is not set CONFIG_PREEMPT_COUNT=3Dy CONFIG_PREEMPTION=3Dy and we observed the issue does not always happen, but with high rate: 35772d627b55cc7f 476e8583ca16eecec0a3a28b6ee ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :47 70% 33:48 dmesg.RIP:torture_sched_setaf= finity :47 70% 33:48 dmesg.WARNING:at_kernel/rcu/u= pdate.c:#torture_sched_setaffinity below is full report FYI. kernel test robot noticed "WARNING:at_kernel/rcu/update.c:#torture_sched_se= taffinity" on: commit: 476e8583ca16eecec0a3a28b6ee7130f4e369389 ("sched, x86: Enable Lazy = preemption") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [test failed on linus/master fc39fb56917bb3cb53e99560ca3612a84456ada2] [test failed on linux-next/master decc701f41d07481893fdea942c0ac6b226e84cd] in testcase: rcutorture version:=20 with following parameters: runtime: 300s test: cpuhotplug torture_type: trivial config: x86_64-randconfig-161-20241120 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) If you fix the issue in a separate patch/commit (i.e. not just a new versio= n of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202411252253.e39d77c6-lkp@intel.com [ 150.797530][ T445] ------------[ cut here ]------------ [ 150.797915][ T445] torture_sched_setaffinity: sched_setaffinity(445) re= turned -22 [ 150.798353][ T445] WARNING: CPU: 0 PID: 445 at kernel/rcu/update.c:535 to= rture_sched_setaffinity (kernel/rcu/update.c:535 (discriminator 3))=20 [ 150.798909][ T445] Modules linked in: rcutorture torture ipmi_devintf i= pmi_msghandler joydev crc32c_intel polyval_clmulni sha512_ssse3 sha256_ssse= 3 psmouse pcspkr input_leds led_class evdev drm drm_panel_orientation_quirk= s efi_pstore i2c_core dmi_sysfs qemu_fw_cfg aesni_intel nhc_udp nhc_routing= nhc_mobility nhc_hop nhc_fragment nhc_dest [ 150.800845][ T445] CPU: 0 UID: 0 PID: 445 Comm: rcu_torture_wri Tainted= : G W 6.12.0-rc4-00032-g476e8583ca16 #1 2d4e54818569ec14d78= 68b657e3682f49dc47408 [ 150.801671][ T445] Tainted: [W]=3DWARN [ 150.801886][ T445] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996= ), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 150.802444][ T445] RIP: 0010:torture_sched_setaffinity (kernel/rcu/update= .c:535 (discriminator 3))=20 [ 150.802909][ T445] Code: 11 06 00 75 e7 89 c1 48 89 45 f0 c6 05 9e 73 11 = 06 01 90 48 c7 c6 a0 07 0e 85 44 89 e2 48 c7 c7 00 d9 0d 85 e8 88 86 e0 ff = 90 <0f> 0b 90 90 48 8b 45 f0 4c 8b 65 f8 c9 48 98 31 d2 31 c9 31 f6 31 All code =3D=3D=3D=3D=3D=3D=3D=3D 0: 11 06 adc %eax,(%rsi) 2: 00 75 e7 add %dh,-0x19(%rbp) 5: 89 c1 mov %eax,%ecx 7: 48 89 45 f0 mov %rax,-0x10(%rbp) b: c6 05 9e 73 11 06 01 movb $0x1,0x611739e(%rip) # 0x61173b0 12: 90 nop 13: 48 c7 c6 a0 07 0e 85 mov $0xffffffff850e07a0,%rsi 1a: 44 89 e2 mov %r12d,%edx 1d: 48 c7 c7 00 d9 0d 85 mov $0xffffffff850dd900,%rdi 24: e8 88 86 e0 ff call 0xffffffffffe086b1 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 90 nop 2d: 90 nop 2e: 48 8b 45 f0 mov -0x10(%rbp),%rax 32: 4c 8b 65 f8 mov -0x8(%rbp),%r12 36: c9 leave 37: 48 98 cltq 39: 31 d2 xor %edx,%edx 3b: 31 c9 xor %ecx,%ecx 3d: 31 f6 xor %esi,%esi 3f: 31 .byte 0x31 Code starting with the faulting instruction =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 0: 0f 0b ud2 2: 90 nop 3: 90 nop 4: 48 8b 45 f0 mov -0x10(%rbp),%rax 8: 4c 8b 65 f8 mov -0x8(%rbp),%r12 c: c9 leave d: 48 98 cltq f: 31 d2 xor %edx,%edx 11: 31 c9 xor %ecx,%ecx 13: 31 f6 xor %esi,%esi 15: 31 .byte 0x31 [ 150.803951][ T445] RSP: 0018:ffffc90001d0fc50 EFLAGS: 00010246 [ 150.804295][ T445] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000= 0000000000000 [ 150.804738][ T445] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000= 0000000000000 [ 150.805173][ T445] RBP: ffffc90001d0fc60 R08: 0000000000000000 R09: 000= 0000000000000 [ 150.805664][ T445] R10: 0000000000000000 R11: 0000000000000000 R12: 000= 00000000001bd [ 150.806126][ T445] R13: ffffed10298bc638 R14: dffffc0000000000 R15: fff= f88814c5e2c00 [ 150.806567][ T445] FS: 0000000000000000(0000) GS:ffff8883aee00000(0000= ) knlGS:0000000000000000 [ 150.807061][ T445] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 150.807425][ T445] CR2: 00007fd03312b000 CR3: 0000000101aa7000 CR4: 000= 00000000406f0 [ 150.807863][ T445] Call Trace: [ 150.808055][ T445] [ 150.808230][ T445] ? show_regs (arch/x86/kernel/dumpstack.c:479)=20 [ 150.808482][ T445] ? __warn (kernel/panic.c:748)=20 [ 150.808722][ T445] ? torture_sched_setaffinity (kernel/rcu/update.c:535 (= discriminator 3))=20 [ 150.809050][ T445] ? report_bug (lib/bug.c:180 lib/bug.c:219)=20 [ 150.809325][ T445] ? handle_bug (arch/x86/kernel/traps.c:285)=20 [ 150.809631][ T445] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discrim= inator 1))=20 [ 150.809907][ T445] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:= 621)=20 [ 150.810206][ T445] ? torture_sched_setaffinity (kernel/rcu/update.c:535 (= discriminator 3))=20 [ 150.810536][ T445] synchronize_rcu_trivial (kernel/rcu/rcutorture.c:837) = rcutorture [ 150.811100][ T445] ? debug_smp_processor_id (lib/smp_processor_id.c:61)=20 [ 150.811407][ T445] ? rcu_torture_read_exit (kernel/rcu/rcutorture.c:832) = rcutorture [ 150.811996][ T445] do_rtws_sync+0x395/0x6e0 rcutorture [ 150.812579][ T445] ? srcu_read_delay (kernel/rcu/rcutorture.c:1328) rcuto= rture [ 150.813133][ T445] ? preempt_count_sub (kernel/sched/core.c:5867 kernel/s= ched/core.c:5863 kernel/sched/core.c:5885)=20 [ 150.813443][ T445] ? delay_tsc (arch/x86/include/asm/preempt.h:103 arch/x= 86/lib/delay.c:96)=20 [ 150.813697][ T445] rcu_torture_writer (kernel/rcu/rcutorture.c:1578) rcut= orture [ 150.814240][ T445] ? __kthread_parkme (include/linux/instrumented.h:68 in= clude/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:280= )=20 [ 150.814524][ T445] ? reacquire_held_locks (kernel/locking/lockdep.c:5476)=20 [ 150.814841][ T445] ? rcu_torture_fwd_prog_cr (kernel/rcu/rcutorture.c:136= 4) rcutorture [ 150.815419][ T445] ? _raw_spin_unlock_irqrestore (arch/x86/include/asm/pr= eempt.h:103 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:= 194)=20 [ 150.815756][ T445] ? __kthread_parkme (include/linux/instrumented.h:68 in= clude/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:280= )=20 [ 150.816076][ T445] ? __kasan_check_read (mm/kasan/shadow.c:32)=20 [ 150.816368][ T445] ? __kthread_parkme (arch/x86/include/asm/bitops.h:206 = arch/x86/include/asm/bitops.h:238 include/asm-generic/bitops/instrumented-n= on-atomic.h:142 kernel/kthread.c:280)=20 [ 150.816648][ T445] ? trace_preempt_on (kernel/trace/trace_preemptirq.c:10= 5)=20 [ 150.816936][ T445] ? rcu_torture_fwd_prog_cr (kernel/rcu/rcutorture.c:136= 4) rcutorture [ 150.817541][ T445] kthread (kernel/kthread.c:389)=20 [ 150.817780][ T445] ? trace_sched_kthread_stop_ret (kernel/kthread.c:342)=20 [ 150.818127][ T445] ret_from_fork (arch/x86/kernel/process.c:153)=20 [ 150.818382][ T445] ? trace_sched_kthread_stop_ret (kernel/kthread.c:342)=20 [ 150.818730][ T445] ret_from_fork_asm (arch/x86/entry/entry_64.S:254)=20 [ 150.819022][ T445] [ 150.819201][ T445] irq event stamp: 230151 [ 150.819484][ T445] hardirqs last enabled at (230163): __up_console_sem (a= rch/x86/include/asm/irqflags.h:42 (discriminator 1) arch/x86/include/asm/ir= qflags.h:97 (discriminator 1) arch/x86/include/asm/irqflags.h:155 (discrimi= nator 1) kernel/printk/printk.c:344 (discriminator 1))=20 [ 150.820008][ T445] hardirqs last disabled at (230172): __up_console_sem (= kernel/printk/printk.c:342 (discriminator 1))=20 [ 150.820529][ T445] softirqs last enabled at (229700): handle_softirqs (ar= ch/x86/include/asm/preempt.h:26 kernel/softirq.c:401 kernel/softirq.c:582)=20 [ 150.821054][ T445] softirqs last disabled at (229651): irq_exit_rcu (kern= el/softirq.c:589 kernel/softirq.c:428 kernel/softirq.c:637 kernel/softirq.c= :627 kernel/softirq.c:649)=20 [ 150.821585][ T445] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20241125/202411252253.e39d77c6-lkp@= intel.com --=20 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki