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X-OriginatorOrg: intel.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hello, this report is just FYI. as we understand, this is a debug patch. and by it, we notice below config = diff: --- /pkg/linux/x86_64-randconfig-161-20260529/gcc-14/e66d61ddb1d8504e4bfd3d= cc3fa26293f9d14d9d/.config 2026-05-30 00:10:22.784053022 +0800 +++ /pkg/linux/x86_64-randconfig-161-20260529/gcc-14/888c290a0240da1ce1a4d6= 9beafe44f9abec93c0/.config 2026-05-29 23:38:02.317371800 +0800 @@ -97,6 +97,7 @@ CONFIG_HRTIMER_REARM_DEFERRED=3Dy CONFIG_HAVE_POSIX_CPU_TIMERS_TASK_WORK=3Dy CONFIG_POSIX_CPU_TIMERS_TASK_WORK=3Dy CONFIG_CONTEXT_TRACKING=3Dy +CONFIG_CONTEXT_TRACKING_IDLE=3Dy # # Timers subsystem @@ -129,7 +130,8 @@ CONFIG_PREEMPT_BUILD=3Dy CONFIG_ARCH_HAS_PREEMPT_LAZY=3Dy # CONFIG_PREEMPT is not set CONFIG_PREEMPT_LAZY=3Dy -# CONFIG_PREEMPT_RT is not set +CONFIG_PREEMPT_RT=3Dy +CONFIG_PREEMPT_RT_NEEDS_BH_LOCK=3Dy CONFIG_PREEMPT_COUNT=3Dy CONFIG_PREEMPTION=3Dy # CONFIG_PREEMPT_DYNAMIC is not set @@ -150,9 +152,11 @@ CONFIG_PSI=3Dy # # RCU Subsystem # -CONFIG_TINY_RCU=3Dy +CONFIG_TREE_RCU=3Dy +CONFIG_PREEMPT_RCU=3Dy CONFIG_RCU_EXPERT=3Dy -CONFIG_TINY_SRCU=3Dy +CONFIG_TREE_SRCU=3Dy +# CONFIG_FORCE_NEED_SRCU_NMI_SAFE is not set CONFIG_TASKS_RCU_GENERIC=3Dy CONFIG_FORCE_TASKS_RCU=3Dy CONFIG_NEED_TASKS_RCU=3Dy @@ -162,7 +166,18 @@ CONFIG_TASKS_RUDE_RCU=3Dy CONFIG_FORCE_TASKS_TRACE_RCU=3Dy CONFIG_TASKS_TRACE_RCU=3Dy CONFIG_TASKS_TRACE_RCU_NO_MB=3Dy +CONFIG_RCU_STALL_COMMON=3Dy CONFIG_RCU_NEED_SEGCBLIST=3Dy +CONFIG_RCU_FANOUT=3D64 +CONFIG_RCU_FANOUT_LEAF=3D2 +CONFIG_RCU_BOOST=3Dy +CONFIG_RCU_BOOST_DELAY=3D500 +CONFIG_RCU_EXP_KTHREAD=3Dy +CONFIG_RCU_NOCB_CPU=3Dy +# CONFIG_RCU_NOCB_CPU_DEFAULT_ALL is not set +# CONFIG_RCU_NOCB_CPU_CB_BOOST is not set +CONFIG_RCU_LAZY=3Dy +# CONFIG_RCU_LAZY_DEFAULT_OFF is not set # CONFIG_RCU_DOUBLE_CHECK_CB_TIME is not set # end of RCU Subsystem @@ -176,7 +191,6 @@ CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=3Dy # # Scheduler features # -# CONFIG_SCHED_PROXY_EXEC is not set # end of Scheduler features CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=3Dy @@ -772,7 +786,6 @@ CONFIG_MODULES_USE_ELF_RELA=3Dy CONFIG_ARCH_HAS_EXECMEM_ROX=3Dy CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK=3Dy CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK=3Dy -CONFIG_SOFTIRQ_ON_OWN_STACK=3Dy CONFIG_ARCH_HAS_ELF_RANDOMIZE=3Dy CONFIG_HAVE_ARCH_MMAP_RND_BITS=3Dy CONFIG_HAVE_EXIT_THREAD=3Dy @@ -974,7 +987,6 @@ CONFIG_MMU_NOTIFIER=3Dy CONFIG_DEFAULT_MMAP_MIN_ADDR=3D4096 CONFIG_ARCH_WANT_GENERAL_HUGETLB=3Dy CONFIG_ARCH_WANTS_THP_SWAP=3Dy -# CONFIG_TRANSPARENT_HUGEPAGE is not set CONFIG_PAGE_MAPCOUNT=3Dy CONFIG_PGTABLE_HAS_HUGE_LEAVES=3Dy CONFIG_HAVE_GIGANTIC_FOLIOS=3Dy @@ -4202,9 +4214,9 @@ CONFIG_DRM_ETNAVIV_THERMAL=3Dy # CONFIG_DRM_GMA500 is not set CONFIG_DRM_GUD=3Dy CONFIG_DRM_HISI_HIBMC=3Dy -# CONFIG_DRM_I915 is not set # CONFIG_DRM_LOGICVC is not set CONFIG_DRM_MGAG200=3Dy +CONFIG_DRM_MGAG200_DISABLE_WRITECOMBINE=3Dy CONFIG_DRM_NOUVEAU=3Dy CONFIG_NOUVEAU_DEBUG=3D5 CONFIG_NOUVEAU_DEBUG_DEFAULT=3D3 @@ -4895,7 +4907,6 @@ CONFIG_LEDS_TRIGGER_DISK=3Dy CONFIG_LEDS_TRIGGER_MTD=3Dy CONFIG_LEDS_TRIGGER_HEARTBEAT=3Dy CONFIG_LEDS_TRIGGER_BACKLIGHT=3Dy -# CONFIG_LEDS_TRIGGER_CPU is not set CONFIG_LEDS_TRIGGER_ACTIVITY=3Dy CONFIG_LEDS_TRIGGER_GPIO=3Dy CONFIG_LEDS_TRIGGER_DEFAULT_ON=3Dy @@ -7388,7 +7399,6 @@ CONFIG_HARDLOCKUP_CHECK_TIMESTAMP=3Dy CONFIG_DETECT_HUNG_TASK=3Dy CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=3D480 CONFIG_BOOTPARAM_HUNG_TASK_PANIC=3D0 -CONFIG_DETECT_HUNG_TASK_BLOCKER=3Dy CONFIG_WQ_WATCHDOG=3Dy CONFIG_BOOTPARAM_WQ_STALL_PANIC=3D0 # CONFIG_WQ_CPU_INTENSIVE_REPORT is not set @@ -7415,9 +7425,7 @@ CONFIG_PROVE_RAW_LOCK_NESTING=3Dy # CONFIG_LOCK_STAT is not set CONFIG_DEBUG_RT_MUTEXES=3Dy CONFIG_DEBUG_SPINLOCK=3Dy -CONFIG_DEBUG_MUTEXES=3Dy CONFIG_DEBUG_WW_MUTEX_SLOWPATH=3Dy -CONFIG_DEBUG_RWSEMS=3Dy CONFIG_DEBUG_LOCK_ALLOC=3Dy CONFIG_LOCKDEP=3Dy CONFIG_LOCKDEP_BITS=3D15 @@ -7463,8 +7471,13 @@ CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=3Dy # CONFIG_RCU_TORTURE_TEST_LOG_CPU is not set CONFIG_RCU_TORTURE_TEST_LOG_GP=3Dy CONFIG_RCU_REF_SCALE_TEST=3Dm +CONFIG_RCU_CPU_STALL_TIMEOUT=3D21 +CONFIG_RCU_EXP_CPU_STALL_TIMEOUT=3D0 +CONFIG_RCU_CPU_STALL_CPUTIME=3Dy +CONFIG_RCU_CPU_STALL_NOTIFIER=3Dy CONFIG_RCU_TRACE=3Dy CONFIG_RCU_EQS_DEBUG=3Dy +CONFIG_RCU_STRICT_GRACE_PERIOD=3Dy # CONFIG_RCU_DYNTICKS_TORTURE is not set # CONFIG_TRIVIAL_PREEMPT_RCU is not set # end of RCU Debugging then we notice issues as below full report. just FYI what we observed in our tests. kernel test robot noticed "BUG:MAX_LOCKDEP_CHAINS_too_low" on: commit: 888c290a0240da1ce1a4d69beafe44f9abec93c0 ("lib/Kconfig.debug: enabl= e CONFIG_PREEMPT_RT for syzbot kernels.") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master [test failed on linux-next/master f7af91adc230aa99e23330ecf85bc9badd9780ad] in testcase: trinity version: trinity-i386-abe9de86-1_20230429 with following parameters: runtime: 300s group: group-04 nr_groups: 5 config: x86_64-randconfig-161-20260529 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (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/202605311625.72d32001-lkp@intel.com [ 467.321357][ T4078] BUG: MAX_LOCKDEP_CHAINS too low! [ 467.321374][ T4078] turning off the locking correctness validator. [ 467.321400][ T4078] CPU: 0 UID: 65534 PID: 4078 Comm: trinity-main Taint= ed: G T 7.1.0-rc5-00005-g888c290a0240 #1 PREEMPT_{RT,LAZY} [ 467.321419][ T4078] Tainted: [T]=3DRANDSTRUCT [ 467.321431][ T4078] Call Trace: [ 467.321436][ T4078] [ 467.321443][ T4078] dump_stack_lvl (dump_stack.c:94 dump_stack.c:120) [ 467.321482][ T4078] dump_stack (dump_stack.c:129) [ 467.321492][ T4078] add_chain_cache (locking/lockdep.c:3755) [ 467.321512][ T4078] validate_chain (locking/lockdep.c:3857 locking/lock= dep.c:3878) [ 467.321526][ T4078] __lock_acquire (locking/lockdep.c:5239) [ 467.321539][ T4078] ? lock_hrtimer_base+0x32/0x80 [ 467.321552][ T4078] lock_acquire (locking/lockdep.c:5870) [ 467.321561][ T4078] ? lock_hrtimer_base+0x32/0x80 [ 467.321574][ T4078] ? __lock_acquire (locking/lockdep.c:5239) [ 467.321588][ T4078] _raw_spin_lock_irqsave (linux/spinlock_api_smp.h:13= 2 (discriminator 1) locking/spinlock.c:166 (discriminator 1)) [ 467.321609][ T4078] ? lock_hrtimer_base+0x32/0x80 [ 467.321621][ T4078] lock_hrtimer_base+0x32/0x80 [ 467.321633][ T4078] hrtimer_start_range_ns (time/hrtimer.c:1489) [ 467.321645][ T4078] ? __hrtimer_start_range_ns (time/hrtimer.c:1460) [ 467.321658][ T4078] ? kvm_clock_read (x86/kernel/kvmclock.c:80 (discrim= inator 1)) [ 467.321672][ T4078] hrtick_cond_restart (linux/hrtimer.h:220 sched/core= .c:924) [ 467.321684][ T4078] hrtick_schedule_exit+0x2c/0x80 [ 467.321695][ T4078] finish_task_switch+0x38f/0x540 [ 467.321708][ T4078] ? finish_task_switch+0x376/0x540 [ 467.321723][ T4078] __schedule (sched/core.c:5391 sched/core.c:7189) [ 467.321738][ T4078] ? io_schedule_timeout (sched/core.c:8102) [ 467.321753][ T4078] ? might_alloc (linux/sched/mm.h:317) [ 467.321766][ T4078] preempt_schedule_notrace (sched/core.c:7463) [ 467.321779][ T4078] preempt_schedule_notrace_thunk (x86/entry/thunk.S:1= 3) [ 467.321795][ T4078] rcu_is_watching (rcu/tree.c:753 (discriminator 1)) [ 467.321807][ T4078] lock_acquire (trace/events/lock.h:24 (discriminator= 11) locking/lockdep.c:5833 (discriminator 11)) [ 467.321817][ T4078] ? kernfs_fop_open (kernfs/file.c:619) [ 467.321828][ T4078] ? lock_acquire (locking/lockdep.c:5870) [ 467.321837][ T4078] ? kernfs_fop_open (linux/slab.h:950 linux/slab.h:11= 88 kernfs/file.c:641) [ 467.321846][ T4078] __fs_reclaim_acquire (page_alloc.c:4325) [ 467.321857][ T4078] ? might_alloc (linux/sched/mm.h:317) [ 467.321867][ T4078] fs_reclaim_acquire (page_alloc.c:4339 (discriminato= r 1)) [ 467.321877][ T4078] might_alloc (linux/sched/mm.h:317) [ 467.321887][ T4078] __kmalloc_cache_noprof (slub.c:4521 slub.c:4876 slu= b.c:5415) [ 467.321902][ T4078] kernfs_fop_open (linux/slab.h:950 linux/slab.h:1188= kernfs/file.c:641) [ 467.321916][ T4078] ? kernfs_fop_release (kernfs/file.c:789) [ 467.321924][ T4078] do_dentry_open (open.c:947) [ 467.321941][ T4078] vfs_open (open.c:1079) [ 467.321952][ T4078] do_open (namei.c:4699) [ 467.321969][ T4078] path_openat (namei.c:4858) [ 467.321980][ T4078] ? kernel_tmpfile_open (namei.c:4800) [ 467.321992][ T4078] ? rt_mutex_slowunlock (locking/rtmutex.c:350 lockin= g/rtmutex.c:1463) [ 467.322007][ T4078] do_file_open (namei.c:4887) [ 467.322018][ T4078] ? path_openat (namei.c:4875) [ 467.322032][ T4078] ? mark_wakeup_next_waiter (locking/rtmutex.c:1364) [ 467.322063][ T4078] do_sys_openat2 (open.c:1364 (discriminator 1)) [ 467.322075][ T4078] ? file_open_root (open.c:1352) [ 467.322090][ T4078] ? __lock_acquire (locking/lockdep.c:5239) [ 467.322102][ T4078] do_sys_open (open.c:1370) [ 467.322113][ T4078] ? filp_open (open.c:1340) [ 467.322124][ T4078] ? vtime_user_exit (sched/cputime.c:743 (discriminat= or 1)) [ 467.322136][ T4078] ? __lock_release+0x4e/0x140 [ 467.322149][ T4078] __ia32_compat_sys_openat (open.c:1432 open.c:1430 o= pen.c:1430) [ 467.322162][ T4078] ia32_sys_call (kbuild/obj/consumer/x86_64-randconfi= g-161-20260529/./arch/x86/include/generated/asm/syscalls_32.h:296) [ 467.322174][ T4078] __do_fast_syscall_32 (x86/entry/syscall_32.c:83 x86= /entry/syscall_32.c:307) [ 467.322186][ T4078] ? preempt_latency_start (linux/ftrace.h:1168 sched/= core.c:5837) [ 467.322198][ T4078] ? __do_fast_syscall_32 (linux/randomize_kstack.h:58= x86/entry/syscall_32.c:279) [ 467.322210][ T4078] do_fast_syscall_32 (x86/entry/syscall_32.c:332) [ 467.322220][ T4078] do_SYSENTER_32 (x86/entry/syscall_32.c:370) [ 467.322229][ T4078] entry_SYSENTER_compat_after_hwframe (x86/entry/entr= y_64_compat.S:126) [ 467.322241][ T4078] RIP: 0023:0xf7fb938c [ 467.322252][ T4078] Code: d2 74 05 c1 e8 0c 89 02 8b 5d fc 31 c0 c9 31 d= 2 31 c9 c3 cc 90 90 90 90 90 90 90 90 90 90 0f 1f 00 51 52 55 89 e5 0f 34 c= d 80 <5d> 5a 59 c3 cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 All code =3D=3D=3D=3D=3D=3D=3D=3D 0: d2 74 05 c1 shlb %cl,-0x3f(%rbp,%rax,1) 4: e8 0c 89 02 8b call 0xffffffff8b028915 9: 5d pop %rbp a: fc cld b: 31 c0 xor %eax,%eax d: c9 leave e: 31 d2 xor %edx,%edx 10: 31 c9 xor %ecx,%ecx 12: c3 ret 13: cc int3 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 0f 1f 00 nopl (%rax) 21: 51 push %rcx 22: 52 push %rdx 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 2a:* 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: cc int3 2f: 90 nop 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop 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: 5d pop %rbp 1: 5a pop %rdx 2: 59 pop %rcx 3: c3 ret 4: cc int3 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260531/202605311625.72d32001-lkp@= intel.com --=20 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki