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[ 157.881467][T11003] [ 157.881467][T11003] other info that might help us debug this: [ 157.881467][T11003] [ 157.894190][T11003] [ 157.894190][T11003] rcu_scheduler_active = 2, debug_locks = 1 [ 157.903901][T11003] no locks held by xz/11003. [ 157.909285][T11003] [ 157.909285][T11003] stack backtrace: [ 157.916841][T11003] CPU: 2 UID: 0 PID: 11003 Comm: xz Tainted: G S 6.18.0-rc5-00346-g7f634b9540f8 #1 PREEMPT(full) [ 157.916846][T11003] Tainted: [S]=CPU_OUT_OF_SPEC [ 157.916848][T11003] Hardware name: Intel Corporation Mehlow UP Server Platform/Moss Beach Server, BIOS CNLSE2R1.R00.X188.B13.1903250419 03/25/2019 [ 157.916850][T11003] Call Trace: [ 157.916852][T11003] [ 157.916855][T11003] dump_stack_lvl (lib/dump_stack.c:122) [ 157.916862][T11003] lockdep_rcu_suspicious.cold (kernel/locking/lockdep.c:6877) [ 157.916868][T11003] nfs4_get_valid_delegation (fs/nfs/delegation.c:103 (discriminator 9)) nfsv4 [ 157.917012][T11003] ? __pfx_nfs4_get_valid_delegation (fs/nfs/delegation.c:100) nfsv4 [ 157.917153][T11003] _nfs4_do_open+0x155/0x720 nfsv4 [ 157.917329][T11003] ? __pfx__nfs4_do_open+0x10/0x10 nfsv4 [ 157.917461][T11003] ? kasan_save_stack (mm/kasan/common.c:58) [ 157.917464][T11003] ? kasan_save_stack (mm/kasan/common.c:57) [ 157.917466][T11003] ? kasan_save_track (mm/kasan/common.c:69 (discriminator 1) mm/kasan/common.c:78 (discriminator 1)) [ 157.917469][T11003] ? __kasan_kmalloc (mm/kasan/common.c:400 mm/kasan/common.c:417) [ 157.917473][T11003] ? alloc_nfs_open_context (fs/nfs/inode.c:1212) [ 157.917480][T11003] nfs4_do_open (fs/nfs/nfs4proc.c:3343) nfsv4 [ 157.917611][T11003] ? __pfx_nfs4_do_open (fs/nfs/nfs4proc.c:3325) nfsv4 [ 157.917744][T11003] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1)) [ 157.917748][T11003] ? __memcg_slab_post_alloc_hook (include/linux/rcupdate.h:341 include/linux/rcupdate.h:897 include/linux/percpu-refcount.h:209 include/linux/percpu-refcount.h:222 include/linux/memcontrol.h:780 mm/memcontrol.c:3193) [ 157.917755][T11003] ? __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1)) [ 157.917759][T11003] ? lock_release (kernel/locking/lockdep.c:470 (discriminator 4) kernel/locking/lockdep.c:5891 (discriminator 4) kernel/locking/lockdep.c:5875 (discriminator 4)) [ 157.917762][T11003] ? __rcu_read_unlock (kernel/rcu/tree_plugin.h:441 (discriminator 1)) [ 157.917769][T11003] nfs4_atomic_open (fs/nfs/nfs4proc.c:3919) nfsv4 [ 157.917899][T11003] ? __pfx_nfs4_atomic_open (fs/nfs/nfs4proc.c:3912) nfsv4 [ 157.918029][T11003] ? alloc_nfs_open_context (fs/nfs/inode.c:1215 (discriminator 1)) [ 157.918033][T11003] ? __lock_release+0x5d/0x180 [ 157.918037][T11003] ? rcu_is_watching (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/context_tracking.h:128 kernel/rcu/tree.c:751) [ 157.918041][T11003] ? trace_preempt_on (include/trace/events/preemptirq.h:53 (discriminator 2) kernel/trace/trace_preemptirq.c:120 (discriminator 2)) [ 157.918046][T11003] ? preempt_count_sub (kernel/sched/core.c:5813 kernel/sched/core.c:5809 kernel/sched/core.c:5831) [ 157.918054][T11003] nfs4_file_open (fs/nfs/nfs4file.c:73 (discriminator 1)) nfsv4 [ 157.918193][T11003] ? __pfx_nfs4_file_open (fs/nfs/nfs4file.c:30) nfsv4 [ 157.918368][T11003] ? rcu_is_watching (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/context_tracking.h:128 kernel/rcu/tree.c:751) [ 157.918374][T11003] ? lock_release (kernel/locking/lockdep.c:470 (discriminator 4) kernel/locking/lockdep.c:5891 (discriminator 4) kernel/locking/lockdep.c:5875 (discriminator 4)) [ 157.918378][T11003] ? __bpf_tramp_exit (kernel/bpf/trampoline.c:1052) [ 157.918382][T11003] ? __rcu_read_unlock (kernel/rcu/tree_plugin.h:441 (discriminator 1)) [ 157.918387][T11003] ? bpf_trampoline_6442519885+0x9f/0xf1 [ 157.918390][T11003] ? fsnotify_open_perm_and_set_mode (include/linux/fsnotify_backend.h:579 (discriminator 2) include/linux/fsnotify.h:24 (discriminator 2) fs/notify/fsnotify.c:679 (discriminator 2)) [ 157.918397][T11003] do_dentry_open (fs/open.c:965) [ 157.918402][T11003] ? __pfx_nfs4_file_open (fs/nfs/nfs4file.c:30) nfsv4 [ 157.918540][T11003] vfs_open (fs/open.c:1097) [ 157.918543][T11003] ? security_inode_permission (security/security.c:2363 (discriminator 1)) [ 157.918550][T11003] do_open (fs/nfs/dir.c:2664) [ 157.918556][T11003] path_openat (fs/namei.c:4135) [ 157.918560][T11003] ? __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1)) [ 157.918564][T11003] ? __pfx_path_openat (fs/namei.c:4116) [ 157.918573][T11003] do_filp_open (fs/namei.c:4162 (discriminator 2)) [ 157.918578][T11003] ? __pfx_do_filp_open (fs/namei.c:4155) [ 157.918581][T11003] ? lock_acquire (include/linux/preempt.h:471 (discriminator 2) include/trace/events/lock.h:24 (discriminator 2) include/trace/events/lock.h:24 (discriminator 2) kernel/locking/lockdep.c:5831 (discriminator 2)) [ 157.918591][T11003] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1)) [ 157.918594][T11003] ? alloc_fd (fs/file.c:613) [ 157.918599][T11003] ? alloc_fd (fs/file.c:613) [ 157.918605][T11003] ? preempt_count_sub (kernel/sched/core.c:5813 kernel/sched/core.c:5809 kernel/sched/core.c:5831) [ 157.918609][T11003] ? _raw_spin_unlock (include/linux/spinlock_api_smp.h:143 (discriminator 3) kernel/locking/spinlock.c:186 (discriminator 3)) [ 157.918613][T11003] ? alloc_fd (fs/file.c:613) [ 157.918620][T11003] do_sys_openat2 (fs/open.c:1437) [ 157.918624][T11003] ? __pfx_do_sys_openat2 (fs/open.c:1422) [ 157.918629][T11003] ? preempt_count_sub (kernel/sched/core.c:5813 kernel/sched/core.c:5809 kernel/sched/core.c:5831) [ 157.918633][T11003] ? _raw_spin_unlock_irq (include/linux/spinlock_api_smp.h:160 (discriminator 3) kernel/locking/spinlock.c:202 (discriminator 3)) [ 157.918639][T11003] __x64_sys_openat (fs/open.c:1463) [ 157.918643][T11003] ? __pfx___x64_sys_openat (fs/open.c:1463) [ 157.918648][T11003] ? lock_release (kernel/locking/lockdep.c:470 (discriminator 4) kernel/locking/lockdep.c:5891 (discriminator 4) kernel/locking/lockdep.c:5875 (discriminator 4)) [ 157.918653][T11003] ? do_syscall_64 (arch/x86/include/asm/irqflags.h:42 arch/x86/include/asm/irqflags.h:119 include/linux/entry-common.h:124 arch/x86/entry/syscall_64.c:90) [ 157.918659][T11003] do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) [ 157.918665][T11003] ? __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1)) [ 157.918670][T11003] ? lock_acquire (include/linux/preempt.h:471 (discriminator 2) include/trace/events/lock.h:24 (discriminator 2) include/trace/events/lock.h:24 (discriminator 2) kernel/locking/lockdep.c:5831 (discriminator 2)) [ 157.918676][T11003] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1)) [ 157.918679][T11003] ? __x64_sys_rt_sigprocmask (kernel/signal.c:3340 kernel/signal.c:3318 kernel/signal.c:3318) [ 157.918683][T11003] ? __x64_sys_rt_sigprocmask (kernel/signal.c:3340 kernel/signal.c:3318 kernel/signal.c:3318) [ 157.918685][T11003] ? __lock_release+0x5d/0x180 [ 157.918689][T11003] ? rcu_is_watching (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/context_tracking.h:128 kernel/rcu/tree.c:751) [ 157.918693][T11003] ? trace_preempt_on (include/trace/events/preemptirq.h:53 (discriminator 2) kernel/trace/trace_preemptirq.c:120 (discriminator 2)) [ 157.918697][T11003] ? preempt_count_sub (kernel/sched/core.c:5813 kernel/sched/core.c:5809 kernel/sched/core.c:5831) [ 157.918702][T11003] ? _raw_spin_unlock_irq (include/linux/spinlock_api_smp.h:160 (discriminator 3) kernel/locking/spinlock.c:202 (discriminator 3)) [ 157.918705][T11003] ? __x64_sys_rt_sigprocmask (kernel/signal.c:3340 kernel/signal.c:3318 kernel/signal.c:3318) [ 157.918708][T11003] ? __pfx___x64_sys_rt_sigprocmask (kernel/signal.c:3318) [ 157.918715][T11003] ? __pfx___x64_sys_rt_sigaction (kernel/signal.c:4629) [ 157.918718][T11003] ? __x64_sys_sched_getaffinity (kernel/sched/syscalls.c:1318) [ 157.918722][T11003] ? do_syscall_64 (include/linux/irq-entry-common.h:257 include/linux/entry-common.h:212 arch/x86/entry/syscall_64.c:100) [ 157.918728][T11003] ? do_syscall_64 (arch/x86/entry/syscall_64.c:113) [ 157.918732][T11003] ? do_syscall_64 (include/linux/irq-entry-common.h:257 include/linux/entry-common.h:212 arch/x86/entry/syscall_64.c:100) [ 157.918736][T11003] ? do_syscall_64 (include/linux/irq-entry-common.h:257 include/linux/entry-common.h:212 arch/x86/entry/syscall_64.c:100) [ 157.918741][T11003] ? do_syscall_64 (arch/x86/entry/syscall_64.c:113) [ 157.918745][T11003] ? clear_bhb_loop (arch/x86/entry/entry_64.S:1548) [ 157.918750][T11003] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 157.918753][T11003] RIP: 0033:0x7f07ff473687 [ 157.918770][T11003] Code: 48 89 fa 4c 89 df e8 58 b3 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff All code ======== 0: 48 89 fa mov %rdi,%rdx 3: 4c 89 df mov %r11,%rdi 6: e8 58 b3 00 00 call 0xb363 b: 8b 93 08 03 00 00 mov 0x308(%rbx),%edx 11: 59 pop %rcx 12: 5e pop %rsi 13: 48 83 f8 fc cmp $0xfffffffffffffffc,%rax 17: 74 1a je 0x33 19: 5b pop %rbx 1a: c3 ret 1b: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 22: 00 23: 48 8b 44 24 10 mov 0x10(%rsp),%rax 28: 0f 05 syscall 2a:* 5b pop %rbx <-- trapping instruction 2b: c3 ret 2c: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 33: 83 e2 39 and $0x39,%edx 36: 83 fa 08 cmp $0x8,%edx 39: 75 de jne 0x19 3b: e8 23 ff ff ff call 0xffffffffffffff63 Code starting with the faulting instruction =========================================== 0: 5b pop %rbx 1: c3 ret 2: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 9: 83 e2 39 and $0x39,%edx c: 83 fa 08 cmp $0x8,%edx f: 75 de jne 0xffffffffffffffef 11: e8 23 ff ff ff call 0xffffffffffffff39 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251121/202511211332.c5d11bb6-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki