rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 ticks this GP) idle=9b6c/1/0x4000000000000000 softirq=86078/86078 fqs=0 rcu: (detected by 0, t=10502 jiffies, g=73621, q=1208 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 21337 Comm: syz.0.4146 Not tainted 6.14.0-rc6-syzkaller-00202-ga29967be967e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:mark_lock+0x55/0xc60 kernel/locking/lockdep.c:4712 Code: 8a b5 41 48 8d 44 24 30 48 c7 44 24 38 78 cc 7e 8d 48 c1 e8 03 48 c7 44 24 40 d0 5f 96 81 49 89 c7 48 01 d0 c7 00 f1 f1 f1 f1 40 04 00 f2 f2 f2 c7 40 08 00 f2 f2 f2 c7 40 10 00 00 00 f3 c7 RSP: 0018:ffffc90000a289a0 EFLAGS: 00000086 RAX: fffff5200014513a RBX: ffff88807e342fca RCX: 1ffffffff2dd8c28 RDX: dffffc0000000000 RSI: ffff88807e342fa8 RDI: ffff88807e342440 RBP: ffffc90000a28ae0 R08: 0000000000000000 R09: fffffbfff2dd8b98 R10: ffffffff96ec5cc7 R11: 0000000000000003 R12: ffffed100fc685e5 R13: ffff88807e342440 R14: 0000000000000008 R15: 1ffff9200014513a FS: 00007f35f82716c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c33d759 CR3: 0000000047572000 CR4: 00000000003526f0 DR0: 0000000000000008 DR1: 00000000000000ff DR2: fffffffffffffffb DR3: 3e00000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:4672 [inline] __lock_acquire+0x9f1/0x3c40 kernel/locking/lockdep.c:5182 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 debug_object_deactivate+0x13b/0x370 lib/debugobjects.c:873 debug_hrtimer_deactivate kernel/time/hrtimer.c:460 [inline] debug_deactivate kernel/time/hrtimer.c:502 [inline] __run_hrtimer kernel/time/hrtimer.c:1769 [inline] __hrtimer_run_queues+0x47c/0xae0 kernel/time/hrtimer.c:1865 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:arch_stack_walk+0x86/0x100 arch/x86/kernel/stacktrace.c:27 Code: c0 74 50 49 8b 8e 98 00 00 00 4c 89 f2 4c 89 fe 48 89 df e8 9c ee 08 00 8b 95 70 ff ff ff 85 d2 75 21 eb 2f 4c 89 ef 41 ff d4 <0f> 1f 00 84 c0 74 22 48 89 df e8 ab cd 08 00 8b 85 70 ff ff ff 85 RSP: 0018:ffffc900032a7088 EFLAGS: 00000292 RAX: 0000000000000001 RBX: ffffc900032a7088 RCX: 0000000000000000 RDX: 1ffff92000654e37 RSI: ffffffff821cdf13 RDI: ffffc900032a7154 RBP: ffffc900032a7118 R08: ffffc900032a70bc R09: ffffffff90faab8a R10: ffffc900032a7088 R11: 000000000000a5b0 R12: ffffffff81a5ad30 R13: ffffc900032a7148 R14: 0000000000000000 R15: ffff88807e342440 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_node_track_caller_noprof+0x222/0x510 mm/slub.c:4313 kmemdup_noprof+0x29/0x60 mm/util.c:135 kmemdup_noprof include/linux/fortify-string.h:765 [inline] sidtab_sid2str_get+0x17a/0x680 security/selinux/ss/sidtab.c:625 sidtab_entry_to_string+0x33/0x110 security/selinux/ss/services.c:1295 security_sid_to_context_core+0x35c/0x640 security/selinux/ss/services.c:1398 avc_audit_post_callback+0x1ac/0x8c0 security/selinux/avc.c:710 common_lsm_audit+0x33e/0x2290 security/lsm_audit.c:464 slow_avc_audit+0x17d/0x210 security/selinux/avc.c:779 audit_inode_permission+0x1e9/0x290 security/selinux/hooks.c:3087 selinux_inode_permission+0x4af/0x590 security/selinux/hooks.c:3126 security_inode_permission+0xda/0x260 security/security.c:2324 inode_permission fs/namei.c:600 [inline] inode_permission+0x17a/0x5f0 fs/namei.c:567 may_open+0x11c/0x400 fs/namei.c:3420 do_open fs/namei.c:3828 [inline] path_openat+0x13d3/0x2d80 fs/namei.c:3989 do_filp_open+0x20c/0x470 fs/namei.c:4016 do_sys_openat2+0x17a/0x1e0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f35f738d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f35f8271038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f35f75a5fa0 RCX: 00007f35f738d169 RDX: 0000000000020042 RSI: 0000400000000840 RDI: ffffffffffffff9c RBP: 00007f35f740e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f35f75a5fa0 R15: 00007ffde06ec9f8 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g73621 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=73506 rcu: rcu_preempt kthread starved for 10502 jiffies! g73621 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:28344 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0xf43/0x5890 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6857 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244