rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=62fc/1/0x4000000000000000 softirq=24433/24433 fqs=0 rcu: (detected by 0, t=10503 jiffies, g=41221, q=619 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5074 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 RIP: 0010:lock_is_held_type+0x107/0x150 kernel/locking/lockdep.c:5830 Code: 00 00 b8 ff ff ff ff 65 0f c1 05 2c 43 30 75 83 f8 01 75 2d 9c 58 f6 c4 02 75 43 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 45 31 ed eb RSP: 0018:ffffc90000a08d48 EFLAGS: 00000086 RAX: 0000000000000046 RBX: ffff8880298ee550 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8b0cba40 RDI: ffffffff8b6e88a0 RBP: ffff88801aefc300 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000003 R12: ffff8880298eda00 R13: 0000000000000001 R14: 00000000ffffffff R15: 0000000000000003 FS: 000055558dc2a480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558dc3b978 CR3: 00000000614ac000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:231 [inline] advance_sched+0x819/0xc60 net/sched/sch_taprio.c:925 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x410 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 a6 3f 95 f6 48 89 df e8 0e bb 95 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 95 08 87 f6 65 8b 05 e6 d0 2d 75 85 c0 74 16 5b RSP: 0018:ffffc9000374f968 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffffffff8d816a60 RCX: 1ffffffff27bc83c RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: ffffffff8b6e88a0 RBP: 0000000000000246 R08: 0000000000000001 R09: fffffbfff27b4e43 R10: ffffffff93da721f R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000246 R14: 0000000000000000 R15: ffff88807639beb0 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] __wake_up_common_lock kernel/sched/wait.c:108 [inline] __wake_up+0x3f/0x60 kernel/sched/wait.c:127 audit_log_end+0x10c/0x2b0 kernel/audit.c:2441 common_lsm_audit+0x270/0x2220 security/lsm_audit.c:463 slow_avc_audit+0x17d/0x210 security/selinux/avc.c:781 avc_audit security/selinux/include/avc.h:127 [inline] avc_has_perm+0x18d/0x1c0 security/selinux/avc.c:1195 may_link+0x26b/0x320 security/selinux/hooks.c:1879 security_inode_rmdir+0xdd/0x150 security/security.c:2101 vfs_rmdir fs/namei.c:4205 [inline] vfs_rmdir+0x1a0/0x660 fs/namei.c:4186 do_rmdir+0x3a2/0x410 fs/namei.c:4268 __do_sys_unlinkat fs/namei.c:4444 [inline] __se_sys_unlinkat fs/namei.c:4438 [inline] __x64_sys_unlinkat+0xf3/0x130 fs/namei.c:4438 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fdb0747d587 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe208a8d58 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fdb0747d587 RDX: 0000000000000200 RSI: 00007ffe208a9f00 RDI: 00000000ffffff9c RBP: 00007fdb074c93b9 R08: 000055558dc3399b R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffe208a9f00 R13: 00007fdb074c93b9 R14: 00000000000497b9 R15: 000000000000000f rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g41221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=24772 rcu: rcu_preempt kthread starved for 10503 jiffies! g41221 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:28144 pid:16 tgid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5c70 kernel/sched/core.c:6736 __schedule_loop kernel/sched/core.c:6813 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6828 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2572 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1663 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1862 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243