rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=c8f/1/0x4000000000000000 softirq=50847/50847 fqs=0 (detected by 1, t=10502 jiffies, g=82513, q=30) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 25935 Comm: syz-executor.4 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_is_held_type+0x125/0x190 kernel/locking/lockdep.c:5670 Code: 48 c7 c7 e0 01 4f 8a e8 d9 10 00 00 b8 ff ff ff ff 65 0f c1 05 2c ef 08 76 83 f8 01 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b RSP: 0018:ffffc90000007998 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000010003 RDX: 0000000000000000 RSI: 0000000000010003 RDI: 0000000000000000 RBP: 0000000000000002 R08: dffffc0000000000 R09: ffffed10173864a2 R10: ffffed10173864a2 R11: 0000000000000000 R12: 0000000000000046 R13: ffff888059973900 R14: 00000000ffffffff R15: ffffffff8c91c0e0 FS: 00007f465f20a700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f465f207ff8 CR3: 000000006f202000 CR4: 00000000003506f0 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x89/0x130 kernel/rcu/update.c:125 trace_lock_acquire+0x59/0x190 include/trace/events/lock.h:13 lock_acquire+0xa5/0x4d0 kernel/locking/lockdep.c:5596 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 debug_object_deactivate+0x61/0x400 lib/debugobjects.c:735 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate kernel/time/hrtimer.c:481 [inline] __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x2f9/0xa60 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:tomoyo_check_acl+0xb1/0x430 security/tomoyo/domain.c:173 Code: 85 05 03 00 00 48 8b 1c 24 4c 8b 23 49 39 dc 0f 84 14 02 00 00 0f 1f 40 00 49 8d 6c 24 18 48 89 e8 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 1d 01 00 00 0f b6 6d 00 31 ff 89 ee e8 6a 2b aa fd 85 RSP: 0018:ffffc900161a74f8 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff888019969090 RCX: 0000000000040000 RDX: ffffc90011bfa000 RSI: 0000000000000eaf RDI: 0000000000000eb0 RBP: ffff88801af55098 R08: ffffffff83d89ea5 R09: ffffffff83d9e692 R10: 0000000000000002 R11: ffff888059973900 R12: ffff88801af55080 R13: dffffc0000000000 R14: ffff888019969080 R15: 0000000000000000 tomoyo_path_permission+0x1af/0x370 security/tomoyo/file.c:586 tomoyo_check_open_permission+0x2e9/0x490 security/tomoyo/file.c:777 security_file_open+0x50/0x570 security/security.c:1634 do_dentry_open+0x36c/0x1020 fs/open.c:809 do_open fs/namei.c:3428 [inline] path_openat+0x28b4/0x3670 fs/namei.c:3561 do_filp_open+0x277/0x4f0 fs/namei.c:3588 do_sys_openat2+0x13b/0x500 fs/open.c:1200 do_sys_open fs/open.c:1216 [inline] __do_sys_openat fs/open.c:1232 [inline] __se_sys_openat fs/open.c:1227 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1227 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f4661c467f4 Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44 RSP: 002b:00007f465f208040 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4661d97f60 RCX: 00007f4661c467f4 RDX: 0000000000000002 RSI: 00007f4661ceca91 RDI: 00000000ffffff9c RBP: 00007f4661ceca91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000020000000 R15: 0000000000022000 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g82513 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=28921 rcu: rcu_preempt kthread starved for 10502 jiffies! g82513 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 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:26768 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1957 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2130 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: ---------------- Code disassembly (best guess): 0: 48 c7 c7 e0 01 4f 8a mov $0xffffffff8a4f01e0,%rdi 7: e8 d9 10 00 00 callq 0x10e5 c: b8 ff ff ff ff mov $0xffffffff,%eax 11: 65 0f c1 05 2c ef 08 xadd %eax,%gs:0x7608ef2c(%rip) # 0x7608ef45 18: 76 19: 83 f8 01 cmp $0x1,%eax 1c: 75 40 jne 0x5e 1e: 48 c7 04 24 00 00 00 movq $0x0,(%rsp) 25: 00 26: 9c pushfq 27: 8f 04 24 popq (%rsp) * 2a: f7 04 24 00 02 00 00 testl $0x200,(%rsp) <-- trapping instruction 31: 75 46 jne 0x79 33: 41 f7 c4 00 02 00 00 test $0x200,%r12d 3a: 74 01 je 0x3d 3c: fb sti 3d: 65 gs 3e: 48 rex.W 3f: 8b .byte 0x8b