rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10499 ticks this GP) idle=be9/1/0x4000000000000000 softirq=106246/106246 fqs=3830 (t=10500 jiffies g=202165 q=6775) NMI backtrace for cpu 1 CPU: 1 PID: 7886 Comm: syz-executor.5 Not tainted 5.15.0-next-20211104-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3878 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194 Code: 74 24 10 e8 da 62 0b f8 48 89 ef e8 22 d9 0b f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 23 a2 fe f7 65 8b 05 1c f7 b0 76 85 c0 74 0a 5b 5d c3 e8 20 98 RSP: 0018:ffffc90000dc0c08 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1ff6d3e RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000001 RBP: ffff8880b9d28280 R08: 0000000000000001 R09: ffffffff8ff62adf R10: 0000000000000001 R11: 0000000000000000 R12: 00000001000170e9 R13: ffff8880b9d28280 R14: 0000000000000000 R15: 00000000ffffffff __mod_timer+0x837/0xe30 kernel/time/timer.c:1065 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:tomoyo_check_acl+0xc1/0x450 security/tomoyo/domain.c:173 Code: f5 97 da fd 48 8d 7b 18 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 0f b6 04 28 38 d0 7f 08 84 c0 0f 85 f7 02 00 00 44 0f b6 73 18 <31> ff 44 89 f6 e8 a5 9b da fd 45 84 f6 0f 85 61 01 00 00 e8 b7 97 RSP: 0018:ffffc90003467bf0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88806ff5c880 RCX: ffffc90017a41000 RDX: 0000000000000000 RSI: ffffffff839d335b RDI: ffff88806ff5c898 RBP: dffffc0000000000 R08: 0000000081f8943c R09: 0000000000000000 R10: ffffffff839d3408 R11: 0000000000000000 R12: ffffc90003467cb8 R13: ffff88801901b410 R14: 0000000000000000 R15: 0000000000000000 tomoyo_path_number_perm+0x32a/0x590 security/tomoyo/file.c:733 security_file_ioctl+0x50/0xb0 security/security.c:1541 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f1ce559dae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1ce2af2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1ce56b1020 RCX: 00007f1ce559dae9 RDX: 0000000020001640 RSI: 0000000081f8943c RDI: 0000000000000006 RBP: 00007f1ce55f7f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcc94d55df R14: 00007f1ce2af2300 R15: 0000000000022000 </TASK> ---------------- Code disassembly (best guess): 0: 74 24 je 0x26 2: 10 e8 adc %ch,%al 4: da 62 0b fisubl 0xb(%rdx) 7: f8 clc 8: 48 89 ef mov %rbp,%rdi b: e8 22 d9 0b f8 callq 0xf80bd932 10: 81 e3 00 02 00 00 and $0x200,%ebx 16: 75 25 jne 0x3d 18: 9c pushfq 19: 58 pop %rax 1a: f6 c4 02 test $0x2,%ah 1d: 75 2d jne 0x4c 1f: 48 85 db test %rbx,%rbx 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 23 a2 fe f7 callq 0xf7fea252 <-- trapping instruction 2f: 65 8b 05 1c f7 b0 76 mov %gs:0x76b0f71c(%rip),%eax # 0x76b0f752 36: 85 c0 test %eax,%eax 38: 74 0a je 0x44 3a: 5b pop %rbx 3b: 5d pop %rbp 3c: c3 retq 3d: e8 .byte 0xe8 3e: 20 .byte 0x20 3f: 98 cwtl