rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=38e/1/0x4000000000000002 softirq=10180/10181 fqs=7 (t=10500 jiffies g=6297 q=537) rcu: rcu_preempt kthread starved for 10483 jiffies! g6297 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29032 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 8072 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:free_thread_stack+0x18b/0x590 kernel/fork.c:284 Code: ff ff e8 28 04 00 00 43 80 3c 2e 00 74 08 4c 89 e7 e8 09 a4 69 00 49 8b 1c 24 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 df e8 eb a3 69 00 48 8b 1b e9 82 ff ff ff e8 de 2c 2e RSP: 0018:ffffc900026b7678 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff110125406b1 RBX: ffff888092a03588 RCX: ffff8880993fc540 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00027e5980 RBP: ffffc900026b76b0 R08: 000000000003a768 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: ffff888092a03620 R13: dffffc0000000000 R14: 1ffff110125406c4 R15: ffff8880a8d85668 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:tomoyo_condition_type security/tomoyo/condition.c:381 [inline] RIP: 0010:tomoyo_get_condition+0x56e/0x2370 security/tomoyo/condition.c:594 Code: f8 91 22 fe 49 ff c5 49 83 c4 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 d2 08 5e fe <49> 8b 34 24 4c 89 ff e8 16 7c 8c 04 89 c3 31 ff 89 c6 e8 5b 95 22 RSP: 0018:ffffc900026b78c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02 RAX: 1ffffffff10ae71c RBX: 0000000000000001 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900026b79d8 R08: ffffffff83540a45 R09: ffffc900026b798a R10: fffff520004d6f32 R11: 0000000000000000 R12: ffffffff885738e0 R13: 0000000000000019 R14: 0000000000000018 R15: ffff8880a339d74c tomoyo_update_domain+0xdc/0x7c0 security/tomoyo/domain.c:107 tomoyo_update_path_acl security/tomoyo/file.c:398 [inline] tomoyo_write_file+0x322/0x1040 security/tomoyo/file.c:1022 tomoyo_write_domain2 security/tomoyo/common.c:1150 [inline] tomoyo_add_entry security/tomoyo/common.c:2040 [inline] tomoyo_supervisor+0x1021/0x1330 security/tomoyo/common.c:2101 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_perm+0x5c3/0x850 security/tomoyo/file.c:838 tomoyo_path_symlink+0x95/0xc0 security/tomoyo/tomoyo.c:206 security_path_symlink+0xed/0x170 security/security.c:1053 do_symlinkat+0xf3/0x3f0 fs/namei.c:4148 __do_sys_symlink fs/namei.c:4169 [inline] __se_sys_symlink fs/namei.c:4167 [inline] __x64_sys_symlink+0x60/0x70 fs/namei.c:4167 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a3a7 Code: 0f 1f 00 b8 5c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 6d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff7a342cd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045a3a7 RDX: 00007fff7a342d73 RSI: 00000000004c00e9 RDI: 00007fff7a342d60 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000013 R10: 0000000000000075 R11: 0000000000000206 R12: 0000000000000001 R13: 00007fff7a342d10 R14: 0000000000000000 R15: 00007fff7a342d20