rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=896/1/0x4000000000000002 softirq=13707/13708 fqs=39 (t=10501 jiffies g=6597 q=452) rcu: rcu_preempt kthread starved for 10423 jiffies! g6597 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28984 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: 8488 Comm: syz-executor.3 Not tainted 5.5.0-rc5-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:1517 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641 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:mod_memcg_page_state+0xe/0x190 include/linux/memcontrol.h:652 Code: 00 eb 05 e8 e4 27 2e 00 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 54 53 41 89 f6 <48> 89 fb e8 ba 27 2e 00 48 83 c3 38 48 89 d8 48 c1 e8 03 49 bc 00 RSP: 0018:ffffc900025878c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11012493741 RBX: ffff88809249ba08 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002360440 RBP: ffffc900025878e8 R08: 000000000003a728 R09: ffffed1012836b31 R10: ffffed1012836b31 R11: 0000000000000000 R12: ffff88809249baa0 R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff8880941b5978 free_thread_stack+0x168/0x590 kernel/fork.c:280 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:strlen lib/string.c:527 [inline] RIP: 0010:strstr+0x93/0x1a0 lib/string.c:950 Code: 89 fb eb 23 89 d9 80 e1 07 38 c1 7c 2a 49 89 fc 48 89 df 49 89 f5 e8 0c da b6 f9 4c 89 ee 4c 89 e7 eb 14 0f 1f 40 00 48 89 d8 <48> c1 e8 03 42 0f b6 04 38 84 c0 75 cd 80 3b 00 48 8d 5b 01 75 e7 RSP: 0018:ffffc90002587b40 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a38c7436 RBX: ffff8880a38c7436 RCX: ffff8880910543c0 RDX: 0000000000000000 RSI: ffffffff88ee8eb1 RDI: ffff8880a38c7400 RBP: ffffc90002587b80 R08: 000000000000000a R09: ffffc90002587834 R10: 000000000000000b R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000022 R14: 0000000000000012 R15: dffffc0000000000 tomoyo_add_entry security/tomoyo/common.c:2022 [inline] tomoyo_supervisor+0xabb/0x1330 security/tomoyo/common.c:2103 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x471/0x640 security/tomoyo/file.c:734 tomoyo_file_ioctl+0x23/0x30 security/tomoyo/tomoyo.c:335 security_file_ioctl+0x6d/0xd0 security/security.c:1409 ksys_ioctl fs/ioctl.c:747 [inline] __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0xa3/0x120 fs/ioctl.c:754 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45adb7 Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0d b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff23060308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045adb7 RDX: 00007fff23060310 RSI: 0000000000008933 RDI: 0000000000000004 RBP: 00000000004c043a R08: 000000000000000a R09: 0000000000000008 R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000006 R15: 00007fff230606d0