rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=b4a/1/0x4000000000000004 softirq=44550/44550 fqs=0 (t=10500 jiffies g=66533 q=2797) rcu: rcu_preempt kthread starved for 10500 jiffies! g66533 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I29112 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline] rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 8754 Comm: udevd Not tainted 5.3.0-rc7+ #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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf 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:2736 [inline] rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:__list_add include/linux/list.h:60 [inline] RIP: 0010:list_add_tail include/linux/list.h:93 [inline] RIP: 0010:list_move_tail include/linux/list.h:214 [inline] RIP: 0010:hhf_dequeue+0x661/0xa20 net/sched/sch_hhf.c:439 Code: 89 3e e8 12 94 aa fb 4d 8d b5 98 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 0f 85 5b 03 00 00 4d 8b bd 98 03 00 00 48 89 df <48> 8b 55 c8 4c 89 fe e8 13 70 76 fd 31 ff 89 c6 88 45 b0 e8 17 95 RSP: 0018:ffff8880ae8094f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11015265343 RBX: ffff8880a9329978 RCX: ffffffff85c7e0d1 RDX: 0000000000000100 RSI: ffffffff85c7e13e RDI: ffff8880a9329978 RBP: ffff8880ae809548 R08: ffff888098e862c0 R09: fffffbfff14e9555 R10: ffff888098e86c40 R11: ffff888098e862c0 R12: dffffc0000000000 R13: ffff8880a9329680 R14: ffff8880a9329a18 R15: ffff8880a9329a10 dequeue_skb net/sched/sch_generic.c:258 [inline] qdisc_restart net/sched/sch_generic.c:361 [inline] __qdisc_run+0x1e7/0x19d0 net/sched/sch_generic.c:379 __dev_xmit_skb net/core/dev.c:3533 [inline] __dev_queue_xmit+0x16f1/0x3650 net/core/dev.c:3838 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902 neigh_direct_output+0x16/0x20 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x1034/0x2520 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xa50 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0xf29/0x1450 net/ipv6/ndisc.c:505 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:699 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3879 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:tomoyo_path_matches_pattern+0x5d/0x2b0 security/tomoyo/util.c:922 Code: 51 02 00 00 48 89 da 4d 8b 2c 24 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 3f 02 00 00 48 8d 7b 0f 4c 8b 33 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 48 RSP: 0018:ffff8880664078f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8880a8ffc018 RCX: ffffffff83051628 RDX: 1ffff110151ff803 RSI: ffffffff830632cc RDI: ffff8880a8ffc027 RBP: ffff888066407920 R08: ffff888098e862c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888066407a88 R13: ffff8880a0de0ec0 R14: ffff8880a8ffc028 R15: 0000000000000000 tomoyo_compare_name_union security/tomoyo/file.c:87 [inline] tomoyo_compare_name_union+0x88/0xf0 security/tomoyo/file.c:82 tomoyo_check_path_acl security/tomoyo/file.c:260 [inline] tomoyo_check_path_acl+0xd0/0x130 security/tomoyo/file.c:252 tomoyo_check_acl+0x141/0x3e0 security/tomoyo/domain.c:172 tomoyo_path_permission security/tomoyo/file.c:586 [inline] tomoyo_path_permission+0x1fb/0x360 security/tomoyo/file.c:573 tomoyo_path_perm+0x31d/0x430 security/tomoyo/file.c:838 tomoyo_inode_getattr+0x1d/0x30 security/tomoyo/tomoyo.c:129 security_inode_getattr+0xf2/0x150 security/security.c:1182 vfs_getattr+0x25/0x70 fs/stat.c:115 vfs_statx+0x157/0x200 fs/stat.c:191 vfs_stat include/linux/fs.h:3188 [inline] __do_sys_newstat+0xa4/0x130 fs/stat.c:341 __se_sys_newstat fs/stat.c:337 [inline] __x64_sys_newstat+0x54/0x80 fs/stat.c:337 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f7aa975fc65 Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 90 90 90 90 90 90 90 90 83 ff 01 48 89 f0 77 18 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 17 f3 c3 90 48 8b 05 a1 51 2b 00 64 c7 00 16 RSP: 002b:00007ffdc07d03b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 00007ffdc07d0450 RCX: 00007f7aa975fc65 RDX: 00007ffdc07d03c0 RSI: 00007ffdc07d03c0 RDI: 00007ffdc07d0450 RBP: 00000000024ac720 R08: 00007ffdc07d0460 R09: 00007f7aa97b61a0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002493250 R13: 0000000000000000 R14: 0000000002493250 R15: 000000000000000b