rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=6337, q=72)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294953922-4294943419), jiffies_till_next_fqs=1, root ->qsmask 0x0
udevd           R  running task    28184  8224   4084 0x0000400a
Call Trace:
 <IRQ>
 sched_show_task+0x40f/0x560 kernel/sched/core.c:5954
 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:538 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq+0x1861/0x1ad0 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
 </IRQ>
RIP: 0010:free_thread_stack+0x168/0x590 kernel/fork.c:284
Code: 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 25 a4 69 00 48 8b 3b be fc ff 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
RSP: 0018:ffffc90001d77948 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81487433 RBX: ffff8880a2312508 RCX: ffff8880947b2040
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00028b1b80
RBP: ffffc90001d77980 R08: 000000000003a768 R09: ffffed1015347297
R10: ffffed1015347297 R11: 0000000000000000 R12: ffff8880a23125a0
R13: dffffc0000000000 R14: 1ffff110144624b4 R15: ffff8880a9a394a8
 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_get_realpath security/tomoyo/file.c:151 [inline]
RIP: 0010:tomoyo_path2_perm+0x2ad/0x9d0 security/tomoyo/file.c:923
Code: 84 a3 00 00 00 44 89 a5 a4 fe ff ff 48 8d bd 10 ff ff ff e8 95 0d 01 00 4c 89 ff e8 5d bf 00 00 48 89 c3 48 8b 85 90 fe ff ff <42> 80 3c 30 00 74 0c 48 8d bd 00 ff ff ff e8 20 85 5c fe 48 89 9d
RSP: 0018:ffffc90001d77b90 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffff920003aef82 RBX: ffff8880a92459c0 RCX: ffff8880947b2040
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: ffffc90001d77d10 R08: ffff8880947b2898 R09: fffffbfff13c8d2e
R10: fffffbfff13c8d2e R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff920003aefa7 R14: dffffc0000000000 R15: ffffc90001d77d20
 tomoyo_path_rename+0xec/0x110 security/tomoyo/tomoyo.c:285
 security_path_rename+0x211/0x2d0 security/security.c:1079
 do_renameat2+0x94d/0xff0 fs/namei.c:4619
 __do_sys_rename fs/namei.c:4669 [inline]
 __se_sys_rename fs/namei.c:4667 [inline]
 __x64_sys_rename+0x68/0x80 fs/namei.c:4667
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7efc4e113527
Code: 32 00 64 83 38 15 74 07 b8 ff ff ff ff 5b c3 48 89 df e8 1c c1 07 00 85 c0 75 ed 31 c0 eb d3 90 90 90 90 b8 52 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 f8 32 00 31 d2 48 29 c2 64
RSP: 002b:00007ffe670e5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efc4e113527
RDX: 00007efc4e444e98 RSI: 00007ffe670e5060 RDI: 00007ffe670e5460
RBP: 000000000193d000 R08: 00007efc4ea867a0 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000019446d0
R13: 000000000192b250 R14: 00007ffe670e5060 R15: 0000000000000001
rcu: rcu_preempt kthread starved for 10541 jiffies! g6337 f0x2 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