rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (7 ticks this GP) idle=c36/1/0x4000000000000000 softirq=97363/97364 fqs=30 
	(detected by 1, t=10502 jiffies, g=188065, q=52)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3906 Comm: systemd-udevd Not tainted 5.8.0-rc5-next-20200714-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:772 [inline]
RIP: 0010:trace_hrtimer_cancel include/trace/events/timer.h:290 [inline]
RIP: 0010:debug_deactivate kernel/time/hrtimer.c:483 [inline]
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1488 [inline]
RIP: 0010:__hrtimer_run_queues+0xbf0/0xfc0 kernel/time/hrtimer.c:1584
Code: b6 1d 9d 46 4f 09 31 ff 89 de e8 5b ab 0f 00 84 db 0f 84 72 01 00 00 e8 0e af 0f 00 65 ff 0d 17 7c 9d 7e 0f 94 c3 31 ff 89 de <e8> 3b ab 0f 00 84 db 0f 84 35 f8 ff ff e8 ee ae 0f 00 e8 88 f6 9b
RSP: 0018:ffffc90000007de8 EFLAGS: 00000046
RAX: 0000000080010002 RBX: 0000000000000000 RCX: ffffffff816483e4
RDX: ffff8880a37d2300 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ab8ce4f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae627740
R13: ffff8880ae627840 R14: ffff888040fd9340 R15: dffffc0000000000
FS:  00007fc91e04f8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056337d06dfd8 CR3: 00000000a2e41000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1096
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1090
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:tomoyo_path_matches_pattern+0xc/0x280 security/tomoyo/util.c:917
Code: 30 4f fe e9 66 ff ff ff 48 c7 c7 a0 6d 0e 8a e8 0a 30 4f fe e9 53 fe ff ff e8 f0 c5 87 04 41 57 41 56 41 55 41 54 55 48 89 fd <53> 48 89 f3 e8 2b 83 0f fe 48 89 ea 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc900016779b8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff83639032
RDX: 1ffff11014e77784 RSI: ffff8880a6829318 RDI: ffffc90001677b08
RBP: ffffc90001677b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a73bbc00
R13: ffffc90001677b08 R14: 0000000000000000 R15: ffff8880a73bbc20
 tomoyo_compare_name_union security/tomoyo/file.c:87 [inline]
 tomoyo_compare_name_union security/tomoyo/file.c:82 [inline]
 tomoyo_check_path_acl security/tomoyo/file.c:260 [inline]
 tomoyo_check_path_acl+0x164/0x1f0 security/tomoyo/file.c:252
 tomoyo_check_acl+0x138/0x410 security/tomoyo/domain.c:175
 tomoyo_path_permission security/tomoyo/file.c:586 [inline]
 tomoyo_path_permission+0x1f5/0x360 security/tomoyo/file.c:573
 tomoyo_path_perm+0x2e7/0x3f0 security/tomoyo/file.c:838
 security_inode_getattr+0xcf/0x140 security/security.c:1287
 vfs_getattr fs/stat.c:121 [inline]
 vfs_statx+0x170/0x390 fs/stat.c:206
 vfs_lstat include/linux/fs.h:3176 [inline]
 __do_sys_newlstat+0x91/0x110 fs/stat.c:374
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fc91cec2335
Code: Bad RIP value.
RSP: 002b:00007ffdd3ce3e98 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000056337d051920 RCX: 00007fc91cec2335
RDX: 00007ffdd3ce3ed0 RSI: 00007ffdd3ce3ed0 RDI: 000056337d050920
RBP: 00007ffdd3ce3f90 R08: 00007fc91d181258 R09: 0000000000001010
R10: 00007fc91d180b58 R11: 0000000000000246 R12: 000056337d050920
R13: 000056337d05094a R14: 000056337d029dc1 R15: 000056337d029dca
rcu: rcu_preempt kthread starved for 10442 jiffies! g188065 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29120    10      2 0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3445 [inline]
 __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169
 schedule+0xd0/0x2a0 kernel/sched/core.c:4244
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1897
 rcu_gp_fqs_loop kernel/rcu/tree.c:1871 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2041
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294