rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=184897, q=303 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295055383-4295044881), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g184897 f0x2 RCU_GP_WAIT_FQS(5) ->state=R
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=73254
rcu: rcu_preempt kthread starved for 10502 jiffies! g184897 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R stack:27696 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d4/0x5820
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5042 Comm: udevd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:_raw_spin_unlock_irqrestore+0x4/0x80
Code: cc cc e8 ef e3 4e f5 5b c3 cc cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <41> 56 53 48 89 f3 49 89 fe 48 83 c7 18 48 8b 74 24 10 e8 25 c4 be
RSP: 0018:ffffc90000007db8 EFLAGS: 00000086
RAX: cbd1b9c70d9d9b00 RBX: 0000000000000001 RCX: 0000000000000002
RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffff9ac50f10
RBP: ffff88810f2ee300 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f98 R12: ffff888121028280
R13: dffffc0000000000 R14: ffff888121028420 R15: ffff888121028410
FS:  00007fc91d184c80(0000) GS:ffff88818d6e6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd1659cca0 CR3: 000000011364a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x239/0xa10
 hrtimer_interrupt+0x4cd/0xaa0
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 7d 39 bf f5 f7 c3 00 02 00 00 74 05 e8 b0 70 eb f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 64 57 b0 f5 65 48 8b 05 2c 1e af 07 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc900030cf838 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000286 RCX: 8000000000000001
RDX: 0000000000000007 RSI: ffffffff8e472e42 RDI: 0000000000000001
RBP: ffff88816dba92b8 R08: ffffffff907a0c7f R09: 1ffffffff20f418f
R10: dffffc0000000000 R11: fffffbfff20f4190 R12: 0000000000000000
R13: ffff888114d16000 R14: ffffffff9ac104e8 R15: 0000000000000000
 debug_check_no_obj_freed+0x39e/0x450
 kfree+0x13e/0x650
 tomoyo_path_perm+0x403/0x560
 security_inode_getattr+0x12b/0x310
 vfs_getattr+0x23/0x70
 vfs_statx_path+0x2b/0x230
 vfs_statx+0x12e/0x200
 vfs_fstatat+0x11b/0x170
 __x64_sys_newfstatat+0x151/0x200
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc91cd165f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007fffb03dcf38 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000559ab68c5ce0 RCX: 00007fc91cd165f4
RDX: 00007fffb03dcf48 RSI: 0000559a8af82302 RDI: 00000000ffffff9c
RBP: 0000559ab68b5910 R08: 00000000ffffffff R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000559a8af965e8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
