rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=70497, q=329 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4294998141-4294987643), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10497 jiffies! g70497 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=32779
rcu: rcu_preempt kthread starved for 10498 jiffies! g70497 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->cpu=1
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:26440 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 18546 Comm: syz.4.3744 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0xcb9/0xd20
Code: 89 df e8 6a f0 89 ff e8 d5 ee 89 ff e8 a0 9e 95 ff e8 1b 90 03 00 45 31 ff 44 89 f8 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d <c3> cc cc cc cc cc 89 05 73 33 0b 12 e9 2c fe ff ff 90 0f 0b 90 e9
RSP: 0018:ffffc900001e07b0 EFLAGS: 00000082
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 35b63336a0ca6600
RDX: 0000000000000000 RSI: ffff8881350ae130 RDI: ffff8881350ad640
RBP: ffffffff81adabcb R08: 0000000000000000 R09: ffffffff81adabcb
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: 0000000000000000
R13: ffff888136627a98 R14: 0000000000000001 R15: 0000000000000046
FS:  00007f120cbf66c0(0000) GS:ffff8881a3c11000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b1fff8 CR3: 0000000120274000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:should_fail_ex+0x52/0x560
Code: 14 89 a2 0d a9 00 01 ff 00 0f 84 ee 00 00 00 49 89 dd 49 c1 ed 03 43 80 7c 25 00 00 74 08 48 89 df e8 72 83 25 fd 48 83 3b 00 <0f> 84 18 01 00 00 4c 8d 7b 20 4c 89 f8 48 c1 e8 03 42 0f b6 04 20
RSP: 0018:ffffc90006ff7818 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8e25a5a0 RCX: 35b63336a0ca6600
RDX: 0000000000000000 RSI: 0000000000000060 RDI: ffffffff8e25a5a0
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff821695bd
R10: dffffc0000000000 R11: ffffed1004797c01 R12: dffffc0000000000
R13: 1ffffffff1c4b4b4 R14: 0000000000000060 R15: ffff8881350aec24
 should_failslab+0xa8/0x100
 kmem_cache_alloc_noprof+0x73/0x3c0
 security_file_alloc+0x34/0x330
 init_file+0x93/0x2f0
 alloc_empty_file+0x6e/0x1d0
 path_openat+0x107/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f120e98ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f120cbf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f120ebd5fa0 RCX: 00007f120e98ec29
RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f120ea11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f120ebd6038 R14: 00007f120ebd5fa0 R15: 00007ffc46e0f5c8
 </TASK>
