rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=22061, q=170 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294961920-4294951418), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g22061 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=6677
rcu: rcu_preempt kthread starved for 10502 jiffies! g22061 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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:26664 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8252 Comm: syz.1.632 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:hrtimer_try_to_cancel+0x65/0x420
Code: 24 10 48 89 0c 24 48 c1 e9 03 48 89 4c 24 28 48 89 5c 24 08 eb 0a e8 aa 1b 12 00 48 8b 5c 24 08 48 8b 44 24 10 42 80 3c 30 00 <74> 08 48 89 df e8 21 0e 76 00 4c 8b 3b 49 8d 5f 10 49 89 dc 49 c1
RSP: 0000:ffffc900069c7868 EFLAGS: 00000046
RAX: 1ffff110238b7993 RBX: ffff88811c5bcc98 RCX: 1ffff110238b7994
RDX: 0000000000010000 RSI: 0000000000000004 RDI: ffff88811c5bcc68
RBP: 00000000ffffffff R08: ffff88804b027a83 R09: 1ffff11009604f50
R10: dffffc0000000000 R11: ffffed1009604f51 R12: ffff88811c5bcd10
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffffffffffff0205
FS:  00007fc5df9ce6c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b1266 CR3: 0000000028414000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 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+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7fc5dea56116
Code: 00 00 00 00 53 48 89 fb 48 85 ff 74 47 80 3d e4 f5 ea 00 00 75 1e 80 3d af bf 37 00 00 75 55 48 8b 43 18 48 c7 00 00 00 00 00 <c6> 43 48 00 5b c3 0f 1f 40 00 8b 3b 31 d2 31 c0 be 68 63 00 00 e8
RSP: 002b:00007fc5df9ce050 EFLAGS: 00000246
RAX: 00007fc5de5ff000 RBX: 00007fc5dedd6038 RCX: 00007fc5debf0338
RDX: 00000000000134c6 RSI: 0000000000000000 RDI: 00007fc5dedd6038
RBP: 00007fc5dec11e41 R08: 00000000219628cf R09: 7fffffffffffffff
R10: 3fffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5dedd6038 R14: 00007fc5dedd5fa0 R15: 00007ffde0c7b4c8
 </TASK>
