rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=23613, q=396 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294968164-4294957662), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g23613 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=12942
rcu: rcu_preempt kthread starved for 10502 jiffies! g23613 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:26728 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: 9076 Comm: syz.3.902 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:__this_cpu_preempt_check+0x0/0x20
Code: 16 a0 b8 f5 eb a7 e8 8f e4 ff ff 66 66 66 66 66 66 2e 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 48 89 fe 48 c7 c7 00 3e e3 8b e9 bd fe ff ff cc cc cc
RSP: 0018:ffffc900001dffd8 EFLAGS: 00000092
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1475451c3b153c00
RDX: 0000000000000000 RSI: ffff888111e727d8 RDI: ffffffff8dba9991
RBP: ffffffff81ada78b R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: 0000000000000000
R13: ffff888136627a98 R14: 0000000000000001 R15: 0000000000000046
FS:  00007f75814a16c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c25212c CR3: 0000000109f40000 CR4: 00000000000006f0
DR0: 0000000000000101 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x130/0x360
 _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+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:sched_balance_rq+0x430a/0x57a0
Code: 00 f6 84 24 a1 03 00 00 02 48 8b 9c 24 a8 00 00 00 0f 85 f3 00 00 00 f7 44 24 28 00 02 00 00 74 01 fb 44 8b b4 24 00 04 00 00 <41> f6 c6 02 0f 85 ff ef ff ff 41 f6 c6 04 0f 84 af 02 00 00 48 83
RSP: 0018:ffffc900001e08c0 EFLAGS: 00000206
RAX: 1475451c3b153c00 RBX: 0000000000000010 RCX: 1475451c3b153c00
RDX: 0000000000000000 RSI: ffffffff8d9ba2bf RDI: ffffffff8be33e00
RBP: ffffc900001e0d78 R08: ffffffff8fa3a937 R09: 1ffffffff1f47526
R10: dffffc0000000000 R11: fffffbfff1f47527 R12: ffffc900001e0cd8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88813663adf0
 sched_balance_domains+0x49f/0x9e0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x70
Code: 5b e9 13 ae 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 d0 a0 92 <65> 8b 15 18 0f e1 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90002c57d70 EFLAGS: 00000246
RAX: ffffffff823706f5 RBX: ffff888123dc1100 RCX: ffff888111e71cc0
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888123dc1110
RBP: 1ffff110223ce4c8 R08: ffff888123dc1113 R09: 1ffff110247b8222
R10: dffffc0000000000 R11: ffffed10247b8223 R12: 000000000000000e
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888123dc1110
 getname_flags+0x1e5/0x540
 do_sys_openat2+0xbc/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f758058eba9
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:00007f75814a1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f75807d5fa0 RCX: 00007f758058eba9
RDX: 00000000000026e1 RSI: 00002000000002c0 RDI: ffffffffffffff9c
RBP: 00007f7580611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f75807d6038 R14: 00007f75807d5fa0 R15: 00007ffe4d107378
 </TASK>
