rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=2434/1/0x4000000000000000 softirq=161098/161098 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=169057, q=197 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32153 Comm: syz.5.7307 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+0x66d/0xd20
Code: eb 36 85 c9 74 1d 45 31 ff 48 8b 3c 24 4c 89 f6 31 d2 e8 d6 25 00 00 48 8b 3c 24 85 c0 0f 84 42 06 00 00 83 bf 14 0b 00 00 00 <74> 1d 48 8b 3c 24 4c 89 f6 ba 04 00 00 00 e8 b0 25 00 00 48 8b 3c
RSP: 0018:ffffc90000007750 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff936ae470
RDX: 0000000000000000 RSI: ffff88812fb88b58 RDI: ffff88812fb88000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ae2edb
R10: dffffc0000000000 R11: ffffed1009604f59 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff88812fb88b58 R15: 0000000000000000
FS:  00007f46a97c06c0(0000) GS:ffff8880b8403000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5c79cf870 CR3: 0000000020102000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000082
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+0x3b8/0x500
 __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:__sanitizer_cov_trace_pc+0x37/0x70
Code: 08 d0 c1 92 65 8b 15 e8 79 01 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 7c 16 00 00 00 74 2c 8b 91 58 16 00 00 <83> fa 02 75 21 48 8b 91 60 16 00 00 48 8b 32 48 8d 7e 01 8b 89 5c
RSP: 0018:ffffc90003eaf970 EFLAGS: 00000246
RAX: ffffffff818cdddd RBX: ffff8880214c4180 RCX: ffff88812fb88000
RDX: 0000000000000002 RSI: 000000000000006b RDI: ffff8880214c4184
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff818cdc48
R10: dffffc0000000000 R11: ffffed1006fd4391 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff8881079f6600 R15: ffff88812fb88000
 __task_pid_nr_ns+0x1bd/0x490
 netlink_autobind+0xab/0x300
 netlink_sendmsg+0x523/0xb30
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x279/0x360
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46a898ec29
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:00007f46a97c0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f46a8bd6090 RCX: 00007f46a898ec29
RDX: 000000000000fe33 RSI: 0000000000000000 RDI: 0000000000000009
RBP: 00007f46a8a11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f46a8bd6128 R14: 00007f46a8bd6090 R15: 00007ffd99363e88
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g169057 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=77779
rcu: rcu_preempt kthread starved for 10502 jiffies! g169057 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26504 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
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+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
