rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10504 jiffies, g=73049, q=154 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4294991059-4294980561), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10497 jiffies! g73049 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=29746
rcu: rcu_preempt kthread starved for 10498 jiffies! g73049 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:26632 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+0x3fc/0x770
 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: 15846 Comm: syz.9.1589 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:preempt_count_add+0x9/0x1a0
Code: 19 93 00 eb 8c e9 f1 fe ff ff 0f 1f 80 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 57 41 56 53 <49> bf 00 00 00 00 00 fc ff df 48 c7 c0 20 a3 ab 99 48 c1 e8 03 42
RSP: 0000:ffffc900001e0c80 EFLAGS: 00000046
RAX: 0000000000000802 RBX: ffff888136627a80 RCX: ffff8880229d3980
RDX: 0000000000010000 RSI: ffffffff8be33660 RDI: 0000000000000001
RBP: ffffc900001e0d30 R08: ffffffff8fa38337 R09: 1ffffffff1f47066
R10: dffffc0000000000 R11: fffffbfff1f47067 R12: ffff88811911f340
R13: dffffc0000000000 R14: 1ffff9200003c194 R15: dffffc0000000000
FS:  00007f42701ac6c0(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006000 CR3: 0000000110df4000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 _raw_spin_lock_irq+0x87/0xf0
 __hrtimer_run_queues+0x602/0xc60
 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+0x53/0x70
Code: b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c 16 00 00 48 39 cf <73> 08 48 89 3a 48 89 44 f2 08 e9 8e af bc 09 cc 66 66 66 66 2e 0f
RSP: 0000:ffffc900090d76f8 EFLAGS: 00000283
RAX: ffffffff8a285bdc RBX: 7fffffffffffffff RCX: 0000000000080000
RDX: ffffc900210d5000 RSI: 0000000000033974 RDI: 0000000000033975
RBP: ffffc900090d78d0 R08: ffff8880229d3987 R09: 1ffff1100453a730
R10: dffffc0000000000 R11: ffffed100453a731 R12: ffff88811342e410
R13: 0000000000000000 R14: 7fffffffffffffff R15: 1ffff9200121af00
 unix_dgram_sendmsg+0xbcc/0x1850
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4271f8ebe9
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:00007f42701ac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f42721b6180 RCX: 00007f4271f8ebe9
RDX: 0000000000000651 RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007f4272011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42721b6218 R14: 00007f42721b6180 R15: 00007ffe91741158
 </TASK>
hpet: Lost 16 RTC interrupts
