rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=34521, q=158 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294980462-4294969960), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g34521 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=15516
rcu: rcu_preempt kthread starved for 10502 jiffies! g34521 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:26752 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 8571 Comm: syz.0.982 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d a4 7e 88 0c 48 89 de 5b e9 23 20 62 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 0d 48 de a5 11 65 8b 15 69 de a5
RSP: 0018:ffffc90000a08d88 EFLAGS: 00000002
RAX: ffffffff81b3e07e RBX: ffff88823c6281c0 RCX: 0000000000010000
RDX: ffff8881607fbb80 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff9a9773b3 R09: 1ffffffff352ee76
R10: dffffc0000000000 R11: fffffbfff352ee77 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88816854b300 R15: ffff88823c628300
FS:  00007fae5bfe26c0(0000) GS:ffff8882a8f52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c352a75 CR3: 0000000112a9c000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __remove_hrtimer+0x9c/0x3e0
 __hrtimer_run_queues+0x295/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 3d bd cf f5 f7 c3 00 02 00 00 74 05 e8 c0 9d fb f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> d4 d0 c0 f5 65 8b 05 9d 40 99 07 85 c0 74 18 5b 41 5e e9 81 49
RSP: 0018:ffffc9000aebfaa8 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8e2293d0 RDI: 0000000000000001
RBP: ffffc9000aebfbd0 R08: ffffffff90574c37 R09: 1ffffffff20ae986
R10: dffffc0000000000 R11: fffffbfff20ae987 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8881210281c0 R15: ffff8881210281c0
 clock_was_set+0x62b/0x7e0
 do_adjtimex+0x25d/0x370
 __x64_sys_clock_adjtime+0x252/0x340
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae5b19e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fae5bfe2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fae5b425fa0 RCX: 00007fae5b19e0d9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007fae5b235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fae5b426038 R14: 00007fae5b425fa0 R15: 00007ffca84f9c38
 </TASK>
