rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=103841, q=558 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294999334-4294988832), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g103841 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=38938
rcu: rcu_preempt kthread starved for 10502 jiffies! g103841 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:27752 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 24096 Comm: syz.0.7560 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
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:advance_sched+0x19c/0xc80
Code: 8d 06 00 00 e8 a5 42 ea f7 eb 05 e8 9e 42 ea f7 48 8b 44 24 28 48 8d 58 f0 48 89 d8 48 c1 e8 03 48 89 44 24 60 42 80 3c 30 00 <74> 08 48 89 df e8 fa 3e 58 f8 48 89 5c 24 30 48 8b 03 48 89 04 24
RSP: 0000:ffffc9000776fc48 EFLAGS: 00000046
RAX: 1ffff110228b505e RBX: ffff8881145a82f0 RCX: ffff8881b7523c00
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881145a8300 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000eedf78 R12: 0000000000000001
R13: ffff8881145a8000 R14: dffffc0000000000 R15: ffff888119886000
FS:  0000555584d3b500(0000) GS:ffff88818d95c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34522ff8 CR3: 00000001bbe30000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __hrtimer_run_queues+0x3bc/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7fe6c7c6e44d
Code: 48 39 f0 0f 82 2a 01 00 00 48 39 f2 72 65 66 0f c6 c0 01 0f 11 45 00 4c 89 e6 eb 09 90 48 8b 4b 08 48 83 c3 08 48 39 d1 72 f3 <48> 8d 46 f8 48 8b 76 f8 48 39 f2 73 13 66 0f 1f 44 00 00 48 8b 70
RSP: 002b:00007ffdb5d759c0 EFLAGS: 00000202
RAX: 00007fe6c78005d8 RBX: 00007fe6c7800228 RCX: ffffffff8bcb752c
RDX: ffffffff8bcb73bc RSI: 00007fe6c78005d8 RDI: 00007fe6c7800168
RBP: 00007fe6c77ffb30 R08: 00007fe6c8010000 R09: 00007fe6c8026038
R10: 0000000000000003 R11: 0000000000000001 R12: 00007fe6c78007a0
R13: 0000000000000010 R14: 000000000000018e R15: 0000000000000003
 </TASK>
