rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10506 jiffies, g=59305, q=611 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10506 (4294973494-4294962988), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g59305 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=12750
rcu: rcu_preempt kthread starved for 10506 jiffies! g59305 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:27968 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 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: 11039 Comm: syz.8.563 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:__sanitizer_cov_trace_const_cmp4+0x8/0x90
Code: 89 44 11 20 e9 49 57 e5 09 cc 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 8b 04 24 <65> 48 8b 15 88 4f 73 11 65 8b 0d a9 4f 73 11 81 e1 00 01 ff 00 74
RSP: 0018:ffffc90003a97c88 EFLAGS: 00000046
RAX: ffffffff8501ed23 RBX: 1ffff11020cdbc44 RCX: ffff88816b3a3b00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881066de200 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000752f88 R12: ffff8881052e6000
R13: dffffc0000000000 R14: ffff8881066de200 R15: 0000000000000001
FS:  0000555557fd4500(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cb0cf13420 CR3: 00000001a226e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __vga_put+0x123/0x600
 vga_arb_release+0x269/0x5d0
 __fput+0x44f/0xa60
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fef9c39cdd9
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:00007ffddb38bce8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffddb38bdd0 RCX: 00007fef9c39cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000003f1f7 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b30820000 R11: 0000000000000246 R12: 00007ffddb38be10
R13: 00007fef9c615fac R14: 000000000003f527 R15: 00007fef9c615fa0
 </TASK>
