rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=4114/1/0x4000000000000000 softirq=60135/60136 fqs=2
rcu: 	(detected by 0, t=10502 jiffies, g=53281, q=401 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5611 Comm: syz-executor 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:mm_get_cid+0xa8/0x130
Code: 5b 41 5c 41 5d 41 5e 41 5f 5d e9 13 a9 e0 09 cc 49 c7 c5 c8 b4 cf 8d 49 c1 ed 03 bd 00 00 00 80 eb 06 89 c1 f7 d9 71 d8 f3 90 <43> 0f b6 44 25 00 84 c0 75 44 44 8b 3d 4f 0e 3c 0c 48 89 df 4c 89
RSP: 0018:ffffc900050d7988 EFLAGS: 00000887
RAX: 0000000080000000 RBX: ffff8881140f8b90 RCX: 0000000080000000
RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff8881140f8b90
RBP: 0000000080000000 R08: ffff8881140f8a13 R09: 1ffff1102281f142
R10: dffffc0000000000 R11: ffffed102281f143 R12: dffffc0000000000
R13: 1ffffffff1b9f699 R14: 0000000000000002 R15: 0000000000000002
FS:  000055559275c500(0000) GS:ffff8882a9a48000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa56904f270 CR3: 000000010731a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __schedule+0x2226/0x50e0
 schedule+0x164/0x360
 do_nanosleep+0x193/0x5d0
 hrtimer_nanosleep+0x188/0x390
 __se_sys_clock_nanosleep+0x35b/0x3b0
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f134d95d68e
Code: Unable to access opcode bytes at 0x7f134d95d664.
RSP: 002b:00007ffe91dbe448 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000055559275c500 RCX: 00007f134d95d68e
RDX: 00007ffe91dbe4a0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe91dbe50c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000005c55b R15: 00007ffe91dbe560
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g53281 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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  running task     stack:27208 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x157d/0x50e0
 schedule+0x164/0x360
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x1580
 rcu_gp_kthread+0x9d/0x3b0
 kthread+0x787/0x910
 ret_from_fork+0x5b0/0xb20
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 4221 Comm: kworker/u9:12 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
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:smp_call_function_many_cond+0xd6b/0x12b0
Code: 89 f6 83 e6 01 31 ff e8 a3 db 0b 00 41 83 e6 01 49 be 00 00 00 00 00 fc ff df 75 07 e8 4e d7 0b 00 eb 38 f3 90 42 0f b6 04 33 <84> c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 32 d7 0b 00 eb e4 44
RSP: 0018:ffffc90021daf620 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff110478c8129 RCX: ffff888111379d40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90021daf7a0 R08: ffffffff8fc6a777 R09: 1ffffffff1f8d4ee
R10: dffffc0000000000 R11: fffffbfff1f8d4ef R12: ffff88823c640948
R13: ffff88812103bb08 R14: dffffc0000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818e448000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd4e102020 CR3: 000000000e144000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5fd/0x1110
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x250
 process_scheduled_works+0xa2f/0x1470
 worker_thread+0xe79/0x1460
 kthread+0x787/0x910
 ret_from_fork+0x5b0/0xb20
 ret_from_fork_asm+0x1a/0x30
 </TASK>
