rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=30b4/1/0x4000000000000000 softirq=313539/313540 fqs=1
rcu: 	(detected by 1, t=10505 jiffies, g=231357, q=57 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5806 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+0xc7/0x130
Code: 00 00 80 eb 07 44 89 f0 f7 d8 71 d4 f3 90 43 0f b6 44 25 00 84 c0 75 41 44 8b 3d bc 8c 65 0c 48 89 df 4c 89 fe e8 a9 d0 07 03 <41> be 00 00 00 80 41 39 c7 76 d0 41 89 c7 89 c1 c1 e9 06 48 8d 3c
RSP: 0018:ffffc900048d7988 EFLAGS: 00000046
RAX: 0000000000000002 RBX: ffff8881000979d0 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff8881000979d0
RBP: 0000000080000000 R08: ffff888100097853 R09: 1ffff11020012f0a
R10: dffffc0000000000 R11: ffffed1020012f0b R12: dffffc0000000000
R13: 1ffffffff1bf37d3 R14: 0000000080000000 R15: 0000000000000002
FS:  000055556aa53500(0000) GS:ffff88818e0df000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b76ea CR3: 000000010cd3d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __schedule+0x21ff/0x4fe0
 schedule+0x164/0x360
 do_nanosleep+0x1c2/0x620
 hrtimer_nanosleep+0x188/0x390
 __se_sys_clock_nanosleep+0x35b/0x3b0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe83c95b58e
Code: Unable to access opcode bytes at 0x7fe83c95b564.
RSP: 002b:00007fff8a495f58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000055556aa53500 RCX: 00007fe83c95b58e
RDX: 00007fff8a495fb0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff8a49601c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001388
R13: 00000000000927c0 R14: 00000000000e8cdc R15: 00007fff8a496070
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g231357 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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  running task     stack:27688 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x153e/0x4fe0
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 28373 Comm: kworker/u10:2 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+0xce5/0x1270
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 64 b4 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 0f b0 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 f3 af
RSP: 0018:ffffc900017d7760 EFLAGS: 00000293
RAX: ffffffff81b7493d RBX: 1ffff110242084d5 RCX: ffff88817234a480
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900017d78a0 R08: ffffffff8ff028b7 R09: 1ffffffff1fe0516
R10: dffffc0000000000 R11: fffffbfff1fe0517 R12: ffff8881210426a8
R13: dffffc0000000000 R14: ffff88823c63bd80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a96df000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcbc1a7ab08 CR3: 000000000e34a000 CR4: 0000000000352ef0
DR0: 00000000000000ca DR1: 0000000000000006 DR2: 000000000000068f
DR3: 0000000000000008 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f5/0x1160
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x290
 process_one_work+0x949/0x15a0
 worker_thread+0x9af/0xee0
 kthread+0x388/0x470
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
