rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=420c/1/0x4000000000000000 softirq=809783/809784 fqs=1
rcu: 	(detected by 1, t=10502 jiffies, g=577141, q=3 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5092 Comm: kworker/u9:5 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:  0x0 (events_unbound)
RIP: 0010:mm_get_cid+0xab/0x130
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49 c7 c5 c8 c4 f7 8d 49 c1 ed 03 bd 00 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 dc 5c 63 0c 48 89 df 4c 89
RSP: 0018:ffffc9000aa6fa08 EFLAGS: 00000887
RAX: 0000000080000000 RBX: ffff88811152ed90 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff88811152ed90
RBP: 0000000080000000 R08: ffff88811152ec13 R09: 1ffff110222a5d82
R10: dffffc0000000000 R11: ffffed10222a5d83 R12: dffffc0000000000
R13: 1ffffffff1bef899 R14: 0000000080000000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff88818e0ec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd75444eddd CR3: 0000000113e6f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __schedule+0x21ad/0x5050
 schedule+0x164/0x360
 worker_thread+0xfb6/0x1360
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g577141 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:27448 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x14ea/0x5050
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x1560
 rcu_gp_kthread+0x9d/0x3b0
 kthread+0x726/0x8b0
 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: 1097 Comm: kworker/u10:6 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 c4 db 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 6f d7 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 53 d7
RSP: 0018:ffffc9000826f6a0 EFLAGS: 00000293
RAX: ffffffff81b89ffd RBX: 1ffff1102420856d RCX: ffff88816c7f24c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000826f7e0 R08: ffffffff8fef2577 R09: 1ffffffff1fde4ae
R10: dffffc0000000000 R11: fffffbfff1fde4af R12: ffff888121042b68
R13: dffffc0000000000 R14: ffff88823c63bb00 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a96ec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd7552efd58 CR3: 000000000e346000 CR4: 0000000000352ef0
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_scheduled_works+0xaec/0x17a0
 worker_thread+0xda6/0x1360
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
