rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=caac/1/0x4000000000000000 softirq=171723/171723 fqs=2
rcu: 	(detected by 0, t=10506 jiffies, g=178845, q=270 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 27723 Comm: syz.6.5453 Tainted: G             L      syzkaller #0 PREEMPT(full) 
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+0xef/0xc80
Code: f2 01 89 c3 31 ff 89 c6 e8 ce 4c e8 f7 85 db 74 28 49 8d 7e c0 be ff ff ff ff e8 0c e1 f2 01 89 c3 31 ff 89 c6 e8 b1 4c e8 f7 <85> db 0f 84 dd 06 00 00 e8 64 48 e8 f7 eb 05 e8 5d 48 e8 f7 4c 89
RSP: 0018:ffffc90000a08d10 EFLAGS: 00000006
RAX: ffffffff89deb64f RBX: 0000000000000001 RCX: 0000000000010000
RDX: ffff88810e59bc00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881bae37300 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141190 R12: 0000000000000000
R13: ffff8881bae37000 R14: ffff8881bae37300 R15: dffffc0000000000
FS:  00007f63d69a06c0(0000) GS:ffff8882a8f4d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000032886000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x3bc/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:format_decode+0xab2/0xda0
Code: ff 89 e9 80 e1 07 38 c1 0f 8c a0 f7 ff ff be 04 00 00 00 48 89 ef e8 bd 34 67 f6 48 ba 00 00 00 00 00 fc ff df e9 84 f7 ff ff <44> 89 f9 80 e1 07 38 c1 0f 8c 8f f7 ff ff 4c 89 ff e8 98 32 67 f6
RSP: 0018:ffffc9000b307a08 EFLAGS: 00000206
RAX: 0000000000000006 RBX: ffffffff8c42e923 RCX: 0000000000080000
RDX: dffffc0000000000 RSI: 0000000000000366 RDI: 0000000000000367
RBP: ffffc9000b307abf R08: ffff88810e59bc00 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000002 R12: 1ffffffff1885d24
R13: 1ffff92001660f57 R14: ffffc9000b307abc R15: ffffffff8c42e923
 vsnprintf+0xff/0xef0
 snprintf+0xe8/0x140
 tomoyo_path_number_perm+0x39d/0x5f0
 security_file_ioctl+0xc3/0x2a0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63d5b9e019
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:00007f63d69a0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f63d5e25fa0 RCX: 00007f63d5b9e019
RDX: 00002000000001c0 RSI: 0000000050009401 RDI: 0000000000000003
RBP: 00007f63d5c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63d5e26038 R14: 00007f63d5e25fa0 R15: 00007fffdd022108
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g178845 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:27656 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:
CPU: 0 UID: 0 PID: 21132 Comm: kworker/u9:24 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0x11e6/0x15f0
Code: c0 75 7a 41 8b 1e 89 de 83 e6 01 31 ff e8 42 21 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 ee 1c 0c 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 d3 1c 0c
RSP: 0018:ffffc90006ccf700 EFLAGS: 00000293
RAX: ffffffff81bae1ed RBX: dffffc0000000000 RCX: ffff88811241bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90006ccf860 R08: ffffffff90578e37 R09: 1ffffffff20af1c6
R10: dffffc0000000000 R11: fffffbfff20af1c7 R12: 1ffff110478c81d1
R13: ffff88812103c448 R14: ffff88823c640e88 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818d94d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f63d5beb700 CR3: 000000000e946000 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/0x290
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
