rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=9644/1/0x4000000000000000 softirq=59968/59969 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11836/1:b..l
rcu: 	(detected by 1, t=10505 jiffies, g=40449, q=85 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11835 Comm: syz.5.1516 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:__lock_acquire+0x332/0xd20
Code: e5 15 09 d5 09 cd 44 09 f5 41 89 6c c7 20 45 89 44 c7 24 4c 89 7c 24 10 4d 8d 34 c7 81 e5 ff 1f 00 00 48 0f a3 2d 3e 1d 0b 12 <73> 10 48 69 c5 c8 00 00 00 48 8d 80 10 93 49 93 eb 40 83 3d a5 ac
RSP: 0000:ffffc90000007750 EFLAGS: 00000003
RAX: 0000000000000000 RBX: ffff88804b027a98 RCX: 0000000000000067
RDX: 0000000000080000 RSI: 0000000000004000 RDI: ffff88801fd78000
RBP: 0000000000000067 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000004000
R13: 0000000000000000 R14: ffff88801fd78af0 R15: ffff88801fd78af0
FS:  00007f06e09706c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32315ff8 CR3: 0000000028a7c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:schedule+0x0/0x360
Code: e8 85 c4 a7 f6 49 89 1f 48 8b 84 24 c0 00 00 00 4c 89 38 e9 42 f7 ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 bd 00 00 00 00 00 fc
RSP: 0000:ffffc9000a0f7f30 EFLAGS: 00000202
RAX: 0000000000000008 RBX: ffffc9000a0f7f58 RCX: 656ac82c31b16200
RDX: 0000000000000000 RSI: ffffffff8d9ba160 RDI: ffffffff8be33e00
RBP: 0000000000000000 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88801fd78000 R15: 0000000000000008
 irqentry_exit_to_user_mode+0x5d/0x120
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f06dfb8eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f06e0970038 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f06dfdd5fa0 RCX: 00007f06dfb8eba9
RDX: 0000000000000008 RSI: 0000000000002402 RDI: 000000000000000d
RBP: 00007f06dfc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06dfdd6038 R14: 00007f06dfdd5fa0 R15: 00007fffbfa1af08
 </TASK>
task:syz.5.1516      state:R  running task     stack:26224 pid:11836 tgid:11834 ppid:8534   task_flags:0x400040 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:memset_orig+0x72/0xb0
Code: 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1 e9 03 66 0f 1f 44 00 00 ff c9 <48> 89 07 48 8d 7f 08 75 f5 83 e2 07 74 0a ff ca 88 07 48 8d 7f 01
RSP: 0018:ffffc9000a227030 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc9000a227140 RCX: 0000000000000001
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc9000a227158
RBP: dffffc0000000000 R08: ffffc9000a227167 R09: 0000000000000000
R10: ffffc9000a227158 R11: fffff52001444e2d R12: ffffc9000a2274b0
R13: ffffc9000a227158 R14: ffffc9000a227108 R15: ffffc9000a227150
 unwind_next_frame+0xc98/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 tomoyo_encode+0x28b/0x550
 tomoyo_realpath_from_path+0x58d/0x5d0
 tomoyo_path_number_perm+0x1e8/0x5a0
 tomoyo_path_mknod+0x142/0x190
 security_path_mknod+0x17e/0x3a0
 path_openat+0xd56/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f06dfb8eba9
RSP: 002b:00007f06e094f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f06dfdd6090 RCX: 00007f06dfb8eba9
RDX: 00000000000026e1 RSI: 0000200000000280 RDI: ffffffffffffff9c
RBP: 00007f06dfc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06dfdd6128 R14: 00007f06dfdd6090 R15: 00007fffbfa1af08
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g40449 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:26728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 9127 Comm: kworker/u10:14 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+0xd38/0x12d0
Code: 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 5f 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 e5 5e 0b 00 eb e4 44
RSP: 0018:ffffc90007267660 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff11009608341 RCX: ffff888129605640
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900072677e0 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffff88804b041a08
R13: dffffc0000000000 R14: ffff88813663b1c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06e094efc8 CR3: 000000000df36000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f9/0x1130
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x250
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xad/0x240
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
