rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=3a94/1/0x4000000000000000 softirq=81030/81030 fqs=22
rcu: 	(detected by 0, t=10506 jiffies, g=74061, q=198 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 17658 Comm: syz.8.3331 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:hrtimer_cancel+0x33/0x50
Code: e8 12 31 12 00 48 89 df e8 9a f9 ff ff 89 c5 31 ff 89 c6 e8 3f 35 12 00 85 ed 78 0c e8 f6 30 12 00 eb 1a e8 ef 30 12 00 f3 90 <48> 89 df e8 75 f9 ff ff 85 c0 78 ed 89 c5 e8 da 30 12 00 89 e8 5b
RSP: 0018:ffffc900001e0990 EFLAGS: 00000006
RAX: ffffffff81ada231 RBX: ffff88803bc4ad28 RCX: ffff888118f9ba00
RDX: 0000000000010000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: ffff888136627ac3 R09: 1ffff11026cc4f58
R10: dffffc0000000000 R11: ffffed1026cc4f59 R12: ffff88803bc4add0
R13: dffffc0000000000 R14: ffff88803bc4ad28 R15: ffffffffffff1394
FS:  00007f661fdf66c0(0000) GS:ffff8881a39e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c324ea4 CR3: 0000000105b0c000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3b8/0x500
 __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:tomoyo_profile+0x2c/0x50
Code: 40 d6 41 56 53 89 f3 49 89 fe e8 3f fe 3f fd 89 d8 49 8d 1c c6 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 ba a7 a4 fd 48 8b 0b 48 85 c9 48 c7 c0 e0 08 eb
RSP: 0018:ffffc90007fafba8 EFLAGS: 00000246
RAX: 1ffffffff33d63e4 RBX: ffffffff99eb1f20 RCX: dffffc0000000000
RDX: ffffc90021703000 RSI: 0000000000000013 RDI: 0000000000000014
RBP: 0000000000000012 R08: ffffc90007fafcef R09: 0000000000000000
R10: ffffc90007fafca0 R11: fffff52000ff5f9e R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff99eb1f20 R15: ffffc90007fafced
 tomoyo_init_request_info+0xf1/0x340
 tomoyo_path_number_perm+0x180/0x5a0
 security_file_ioctl+0xcb/0x2d0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6621b8eba9
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:00007f661fdf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6621dd5fa0 RCX: 00007f6621b8eba9
RDX: ffffffffffffffff RSI: 0000000040042408 RDI: 000000000000000d
RBP: 00007f6621c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6621dd6038 R14: 00007f6621dd5fa0 R15: 00007ffde8140438
 </TASK>
rcu: rcu_preempt kthread starved for 10395 jiffies! g74061 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: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+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 15229 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:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 e6 7f 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 91 7b 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 75 7b
RSP: 0000:ffffc90003537700 EFLAGS: 00000293
RAX: ffffffff81b457ab RBX: 1ffff11026cc8005 RCX: ffff8880254aba00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003537880 R08: ffffffff8fc43c37 R09: 1ffffffff1f88786
R10: dffffc0000000000 R11: fffffbfff1f88787 R12: ffff888136640028
R13: dffffc0000000000 R14: ffff88804b03b240 R15: 0000000000000001
FS:  000055555cc39500(0000) GS:ffff8880b83e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555cc545c8 CR3: 0000000038360000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 ptep_clear_flush+0x120/0x170
 do_wp_page+0x1bc2/0x5800
 __handle_mm_fault+0x102e/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x82/0x100
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f7bf894d02f
Code: 8d 34 19 48 39 d5 48 89 75 60 0f 95 c2 48 29 d8 48 83 c1 10 0f b6 d2 48 83 c8 01 48 c1 e2 02 48 09 da 48 83 ca 01 48 89 51 f8 <48> 89 46 08 eb 80 48 8d 0d 31 e9 0e 00 48 8d 15 35 fb 0e 00 bf 01
RSP: 002b:00007ffeb5e02620 EFLAGS: 00010206
RAX: 0000000000018a41 RBX: 0000000000008040 RCX: 000055555cc4c590
RDX: 0000000000008041 RSI: 000055555cc545c0 RDI: 0000000000000004
RBP: 00007f7bf8ba7cc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000802 R12: 0000000000008030
R13: 0000000000000076 R14: 00007f7bf8ba7d20 R15: 0000000000000000
 </TASK>
