rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=8f5c/1/0x4000000000000000 softirq=200103/200114 fqs=3
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8180/1:b..l
rcu: 	(detected by 0, t=10506 jiffies, g=252581, q=1440 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31147 Comm: syz.9.10236 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:mark_lock+0x0/0x190
Code: 48 0f b9 3a 90 41 89 e9 48 89 df 48 8b 2c 24 e9 b6 fd ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 41 55 41 54 53 8b 46 20 89 c1 81 e1 00 00 03 00 83
RSP: 0018:ffffc90000a08bd8 EFLAGS: 00000006
RAX: 00000000000c406a RBX: 0000000000000001 RCX: ffffffff93e97640
RDX: 0000000000000008 RSI: ffff888110272938 RDI: ffff888110271d80
RBP: 0000000000000000 R08: ffffffff81b293fa R09: ffff88823c628298
R10: dffffc0000000000 R11: fffffbfff2066cbf R12: ffffffffffffff02
R13: ffff888110272938 R14: ffff888110271d80 R15: 0000000000000000
FS:  00007fec341d56c0(0000) GS:ffff8882a921b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3071dff8 CR3: 00000001108f4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __lock_acquire+0x6b5/0x2cf0
 lock_acquire+0x106/0x350
 _raw_spin_lock_irq+0x3d/0x50
 __hrtimer_run_queues+0x46a/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_is_held_type+0x106/0x150
Code: 19 00 00 b8 ff ff ff ff 65 0f c1 05 74 cd 88 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 48 c7
RSP: 0018:ffffc90008aa7a68 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: ffff888110271d80 RSI: ffffffff8e24b9ca RDI: ffffffff8c289de0
RBP: 00000000ffffffff R08: ffffffff84a8b374 R09: ffffffff8e95cce0
R10: dffffc0000000000 R11: ffffed102ed84465 R12: 0000000000000246
R13: ffff888110271d80 R14: ffffffff8e95cce0 R15: 0000000000000000
 io_cqring_wait+0x1231/0x2020
 __se_sys_io_uring_enter+0x581/0x1bf0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fec35f9c819
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:00007fec341d5028 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007fec36216090 RCX: 00007fec35f9c819
RDX: 00000000ffffffdc RSI: 000000000000012a RDI: 0000000000000000
RBP: 00007fec36032c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000017 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fec36216128 R14: 00007fec36216090 R15: 00007ffe7697f8a8
 </TASK>
task:udevadm         state:R  running task     stack:23640 pid:8180  tgid:8180  ppid:8046   task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_notrace+0x57/0x90
 preempt_schedule_notrace_thunk+0x16/0x30
 rcu_is_watching+0x7f/0xb0
 unwind_next_frame+0xd5/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 tomoyo_path_perm+0x403/0x560
 security_inode_getattr+0x12b/0x310
 vfs_getattr+0x23/0x70
 vfs_statx_path+0x2b/0x230
 vfs_statx+0x12e/0x200
 vfs_fstatat+0x11b/0x170
 __x64_sys_newfstatat+0x151/0x200
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b167165f4
RSP: 002b:00007ffd876f5948 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000561a1119d930 RCX: 00007f0b167165f4
RDX: 00007ffd876f5958 RSI: 00007ffd876f5de8 RDI: 00000000ffffff9c
RBP: 00007ffd876f59e8 R08: 0000000000000100 R09: 0000000000000005
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd876f5de8
R13: 00007ffd876f5958 R14: 0000561a1119d910 R15: 0000561a1119da60
 </TASK>
rcu: rcu_preempt kthread starved for 10490 jiffies! g252581 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:27968 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 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: 51 Comm: kworker/u9:2 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+0xfcf/0x13d0
Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 fa fc 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 a5 f8 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 8a f8 0b
RSP: 0000:ffffc90000bb7700 EFLAGS: 00000293
RAX: ffffffff81b9c6e6 RBX: ffff88812103c148 RCX: ffff888106afbb00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000bb7840 R08: ffffffff903365f7 R09: 1ffffffff2066cbe
R10: dffffc0000000000 R11: fffffbfff2066cbf R12: 1ffff110478c8169
R13: dffffc0000000000 R14: ffff88823c640b48 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818dc1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e322ff8 CR3: 000000000e74a000 CR4: 00000000000006f0
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+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
