INFO: task syz.0.2723:19690 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2723      state:D stack:25704 pid:19690 tgid:19689 ppid:15168  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f7/0x1550
 sync_bdevs+0x27e/0x470
 __ia32_sys_sync+0xc5/0x120
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff91e59cdd9
RSP: 002b:00007ff91f48e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007ff91e815fa0 RCX: 00007ff91e59cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ff91e815fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff91e816038 R14: 00007ff91e815fa0 R15: 00007fffb709c508
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/1:1/31:
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5440:
 #0: ffff8881124ee0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by kworker/0:4/5666:
1 lock held by udevd/6130:
 #0: ffff888169a25350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
2 locks held by kworker/u9:2/15372:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: 
ffff888121024588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
1 lock held by syz.0.2723/19690:
 #0: ffff888169a25350 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x27e/0x470
1 lock held by syz.1.3309/22915:
 #0: ffff888116101cc0 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_file_free+0x18c/0x5d0
1 lock held by syz.1.3309/22916:
1 lock held by syz.4.3311/22942:
 #0: ffffffff8e9630a8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd 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
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7261 Comm: kworker/u9:15 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:insn_get_prefixes+0x12d0/0x1ca0
Code: c3 89 f6 eb 22 e8 70 68 1e f6 49 8d 5d 50 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 4c 8b 7c 24 48 0f 85 bd 08 00 00 c6 03 08 <49> 83 c5 14 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 70 04
RSP: 0018:ffffc90004b374e0 EFLAGS: 00000293
RAX: ffffffff8ba73791 RBX: ffffffff8225495f RCX: ffff888105298000
RDX: 0000000000000000 RSI: ffffffff9017f2f0 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888105298000 R09: 0000000000000004
R10: 0000000000000011 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc90004b37840 R14: ffffffff82254960 R15: ffffc90004b37844
FS:  0000000000000000(0000) GS:ffff88818dc91000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdeb605e88 CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 insn_get_opcode+0x6e/0x11b0
 insn_get_modrm+0x64/0x7d0
 insn_get_displacement+0x155/0x9f0
 insn_get_immediate+0x64/0x1280
 insn_decode+0x30e/0x4f0
 __jump_label_patch+0x114/0x4a0
 arch_jump_label_transform_queue+0x69/0x110
 __jump_label_update+0x185/0x380
 static_key_disable_cpuslocked+0xc5/0x1a0
 static_key_disable+0x1a/0x20
 toggle_allocation_gate+0x1fe/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>
