INFO: task syz.0.4962:28351 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.0.4962      state:D stack:25464 pid:28351 tgid:28350 ppid:27825  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f7/0x1550
 bdev_open+0xe0/0xd30
 blkdev_open+0x470/0x610
 do_dentry_open+0x822/0x13a0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbcf995d60e
RSP: 002b:00007fbcfa8f0b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fbcfa8f16c0 RCX: 00007fbcf995d60e
RDX: 0000000000000a00 RSI: 00007fbcfa8f0c00 RDI: ffffffffffffff9c
RBP: 00007fbcfa8f0c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007fbcf9c16038 R14: 00007fbcf9c15fa0 R15: 00007ffd12cd1da8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by udevd/5058:
2 locks held by getty/5437:
 #0: ffff888113b200a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
1 lock held by udevd/23177:
1 lock held by udevd/23705:
 #0: ffff88810941d350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.0.4962/28351:
 #0: ffff88810941d350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30420 Comm: kworker/u10:18 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:__sanitizer_cov_trace_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d d4 eb 60 0c 48 89 de 5b e9 b3 00 60 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d b8 5b 73 11 65 8b 15 d9 5b 73
RSP: 0018:ffffc9000785f680 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92000f0bf0c RCX: 0000000000000000
RDX: ffff88818f565880 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff92000f0bf11 R08: ffff88818f565880 R09: 0000000000000004
R10: 0000000000000011 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc9000785f864 R14: ffffc9000785f840 R15: 0000000000816000
FS:  0000000000000000(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c9cb86980 CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 insn_get_modrm+0xc1/0x7d0
 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>
