INFO: task udevd:5809 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:20200 pid:5809  tgid:5809  ppid:5256   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 nbd_queue_rq+0x857/0x1100
 blk_mq_dispatch_rq_list+0xa70/0x1910
 __blk_mq_sched_dispatch_requests+0xdcc/0x1600
 blk_mq_sched_dispatch_requests+0xd7/0x190
 blk_mq_run_hw_queue+0x348/0x4f0
 blk_mq_dispatch_list+0xd16/0xe10
 blk_mq_flush_plug_list+0x48d/0x570
 __blk_flush_plug+0x3ed/0x4d0
 __submit_bio+0x28d/0x580
 submit_bio_noacct_nocheck+0x2f4/0xa70
 block_read_full_folio+0x599/0x830
 filemap_read_folio+0x137/0x3b0
 do_read_cache_folio+0x358/0x590
 read_part_sector+0xb6/0x2b0
 adfspart_check_ICS+0xa5/0xa40
 bdev_disk_changed+0x7ba/0x1550
 blkdev_get_whole+0x380/0x510
 bdev_open+0x31e/0xd30
 blkdev_open+0x470/0x610
 do_dentry_open+0x785/0x14e0
 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+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdf3f169a4
RSP: 002b:00007fffb2dd5dd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055b9459f6df0 RCX: 00007fbdf3f169a4
RDX: 00000000000a0800 RSI: 000055b9459d4360 RDI: 00000000ffffff9c
RBP: 000055b9459d4360 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055b9459ea950 R14: 0000000000000001 R15: 000055b9459d3910
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5634:
 #0: ffff888112d040a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
1 lock held by udevd/5806:
 #0: ffff888109525358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
3 locks held by udevd/5809:
 #0: ffff8881096a9358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
 #1: ffff888105eefe18 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x31f/0x4f0
 #2: ffff8881096e2980 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xc6/0x1100
1 lock held by udevd/5815:
 #0: ffff888109521358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/7416:
 #0: ffff8881076b5358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/8988:
 #0: ffff8881076b1358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/9302:
 #0: ffff888107351358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/10110:
 #0: ffff888106fdd358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/10427:
 #0: ffff888106fd9358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/12621:
 #0: ffff8881067f9358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/13944:
 #0: ffff88816b25e358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/15297:
 #0: ffff88816042c358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/16086:
 #0: ffff888114d92358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.0.20846/25110:
 #0: ffff88801ed37408 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
2 locks held by syz.1.20847/25114:
 #0: ffffffff8fbc0a50 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8e764938 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
2 locks held by syz.3.20848/25129:
 #0: ffff8881b4042c08 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
 #1: ffffffff8e764938 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd 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
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 5256 Comm: udevd 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: 0033:0x55b92abcf304
Code: 85 c0 74 9c eb d6 83 7b 30 01 75 2a 48 8d 05 53 dd 03 00 48 8b 28 48 8d 05 49 dd 03 00 48 39 c5 0f 84 0c 0d 00 00 4c 8b 65 40 <4c> 3b 63 38 0f 82 0e 01 00 00 75 14 48 8b 1b 48 8d 05 26 dd 03 00
RSP: 002b:00007fffb2dd6000 EFLAGS: 00000202
RAX: 000055b92ac0d040 RBX: 000055b9477f28f0 RCX: 000055b92ac0c640
RDX: 000055b92ac0c640 RSI: 00007fffb2dd60c0 RDI: 000055b9459db960
RBP: 000055b9475593b0 R08: 00000000ffffffff R09: 00007fffb2dd60c0
R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000000270bb
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fbdf42b1c80 GS:  0000000000000000
