INFO: task udevd:30513 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:23400 pid:30513 tgid:30513 ppid:5056   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 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+0x2f4/0xa40
 block_read_full_folio+0x7b7/0x830
 filemap_read_folio+0x137/0x3b0
 do_read_cache_folio+0x358/0x590
 read_part_sector+0xb6/0x2b0
 adfspart_check_ICS+0xb1/0x960
 bdev_disk_changed+0x817/0x1770
 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+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5f29169a4
RSP: 002b:00007ffc690198e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00005646fb5297b0 RCX: 00007fc5f29169a4
RDX: 00000000000a0800 RSI: 00005646fb4caad0 RDI: 00000000ffffff9c
RBP: 00005646fb4caad0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 00005646fb4d2aa0 R14: 0000000000000001 R15: 00005646fb4c1910
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:1/13:
 #0: ffff8881012b5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90000127c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdc0328 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffffffff8e962f38 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5435:
 #0: ffff8881604dd0a0 (&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
5 locks held by kworker/u8:3/28071:
3 locks held by udevd/30513:
 #0: ffff888113b17350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
 #1: ffff88810ce22d18 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x31f/0x4f0
 #2: ffff888038c69d78 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xc6/0x1100
3 locks held by udevd/808:
 #0: ffff888171f41350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
 #1: ffff8881a33c4898 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x31f/0x4f0
 #2: ffff88804bd60178 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xc6/0x1100

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

NMI backtrace for cpu 1
CPU: 1 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+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: 9799 Comm: syz.3.27033 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:__might_resched+0x1d0/0x4d0
Code: 80 f2 60 8e e8 91 84 9b 00 48 8b 05 da 8f cb 0c 48 8b 0d 33 49 aa 11 48 85 c9 74 1d 48 29 c8 48 83 c0 9c 79 14 48 83 c4 20 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 d2 d4 15 0a cc 48 c7 c0 80 f2 60 8e
RSP: 0018:ffffc900046f7c10 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e21bccd RDI: ffffffff8c28abe0
RBP: dffffc0000000000 R08: ffffffff821867df R09: ffff888060b027f8
R10: dffffc0000000000 R11: fffffbfff206147f R12: ffff88810e025d44
R13: ffff88810e0263a0 R14: ffff88810e025880 R15: 1ffff11021c04ba8
FS:  00007f2cb8ddd6c0(0000) GS:ffff88818dc90000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000045c030 CR3: 00000000707aa000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 do_recvmmsg+0x519/0x800
 __x64_sys_recvmmsg+0x198/0x250
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2cb7f9cdd9
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:00007f2cb8ddd028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f2cb8216090 RCX: 00007f2cb7f9cdd9
RDX: 000000000400023c RSI: 00002000000055c0 RDI: 0000000000000004
RBP: 00007f2cb8032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000300 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2cb8216128 R14: 00007f2cb8216090 R15: 00007ffedad822f8
 </TASK>
