INFO: task udevd:15340 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:15340 tgid:15340 ppid:5059   task_flags:0x400140 flags:0x00080800
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 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: 0033:0x7fbafc3169a4
RSP: 002b:00007fff4f114940 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055d516d18780 RCX: 00007fbafc3169a4
RDX: 00000000000a0800 RSI: 000055d516d0ecc0 RDI: 00000000ffffff9c
RBP: 000055d516d0ecc0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055d516d09aa0 R14: 0000000000000001 R15: 000055d516cf8910
 </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
2 locks held by getty/5439:
 #0: ffff8881122f00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
1 lock held by udevd/15147:
 #0: ffff888169f34350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
3 locks held by udevd/15340:
 #0: ffff888169f30350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
 #1: ffff888166715b18 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x31f/0x4f0
 #2: ffff88810b0c8178 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xc6/0x1100
1 lock held by syz.4.23848/29145:
 #0: ffffffff8e962f78 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580
1 lock held by syz.0.23849/29147:

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

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+0xfd3/0x1030
 kthread+0x389/0x470
 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: 29147 Comm: syz.0.23849 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:udpv6_recvmsg+0x20/0x1390
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 20 01 00 00 89 4c 24 30 <48> 89 54 24 10 48 89 74 24 20 49 89 fc 65 48 8b 05 0b 88 dd 08 48
RSP: 0018:ffffc900043ff720 EFLAGS: 00000282
RAX: ffffffff8a50cbb7 RBX: dffffc0000000000 RCX: 0000000000000300
RDX: 0000000000000000 RSI: ffffc900043ffce0 RDI: ffff88816f971b00
RBP: ffffc900043ff878 R08: ffffc900043ff9bf R09: 0000000000000000
R10: ffffc900043ff940 R11: fffff5200087ff38 R12: ffffffff8a50cad0
R13: ffffffff8ceca538 R14: ffff88811298c240 R15: 0000000000000300
FS:  00007f46704ca6c0(0000) GS:ffff8882a927a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000007c1030 CR3: 000000023504a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 sock_recvmsg_nosec+0x95/0x140
 ____sys_recvmsg+0x3e3/0x4a0
 ___sys_recvmsg+0x215/0x590
 do_recvmmsg+0x334/0x800
 __x64_sys_recvmmsg+0x198/0x250
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f466f59ce59
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:00007f46704ca028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f466f815fa0 RCX: 00007f466f59ce59
RDX: 000000000400023c RSI: 00002000000055c0 RDI: 0000000000000007
RBP: 00007f466f632d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000300 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f466f816038 R14: 00007f466f815fa0 R15: 00007ffd5ffcfdb8
 </TASK>
