INFO: task udevd:5620 blocked in I/O wait 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:24112 pid:5620  tgid:5620  ppid:5058   task_flags:0x400140 flags:0x00080802
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 io_schedule+0x7f/0xd0
 folio_wait_bit_common+0x836/0xbc0
 do_read_cache_folio+0x1ac/0x590
 read_part_sector+0xb6/0x2b0
 adfspart_check_POWERTEC+0x9a/0x7a0
 bdev_disk_changed+0x851/0x17a0
 blkdev_get_whole+0x372/0x510
 bdev_open+0x324/0xd70
 blkdev_open+0x461/0x600
 do_dentry_open+0x816/0x1380
 vfs_open+0x3b/0x340
 path_openat+0x2e44/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f365ff169a4
RSP: 002b:00007ffda0327f90 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000555ac98ae780 RCX: 00007f365ff169a4
RDX: 00000000000a0800 RSI: 0000555ac98b21f0 RDI: 00000000ffffff9c
RBP: 0000555ac98b21f0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 0000555ac98a2800 R14: 0000000000000001 R15: 0000555ac988e910
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5442:
 #0: ffff88811081e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
1 lock held by udevd/5620:
 #0: ffff88816d6d3350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70
2 locks held by syz.1.4519/26406:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 13 Comm: kworker/u8:1 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
Workqueue: netns cleanup_net
RIP: 0010:pcpu_alloc+0x1b1/0x310
Code: 4c 89 ef e8 91 87 55 fd 4d 89 65 00 4d 85 e4 74 27 49 83 c4 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 e7 e8 65 87 55 fd 4d 89 2c 24 49 bc 00 00 00 00 00 fc
RSP: 0018:ffffc90000127578 EFLAGS: 00000046
RAX: 1ffff11021df4608 RBX: ffff8881bd07a388 RCX: dffffc0000000000
RDX: ffffffff8bee2840 RSI: ffffffff8c4bdb60 RDI: ffffffff8c4bdb20
RBP: ffff8881bd07a380 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff81aaefa0 R12: ffff88810efa3040
R13: ffff88812103cc80 R14: 1ffff11037a0f470 R15: 1ffff11037a0f471
FS:  0000000000000000(0000) GS:ffff88818d950000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0d119ec158 CR3: 0000000041e80000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 alloc_object+0xbf/0x300
 debug_object_activate+0x17f/0x420
 call_rcu+0x43/0x8b0
 kernfs_put+0x622/0x820
 kernfs_remove_by_name_ns+0xc8/0x140
 sysfs_remove_group+0x101/0x2e0
 sysfs_remove_groups+0x54/0xb0
 ib_free_port_attrs+0xc4/0x3a0
 rdma_dev_exit_net+0x1d8/0x340
 ops_undo_list+0x43d/0x8d0
 cleanup_net+0x572/0x810
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
