INFO: task udevd:5630 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:22264 pid:5630  tgid:5630  ppid:5065   task_flags:0x400140 flags:0x00080802
Call Trace:
 <TASK>
 __schedule+0x1840/0x57a0
 schedule+0x164/0x360
 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+0x82b/0x1780
 blkdev_get_whole+0x372/0x510
 bdev_open+0x324/0xd70
 blkdev_open+0x461/0x600
 do_dentry_open+0x816/0x1380
 vfs_open+0x3b/0x340
 path_openat+0x2e3b/0x3890
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6faa7169a4
RSP: 002b:00007fffa29cd520 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055c0fc169330 RCX: 00007f6faa7169a4
RDX: 00000000000a0800 RSI: 000055c0fc146600 RDI: 00000000ffffff9c
RBP: 000055c0fc146600 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055c0fc159800 R14: 0000000000000001 R15: 000055c0fc145910
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e958680 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5445:
 #0: ffff8881120f20a0 (&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/0x1380
1 lock held by udevd/5630:
 #0: ffff88810b030350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70
5 locks held by kworker/u8:4/5728:
 #0: ffff8881012b5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90005a47c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff8fdae7e8 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810
 #3: ffff8881012b4aa0 (&root->kernfs_supers_rwsem){++++}-{4:4}, at: kernfs_remove_by_name_ns+0x3f/0x140
 #4: ffff8881012b4980 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_remove_by_name_ns+0x4e/0x140
3 locks held by syz.0.5613/1812:
 #0: ffffffff8fdae7e8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4e2/0x720
 #1: ffff8881012b4aa0 (&root->kernfs_supers_rwsem){++++}-{4:4}, at: kernfs_remove_by_name_ns+0x3f/0x140
 #2: ffff8881012b4980 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_remove_by_name_ns+0x4e/0x140
3 locks held by syz.2.5614/1814:
3 locks held by syz.1.5615/1824:
 #0: ffffffff8fdae7e8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4e2/0x720
 #1: ffffffff8fdbd500 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x60
 #2: ffff8881012b4980 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_add_one+0x2b7/0x5d0

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

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+0xfd7/0x1030
 kthread+0x389/0x470
 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: 1814 Comm: syz.2.5614 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:__sanitizer_cov_trace_pc+0x45/0x70
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 ec 16 00 00 00 74 2c 8b 91 c8 16 00 00 83 fa 02 75 21 48 8b 91 d0 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 cc 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc9000ae27458 EFLAGS: 00000246
RAX: ffffffff8133689e RBX: 00007f250e19ce59 RCX: ffff88810e939dc0
RDX: ffffc90008c95000 RSI: 000000000007ffff RDI: 00007f250e19ce59
RBP: 0000000000000001 R08: ffffc9000ae27f48 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e958680 R12: ffff88810e939dc0
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff920015c4ea2
FS:  00007f250c3f66c0(0000) GS:ffff88818dca5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559f1f104000 CR3: 00000001132ce000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 in_gate_area_no_mm+0xe/0x60
 kernel_text_address+0x2d/0xe0
 __kernel_text_address+0xd/0x30
 unwind_get_return_address+0x4d/0x90
 arch_stack_walk+0xfb/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x8b0
 kernfs_put+0x259/0x520
 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
 setup_net+0x2f6/0x350
 copy_net_ns+0x4f9/0x720
 create_new_namespaces+0x3f0/0x6b0
 unshare_nsproxy_namespaces+0x149/0x190
 ksys_unshare+0x57d/0xa00
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f250e19ce59
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:00007f250c3f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f250e415fa0 RCX: 00007f250e19ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f250e232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f250e416038 R14: 00007f250e415fa0 R15: 00007fff7e9c9138
 </TASK>
