INFO: task udevd:25250 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:21328 pid:25250 tgid:25250 ppid:5253   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ea/0x5050
 schedule+0x164/0x360
 io_schedule+0x7f/0xd0
 folio_wait_bit_common+0x6d8/0xbc0
 do_read_cache_folio+0x1ad/0x590
 read_part_sector+0xb6/0x2b0
 adfspart_check_POWERTEC+0x92/0xef0
 bdev_disk_changed+0x765/0x14c0
 blkdev_get_whole+0x380/0x510
 bdev_open+0x31e/0xd30
 blkdev_open+0x470/0x610
 do_dentry_open+0x7ce/0x1420
 vfs_open+0x3b/0x340
 path_openat+0x3486/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94baf169a4
RSP: 002b:00007fff4846e790 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055a5927bb330 RCX: 00007f94baf169a4
RDX: 00000000000a0800 RSI: 000055a5927a0ad0 RDI: 00000000ffffff9c
RBP: 000055a5927a0ad0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055a5927aa120 R14: 0000000000000001 R15: 000055a592797910
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e55a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5630:
 #0: ffff88817373c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
1 lock held by udevd/25250:
 #0: ffff888172cfc358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
4 locks held by syz.0.36017/16196:
3 locks held by syz.0.36017/16198:
5 locks held by syz.2.36018/16203:
3 locks held by syz.1.36024/16229:
2 locks held by syz.1.36024/16230:
 #0: ffffffff8fa1ac70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8fa1aa88 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10b/0x7a0

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

NMI backtrace for cpu 0
CPU: 0 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/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 16203 Comm: syz.2.36018 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:kernfs_root+0x1e5/0x230
Code: 6e 0d 01 48 c7 c7 a0 60 c1 8b be 80 03 00 00 48 c7 c2 40 61 c1 8b e8 2a 0c 36 ff 48 c7 c7 60 a3 55 8e 48 89 de e8 cb f2 35 ff <e8> d6 d3 3f ff 4c 89 f0 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc
RSP: 0018:ffffc9000833f538 EFLAGS: 00000286
RAX: a47a553742b2c900 RBX: ffffffff826a690c RCX: 0000000000000046
RDX: 0000000000000005 RSI: ffffffff8df3e03a RDI: ffffffff8c073980
RBP: 0000000000000001 R08: ffffffff826a690c R09: ffffffff8e55a360
R10: dffffc0000000000 R11: ffffed102025d125 R12: dffffc0000000000
R13: ffff8881012e8918 R14: ffff8881012e8800 R15: ffff8881d93b3c30
FS:  00007ff257ca76c0(0000) GS:ffff8882a96e8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3020eff8 CR3: 0000000058f94000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 kernfs_add_one+0x2e1/0x5c0
 __kernfs_create_file+0x22b/0x2e0
 sysfs_add_file_mode_ns+0x238/0x300
 internal_create_group+0x673/0x1180
 sysfs_create_groups+0x59/0x120
 ib_setup_port_attrs+0x148f/0x2140
 add_one_compat_dev+0x448/0x650
 rdma_dev_init_net+0x243/0x2f0
 ops_init+0x35c/0x5c0
 setup_net+0x118/0x340
 copy_net_ns+0x50e/0x730
 create_new_namespaces+0x3e7/0x6a0
 unshare_nsproxy_namespaces+0x11a/0x160
 ksys_unshare+0x4f4/0x900
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff256d9bf79
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:00007ff257ca7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff257015fa0 RCX: 00007ff256d9bf79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007ff256e327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff257016038 R14: 00007ff257015fa0 R15: 00007ffdc06f32a8
 </TASK>
