INFO: task udevd:15896 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:22424 pid:15896 tgid:15896 ppid:5060   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 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+0x9a/0x7a0
 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: 0033:0x7f67551649a4
RSP: 002b:00007ffdcb93f630 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055adf7d21e00 RCX: 00007f67551649a4
RDX: 00000000000a0800 RSI: 000055adf7cfd4c0 RDI: 00000000ffffff9c
RBP: 000055adf7cfd4c0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055adf7d0daa0 R14: 0000000000000001 R15: 000055adf7cfc910
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by klogd/5049:
2 locks held by getty/5440:
 #0: ffff888171aef0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
1 lock held by udevd/15896:
 #0: ffff88816aaff350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/18852:
 #0: ffff8881b2ac1350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/19650:
 #0: ffff8881b438c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/19859:
 #0: ffff888112811350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/20051:
 #0: ffff88816aa7e350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
3 locks held by syz.0.7709/2038:

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

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: 2038 Comm: syz.0.7709 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:__lock_acquire+0x181c/0x2cf0
Code: 81 ff 00 10 00 00 0f 83 8a 01 00 00 4e 8b 24 fd 40 88 41 96 ff c0 25 ff 0f 00 00 89 05 7d 3d a0 14 4d 85 e4 0f 84 b2 01 00 00 <49> 8b 44 24 10 48 85 c0 0f 84 1c 0d 00 00 8b 0d 68 3d a0 14 39 48
RSP: 0018:ffffc9000271eff0 EFLAGS: 00000086
RAX: ffffffff93e23410 RBX: 00000000000003dd RCX: ffffffff96cf6978
RDX: ffffffff93e6ff68 RSI: ffff88816b8ae4d8 RDI: 00000000000003dd
RBP: 456e0868a3eb47ad R08: ffffc9000271efb8 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff81a21d20 R12: ffffffff96cf6978
R13: ffff88816b8ae4d8 R14: ffff88816b8ad880 R15: 00000000000000a4
FS:  00007fd8cda086c0(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000016a9e4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350
 psi_write_begin+0xab/0x160
 psi_account_irqtime+0x1e2/0x6f0
 __schedule+0xa94/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 51 f4 06 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 3b 7f 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d c8 5e 92
RSP: 0018:ffffc9000271f5b0 EFLAGS: 00000282
RAX: ad4d2321fb433400 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000064317000 RSI: ffffffff8e219dd2 RDI: ffffffff8c28ade0
RBP: ffffffff8201207d R08: ffffffff8201207d R09: ffffffff8e7eb750
R10: dffffc0000000000 R11: fffff520004e3eac R12: 0000000000000001
R13: ffffffff8e7eb750 R14: 0000000000000001 R15: 0000000000000246
 cpus_read_lock+0x42/0x160
 static_key_slow_dec+0x3d/0x90
 udpv6_destroy_sock+0x206/0x270
 sk_common_release+0x75/0x310
 inet_release+0x143/0x190
 sock_release+0x85/0x150
 rxrpc_lookup_local+0xfc7/0x1500
 rxrpc_bind+0x198/0x460
 kernel_bind+0x13e/0x1c0
 afs_open_socket+0x242/0x3f0
 afs_net_init+0x67d/0x880
 ops_init+0x35c/0x5c0
 setup_net+0x118/0x340
 copy_net_ns+0x50e/0x730
 create_new_namespaces+0x3e7/0x6a0
 unshare_nsproxy_namespaces+0x149/0x190
 ksys_unshare+0x57d/0x9f0
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd8ccb9cdd9
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:00007fd8cda08028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fd8cce16090 RCX: 00007fd8ccb9cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007fd8ccc32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd8cce16128 R14: 00007fd8cce16090 R15: 00007fffaca1df18
 </TASK>
