INFO: task udevd:6787 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:22088 pid:6787  tgid:6787  ppid:5061   task_flags:0x400140 flags:0x00080802
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 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: 0033:0x7f2b7cd169a4
RSP: 002b:00007ffc7e9a1cb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000557a4f435780 RCX: 00007f2b7cd169a4
RDX: 00000000000a0800 RSI: 0000557a4f428a70 RDI: 00000000ffffff9c
RBP: 0000557a4f428a70 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 0000557a4f42c950 R14: 0000000000000001 R15: 0000557a4f415910
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5439:
 #0: ffff88811617a0a0 (&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
3 locks held by kworker/1:5/6589:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc9000440fc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff8881b1183250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
1 lock held by udevd/6787:
 #0: ffff88810b962350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.7.3183/18655:
 #0: ffff88816f36f060 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x40/0x6b0
1 lock held by syz.7.3183/18658:
 #0: ffff88816f36f060 (&pipe->mutex){+.+.}-{4:4}, at: splice_to_socket+0x15f/0x11f0
2 locks held by syz.2.3189/18672:
4 locks held by dhcpcd-run-hook/18678:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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: 18672 Comm: syz.2.3189 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mod_lruvec_state+0x2d/0x70
Code: d6 55 41 57 41 56 53 89 d3 89 f5 49 89 fe 4c 8d bf 58 06 00 00 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ff e8 b9 57 f8 ff 49 8b 3f 48 63 d3 89 ee e8 4c e0 d6
RSP: 0018:ffffc900070d7578 EFLAGS: 00000046
RAX: 1ffff110204ddea4 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881026eeec8
RBP: 0000000000000001 R08: ffffea0000a5c5c7 R09: 1ffffd400014b8b8
R10: dffffc0000000000 R11: fffff9400014b8b9 R12: 0000000000000001
R13: ffff8881026eeec8 R14: ffff8881026eeec8 R15: ffff8881026ef520
FS:  00007f7a2e2226c0(0000) GS:ffff88818dc8c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b578bb4950 CR3: 0000000170600000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lru_gen_update_size+0x79d/0xd10
 lru_gen_add_folio+0x487/0xca0
 lru_add+0x79c/0xed0
 folio_batch_move_lru+0x33b/0x550
 __folio_batch_add_and_move+0x510/0xc50
 shmem_alloc_and_add_folio+0xcdd/0xf80
 shmem_get_folio_gfp+0x5a9/0x1670
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2e2/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7a2d35d60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f7a2e221da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7a2e2226c0 RCX: 00007f7a2d35d60e
RDX: 0000000001000000 RSI: 00007f7a23000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007f7a2e221ee0 R14: 00007f7a2e221ea0 R15: 00007f7a23000000
 </TASK>
