INFO: task udevd:10097 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:10097 tgid:10097 ppid:5057   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: 0033:0x7f91705169a4
RSP: 002b:00007ffd921367b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000559afb1e5780 RCX: 00007f91705169a4
RDX: 00000000000a0800 RSI: 0000559afb1d2ec0 RDI: 00000000ffffff9c
RBP: 0000559afb1d2ec0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 0000559afb1dc950 R14: 0000000000000001 R15: 0000559afb1c5910
 </TASK>

Showing all locks held in the system:
2 locks held by ksoftirqd/0/15:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5436:
 #0: ffff88816e52a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
1 lock held by udevd/10097:
 #0: ffff888105fde350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
2 locks held by syz.1.20777/26351:
 #0: ffffffff8fdcf980 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
 #1: ffffffff8e963068 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

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: 5722 Comm: kworker/u8:3 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: krds_cp_wq#17/0 rds_connect_worker
RIP: 0010:__memcg_slab_post_alloc_hook+0xad/0xe80
Code: 4c 8d 34 c8 49 81 c6 f0 0c 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 3c c3 f7 ff 41 bf 98 07 00 00 4d 03 3e <4c> 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 1d c3 f7 ff
RSP: 0000:ffffc90006bd76f0 EFLAGS: 00000286
RAX: 1ffff110204db51e RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000cc0 RSI: ffff888161e847f8 RDI: ffff8881604153c0
RBP: ffff888161e847f8 R08: ffffc90006bd7808 R09: 0000000099a456cf
R10: 000000000000000d R11: ffffffff81b0d880 R12: dffffc0000000000
R13: ffffc90006bd7808 R14: ffff8881026da8f0 R15: ffff8881026ee518
FS:  0000000000000000(0000) GS:ffff88818dc8a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd2d0be8158 CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 kmem_cache_alloc_lru_noprof+0x346/0x640
 sock_alloc_inode+0x2c/0x190
 alloc_inode+0x6a/0x1b0
 __sock_create+0x12d/0x9d0
 rds_tcp_conn_path_connect+0x2d7/0x930
 rds_connect_worker+0x1d8/0x290
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
