INFO: task udevd:18693 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:25256 pid:18693 tgid:18693 ppid:5043   task_flags:0x400140 flags:0x00080802
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 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+0x851/0x17a0
 blkdev_get_whole+0x372/0x510
 bdev_open+0x324/0xd70
 blkdev_open+0x461/0x600
 do_dentry_open+0x816/0x1380
 vfs_open+0x3b/0x340
 path_openat+0x1443/0x1d60
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa860d169a4
RSP: 002b:00007ffc3022a490 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055afb6d0d780 RCX: 00007fa860d169a4
RDX: 00000000000a0800 RSI: 000055afb6d09fb0 RDI: 00000000ffffff9c
RBP: 000055afb6d09fb0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055afb6d01800 R14: 0000000000000001 R15: 000055afb6ced910
 </TASK>

Showing all locks held in the system:
locks held by pr/ttyS0/16: 2, last CPU#1:
 #0: ffffffff8ec367b8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x30/0x60
 #1: ffffffff9ad3f098 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x67/0xc0
locks held by khungtaskd/35: 1, last CPU#0:
 #0: ffffffff8ed5cbe0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5420: 2, on CPU#0:
 #0: ffff8881167790a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000347b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by udevd/18693: 1, on CPU#0:
 #0: ffff888109794350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70
locks held by syz.8.4693/28418: 1, on CPU#0:
 #0: ffff88811b27a460 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
locks held by syz.0.5217/30805: 2, on CPU#0:
 #0: ffff8881063640e8 (&type->s_umount_key#63/1){+.+.}-{4:4}, at: sget_fc+0x97c/0x1a40
 #1: ffff888109794350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70
locks held by syz.3.5241/30875: 2, last CPU#0:
 #0: ffff8881bd07e9b8 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x1a4/0x9f0
 #1: ffffffff8ed5cbe0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
locks held by syz.4.5243/30882: 1, last CPU#1:
 #0: ffffffff8ed5cbe0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550

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

NMI backtrace for cpu 0
CPU: 0 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+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 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: 5517 Comm: sshd 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:asm_exc_page_fault+0x0/0x30
Code: 74 24 28 ff 74 24 28 ff 74 24 28 ff 74 24 28 ff 74 24 28 e8 82 07 00 00 48 89 c4 48 89 e7 e8 27 fa e4 0a e9 e2 08 00 00 90 90 <f3> 0f 1e fa 0f 1f 00 fc e8 63 07 00 00 48 89 c4 48 89 e7 48 8b 74
RSP: 0000:fffffe0000049fd0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 00005603239a2280 RCX: 0000000000027de0
RDX: ffffffffffffffff RSI: 00000000000ea200 RDI: 0000560323b51000
RBP: 00005603239907b0 R08: 00000000000ea200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000100
R13: 0000560323a8ebe0 R14: 00000000000ea200 R15: 0000000000001cac
FS:  00007fe74ddcb800(0000) GS:ffff8882a8ccc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560323b51000 CR3: 000000011369a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <ENTRY_TRAMPOLINE>
RIP: 0033:0x7fe74d92e92f
RSP: 002b:00007ffdb46c0498 EFLAGS: 00010246
 </ENTRY_TRAMPOLINE>
