INFO: task udevd:5603 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:25960 pid:5603  tgid:5603  ppid:5052   task_flags:0x400140 flags:0x00080802
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 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+0x2e44/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3b225169a4
RSP: 002b:00007fffd0ae7290 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000564682e61220 RCX: 00007f3b225169a4
RDX: 00000000000a0800 RSI: 0000564682e4dec0 RDI: 00000000ffffff9c
RBP: 0000564682e4dec0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 0000564682e57950 R14: 0000000000000001 R15: 0000564682e40910
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e959c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5432:
 #0: ffff88816049d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
1 lock held by udevd/5603:
 #0: ffff888106719350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70
5 locks held by kworker/u8:6/6062:
2 locks held by syz.2.4778/23169:

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

NMI backtrace for cpu 0
CPU: 0 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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 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: 23 Comm: ksoftirqd/1 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:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 40 68 43 0a cc 89 f6 31 d2 e9 f6 e6 81 03 66 0f 1f 44 00
RSP: 0018:ffffc900001d66f0 EFLAGS: 00000046
RAX: 0000000000027ed6 RBX: ffff88823c623c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 0000000000027ed6 RDI: 0000000000000838
RBP: ffffc900001d67b0 R08: ffffffff81b358d5 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff81743530 R12: 0000000000027ed6
R13: dffffc0000000000 R14: 00000000100035af R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff8882a9221000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a603ee6b8 CR3: 000000011732e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x26c/0x420
 irqentry_exit+0x8b7/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 ad 3c ea f5 f7 c3 00 02 00 00 74 05 e8 10 21 16 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> b4 52 db f5 65 8b 05 ad 72 87 07 85 c0 74 18 5b 41 5e e9 91 48
RSP: 0018:ffffc900001d6908 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000302
RDX: 0000000000000002 RSI: ffffffff8dfe5a0d RDI: 0000000000000001
RBP: ffffc900001d6ac8 R08: ffffffff903306f7 R09: 1ffffffff20660de
R10: dffffc0000000000 R11: fffffbfff20660df R12: 0000006626c8b7ea
R13: ffff88810b8e5140 R14: ffff88823c6281c0 R15: 1ffff1102171ca28
 netem_dequeue+0x13cb/0x15e0
 __qdisc_run+0x24c/0x1620
 __dev_queue_xmit+0x1c00/0x37f0
 ip6_output+0x337/0x540
 synproxy_send_tcp_ipv6+0x549/0x700
 synproxy_send_client_synack_ipv6+0x83f/0xcd0
 nft_synproxy_eval_v6+0x362/0x4e0
 nft_synproxy_do_eval+0x3d1/0x550
 nft_do_chain+0x48d/0x1b10
 nft_do_chain_inet+0x360/0x4b0
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x21f/0x3c0
 ip6_input+0x16a/0x270
 NF_HOOK+0x336/0x3c0
 process_backlog+0x774/0x1860
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x225/0x840
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x57c/0xa80
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
