INFO: task udevd:9444 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:26544 pid:9444  tgid:9444  ppid:5061   task_flags:0x400040 flags:0x00080802
Call Trace:
 <TASK>
 __schedule+0x17dd/0x5830
 schedule+0x164/0x2b0
 io_schedule+0x7f/0xd0
 folio_wait_bit_common+0x85e/0xc40
 do_read_cache_folio+0x1ac/0x590
 read_part_sector+0xb6/0x2b0
 adfspart_check_POWERTEC+0x9a/0x7a0
 bdev_disk_changed+0x851/0x1680
 blkdev_get_whole+0x372/0x510
 bdev_open+0x324/0xd70
 blkdev_open+0x461/0x600
 do_dentry_open+0x80e/0x1360
 vfs_open_consume+0x4a/0x350
 path_openat+0x16fc/0x20f0
 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: 0033:0x7f391e1589a4
RSP: 002b:00007ffdfdd4d9d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000056240e673b10 RCX: 00007f391e1589a4
RDX: 00000000000a0800 RSI: 000056240e6791c0 RDI: 00000000ffffff9c
RBP: 000056240e6791c0 R08: 0000000000000001 R09: 3fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000056240e663aa0 R14: 00007ffdfdd4da7c R15: 000056240e652910
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#1:
 #0: ffffffff8ff5a320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5440: 2, on CPU#1:
 #0: ffff8881007240a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900031192e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by kworker/u10:16/13549: 3, last CPU#1:
 #0: ffff8881000aa948 ((wq_completion)kvfree_rcu_reclaim){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000631fc40 ((work_completion)(&(&krcp->monitor_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff8ff5a440 (rcu_callback){....}-{0:0}, at: kvfree_rcu_bulk+0x6d/0x180
locks held by udevd/9444: 1, on CPU#1:
 #0: ffff88801469e350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70
locks held by kworker/u8:0/24293: 6, last CPU#0:
 #0: ffff888101321148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90008887c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff9148c460 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x116/0x15c0
 #3: ffffffff8ff5a320 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x203/0x1650
 #4: ffffffff8ff5a440 (rcu_callback){....}-{0:0}, at: rcu_core+0x8b0/0x1230
 #5: ffffffff8ff5a320 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550
locks held by syz.1.12010/26004: 1, last CPU#1:
 #0: ffff88811fcb2640 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x7a/0x1f0
locks held by syz.0.12016/26111: 2, last CPU#1:
 #0: ffff8881ad4a1bc0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x19c/0xa40
 #1: ffffffff8ff5a320 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0x1073/0x10f0
 kthread+0x38b/0x480
 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: 24293 Comm: kworker/u8:0 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: ipv6_addrconf addrconf_dad_work
RIP: 0010:unwind_next_frame+0x4e6/0x2550
Code: 00 49 89 d5 49 89 d7 4c 89 e0 4c 29 f8 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 49 8d 1c 47 48 89 d8 48 c1 e8 03 <48> b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 48 63 03 48
RSP: 0018:ffffc900000078c0 EFLAGS: 00000a02
RAX: 1ffffffff2380edc RBX: ffffffff91c076e0 RCX: 0000000000000009
RDX: ffffffff91c076d0 RSI: ffffffff92451d02 RDI: ffffffff8c8e8c20
RBP: ffffffff823fbfbb R08: 0000000000000016 R09: 0000000000000000
R10: ffffc900000079b8 R11: ffffffff81b3a880 R12: ffffffff91c076f4
R13: ffffffff91c076d0 R14: ffffc90000007968 R15: ffffffff91c076d0
FS:  0000000000000000(0000) GS:ffff88818c01f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a7a003990 CR3: 000000017a876000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x650
 ip6_dst_destroy+0x9a/0x380
 dst_destroy+0xcf/0x340
 rcu_core+0x92e/0x1230
 handle_softirqs+0x265/0x8d0
 do_softirq+0x77/0xd0
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140
 icmp6_dst_alloc+0x39b/0x430
 ndisc_send_skb+0x42f/0x1650
 addrconf_dad_completed+0x911/0xe60
 addrconf_dad_work+0xcf8/0x15c0
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
