INFO: task udevd:5636 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:22144 pid:5636  tgid:5636  ppid:4985   task_flags:0x400140 flags:0x00080802
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7283
 io_schedule+0x8a/0xf0 kernel/sched/core.c:8110
 folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1324
 folio_put_wait_locked mm/filemap.c:1493 [inline]
 do_read_cache_folio+0x3bc/0x6b0 mm/filemap.c:4089
 read_mapping_folio include/linux/pagemap.h:1017 [inline]
 read_part_sector+0xd1/0x370 block/partitions/core.c:724
 adfspart_check_POWERTEC+0x8a/0x630 block/partitions/acorn.c:450
 check_partition block/partitions/core.c:143 [inline]
 blk_add_partitions block/partitions/core.c:591 [inline]
 bdev_disk_changed+0x7a3/0x1250 block/partitions/core.c:695
 blkdev_get_whole+0x187/0x290 block/bdev.c:756
 bdev_open+0x2c7/0xe40 block/bdev.c:965
 blkdev_open+0x34e/0x4f0 block/fops.c:697
 do_dentry_open+0x6ab/0x14d0 fs/open.c:947
 vfs_open+0x82/0x3f0 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x208c/0x31a0 fs/namei.c:4858
 do_file_open+0x20e/0x430 fs/namei.c:4887
 do_sys_openat2+0x10d/0x1e0 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb64fea7407
RSP: 002b:00007ffe4e6a58b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb6505ba880 RCX: 00007fb64fea7407
RDX: 00000000000a0800 RSI: 000055e92bb4c700 RDI: ffffffffffffff9c
RBP: 000055e92bb492c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055e92bd944e0
R13: 000055e92bd848d0 R14: 0000000000000000 R15: 000055e92bd944e0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e7e5620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8e7e5620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e7e5620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
2 locks held by getty/5373:
 #0: ffff888038f470a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14f0 drivers/tty/n_tty.c:2211
1 lock held by udevd/5636:
 #0: ffff888028773350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:953
3 locks held by kworker/0:7/5733:
1 lock held by syz.5.2825/15558:
 #0: ffff888061e640a0 (&kvm->slots_lock){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
 #0: ffff888061e640a0 (&kvm->slots_lock){+.+.}-{4:4}, at: kvm_vm_ioctl_set_memory_region virt/kvm/kvm_main.c:2146 [inline]
 #0: ffff888061e640a0 (&kvm->slots_lock){+.+.}-{4:4}, at: kvm_vm_ioctl+0x1ddf/0x4050 virt/kvm/kvm_main.c:5201

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15553 Comm: syz.0.2828 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:put_cmsg+0x7e/0x5d0 net/core/scm.c:262
Code: 00 00 44 8b 6b 44 31 ff 44 89 ee e8 3c 0d ad f8 45 85 ed 0f 88 8a 04 00 00 e8 7e 12 ad f8 48 8d 43 38 48 89 c2 48 89 44 24 08 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 ae 04
RSP: 0018:ffffc9000db277e8 EFLAGS: 00000246
RAX: ffffc9000db27db0 RBX: ffffc9000db27d78 RCX: ffffc90004b9a000
RDX: ffffc9000db27db0 RSI: ffffffff895b7ea2 RDI: ffff888027742540
RBP: ffff88802f2ac5a8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000000 R12: ffffc9000db278e8
R13: 0000000000000008 R14: ffff88802f2ac3d0 R15: 0000000000000042
FS:  00007fd5e289e6c0(0000) GS:ffff888124386000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b308f5ff8 CR3: 00000000801be000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rxrpc_recvmsg_term net/rxrpc/recvmsg.c:93 [inline]
 rxrpc_recvmsg+0x1a50/0x1ff0 net/rxrpc/recvmsg.c:571
 sock_recvmsg_nosec net/socket.c:1137 [inline]
 ____sys_recvmsg+0x5b3/0x640 net/socket.c:2916
 ___sys_recvmsg+0x16a/0x1a0 net/socket.c:2960
 do_recvmmsg+0x301/0x760 net/socket.c:3055
 __sys_recvmmsg net/socket.c:3129 [inline]
 __do_sys_recvmmsg net/socket.c:3152 [inline]
 __se_sys_recvmmsg net/socket.c:3145 [inline]
 __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3145
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd5e199ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd5e289e028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fd5e1c15fa0 RCX: 00007fd5e199ce59
RDX: 000000000000f000 RSI: 0000200000000d00 RDI: 0000000000000003
RBP: 00007fd5e1a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd5e1c16038 R14: 00007fd5e1c15fa0 R15: 00007ffed79e9e38
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	44 8b 6b 44          	mov    0x44(%rbx),%r13d
   6:	31 ff                	xor    %edi,%edi
   8:	44 89 ee             	mov    %r13d,%esi
   b:	e8 3c 0d ad f8       	call   0xf8ad0d4c
  10:	45 85 ed             	test   %r13d,%r13d
  13:	0f 88 8a 04 00 00    	js     0x4a3
  19:	e8 7e 12 ad f8       	call   0xf8ad129c
  1e:	48 8d 43 38          	lea    0x38(%rbx),%rax
  22:	48 89 c2             	mov    %rax,%rdx
  25:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
* 2a:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax <-- trapping instruction
  31:	fc ff df
  34:	48 c1 ea 03          	shr    $0x3,%rdx
  38:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  3c:	0f                   	.byte 0xf
  3d:	85                   	.byte 0x85
  3e:	ae                   	scas   %es:(%rdi),%al
  3f:	04                   	.byte 0x4