INFO: task udevd:5141 blocked for more than 143 seconds.
      Not tainted 6.9.0-rc2-next-20240405-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:24528 pid:5141  tgid:5141  ppid:4535   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17e8/0x4a50 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 io_schedule+0x8d/0x110 kernel/sched/core.c:9044
 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307
 __filemap_get_folio+0xa3/0xbb0 mm/filemap.c:1898
 truncate_inode_pages_range+0x57e/0xfc0 mm/truncate.c:367
 kill_bdev block/bdev.c:85 [inline]
 blkdev_flush_mapping+0x156/0x2b0 block/bdev.c:644
 blkdev_put_whole block/bdev.c:675 [inline]
 bdev_release+0x489/0x720 block/bdev.c:1066
 blkdev_release+0x15/0x20 block/fops.c:628
 __fput+0x406/0x8b0 fs/file_table.c:422
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa1b/0x27e0 kernel/exit.c:878
 do_group_exit+0x207/0x2c0 kernel/exit.c:1027
 get_signal+0x16a1/0x1740 kernel/signal.c:2911
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218
 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7f535ed759a4
RSP: 002b:00007ffda5140c30 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: 0000000000000008 RBX: 000055ce0f258cb0 RCX: 00007f535ed759a4
RDX: 00000000000a0800 RSI: 000055ce0f247360 RDI: 00000000ffffff9c
RBP: 000055ce0f247360 R08: 0000000000000001 R09: 00007f535ef020b0
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055ce0f239b00 R14: 0000000000000001 R15: 000055ce0f230910
 </TASK>
INFO: task syz-executor.0:5210 blocked for more than 143 seconds.
      Not tainted 6.9.0-rc2-next-20240405-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:27352 pid:5210  tgid:5209  ppid:5190   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17e8/0x4a50 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 bdev_open+0xdd/0xcb0 block/bdev.c:868
 blkdev_open+0x20d/0x2e0 block/fops.c:620
 do_dentry_open+0x907/0x15f0 fs/open.c:955
 do_open fs/namei.c:3642 [inline]
 path_openat+0x289f/0x3280 fs/namei.c:3799
 do_filp_open+0x235/0x490 fs/namei.c:3826
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_openat fs/open.c:1437 [inline]
 __se_sys_openat fs/open.c:1432 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1432
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x454000
RSP: 002b:00007f7468a47c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000454000
RDX: 0000000000000000 RSI: 00007f7468a47cb0 RDI: 00000000ffffff9c
RBP: 00007f7468a47cb0 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000049f8fd
R13: 000000000000000b R14: 000000000054cf00 R15: 00007fff550392e8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e334ea0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e334ea0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e334ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by klogd/4524:
 #0: ffff8880b953e618 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
 #1: ffff888026353058 (&ei->socket.wq.wait){..-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
 #2: ffff88802f75e418 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
 #2: ffff88802f75e418 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
2 locks held by getty/4832:
 #0: ffff88802aab10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by udevd/5141:
 #0: ffff88802021c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x1c8/0x720 block/bdev.c:1050
1 lock held by syz-executor.0/5210:
 #0: ffff88802021c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xdd/0xcb0 block/bdev.c:868

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc2-next-20240405-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xfde/0x1020 kernel/hung_task.c:380
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4524 Comm: klogd Not tainted 6.9.0-rc2-next-20240405-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:unwind_next_frame+0xb7/0x2a00 arch/x86/kernel/unwind_orc.c:479
Code: 0f 85 6a 20 00 00 44 8b 75 00 31 ff 44 89 f6 e8 2f c1 54 00 44 89 b4 24 8c 00 00 00 45 85 f6 0f 84 8a 00 00 00 48 89 5c 24 50 <bf> 01 00 00 00 e8 8f 81 24 00 4c 89 e9 4c 8d 6d 50 4c 89 e8 48 c1
RSP: 0018:ffffc9000397f208 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc9000397f318 RCX: ffff888076e13c00
RDX: ffff888076e13c00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000397f2e0 R08: ffffffff8140d0c1 R09: ffffc9000397f3d0
R10: 0000000000000003 R11: ffffffff81816e70 R12: ffff888076e13c00
R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff81fa6968
FS:  00007f0b0d188380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005572b9e757f0 CR3: 000000007c32e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4078 [inline]
 kmalloc_node_track_caller_noprof+0x22a/0x440 mm/slub.c:4098
 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:599
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1313 [inline]
 alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6477
 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2795
 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:1973
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2199
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7f0b0d2ea9b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd070a61b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f0b0d2ea9b5
RDX: 000000000000004c RSI: 000055d15a88c2b0 RDI: 0000000000000003
RBP: 000055d15a887910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f0b0d478212 R14: 00007ffd070a62b8 R15: 0000000000000000
 </TASK>