syzbot

INFO: task udevd:5103 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc3-syzkaller-00317-g65aca32efdcb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:26256 pid:5103  ppid:4434   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0xc91/0x5770 kernel/sched/core.c:6622
 schedule+0xde/0x1a0 kernel/sched/core.c:6698
 io_schedule+0xbe/0x130 kernel/sched/core.c:8884
 folio_wait_bit_common+0x394/0x9b0 mm/filemap.c:1301
 __folio_lock mm/filemap.c:1664 [inline]
 folio_lock include/linux/pagemap.h:952 [inline]
 folio_lock include/linux/pagemap.h:948 [inline]
 __filemap_get_folio+0xbab/0xdc0 mm/filemap.c:1936
 truncate_inode_pages_range+0x350/0xec0 mm/truncate.c:377
 kill_bdev block/bdev.c:76 [inline]
 blkdev_flush_mapping+0x140/0x310 block/bdev.c:584
 blkdev_put_whole+0xd1/0xf0 block/bdev.c:615
 blkdev_put+0x224/0x770 block/bdev.c:875
 blkdev_close+0x68/0x80 block/fops.c:507
 __fput+0x27c/0xa90 fs/file_table.c:321
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xad3/0x2960 kernel/exit.c:869
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1019
 get_signal+0x2315/0x25b0 kernel/signal.c:2859
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1574b25697
RSP: 002b:00007ffe47d829b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: 0000000000000008 RBX: 0000565457ce1310 RCX: 00007f1574b25697
RDX: 00000000000a0800 RSI: 0000565457ce1780 RDI: 00000000ffffff9c
RBP: 0000565457ce1780 R08: 0000000000000001 R09: 00007ffe47db6080
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 0000565457d1b8e0 R14: 00007ffe47d82a5c R15: 0000565457cd52c0
 </TASK>
INFO: task syz-executor360:5111 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc3-syzkaller-00317-g65aca32efdcb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor360 state:D stack:28496 pid:5111  ppid:5098   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0xc91/0x5770 kernel/sched/core.c:6622
 schedule+0xde/0x1a0 kernel/sched/core.c:6698
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747
 blkdev_get_by_dev.part.0+0x9b/0xb80 block/bdev.c:735
 blkdev_get_by_dev+0x6f/0x90 block/bdev.c:778
 blkdev_open+0x140/0x2c0 block/fops.c:493
 do_dentry_open+0x6cc/0x13f0 fs/open.c:920
 do_open fs/namei.c:3560 [inline]
 path_openat+0x1baa/0x2750 fs/namei.c:3715
 do_filp_open+0x1ba/0x410 fs/namei.c:3742
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1375
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7efc3fbcdc24
RSP: 002b:00007efc3fbbde70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efc3fbcdc24
RDX: 0000000000000000 RSI: 00007efc3fbbdef0 RDI: 00000000ffffff9c
RBP: 00007efc3fbbdef0 R08: 0000000000000000 R09: 00007efc3fbbe700
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007efc3fc621a4 R14: 64626e2f7665642f R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/11:
 #0: ffffffff8c791bb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/12:
 #0: ffffffff8c7918b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/27:
 #0: ffffffff8c792700 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495
2 locks held by getty/4746:
 #0: ffff88814b6ec098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc900020482f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
1 lock held by udevd/5103:
 #0: ffff88801eae04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xc0/0x770 block/bdev.c:833
1 lock held by syz-executor360/5111:
 #0: ffff88801eae04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb80 block/bdev.c:735

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.3.0-rc3-syzkaller-00317-g65aca32efdcb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xe16/0x1090 kernel/hung_task.c:379
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x40/0x50 drivers/acpi/processor_idle.c:112