INFO: task udevd:5061 blocked for more than 143 seconds. Not tainted 6.4.0-rc1-syzkaller-00012-g16a8829130ca #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:26952 pid:5061 ppid:4445 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 io_schedule+0xbe/0x130 kernel/sched/core.c:8979 folio_wait_bit_common+0x394/0x9b0 mm/filemap.c:1301 __folio_lock mm/filemap.c:1664 [inline] folio_lock include/linux/pagemap.h:955 [inline] folio_lock include/linux/pagemap.h:951 [inline] __filemap_get_folio+0x789/0x990 mm/filemap.c:1931 truncate_inode_pages_range+0x350/0xf10 mm/truncate.c:377 kill_bdev block/bdev.c:76 [inline] blkdev_flush_mapping+0x152/0x320 block/bdev.c:596 blkdev_put_whole+0xcb/0xf0 block/bdev.c:627 blkdev_put+0x220/0x780 block/bdev.c:887 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:871 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021 get_signal+0x2315/0x25b0 kernel/signal.c:2874 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+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4c7d1169a4 RSP: 002b:00007ffd8d5256d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: 0000000000000008 RBX: 0000560af73fa840 RCX: 00007f4c7d1169a4 RDX: 00000000000a0800 RSI: 0000560af73faf70 RDI: 00000000ffffff9c RBP: 0000560af73faf70 R08: 0000000000000001 R09: 00007ffd8d5ed080 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 R13: 0000560af73f7e00 R14: 0000000000000001 R15: 0000560af73ce2c0 INFO: task syz-executor.0:5128 blocked for more than 143 seconds. Not tainted 6.4.0-rc1-syzkaller-00012-g16a8829130ca #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28072 pid:5128 ppid:5109 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 blkdev_get_by_dev.part.0+0x95/0xb80 block/bdev.c:747 blkdev_get_by_dev+0x6f/0x90 block/bdev.c:790 blkdev_open+0x140/0x2d0 block/fops.c:493 do_dentry_open+0x6cc/0x13f0 fs/open.c:920 do_open fs/namei.c:3636 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3791 do_filp_open+0x1ba/0x410 fs/namei.c:3818 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1383 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: 0033:0x417734 RSP: 002b:00007f742d5b1c50 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000417734 RDX: 0000000000000000 RSI: 00007f742d5b1d70 RDI: 00000000ffffff9c RBP: 00007f742d5b1d70 R08: 0000000000000000 R09: 002364626e2f7665 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f742d5b26bc R14: 00000000ffffffff R15: 0000000000000003 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c795470 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c795170 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518 1 lock held by khungtaskd/27: #0: ffffffff8c796080 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6545 2 locks held by getty/4747: #0: ffff88814bd49098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900020182f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2176 1 lock held by udevd/5061: #0: ffff888140bf64c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xba/0x780 block/bdev.c:845 1 lock held by syz-executor.0/5128: #0: ffff888140bf64c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x95/0xb80 block/bdev.c:747 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 6.4.0-rc1-syzkaller-00012-g16a8829130ca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __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+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x40/0x50 drivers/acpi/processor_idle.c:112