INFO: task syz-executor.0:3618 blocked for more than 430 seconds. Not tainted 6.15.0-rc2-syzkaller-g1a1d569a75f3 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:3618 tgid:3617 ppid:3477 task_flags:0x400140 flags:0x0000000d Call trace: __switch_to+0x204/0x4bc arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0xd34/0x3188 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6860 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6917 __mutex_lock_common kernel/locking/mutex.c:678 [inline] __mutex_lock+0x5d8/0x9d8 kernel/locking/mutex.c:746 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:798 bdev_release+0x104/0x510 block/bdev.c:1090 blkdev_release+0x14/0x24 block/fops.c:660 __fput+0x2c8/0x954 fs/file_table.c:465 ____fput+0x14/0x20 fs/file_table.c:493 task_work_run+0x128/0x210 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1d0/0x258 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0x100/0x180 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 INFO: task syz-executor.0:3618 is blocked on a mutex likely owned by task udevd:3590. task:udevd state:D stack:0 pid:3590 tgid:3590 ppid:3121 task_flags:0x400140 flags:0x0000000d Call trace: __switch_to+0x204/0x4bc arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0xd34/0x3188 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6860 io_schedule+0xac/0x114 kernel/sched/core.c:7742 folio_wait_bit_common+0x2a8/0x634 mm/filemap.c:1317 folio_put_wait_locked mm/filemap.c:1481 [inline] do_read_cache_folio+0x240/0x480 mm/filemap.c:3866 read_cache_folio+0x44/0x6c mm/filemap.c:3916 read_mapping_folio include/linux/pagemap.h:995 [inline] read_part_sector+0xac/0x5f4 block/partitions/core.c:722 msdos_partition+0xe4/0x1f3c block/partitions/msdos.c:592 check_partition block/partitions/core.c:141 [inline] blk_add_partitions block/partitions/core.c:589 [inline] bdev_disk_changed+0x508/0xf0c block/partitions/core.c:693 blkdev_get_whole+0x144/0x1e4 block/bdev.c:710 bdev_open+0x1dc/0xa84 block/bdev.c:919 blkdev_open+0x1d4/0x318 block/fops.c:652 do_dentry_open+0x6f8/0x153c fs/open.c:956 vfs_open+0x5c/0x2fc fs/open.c:1086 do_open fs/namei.c:3845 [inline] path_openat+0x14ec/0x25e4 fs/namei.c:4004 do_filp_open+0x184/0x360 fs/namei.c:4031 do_sys_openat2+0xe0/0x160 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __arm64_sys_openat+0x12c/0x1bc fs/open.c:1455 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by rcu_preempt/15: #0: ffff00006a0b9fd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:605 [inline] #0: ffff00006a0b9fd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1513 [inline] #0: ffff00006a0b9fd8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1837 [inline] #0: ffff00006a0b9fd8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x318/0x3188 kernel/sched/core.c:6691 1 lock held by khungtaskd/33: #0: ffff80008728da60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6758 1 lock held by syslogd/3106: 2 locks held by getty/3240: #0: ffff0000180030a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d50b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e4/0xdb4 drivers/tty/n_tty.c:2222 1 lock held by udevd/3590: #0: ffff000014483358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:907 1 lock held by syz-executor.0/3618: #0: ffff000014483358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x104/0x510 block/bdev.c:1090 1 lock held by syz-executor.0/3689: #0: ffff000014483358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:907 1 lock held by syz-executor.0/3759: #0: ffff000014483358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:907 1 lock held by syz-executor.0/3834: #0: ffff000014483358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:907 1 lock held by syz-executor.0/3905: #0: ffff000014483358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:907 =============================================