INFO: task udevd:6062 blocked for more than 143 seconds. Not tainted 6.2.0-rc7-syzkaller-17907-g2d3827b3f393 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:6062 ppid:3942 flags:0x00000000 Call trace: __switch_to+0x210/0x424 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5293 [inline] __schedule+0x6a4/0xb34 kernel/sched/core.c:6606 schedule+0x64/0xa4 kernel/sched/core.c:6682 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6741 __mutex_lock_common+0x964/0xf64 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 blkdev_get_by_dev+0x100/0x4e0 block/bdev.c:813 blkdev_open+0x84/0xd8 block/fops.c:478 do_dentry_open+0x36c/0x750 fs/open.c:882 vfs_open+0x38/0x48 fs/open.c:1013 do_open fs/namei.c:3557 [inline] path_openat+0xee4/0x1330 fs/namei.c:3714 do_filp_open+0xd0/0x1a8 fs/namei.c:3741 do_sys_openat2+0xb8/0x22c fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x64/0x178 arch/arm64/kernel/syscall.c:52 el0_svc_common+0xbc/0x180 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x110 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x14c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 INFO: task syz-executor.2:15415 blocked for more than 143 seconds. Not tainted 6.2.0-rc7-syzkaller-17907-g2d3827b3f393 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:0 pid:15415 ppid:4467 flags:0x0000000c Call trace: __switch_to+0x210/0x424 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5293 [inline] __schedule+0x6a4/0xb34 kernel/sched/core.c:6606 schedule+0x64/0xa4 kernel/sched/core.c:6682 io_schedule+0x38/0x60 kernel/sched/core.c:8868 folio_wait_bit_common+0x3d8/0x8e8 mm/filemap.c:1297 __folio_lock mm/filemap.c:1660 [inline] folio_lock include/linux/pagemap.h:938 [inline] __filemap_get_folio+0x38c/0xa68 mm/filemap.c:1932 truncate_inode_pages_range+0x240/0x91c mm/truncate.c:377 truncate_inode_pages+0x2c/0x3c mm/truncate.c:448 kill_bdev block/bdev.c:76 [inline] blkdev_flush_mapping+0x90/0x190 block/bdev.c:662 blkdev_put_whole block/bdev.c:693 [inline] blkdev_put+0x24c/0x374 block/bdev.c:953 blkdev_close+0x24/0x38 block/fops.c:492 __fput+0x198/0x3e4 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x100/0x148 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x294/0xc24 kernel/exit.c:867 do_group_exit+0x98/0xcc kernel/exit.c:1012 get_signal+0xc90/0xd60 kernel/signal.c:2859 do_signal arch/arm64/kernel/signal.c:1246 [inline] do_notify_resume+0x1d4/0x2628 arch/arm64/kernel/signal.c:1299 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x14c arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/11: #0: ffff80000d4955c8 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x448 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/12: #0: ffff80000d495c18 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x448 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/27: #0: ffff80000d4954a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:324 2 locks held by getty/4093: #0: ffff0000c66e9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x28/0x58 drivers/tty/tty_ldisc.c:244 #1: ffff80000f6a62f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x28c/0xbc4 drivers/tty/n_tty.c:2177 2 locks held by kworker/u4:8/5507: 1 lock held by udevd/6062: #0: ffff0000c4b85cc8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x100/0x4e0 block/bdev.c:813 1 lock held by syz-executor.2/15415: #0: ffff0000c4b85cc8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x78/0x374 block/bdev.c:911 1 lock held by syz-executor.2/15560: #0: ffff0000c4b85cc8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x100/0x4e0 block/bdev.c:813 1 lock held by syz-executor.2/15561: #0: ffff0000c4b85cc8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x100/0x4e0 block/bdev.c:813 3 locks held by kworker/1:22/16737: #0: ffff0000c0012738 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x274/0x9d0 kernel/workqueue.c:2262 #1: ffff800014fb3d80 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x2a0/0x9d0 kernel/workqueue.c:2264 #2: ffff00011e6e9240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0xa4/0x1240 drivers/net/netdevsim/fib.c:1489 1 lock held by syz-executor.0/17913: 1 lock held by syz-executor.4/17915: 1 lock held by syz-executor.1/17907: #0: ffff00012e9360e0 (&type->s_umount_key#63/1){+.+.}-{3:3}, at: alloc_super+0xf8/0x430 fs/super.c:228 1 lock held by syz-executor.2/17917: =============================================