block nbd1: shutting down sockets block nbd0: Device being setup by another task block nbd0: Receive control failed (result -32) block nbd0: shutting down sockets block nbd3: shutting down sockets INFO: task systemd-udevd:22979 blocked for more than 140 seconds. Not tainted 4.14.282-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D27464 22979 4631 0x00000300 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 io_schedule+0xb5/0x120 kernel/sched/core.c:5035 wait_on_page_bit_common mm/filemap.c:1025 [inline] wait_on_page_bit+0x241/0x320 mm/filemap.c:1058 wait_on_page_locked include/linux/pagemap.h:527 [inline] wait_on_page_read mm/filemap.c:2680 [inline] do_read_cache_page+0x55f/0xc10 mm/filemap.c:2719 read_mapping_page include/linux/pagemap.h:398 [inline] read_dev_sector+0xbd/0x3c0 block/partition-generic.c:659 read_part_sector block/partitions/check.h:38 [inline] adfspart_check_ICS+0xf6/0xc00 block/partitions/acorn.c:366 check_partition+0x330/0x610 block/partitions/check.c:167 rescan_partitions+0x192/0x800 block/partition-generic.c:523 __blkdev_get+0xd7f/0x1090 fs/block_dev.c:1541 blkdev_get+0x88/0x890 fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f45dde95840 RSP: 002b:00007ffe8bd8d878 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000561333c7c5c0 RCX: 00007f45dde95840 RDX: 0000561331cedfe3 RSI: 00000000000a0800 RDI: 0000561333c7b6f0 RBP: 00007ffe8bd8d9f0 R08: 0000561331ced670 R09: 0000000000000010 R10: 0000561331cedd0c R11: 0000000000000246 R12: 00007ffe8bd8d940 R13: 0000561333c7c3b0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.3:22992 blocked for more than 140 seconds. Not tainted 4.14.282-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28912 22992 8007 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 blkdev_put+0x27/0x4c0 fs/block_dev.c:1826 blkdev_close+0x86/0xb0 fs/block_dev.c:1875 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe0da6b3d4b RSP: 002b:00007ffc5e9dfa70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007fe0da6b3d4b RDX: 0000001b2fe20000 RSI: 0000001b2fe21c5c RDI: 0000000000000004 RBP: 00007fe0da815960 R08: 0000000000000000 R09: 00000000748f6f19 R10: 000b88a0babb003b R11: 0000000000000293 R12: 0000000000138d6a R13: 00007ffc5e9dfb70 R14: 00007ffc5e9dfb90 R15: 0000000000000032 Showing all locks held in the system: 1 lock held by khungtaskd/1526: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by systemd-udevd/22979: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 1 lock held by syz-executor.3/22992: #0: (&bdev->bd_mutex){+.+.}, at: [] blkdev_put+0x27/0x4c0 fs/block_dev.c:1826 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1526 Comm: khungtaskd Not tainted 4.14.282-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff87246dce