ldm_validate_partition_table(): Disk read failed. Dev nbd0: unable to read RDB block 0 nbd0: unable to read partition table block nbd0: Device being setup by another task block nbd0: shutting down sockets INFO: task syz-executor134:8014 blocked for more than 140 seconds. Not tainted 4.14.203-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor134 D28912 8014 8004 0x80000006 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __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 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa08/0x27f0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:962 get_signal+0x38d/0x1ca0 kernel/signal.c:2423 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 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: 0033:0x445039 RSP: 002b:00007ffc1bec52c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000445039 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 RBP: 00000000000c223b R08: 00000000004002e0 R09: 00000000004002e0 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402200 R13: 0000000000402290 R14: 0000000000000000 R15: 0000000000000000 INFO: task systemd-udevd:8017 blocked for more than 140 seconds. Not tainted 4.14.203-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D27464 8017 4632 0x00000104 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 io_schedule+0xb5/0x120 kernel/sched/core.c:5036 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:526 [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+0x330/0x60a 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: 0033:0x7f84c8e85840 RSP: 002b:00007fffdbb8a908 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000555769650500 RCX: 00007f84c8e85840 RDX: 000055576795afe3 RSI: 00000000000a0800 RDI: 0000555769641b80 RBP: 00007fffdbb8aa80 R08: 000055576795a670 R09: 0000000000000010 R10: 000055576795ad0c R11: 0000000000000246 R12: 00007fffdbb8a9d0 R13: 00005557696534b0 R14: 0000000000000003 R15: 000000000000000e Showing all locks held in the system: 1 lock held by khungtaskd/1530: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor134/8014: #0: (&bdev->bd_mutex){+.+.}, at: [] blkdev_put+0x27/0x4c0 fs/block_dev.c:1826 1 lock held by systemd-udevd/8017: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1530 Comm: khungtaskd Not tainted 4.14.203-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+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f 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 CPU: 0 PID: 4622 Comm: systemd-journal Not tainted 4.14.203-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a11320c0 task.stack: ffff8880a1138000 RIP: 0010:memcmp+0x3e/0xb0 lib/string.c:885 RSP: 0018:ffff8880a113faa8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff8880a113fb84 RCX: 0000000000000003 RDX: 0000000000000004 RSI: ffff8880a4355784 RDI: ffff8880a113fb48 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a11320c0 R12: ffff8880a113fb90 R13: 0000000000000009 R14: ffff8880a113fb48 R15: ffff8880a4355730 FS: 00007f99061a68c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9903585000 CR3: 00000000a145e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_stack lib/stackdepot.c:180 [inline] depot_save_stack+0x10d/0x3e3 lib/stackdepot.c:229 save_stack mm/kasan/kasan.c:453 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0x139/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc_trace+0x11b/0x3d0 mm/slab.c:3616 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] aa_alloc_task_context+0x4d/0x90 security/apparmor/context.c:40 apparmor_cred_prepare+0x1a/0xb0 security/apparmor/lsm.c:84 security_prepare_creds+0x76/0xb0 security/security.c:1008 prepare_creds+0x2ef/0x490 kernel/cred.c:282 SYSC_faccessat fs/open.c:365 [inline] SyS_faccessat+0x7b/0x680 fs/open.c:353 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f99054629c7 RSP: 002b:00007ffd4c9e7df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffd4c9eae20 RCX: 00007f99054629c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000556dd21849a3 RBP: 00007ffd4c9e7f40 R08: 0000556dd217a3e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000556dd25e88a0 R15: 00007ffd4c9e8430 Code: fc ff df 53 48 89 fb 48 83 ec 10 eb 0d 48 83 c3 01 48 83 c6 01 49 39 dc 74 45 48 89 d8 48 89 da 48 c1 e8 03 83 e2 07 0f b6 04 28 <38> d0 7f 04 84 c0 75 54 48 89 f2 48 89 f1 0f b6 03 48 c1 ea 03