nbd0: unable to read partition table ldm_validate_partition_table(): Disk read failed. Dev nbd0: unable to read RDB block 0 nbd0: unable to read partition table block nbd0: shutting down sockets INFO: task systemd-udevd:6492 blocked for more than 140 seconds. Not tainted 4.19.150-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26184 6492 3729 0x00000100 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 io_schedule+0xb5/0x120 kernel/sched/core.c:5185 wait_on_page_bit_common mm/filemap.c:1123 [inline] wait_on_page_bit+0x312/0x4c0 mm/filemap.c:1156 wait_on_page_locked include/linux/pagemap.h:530 [inline] wait_on_page_read mm/filemap.c:2795 [inline] do_read_cache_page+0x905/0x11d0 mm/filemap.c:2834 read_mapping_page include/linux/pagemap.h:402 [inline] read_dev_sector+0xbf/0x520 block/partition-generic.c:671 read_part_sector block/partitions/check.h:38 [inline] adfspart_check_ICS+0x114/0xea0 block/partitions/acorn.c:366 check_partition+0x40f/0x86d block/partitions/check.c:167 rescan_partitions+0x14d/0x910 block/partition-generic.c:535 bdev_disk_changed+0x179/0x1b0 fs/block_dev.c:1435 __blkdev_get+0x128e/0x1490 fs/block_dev.c:1561 blkdev_get+0xb0/0x9b0 fs/block_dev.c:1627 blkdev_open+0x202/0x290 fs/block_dev.c:1788 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x7d5/0x2e90 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f074e8b8840 Code: Bad RIP value. RSP: 002b:00007ffec2a9c4e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055d298f44a30 RCX: 00007f074e8b8840 RDX: 000055d29871dfe3 RSI: 0000000000080000 RDI: 000055d298f57160 RBP: 0000000000000001 R08: 000055d29871d670 R09: 0000000000000110 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000055d298f45dd0 R15: 00000000ffffffff INFO: task syz-executor304:6496 blocked for more than 140 seconds. Not tainted 4.19.150-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor304 D28024 6496 6487 0x80000006 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x6a9/0x13f0 kernel/locking/mutex.c:1072 blkdev_put+0x30/0x550 fs/block_dev.c:1839 blkdev_close+0x86/0xb0 fs/block_dev.c:1888 __fput+0x2ce/0x8a0 fs/file_table.c:278 task_work_run+0x141/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xc09/0x2d80 kernel/exit.c:887 do_group_exit+0x125/0x320 kernel/exit.c:990 get_signal+0x3f3/0x2270 kernel/signal.c:2588 do_signal+0x8f/0x1690 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x57c/0x670 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445039 Code: Bad RIP value. RSP: 002b:00007ffe152eb988 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000445039 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 RBP: 000000000008a2d6 R08: 00000000004002e0 R09: 00000000004002e0 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402200 R13: 0000000000402290 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1092: #0: 00000000d87dd293 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x291 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6165: #0: 0000000031b47300 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767 1 lock held by systemd-udevd/6492: #0: 000000009506c922 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1490 fs/block_dev.c:1478 1 lock held by syz-executor304/6496: #0: 000000009506c922 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x550 fs/block_dev.c:1839 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1092 Comm: khungtaskd Not tainted 4.19.150-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x22c/0x33e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x18/0x3d lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xa62/0x1020 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3720 Comm: systemd-journal Not tainted 4.19.150-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_smp_processor_id+0x5/0x20 lib/smp_processor_id.c:56 Code: fe e9 68 fe ff ff 48 89 de 48 c7 c7 00 4a 18 8a e8 c0 7b 13 00 e9 18 fe ff ff 90 66 2e 0f 1f 84 00 00 00 00 00 e8 4b 2c cf fd <48> c7 c6 00 f3 51 88 48 c7 c7 40 f3 51 88 e9 38 fd ff ff 0f 1f 84 RSP: 0018:ffff888093cdf9b0 EFLAGS: 00000093 RAX: ffff888093cd2240 RBX: ffffffff8a172e60 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff83a2a615 RDI: ffff888093cd2ac4 RBP: ffff888093cd2240 R08: 0000000000000001 R09: fffff9400051ae96 R10: ffffea00028d74b7 R11: dffffc0000000000 R12: 0000000000000001 R13: ffffea00028d7488 R14: ffffea00028d7488 R15: ffffea00028d7480 FS: 00007f7f3100c8c0(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7f2e3c2000 CR3: 00000000943ba000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:348 [inline] rcu_is_watching+0xe/0x100 kernel/rcu/tree.c:1025 rcu_read_lock_sched_held+0xc6/0x1e0 kernel/rcu/update.c:113 trace_mm_page_free include/trace/events/kmem.h:151 [inline] free_pages_prepare mm/page_alloc.c:1015 [inline] __free_pages_ok+0xa81/0xe00 mm/page_alloc.c:1278 slab_destroy mm/slab.c:1713 [inline] slabs_destroy+0x8b/0xc0 mm/slab.c:1729 cache_flusharray mm/slab.c:3490 [inline] ___cache_free+0x2c3/0x420 mm/slab.c:3532 qlink_free mm/kasan/quarantine.c:147 [inline] qlist_free_all+0x79/0x170 mm/kasan/quarantine.c:166 quarantine_reduce+0x1ca/0x260 mm/kasan/quarantine.c:259 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:538 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x114/0x4a0 mm/slab.c:3557 getname_flags+0xce/0x590 fs/namei.c:140 do_sys_open+0x26c/0x520 fs/open.c:1079 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f7f3059c840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffde78ffb78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffde78ffe80 RCX: 00007f7f3059c840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000564d079bf6b0 RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000564d079b3060 R14: 00007ffde78ffe40 R15: 0000564d079bdd90