block nbd0: shutting down sockets INFO: task syz-executor120:8104 blocked for more than 140 seconds. Not tainted 4.19.172-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor120 D27056 8104 8103 0x80000006 Call Trace: context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3619 __mutex_lock_common syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x647/0x1260 syzkaller/managers/linux-4-19/kernel/kernel/locking/mutex.c:1072 blkdev_put+0x30/0x520 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1839 blkdev_close+0x86/0xb0 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1888 __fput+0x2ce/0x890 syzkaller/managers/linux-4-19/kernel/fs/file_table.c:278 task_work_run+0x148/0x1c0 syzkaller/managers/linux-4-19/kernel/kernel/task_work.c:113 exit_task_work syzkaller/managers/linux-4-19/kernel/./include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 syzkaller/managers/linux-4-19/kernel/kernel/exit.c:870 do_group_exit+0x125/0x310 syzkaller/managers/linux-4-19/kernel/kernel/exit.c:967 get_signal+0x3f2/0x1f70 syzkaller/managers/linux-4-19/kernel/kernel/signal.c:2589 do_signal+0x8f/0x1670 syzkaller/managers/linux-4-19/kernel/arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:163 prepare_exit_to_usermode syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:198 [inline] syscall_return_slowpath syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x444589 Code: Bad RIP value. RSP: 002b:00007fff0bb505d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 00000000004004a0 RCX: 0000000000444589 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 0000000000000000 R08: 002364626e2f7665 R09: 00007fff0bb50778 R10: 000000000000001f R11: 0000000000000246 R12: 0000000000403610 R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0 INFO: task systemd-udevd:8107 blocked for more than 140 seconds. Not tainted 4.19.172-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26624 8107 4696 0x00000104 Call Trace: context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561 io_schedule+0xb5/0x120 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:5181 wait_on_page_bit_common syzkaller/managers/linux-4-19/kernel/mm/filemap.c:1123 [inline] wait_on_page_bit+0x2c5/0x3f0 syzkaller/managers/linux-4-19/kernel/mm/filemap.c:1156 wait_on_page_locked syzkaller/managers/linux-4-19/kernel/./include/linux/pagemap.h:530 [inline] wait_on_page_read syzkaller/managers/linux-4-19/kernel/mm/filemap.c:2795 [inline] do_read_cache_page+0x8ed/0x1170 syzkaller/managers/linux-4-19/kernel/mm/filemap.c:2834 read_mapping_page syzkaller/managers/linux-4-19/kernel/./include/linux/pagemap.h:402 [inline] read_dev_sector+0xbf/0x500 syzkaller/managers/linux-4-19/kernel/block/partition-generic.c:671 read_part_sector syzkaller/managers/linux-4-19/kernel/block/partitions/check.h:38 [inline] adfspart_check_ICS+0x114/0xe70 syzkaller/managers/linux-4-19/kernel/block/partitions/acorn.c:366 check_partition+0x390/0x690 syzkaller/managers/linux-4-19/kernel/block/partitions/check.c:167 rescan_partitions+0x1b5/0x970 syzkaller/managers/linux-4-19/kernel/block/partition-generic.c:535 bdev_disk_changed+0x179/0x1b0 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1435 __blkdev_get+0x1282/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1561 blkdev_get+0xb0/0x940 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1627 blkdev_open+0x202/0x290 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1788 do_dentry_open+0x4aa/0x1160 syzkaller/managers/linux-4-19/kernel/fs/open.c:796 do_last syzkaller/managers/linux-4-19/kernel/fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3537 do_filp_open+0x18c/0x3f0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3567 do_sys_open+0x3b3/0x520 syzkaller/managers/linux-4-19/kernel/fs/open.c:1085 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fc739183840 Code: Bad RIP value. RSP: 002b:00007fff1e368238 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055b62f67c5d0 RCX: 00007fc739183840 RDX: 000055b62e0e2fe3 RSI: 00000000000a0800 RDI: 000055b62f66dc20 RBP: 00007fff1e3683b0 R08: 000055b62e0e2670 R09: 0000000000000010 R10: 000055b62e0e2d0c R11: 0000000000000246 R12: 00007fff1e368300 R13: 000055b62f6828c0 R14: 0000000000000003 R15: 000000000000000e Showing all locks held in the system: 1 lock held by khungtaskd/1567: #0: 00000000cc2c8226 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:4440 1 lock held by in:imklog/7818: #0: 00000000cebb632f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 syzkaller/managers/linux-4-19/kernel/fs/file.c:767 1 lock held by syz-executor120/8104: #0: 0000000068289baa (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x520 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1839 1 lock held by systemd-udevd/8107: #0: 0000000068289baa (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 syzkaller/managers/linux-4-19/kernel/fs/block_dev.c:1478 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1567 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/linux-4-19/kernel/./include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:287 kthread+0x33f/0x460 syzkaller/managers/linux-4-19/kernel/kernel/kthread.c:259 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/irqflags.h:60