ISOFS: Unable to identify CD-ROM format. ISOFS: Unable to identify CD-ROM format. ISOFS: Unable to identify CD-ROM format. ISOFS: Unable to identify CD-ROM format. ISOFS: Unable to identify CD-ROM format. INFO: task systemd-udevd:6724 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28256 6724 3641 0x00000100 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 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+0x5f0/0x1430 kernel/locking/mutex.c:893 __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 blkdev_get+0x84/0x8a0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 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+0xb68/0x2aa0 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x292/0x3e0 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f8bf3428840 RSP: 002b:00007ffed30aee48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00005651490f92f0 RCX: 00007f8bf3428840 RDX: 000056514811efe3 RSI: 00000000000a0800 RDI: 00005651490ff990 RBP: 00007ffed30aefc0 R08: 000056514811e670 R09: 0000000000000010 R10: 000056514811ed0c R11: 0000000000000246 R12: 00007ffed30aef10 R13: 00005651490f5d10 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor562:7879 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor562 D28928 7879 6341 0x80000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 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+0x5f0/0x1430 kernel/locking/mutex.c:893 lo_ioctl+0x87/0x1c00 drivers/block/loop.c:1414 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x91d/0x17c0 block/ioctl.c:594 ioctl_by_bdev+0xa0/0x110 fs/block_dev.c:2066 isofs_get_last_session fs/isofs/inode.c:571 [inline] isofs_fill_super+0x1cb5/0x25b0 fs/isofs/inode.c:670 mount_bdev+0x2b3/0x360 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x25e0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4485ea RSP: 002b:00007ffd5afd7b88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000018a4914 RCX: 00000000004485ea RDX: 00007ffd5afd7bd0 RSI: 0000000020000140 RDI: 00007ffd5afd7bf0 RBP: 00000000000ad066 R08: 00007ffd5afd7c30 R09: 00000000000ad066 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000402da0 R13: 0000000000402e30 R14: 0000000000000004 R15: 0000000000000000 INFO: task syz-executor562:7881 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor562 D28848 7881 6346 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1fc/0x380 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x45/0xa0 kernel/locking/rwsem.c:26 __get_super.part.0+0x1c6/0x280 fs/super.c:678 __get_super include/linux/spinlock.h:317 [inline] get_super+0x2b/0x50 fs/super.c:707 fsync_bdev+0x14/0xd0 fs/block_dev.c:495 invalidate_partition+0x31/0x60 block/genhd.c:1506 drop_partitions block/partition-generic.c:442 [inline] rescan_partitions+0xe1/0x860 block/partition-generic.c:515 __blkdev_reread_part+0x140/0x1d0 block/ioctl.c:173 blkdev_reread_part+0x23/0x40 block/ioctl.c:193 loop_reread_partitions+0x72/0x80 drivers/block/loop.c:624 loop_set_status+0xbfd/0x11f0 drivers/block/loop.c:1193 loop_set_status_old+0x1f5/0x2c0 drivers/block/loop.c:1301 lo_ioctl+0x9a9/0x1c00 drivers/block/loop.c:1431 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x91d/0x17c0 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1881 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x445c69 RSP: 002b:00007ffd5afd7d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445c69 RDX: 0000000020000540 RSI: 0000000000004c02 RDI: 0000000000000003 RBP: 00000000000ad0b7 R08: 00000000000ad0b7 R09: 0000000000402e30 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402da0 R13: 0000000000402e30 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor562:7886 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor562 D28928 7886 6343 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 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+0x5f0/0x1430 kernel/locking/mutex.c:893 __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 blkdev_get+0x84/0x8a0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 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+0xb68/0x2aa0 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x292/0x3e0 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x401aa0 RSP: 002b:00007ffd5afd7928 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000401aa0 RDX: 0000000000000000 RSI: 00000000000a0141 RDI: 00007ffd5afd7940 RBP: 00000000000ad0e5 R08: 000000000000000f R09: 00000000000ad0e5 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000402da0 R13: 0000000000402e30 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor562:7887 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor562 D28928 7887 6344 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 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+0x5f0/0x1430 kernel/locking/mutex.c:893 __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 blkdev_get+0x84/0x8a0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 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+0xb68/0x2aa0 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x292/0x3e0 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x401aa0 RSP: 002b:00007ffd5afd7928 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000401aa0 RDX: 0000000000000000 RSI: 00000000000a0141 RDI: 00007ffd5afd7940 RBP: 00000000000ad130 R08: 000000000000000f R09: 00000000000ad130 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000402da0 R13: 0000000000402e30 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor562:7891 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor562 D28928 7891 6342 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 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+0x5f0/0x1430 kernel/locking/mutex.c:893 __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 blkdev_get+0x84/0x8a0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 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+0xb68/0x2aa0 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x292/0x3e0 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x401aa0 RSP: 002b:00007ffd5afd7928 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000401aa0 RDX: 0000000000000000 RSI: 00000000000a0141 RDI: 00007ffd5afd7940 RBP: 00000000000ad14e R08: 000000000000000f R09: 00000000000ad14e R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000402da0 R13: 0000000000402e30 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor562:7902 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor562 D28928 7902 6345 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 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+0x5f0/0x1430 kernel/locking/mutex.c:893 __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 blkdev_get+0x84/0x8a0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 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+0xb68/0x2aa0 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x292/0x3e0 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x401aa0 RSP: 002b:00007ffd5afd7928 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000401aa0 RDX: 0000000000000000 RSI: 00000000000a0141 RDI: 00007ffd5afd7940 RBP: 00000000000ad192 R08: 000000000000000f R09: 00000000000ad192 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000402da0 R13: 0000000000402e30 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by systemd-udevd/6724: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 2 locks held by syz-executor562/7879: #0: (&type->s_umount_key#56/1){+.+.}, at: [] alloc_super fs/super.c:251 [inline] #0: (&type->s_umount_key#56/1){+.+.}, at: [] sget_userns+0x556/0xc30 fs/super.c:516 #1: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1c00 drivers/block/loop.c:1414 3 locks held by syz-executor562/7881: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1c00 drivers/block/loop.c:1414 #1: (&bdev->bd_mutex){+.+.}, at: [] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 #2: (&type->s_umount_key#57){.+.+}, at: [] __get_super.part.0+0x1c6/0x280 fs/super.c:678 1 lock held by syz-executor562/7886: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 1 lock held by syz-executor562/7887: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 1 lock held by syz-executor562/7891: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 1 lock held by syz-executor562/7902: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x192/0x10c0 fs/block_dev.c:1457 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 4.14.184-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+0x5e2/0xb80 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 0xffffffff863e461e