UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 4096 failed INFO: task systemd-udevd:8040 blocked for more than 140 seconds. UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: warning (device loop6): udf_load_vrs: No anchor found Not tainted 4.14.295-syzkaller #0 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop8): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 2048 failed "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. UDF-fs: warning (device loop6): udf_fill_super: No partition found (1) UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 systemd-udevd D28712 8040 4632 0x00000304 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop0): udf_load_vrs: No anchor found Call Trace: UDF-fs: Scanning with blocksize 4096 failed context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 UDF-fs: warning (device loop0): udf_fill_super: No partition found (1) UDF-fs: warning (device loop10): udf_fill_super: No partition found (1) Dev loop3: unable to read RDB block 15 loop3: unable to read partition table schedule+0x8d/0x1b0 kernel/sched/core.c:3431 Dev loop4: unable to read RDB block 15 loop3: partition table beyond EOD, truncated Dev loop0: unable to read RDB block 15 loop4: unable to read partition table loop_reread_partitions: partition scan of loop3 () failed (rc=-5) schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 loop0: unable to read partition table loop4: partition table beyond EOD, truncated __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 loop0: partition table beyond EOD, truncated Dev loop5: unable to read RDB block 15 loop_reread_partitions: partition scan of loop4 () failed (rc=-5) loop5: unable to read partition table loop_reread_partitions: partition scan of loop0 () failed (rc=-5) loop5: partition table beyond EOD, truncated UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 loop_reread_partitions: partition scan of loop5 () failed (rc=-5) __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 512 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 blkdev_get+0x88/0x890 fs/block_dev.c:1611 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772 UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 do_dentry_open+0x44b/0xec0 fs/open.c:777 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 vfs_open+0x105/0x220 fs/open.c:888 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3571 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 2048 failed UDF-fs: Scanning with blocksize 2048 failed UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop0): udf_load_vrs: No anchor found do_filp_open+0x179/0x3c0 fs/namei.c:3605 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: warning (device loop0): udf_fill_super: No partition found (1) UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop8): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 4096 failed UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop10): udf_fill_super: No partition found (1) do_sys_open+0x296/0x410 fs/open.c:1081 UDF-fs: warning (device loop6): udf_fill_super: No partition found (1) Dev loop0: unable to read RDB block 15 buffer_io_error: 47 callbacks suppressed Buffer I/O error on dev loop4, logical block 0, async page read loop0: unable to read partition table Buffer I/O error on dev loop4, logical block 0, async page read Buffer I/O error on dev loop4, logical block 0, async page read loop0: partition table beyond EOD, Buffer I/O error on dev loop4, logical block 0, async page read truncated do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb loop_reread_partitions: partition scan of loop0 () failed (rc=-5) RIP: 0033:0x7f44b4096840 Dev loop5: unable to read RDB block 15 RSP: 002b:00007ffc0826bfe8 EFLAGS: 00000246 loop5: unable to read partition table Dev loop3: unable to read RDB block 15 loop5: partition table beyond EOD, truncated ORIG_RAX: 0000000000000002 Dev loop4: unable to read RDB block 15 RAX: ffffffffffffffda RBX: 0000560e96b8f140 RCX: 00007f44b4096840 loop4: unable to read partition table loop4: partition table beyond EOD, loop3: unable to read partition table loop_reread_partitions: partition scan of loop5 () failed (rc=-5) loop3: partition table beyond EOD, RDX: 0000560e95d3bfe3 RSI: 00000000000a0800 RDI: 0000560e96b8bf20 truncated loop_reread_partitions: partition scan of loop3 () failed (rc=-5) UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 RBP: 00007ffc0826c160 R08: 0000560e95d3b670 R09: 0000000000000010 truncated R10: 0000560e95d3bd0c R11: 0000000000000246 R12: 00007ffc0826c0b0 R13: 0000560e96b89970 R14: 0000000000000003 R15: 000000000000000e loop_reread_partitions: partition scan of loop4 () failed (rc=-5) UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 INFO: task syz-executor210:8045 blocked for more than 140 seconds. Not tainted 4.14.295-syzkaller #0 UDF-fs: warning (device loop0): udf_load_vrs: No anchor found "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 512 failed syz-executor210 D28104 8045 7994 0x00000004 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: warning (device loop8): udf_load_vrs: No anchor found schedule+0x8d/0x1b0 kernel/sched/core.c:3431 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 1024 failed __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 __get_super.part.0+0x271/0x390 fs/super.c:678 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 __get_super include/linux/spinlock.h:317 [inline] get_super+0x2b/0x50 fs/super.c:707 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: warning (device loop10): udf_load_vrs: No anchor found fsync_bdev+0x14/0xc0 fs/block_dev.c:495 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 invalidate_partition+0x74/0xb0 block/genhd.c:1509 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed drop_partitions.isra.0+0x83/0x150 block/partition-generic.c:442 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 rescan_partitions+0xa9/0x800 block/partition-generic.c:515 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: warning (device loop6): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 4096 failed __blkdev_reread_part+0x140/0x1d0 block/ioctl.c:173 UDF-fs: Scanning with blocksize 4096 failed blkdev_reread_part+0x23/0x40 block/ioctl.c:193 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop10): udf_fill_super: No partition found (1) loop_reread_partitions drivers/block/loop.c:624 [inline] loop_set_status+0xeeb/0x12b0 drivers/block/loop.c:1193 UDF-fs: warning (device loop8): udf_fill_super: No partition found (1) loop_set_status64+0x92/0xe0 drivers/block/loop.c:1316 UDF-fs: warning (device loop0): udf_fill_super: No partition found (1) Dev loop3: unable to read RDB block 15 loop3: unable to read partition table lo_ioctl+0x587/0x1cd0 drivers/block/loop.c:1446 loop3: partition table beyond EOD, truncated Dev loop0: unable to read RDB block 15 loop0: unable to read partition table loop0: partition table beyond EOD, truncated Dev loop4: unable to read RDB block 15 Dev loop5: unable to read RDB block 15 loop_reread_partitions: partition scan of loop3 () failed (rc=-5) loop5: unable to read partition table __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 loop4: unable to read partition table loop_reread_partitions: partition scan of loop0 () failed (rc=-5) loop4: partition table beyond EOD, loop5: partition table beyond EOD, truncated truncated block_ioctl+0xd9/0x120 fs/block_dev.c:1893 loop_reread_partitions: partition scan of loop4 () failed (rc=-5) loop_reread_partitions: partition scan of loop5 () failed (rc=-5) UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 512 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: warning (device loop0): udf_load_vrs: No anchor found SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 RIP: 0033:0x7ff5cd354717 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 RSP: 002b:00007ffda1479338 EFLAGS: 00000202 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found ORIG_RAX: 0000000000000010 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop10): udf_load_vrs: No anchor found RAX: ffffffffffffffda RBX: 00007ffda1479360 RCX: 00007ff5cd354717 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: warning (device loop0): udf_load_vrs: No anchor found RDX: 00007ffda1479470 RSI: 0000000000004c04 RDI: 0000000000000004 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop6): udf_read_tagged: read failed, block=256, location=256 RBP: 0000000000000004 R08: 00007ffda14791d0 R09: 00007ffdfbad8001 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 UDF-fs: warning (device loop8): udf_load_vrs: No anchor found UDF-fs: warning (device loop10): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop6): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=512, location=512 R13: 00005555557952c0 R14: 00007ffda1479470 R15: 0000000000000001 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop8): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop6): udf_load_vrs: No anchor found UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: error (device loop10): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: Scanning with blocksize 4096 failed Showing all locks held in the system: UDF-fs: error (device loop8): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop10): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop6): udf_fill_super: No partition found (1) UDF-fs: warning (device loop0): udf_fill_super: No partition found (1) UDF-fs: warning (device loop8): udf_load_vrs: No anchor found 1 lock held by khungtaskd/1517: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 UDF-fs: Scanning with blocksize 4096 failed 1 lock held by in:imklog/7700: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 UDF-fs: warning (device loop8): udf_fill_super: No partition found (1) 1 lock held by systemd-udevd/8040: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 3 locks held by syz-executor210/8045: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 drivers/block/loop.c:1419 #1: (&bdev->bd_mutex){+.+.}, at: [] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 #2: (&type->s_umount_key#47){.+.+}, at: [] __get_super.part.0+0x271/0x390 fs/super.c:678 1 lock held by syz-executor210/14932: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 drivers/block/loop.c:1419 1 lock held by syz-executor210/14937: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 drivers/block/loop.c:1419 ============================================= NMI backtrace for cpu 1 UDF-fs: warning (device loop10): udf_load_vrs: No anchor found CPU: 1 PID: 1517 Comm: khungtaskd Not tainted 4.14.295-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 UDF-fs: Scanning with blocksize 4096 failed 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 UDF-fs: warning (device loop10): udf_fill_super: No partition found (1) 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: 8066 Comm: syz-executor210 Not tainted 4.14.295-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 task: ffff8880abe8a400 task.stack: ffff888093388000 RIP: 0010:__lock_acquire+0x3c5/0x3f20 kernel/locking/lockdep.c:3435 RSP: 0018:ffff88809338f4c0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000584 RDX: 1ffff110157d1599 RSI: 1ffff110157d1595 RDI: ffff8880abe8acc0 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8880abe8acb0 R11: ffff8880abe8a400 R12: ffff8880abe8acc8 R13: 0000000000000011 R14: 0000000000000011 R15: ffffffff8becddc0 FS: 0000555555795300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff5cd384730 CR3: 00000000b5143000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] find_get_entry+0x45/0x630 mm/filemap.c:1352 pagecache_get_page+0x53/0xab0 mm/filemap.c:1465 find_or_create_page include/linux/pagemap.h:326 [inline] grow_dev_page fs/buffer.c:1004 [inline] grow_buffers fs/buffer.c:1077 [inline] __getblk_slow+0x1dd/0x7a0 fs/buffer.c:1104 __getblk_gfp fs/buffer.c:1383 [inline] __bread_gfp+0x206/0x2e0 fs/buffer.c:1428 sb_bread include/linux/buffer_head.h:343 [inline] udf_tread+0xe1/0x130 fs/udf/misc.c:44 udf_read_tagged+0x40/0x4c0 fs/udf/misc.c:219 udf_check_anchor_block+0x18a/0x590 fs/udf/super.c:1823 udf_scan_anchors+0x321/0x530 fs/udf/super.c:1885 udf_find_anchor fs/udf/super.c:1920 [inline] udf_load_vrs+0x5a1/0xa90 fs/udf/super.c:1985 udf_fill_super+0x715/0x1660 fs/udf/super.c:2177 mount_bdev+0x2b3/0x360 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2572 [inline] do_mount+0xe65/0x2a30 fs/namespace.c:2905 SYSC_mount fs/namespace.c:3121 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3098 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ff5cd354889 RSP: 002b:00007ffda1479598 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007ff5cd354889 RDX: 0000000020000040 RSI: 0000000020000280 RDI: 0000000020000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffda14795c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffda14795bc R13: 00007ffda14795f0 R14: 00007ffda14795d0 R15: 0000000000000002 Code: 00 fc ff df 80 3c 02 00 0f 85 4a 27 00 00 48 b8 00 00 00 00 00 fc ff df 4d 89 62 10 4d 8d 62 18 4c 89 e2 48 c1 ea 03 80 3c 02 00 <0f> 85 59 27 00 00 48 8b 84 24 b8 01 00 00 49 8d bb 54 08 00 00