UDF-fs: warning (device loop3): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop3): udf_fill_super: No partition found (1) UDF-fs: error (device loop3): udf_read_tagged: read failed, block=256, location=256 INFO: task syz-executor079:21853 blocked for more than 140 seconds. Not tainted 4.14.252-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor079 D28336 21853 7980 0x00000004 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1e6/0x350 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+0x44/0x80 kernel/locking/rwsem.c:26 __get_super.part.0+0x271/0x390 fs/super.c:678 __get_super include/linux/spinlock.h:317 [inline] get_super+0x2b/0x50 fs/super.c:707 fsync_bdev+0x14/0xc0 fs/block_dev.c:495 invalidate_partition+0x74/0xb0 block/genhd.c:1509 drop_partitions.isra.0+0x83/0x150 block/partition-generic.c:442 rescan_partitions+0xa9/0x800 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 drivers/block/loop.c:624 [inline] loop_set_status+0xeeb/0x12b0 drivers/block/loop.c:1193 loop_set_status64+0x92/0xe0 drivers/block/loop.c:1311 lo_ioctl+0x587/0x1cd0 drivers/block/loop.c:1441 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 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: 0033:0x7f499e73dfe7 RSP: 002b:00007ffd71c2b208 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffd71c2b230 RCX: 00007f499e73dfe7 RDX: 00007ffd71c2b340 RSI: 0000000000004c04 RDI: 0000000000000004 RBP: 0000000000000004 R08: 00007ffd71c2b0a0 R09: 00000000fbad8001 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000555556a4b2c0 R14: 00007ffd71c2b340 R15: 00007ffd71c2b480 INFO: task syz-executor079:21863 blocked for more than 140 seconds. Not tainted 4.14.252-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor079 D28912 21863 7979 0x00000004 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 mount_bdev+0x71/0x360 fs/super.c:1101 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+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f499e73e139 RSP: 002b:00007ffd71c2b468 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f499e73e139 RDX: 0000000020000180 RSI: 0000000020000080 RDI: 0000000020000100 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000b75eb R13: 00007ffd71c2b490 R14: 00007ffd71c2b47c R15: 00007ffd71c2b480 INFO: task syz-executor079:21864 blocked for more than 140 seconds. Not tainted 4.14.252-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor079 D28912 21864 7977 0x00000004 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 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x343/0x6d0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 grab_super+0x55/0x140 fs/super.c:373 sget_userns+0x2b1/0xc10 fs/super.c:504 sget+0xd1/0x110 fs/super.c:572 mount_bdev+0xcd/0x360 fs/super.c:1107 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+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f499e73e139 RSP: 002b:00007ffd71c2b468 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f499e73e139 RDX: 0000000020000180 RSI: 0000000020000080 RDI: 0000000020000100 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000b7645 R13: 00007ffd71c2b490 R14: 00007ffd71c2b47c R15: 00007ffd71c2b480 INFO: task syz-executor079:21865 blocked for more than 140 seconds. Not tainted 4.14.252-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor079 D28912 21865 7978 0x00000004 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 mount_bdev+0x71/0x360 fs/super.c:1101 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+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f499e73e139 RSP: 002b:00007ffd71c2b468 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f499e73e139 RDX: 0000000020000180 RSI: 0000000020000080 RDI: 0000000020000100 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000b769a R13: 00007ffd71c2b490 R14: 00007ffd71c2b47c R15: 00007ffd71c2b480 INFO: task syz-executor079:21879 blocked for more than 140 seconds. Not tainted 4.14.252-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor079 D28912 21879 7982 0x00000004 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 mount_bdev+0x71/0x360 fs/super.c:1101 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+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f499e73e139 RSP: 002b:00007ffd71c2b468 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f499e73e139 RDX: 0000000020000180 RSI: 0000000020000080 RDI: 0000000020000100 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000b775f R13: 00007ffd71c2b490 R14: 00007ffd71c2b47c R15: 00007ffd71c2b480 Showing all locks held in the system: 1 lock held by khungtaskd/1532: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 3 locks held by syz-executor079/21853: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 drivers/block/loop.c:1414 #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-executor079/21863: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x71/0x360 fs/super.c:1101 2 locks held by syz-executor079/21864: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x71/0x360 fs/super.c:1101 #1: (&type->s_umount_key#47){++++}, at: [] grab_super+0x55/0x140 fs/super.c:373 1 lock held by syz-executor079/21865: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x71/0x360 fs/super.c:1101 1 lock held by syz-executor079/21879: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x71/0x360 fs/super.c:1101 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.252-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+0x1b2/0x281 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 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 21854 Comm: syz-executor079 Not tainted 4.14.252-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809dd366c0 task.stack: ffff8880abf58000 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline] RIP: 0010:check_preemption_disabled+0x5d/0x240 lib/smp_processor_id.c:19 RSP: 0018:ffff8880abf5f708 EFLAGS: 00000802 RAX: 1ffffffff11e1270 RBX: 000000000000000a RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff87938280 RDI: ffffffff87ccefc0 RBP: ffffffff87ccefc0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff88809dd366c0 R12: 0000000000000001 R13: ffffffff87938280 R14: 0000000000000200 R15: 0000000000000000 FS: 0000555556a4b300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f01051a5000 CR3: 00000000a21af000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lookup_bh_lru fs/buffer.c:1324 [inline] __find_get_block+0xd5/0xc40 fs/buffer.c:1353 __getblk_slow+0x127/0x7a0 fs/buffer.c:1100 __getblk_gfp fs/buffer.c:1383 [inline] __bread_gfp+0x206/0x2e0 fs/buffer.c:1428 sb_bread include/linux/buffer_head.h:309 [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+0x3b9/0x530 fs/udf/super.c:1902 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+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f499e73e139 RSP: 002b:00007ffd71c2b468 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f499e73e139 RDX: 0000000020000180 RSI: 0000000020000080 RDI: 0000000020000100 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000b7622 R13: 00007ffd71c2b490 R14: 00007ffd71c2b47c R15: 00007ffd71c2b480 Code: 8b 3b fe 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 a8 8b 3b fe 48 c7 c0 80 93 f0 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <80> 3c 10 00 0f 85 0e 01 00 00 48 83 3d 81 e2 d6 05 00 0f 84 f9 ---------------- Code disassembly (best guess): 0: 8b 3b mov (%rbx),%edi 2: fe 44 89 e0 incb -0x20(%rcx,%rcx,4) 6: 5b pop %rbx 7: 5d pop %rbp 8: 41 5c pop %r12 a: 41 5d pop %r13 c: 41 5e pop %r14 e: 41 5f pop %r15 10: c3 retq 11: e8 a8 8b 3b fe callq 0xfe3b8bbe 16: 48 c7 c0 80 93 f0 88 mov $0xffffffff88f09380,%rax 1d: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 24: fc ff df 27: 48 c1 e8 03 shr $0x3,%rax * 2b: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2f: 0f 85 0e 01 00 00 jne 0x143 35: 48 83 3d 81 e2 d6 05 cmpq $0x0,0x5d6e281(%rip) # 0x5d6e2be 3c: 00 3d: 0f .byte 0xf 3e: 84 f9 test %bh,%cl