UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop11): udf_fill_super: No partition found (1) UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 INFO: task syz-executor576:8261 blocked for more than 140 seconds. UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 Not tainted 4.14.231-syzkaller #0 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found syz-executor576 D29920 8261 7979 0x00000004 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 Call Trace: UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 4096 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 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 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 grab_super+0x55/0x140 fs/super.c:373 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found syz-executor576[19255]: segfault at 0 ip 000000000043c39e sp 00007f79c4193188 error 4 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 in syz-executor576837961[401000+9a000] UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 sget_userns+0x2b1/0xc10 fs/super.c:504 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found sget+0xd1/0x110 fs/super.c:572 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 mount_bdev+0xcd/0x360 fs/super.c:1107 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 mount_fs+0x92/0x2a0 fs/super.c:1237 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop11): udf_fill_super: No partition found (1) vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 fs/namespace.c:2879 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 syz-executor576[19268]: segfault at 0 ip 000000000043c39e sp 00007f79c4193188 error 4 in syz-executor576837961[401000+9a000] UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb UDF-fs: warning (device loop11): udf_load_vrs: No anchor found syz-executor576[19277]: segfault at 0 ip 000000000043c39e sp 00007f79c4193188 error 4 in syz-executor576837961[401000+9a000] RIP: 0033:0x44aaa9 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 1024 failed RSP: 002b:00007f79c4151318 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 RAX: ffffffffffffffda RBX: 00000000004cb4e8 RCX: 000000000044aaa9 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found RDX: 0000000020000040 RSI: 0000000020000280 RDI: 00000000200004c0 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed RBP: 00000000004cb4e0 R08: 0000000000000000 R09: 0000000000000000 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 syz-executor576[19282]: segfault at 0 ip 000000000043c39e sp 00007f79c4193188 error 4 in syz-executor576837961[401000+9a000] UDF-fs: Scanning with blocksize 2048 failed R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 R13: 00007ffefe0cdebf R14: 00007f79c4151400 R15: 0000000000022000 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 Showing all locks held in the system: UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: warning (device loop11): udf_load_vrs: No anchor found 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 UDF-fs: Scanning with blocksize 2048 failed 2 locks held by syz-executor576/8261: UDF-fs: Scanning with blocksize 4096 failed #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 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 ============================================= UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: warning (device loop11): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 print_req_error: 261 callbacks suppressed print_req_error: I/O error, dev loop7, sector 4096 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 NMI backtrace for cpu 0 print_req_error: I/O error, dev loop11, sector 512 CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.231-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 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 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 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found kthread+0x30d/0x420 kernel/kthread.c:232 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found 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: 19264 Comm: syz-executor576 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888093620440 task.stack: ffff8880a3898000 RIP: 0010:isdigit include/linux/ctype.h:28 [inline] RIP: 0010:skip_atoi+0x8f/0xd0 lib/vsprintf.c:129 RSP: 0018:ffff8880a389f538 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff878a98e3 RCX: 0000000000000035 RDX: 0000000000000003 RSI: ffff8880a389f658 RDI: ffffffff878a98e2 RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff17cf514 R10: ffffffff8be7a8a0 R11: ffff888093620440 R12: dffffc0000000000 R13: ffff8880a389f598 R14: 0000000000000005 R15: ffffffff878a98e2 FS: 00007f79c4151700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f16af498028 CR3: 00000000aaa65000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: format_decode+0x68b/0x890 lib/vsprintf.c:1951 vsnprintf+0x128/0x1340 lib/vsprintf.c:2133 sprintf+0xa7/0xd0 lib/vsprintf.c:2383 print_time kernel/printk/printk.c:1230 [inline] print_prefix+0x244/0x3a0 kernel/printk/printk.c:1253 msg_print_text+0xae/0x1a0 kernel/printk/printk.c:1280 console_unlock+0x29b/0xf20 kernel/printk/printk.c:2377 vprintk_emit+0x224/0x620 kernel/printk/printk.c:1923 vprintk_func+0x58/0x160 kernel/printk/printk_safe.c:409 printk+0x9e/0xbc kernel/printk/printk.c:1996 _udf_warn+0xc9/0xe5 fs/udf/super.c:2330 udf_load_vrs.cold+0x67/0x6c fs/udf/super.c:1981 udf_fill_super+0x715/0x1680 fs/udf/super.c:2170 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:2549 [inline] do_mount+0xe53/0x2a00 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: 0033:0x44aaa9 RSP: 002b:00007f79c4151318 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004cb4e8 RCX: 000000000044aaa9 RDX: 0000000020000040 RSI: 0000000020000280 RDI: 00000000200004c0 RBP: 00000000004cb4e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007ffefe0cdebf R14: 00007f79c4151400 R15: 0000000000022000 Code: 38 d0 7f 04 84 c0 75 3f 0f be 43 ff 48 89 da 83 e2 07 44 8d 74 05 d0 48 89 d8 48 c1 e8 03 42 0f b6 04 20 38 d0 7f 04 84 c0 75 23 <0f> be 03 83 e8 30 83 f8 09 76 a2 e8 e1 14 57 fa 44 89 f0 5b 5d UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 512 failed print_req_error: I/O error, dev loop9, sector 64