UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 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) UDF-fs: warning (device loop7): udf_load_vrs: No anchor found INFO: task syz-executor243:8586 blocked for more than 140 seconds. UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 Not tainted 4.19.188-syzkaller #0 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor243[12386]: segfault at 0 ip 000000000043c39e sp 00007fef44877188 error 4 in syz-executor243403505[401000+9a000] UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 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 Code: fd d7 c9 0f bc d1 c5 fe 7f 27 c5 fe 7f 6f 20 c5 fe 7f 77 40 c5 fe 7f 7f 60 49 83 c0 1f 49 29 d0 48 8d 7c 17 61 e9 c2 04 00 00 fe 6f 1e c5 fe 6f 56 20 c5 fd 74 cb c5 fd d7 d1 49 83 f8 21 0f UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed syz-executor243 D29680 8586 8113 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed 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 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 grab_super+0xa2/0x350 fs/super.c:383 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 2048 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: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 sget_userns+0x352/0xcd0 fs/super.c:511 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 4096 failed 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 2048 failed 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=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 sget+0x102/0x140 fs/super.c:570 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found 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=512, location=512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found mount_bdev+0xf8/0x3b0 fs/super.c:1131 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) mount_fs+0xa3/0x310 fs/super.c:1261 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 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed 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 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop11): udf_load_vrs: No anchor found syz-executor243[12407]: segfault at 0 ip 000000000043c39e sp 00007fef44877188 error 4 in syz-executor243403505[401000+9a000] entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44aaa9 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 Code: Bad RIP value. RSP: 002b:00007fef44835318 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: 00007ffd9eb59d5f R14: 00007fef44835400 R15: 0000000000022000 Code: fd d7 c9 0f bc d1 c5 fe 7f 27 c5 fe 7f 6f 20 c5 fe 7f 77 40 c5 fe 7f 7f 60 49 83 c0 1f 49 29 d0 48 8d 7c 17 61 e9 c2 04 00 00 fe 6f 1e c5 fe 6f 56 20 c5 fd 74 cb c5 fd d7 d1 49 83 f8 21 0f 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 loop9): udf_read_tagged: read failed, block=256, location=256 Showing all locks held in the system: UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 1 lock held by khungtaskd/1567: UDF-fs: warning (device loop7): udf_load_vrs: No anchor found #0: 000000009ec382e0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/7955: UDF-fs: Scanning with blocksize 2048 failed UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: error (device loop7): 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 loop7): udf_read_tagged: read failed, block=512, location=512 #0: 00000000234cb441 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 2 locks held by syz-executor243/8226: UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop11): udf_fill_super: No partition found (1) 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 1 lock held by syz-executor243/8433: UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 1 lock held by syz-executor243/8572: UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 2 locks held by syz-executor243/8586: UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 #0: 000000004bee0846 (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x90/0x3b0 fs/super.c:1125 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 #1: 000000002a0833da (&type->s_umount_key#47){+.+.}, at: grab_super+0xa2/0x350 fs/super.c:383 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 1 lock held by syz-executor243/12401: UDF-fs: warning (device loop11): udf_load_vrs: No anchor found 1 lock held by syz-executor243/12404: UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 1 lock held by syz-executor243/12412: UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): 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 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 NMI backtrace for cpu 0 UDF-fs: Scanning with blocksize 1024 failed CPU: 0 PID: 1567 Comm: khungtaskd Not tainted 4.19.188-syzkaller #0 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 UDF-fs: Scanning with blocksize 1024 failed Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 NMI backtrace for cpu 1 CPU: 1 PID: 12401 Comm: syz-executor243 Not tainted 4.19.188-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:io_serial_in+0x60/0x80 drivers/tty/serial/8250/8250_port.c:450 Code: 0f b6 8d e1 00 00 00 48 8d 7d 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 13 03 5d 38 89 da ec <5b> 0f b6 c0 5d c3 e8 b5 8e d7 fd eb c9 e8 fe 90 d7 fd eb e6 66 66 RSP: 0018:ffff88809341f368 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff83c08d9c RDI: ffffffff8dc8e1d8 RBP: ffffffff8dc8e1a0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000020 R13: fffffbfff1b91c7c R14: fffffbfff1b91c3d R15: 0000000000000000 FS: 00007fef44835700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a180354d0 CR3: 00000000a972d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_in drivers/tty/serial/8250/8250.h:111 [inline] wait_for_xmitr+0x9a/0x230 drivers/tty/serial/8250/8250_port.c:2042 serial8250_console_putchar+0x1b/0x50 drivers/tty/serial/8250/8250_port.c:3222 uart_console_write+0x59/0x100 drivers/tty/serial/serial_core.c:1888 serial8250_console_write+0x637/0xad0 drivers/tty/serial/8250/8250_port.c:3288 call_console_drivers kernel/printk/printk.c:1764 [inline] console_unlock+0xbb6/0x1110 kernel/printk/printk.c:2460 vprintk_emit+0x2d1/0x740 kernel/printk/printk.c:1965 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 _udf_err+0xdc/0x110 fs/udf/super.c:2323 udf_read_tagged+0x49a/0x530 fs/udf/misc.c:212 udf_check_anchor_block+0x1b4/0x610 fs/udf/super.c:1820 udf_scan_anchors+0x1b3/0x5f0 fs/udf/super.c:1860 udf_find_anchor fs/udf/super.c:1917 [inline] udf_load_vrs+0x633/0xbf0 fs/udf/super.c:1982 udf_fill_super+0x7d2/0x1820 fs/udf/super.c:2177 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44aaa9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fef44835318 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: 00007ffd9eb59d5f R14: 00007fef44835400 R15: 0000000000022000 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) UDF-fs: warning (device loop11): udf_load_vrs: No anchor found