UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 2048 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 loop9): udf_fill_super: No partition found (1) INFO: task syz-executor753:8194 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 UDF-fs: error (device loop7): 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: Scanning with blocksize 4096 failed syz-executor753 D28456 8194 8152 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) UDF-fs: error (device loop9): 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 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 UDF-fs: Scanning with blocksize 512 failed call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 __get_super.part.0+0x209/0x2e0 fs/super.c:698 __get_super include/linux/spinlock.h:329 [inline] get_super+0x2b/0x50 fs/super.c:727 fsync_bdev+0x14/0xc0 fs/block_dev.c:483 invalidate_partition+0x74/0xb0 block/genhd.c:1592 drop_partitions.isra.0+0x9c/0x190 block/partition-generic.c:454 UDF-fs: error (device loop9): 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 loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 rescan_partitions+0xab/0x970 block/partition-generic.c:527 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found __blkdev_reread_part+0x189/0x220 block/ioctl.c:173 blkdev_reread_part+0x23/0x40 block/ioctl.c:193 loop_reread_partitions drivers/block/loop.c:645 [inline] loop_set_status+0x103e/0x1800 drivers/block/loop.c:1330 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 loop_set_status64+0xb2/0x110 drivers/block/loop.c:1450 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=512, location=512 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: Scanning with blocksize 2048 failed lo_ioctl+0x41f/0x20e0 drivers/block/loop.c:1593 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 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x5cb/0x1a80 block/ioctl.c:601 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 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: Scanning with blocksize 4096 failed UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) 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: Scanning with blocksize 2048 failed UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 block_ioctl+0xe9/0x130 fs/block_dev.c:1906 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 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 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 loop9): 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 512 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 loop9): 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 loop9): udf_load_vrs: No anchor found UDF-fs: warning (device loop7): udf_load_vrs: No anchor found ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 UDF-fs: Scanning with blocksize 1024 failed __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 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 loop7): 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 loop7): udf_read_tagged: read failed, block=512, location=512 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: warning (device loop7): udf_load_vrs: No anchor found entry_SYSCALL_64_after_hwframe+0x49/0xbe UDF-fs: Scanning with blocksize 2048 failed RIP: 0033:0x440577 Code: Bad RIP value. UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 RSP: 002b:00007fff6a690c58 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 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=512, location=512 RAX: ffffffffffffffda RBX: 00007fff6a690c80 RCX: 0000000000440577 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 RDX: 00007fff6a690d90 RSI: 0000000000004c04 RDI: 0000000000000004 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop7): udf_load_vrs: No anchor found RBP: 0000000000000004 R08: 00007fff6a690af0 R09: 00007ffffbad8001 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 R13: 0000000000a162c0 R14: 00007fff6a690d90 R15: 0000000000000001 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 INFO: task syz-executor753:8417 blocked for more than 140 seconds. UDF-fs: warning (device loop7): udf_load_vrs: No anchor found Not tainted 4.19.204-syzkaller #0 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor753 D28368 8417 8156 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 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:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 __get_super.part.0+0x209/0x2e0 fs/super.c:698 __get_super include/linux/spinlock.h:329 [inline] get_super+0x2b/0x50 fs/super.c:727 fsync_bdev+0x14/0xc0 fs/block_dev.c:483 invalidate_partition+0x74/0xb0 block/genhd.c:1592 drop_partitions.isra.0+0x9c/0x190 block/partition-generic.c:454 rescan_partitions+0xab/0x970 block/partition-generic.c:527 __blkdev_reread_part+0x189/0x220 block/ioctl.c:173 blkdev_reread_part+0x23/0x40 block/ioctl.c:193 loop_reread_partitions drivers/block/loop.c:645 [inline] loop_set_status+0x103e/0x1800 drivers/block/loop.c:1330 loop_set_status64+0xb2/0x110 drivers/block/loop.c:1450 lo_ioctl+0x41f/0x20e0 drivers/block/loop.c:1593 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x5cb/0x1a80 block/ioctl.c:601 block_ioctl+0xe9/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440577 Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 3f 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff6a690c58 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fff6a690c80 RCX: 0000000000440577 RDX: 00007fff6a690d90 RSI: 0000000000004c04 RDI: 0000000000000004 RBP: 0000000000000004 R08: 00007fff6a690af0 R09: 00007ffffbad8001 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000a162c0 R14: 00007fff6a690d90 R15: 0000000000000009 INFO: task systemd-udevd:8420 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28000 8420 4699 0x00000100 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x604/0x1200 kernel/locking/mutex.c:1083 blkdev_put+0x30/0x520 fs/block_dev.c:1839 blkdev_close+0x86/0xb0 fs/block_dev.c:1888 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f43688f1270 Code: Bad RIP value. RSP: 002b:00007ffc6e2ba1e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000000000000000f RCX: 00007f43688f1270 RDX: 00007f43688dbb58 RSI: 0000000000000000 RDI: 000000000000000f RBP: 00007f43697ab710 R08: 000055899d3065f0 R09: 0000000000000010 R10: 0000000000000116 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 000055899d306860 R15: 000000000000000f Showing all locks held in the system: 1 lock held by khungtaskd/1571: #0: 000000000de5f664 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 3 locks held by kworker/1:2/3687: 1 lock held by in:imklog/7810: #0: 00000000ec9caaa5 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by syz-executor753/8162: 2 locks held by syz-executor753/8194: #0: 00000000ffba27bb (&bdev->bd_mutex){+.+.}, at: blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 #1: 000000006bf2def3 (&type->s_umount_key#47){.+.+}, at: __get_super.part.0+0x209/0x2e0 fs/super.c:698 1 lock held by syz-executor753/8401: 2 locks held by syz-executor753/8417: #0: 00000000bbf52d72 (&bdev->bd_mutex){+.+.}, at: blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 #1: 00000000e5b77ab5 (&type->s_umount_key#47){.+.+}, at: __get_super.part.0+0x209/0x2e0 fs/super.c:698 1 lock held by systemd-udevd/8420: #0: 00000000bbf52d72 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1839 2 locks held by systemd-udevd/8455: #0: 00000000f2e49a0f (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 #1: 0000000081e124b9 (loop_ctl_mutex){+.+.}, at: lo_open+0x19/0xd0 drivers/block/loop.c:1771 2 locks held by syz-executor753/11751: #0: 00000000e4ab858a (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 #1: 0000000081e124b9 (loop_ctl_mutex){+.+.}, at: lo_release+0x1a/0x1f0 drivers/block/loop.c:1790 1 lock held by syz-executor753/11756: #0: 0000000081e124b9 (loop_ctl_mutex){+.+.}, at: loop_set_status+0x94/0x1800 drivers/block/loop.c:1223 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8401 Comm: syz-executor753 Not tainted 4.19.204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:97 Code: ff 48 89 df e8 b1 d4 35 00 e9 ab fe ff ff 4c 89 ef e8 a4 d4 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <48> 8b 34 24 65 48 8b 04 25 80 df 01 00 65 8b 15 6c 4c 9f 7e 81 e2 RSP: 0018:ffff88809719f6a0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000006 RCX: ffffffff83771fdf RDX: 0000000000000000 RSI: ffffffff83771f81 RDI: 0000000000000007 RBP: 0000000000000006 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000383 R15: 0000000000000000 FS: 0000000000a16300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000496ecc CR3: 000000009c969000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lookup_bh_lru fs/buffer.c:1261 [inline] __find_get_block+0xbe/0xde0 fs/buffer.c:1291 __getblk_slow+0x14a/0x9e0 fs/buffer.c:1040 __getblk_gfp fs/buffer.c:1321 [inline] __bread_gfp+0x218/0x300 fs/buffer.c:1366 sb_bread include/linux/buffer_head.h:309 [inline] udf_tread+0xe8/0x130 fs/udf/misc.c:44 udf_read_tagged+0x4e/0x530 fs/udf/misc.c:210 udf_check_anchor_block+0x1b4/0x610 fs/udf/super.c:1820 udf_scan_anchors+0x3ba/0x5f0 fs/udf/super.c:1882 udf_find_anchor fs/udf/super.c:1925 [inline] udf_load_vrs+0x872/0xbf0 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:2483 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2813 ksys_mount+0xcf/0x130 fs/namespace.c:3029 __do_sys_mount fs/namespace.c:3043 [inline] __se_sys_mount fs/namespace.c:3040 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3040 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4406e9 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff6a690eb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004406e9 RDX: 0000000020000040 RSI: 0000000020000140 RDI: 0000000020000080 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff6a690ee0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6a690edc R13: 00007fff6a690f10 R14: 00007fff6a690ef0 R15: 0000000000000008 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 89 df mov %rbx,%rdi 3: e8 b1 d4 35 00 callq 0x35d4b9 8: e9 ab fe ff ff jmpq 0xfffffeb8 d: 4c 89 ef mov %r13,%rdi 10: e8 a4 d4 35 00 callq 0x35d4b9 15: e9 23 fe ff ff jmpq 0xfffffe3d 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop * 29: 48 8b 34 24 mov (%rsp),%rsi <-- trapping instruction 2d: 65 48 8b 04 25 80 df mov %gs:0x1df80,%rax 34: 01 00 36: 65 8b 15 6c 4c 9f 7e mov %gs:0x7e9f4c6c(%rip),%edx # 0x7e9f4ca9 3d: 81 .byte 0x81 3e: e2 .byte 0xe2