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INFO: task hung in grab_super

Status: upstream: reported C repro on 2019/04/19 12:37
Reported-by: syzbot+97f1a9334f246673a1cc@syzkaller.appspotmail.com
First crash: 2043d, last: 727d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (10)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 INFO: task hung in grab_super 4 2214d 2052d 0/1 auto-closed as invalid on 2019/04/28 15:34
android-414 INFO: task hung in grab_super (2) 2 1953d 1975d 0/1 auto-closed as invalid on 2019/11/15 12:55
android-49 INFO: task hung in grab_super 1 2292d 2292d 0/3 auto-closed as invalid on 2019/02/22 13:19
linux-5.15 INFO: task hung in grab_super 1 234d 234d 0/3 auto-obsoleted due to no activity on 2024/07/10 06:22
upstream INFO: task hung in grab_super udf C 209 669d 2318d 0/28 closed as dup on 2018/07/18 11:42
linux-6.1 INFO: task hung in grab_super 1 229d 229d 0/3 auto-obsoleted due to no activity on 2024/07/15 01:06
linux-4.19 INFO: task hung in grab_super vfs udf C error 249 650d 2044d 0/1 upstream: reported C repro on 2019/04/18 03:33
upstream INFO: task hung in grab_super (2) fs 1 533d 533d 0/28 auto-obsoleted due to no activity on 2023/09/05 02:19
upstream INFO: task hung in grab_super (3) nilfs ext4 20 226d 379d 0/28 auto-obsoleted due to no activity on 2024/07/07 20:46
android-49 INFO: task hung in grab_super (2) 1 1919d 1919d 0/3 auto-closed as invalid on 2019/12/19 00:51
▶ ▼ Fix bisection attempts (13)
Created Duration User Patch Repo Result
2022/05/05 20:15 11m bisect fix linux-4.14.y error job log
2022/04/05 19:53 21m bisect fix linux-4.14.y OK (0) job log log
2022/03/06 19:22 22m bisect fix linux-4.14.y OK (0) job log log
2022/02/04 18:53 28m bisect fix linux-4.14.y OK (0) job log log
2022/01/05 17:48 28m bisect fix linux-4.14.y OK (0) job log log
2021/11/15 17:33 22m bisect fix linux-4.14.y OK (0) job log log
2021/10/08 20:53 27m bisect fix linux-4.14.y OK (0) job log log
2021/09/08 20:20 32m bisect fix linux-4.14.y OK (0) job log log
2021/08/09 19:48 32m bisect fix linux-4.14.y OK (0) job log log
2021/07/10 19:22 25m bisect fix linux-4.14.y OK (0) job log log
2021/06/10 18:51 30m bisect fix linux-4.14.y OK (0) job log log
2020/12/13 19:55 37m bisect fix linux-4.14.y OK (0) job log log
2020/10/09 02:37 41m bisect fix linux-4.14.y OK (0) job log log

Sample crash report:
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
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: Scanning with blocksize 4096 failed
INFO: task syz-executor401:8019 blocked for more than 140 seconds.
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512
      Not tainted 4.14.250-syzkaller #0
UDF-fs: warning (device loop11): 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 loop1): udf_load_vrs: No VRS found
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed
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
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
syz-executor401 D29920  8019   7975 0x00000004
UDF-fs: Scanning with blocksize 2048 failed
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: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512
Call Trace:
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
 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: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: Scanning with blocksize 512 failed
print_req_error: 273 callbacks suppressed
print_req_error: I/O error, dev loop11, sector 64
print_req_error: I/O error, dev loop11, sector 512
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256
print_req_error: I/O error, dev loop7, sector 64
print_req_error: I/O error, dev loop7, sector 512
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 2048 failed
print_req_error: I/O error, dev loop11, sector 1024
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
print_req_error: I/O error, dev loop7, sector 1024
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 1024 failed
print_req_error: I/O error, dev loop7, sector 64
UDF-fs: Scanning with blocksize 4096 failed
print_req_error: I/O error, dev loop9, sector 64
print_req_error: I/O error, dev loop9, sector 256
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
 rwsem_down_write_failed+0x343/0x6d0 kernel/locking/rwsem-xadd.c:617
print_req_error: I/O error, dev loop7, sector 1024
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 loop9): 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: error (device loop7): udf_read_tagged: read failed, block=512, location=512
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: warning (device loop7): 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: 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=512, location=512
UDF-fs: Scanning with blocksize 2048 failed
 grab_super+0x55/0x140 fs/super.c:373
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256
 sget_userns+0x2b1/0xc10 fs/super.c:504
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512
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 loop9): udf_load_vrs: No anchor found
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: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: Scanning with blocksize 2048 failed
 sget+0xd1/0x110 fs/super.c:572
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
 mount_bdev+0xcd/0x360 fs/super.c:1107
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512
 mount_fs+0x92/0x2a0 fs/super.c:1237
UDF-fs: Scanning with blocksize 512 failed
 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
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=256, location=256
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
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
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
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
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512
 SYSC_mount fs/namespace.c:3118 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3095
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512
RIP: 0033:0x7ff2c3f38bc9
UDF-fs: warning (device loop9): 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 loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
RSP: 002b:00007ff2c3ea3208 EFLAGS: 00000246
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed
 ORIG_RAX: 00000000000000a5
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512
UDF-fs: Scanning with blocksize 2048 failed
RAX: ffffffffffffffda RBX: 00007ff2c3fbd4c8 RCX: 00007ff2c3f38bc9
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: Scanning with blocksize 1024 failed
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
RDX: 0000000020000180 RSI: 0000000020000080 RDI: 0000000020000100
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
RBP: 00007ff2c3fbd4c0 R08: 0000000000000000 R09: 0000000000000000
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 1024 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
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff2c3fbd4cc
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 2048 failed
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 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
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop1): udf_load_vrs: No VRS 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 512 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
R13: 00007ffd82eb791f R14: 00007ff2c3ea3300 R15: 0000000000022000
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
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
INFO: task syz-executor401:8285 blocked for more than 140 seconds.
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: Scanning with blocksize 2048 failed
      Not tainted 4.14.250-syzkaller #0
UDF-fs: Scanning with blocksize 1024 failed
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
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
UDF-fs: Scanning with blocksize 2048 failed
syz-executor401 D29920  8285   7976 0x00000004
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: warning (device loop7): udf_load_vrs: No anchor found
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3384
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 loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: Scanning with blocksize 4096 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: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512
 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: 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
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=512, location=512
 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105
UDF-fs: warning (device loop1): udf_load_vrs: No VRS 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 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: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
 grab_super+0x55/0x140 fs/super.c:373
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 1024 failed
 sget_userns+0x2b1/0xc10 fs/super.c:504
UDF-fs: warning (device loop7): udf_fill_super: No partition found (1)
UDF-fs: warning (device loop1): udf_load_vrs: No VRS 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=512, location=512
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
 sget+0xd1/0x110 fs/super.c:572
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256
 mount_bdev+0xcd/0x360 fs/super.c:1107
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256
 mount_fs+0x92/0x2a0 fs/super.c:1237
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
UDF-fs: warning (device loop1): udf_load_vrs: No VRS 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=512, location=512
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a10 fs/namespace.c:2902
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: warning (device loop1): udf_load_vrs: No VRS found
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: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
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=512, location=512
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
UDF-fs: warning (device loop11): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 4096 failed
 SYSC_mount fs/namespace.c:3118 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3095
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
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256
RIP: 0033:0x7ff2c3f38bc9
UDF-fs: Scanning with blocksize 2048 failed
RSP: 002b:00007ff2c3ea3208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
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
RAX: ffffffffffffffda RBX: 00007ff2c3fbd4c8 RCX: 00007ff2c3f38bc9
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 loop1): udf_load_vrs: No VRS found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512
RDX: 0000000020000180 RSI: 0000000020000080 RDI: 0000000020000100
UDF-fs: Scanning with blocksize 2048 failed
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
RBP: 00007ff2c3fbd4c0 R08: 0000000000000000 R09: 0000000000000000
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 4096 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff2c3fbd4cc
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: warning (device loop9): udf_fill_super: No partition found (1)
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: Scanning with blocksize 1024 failed
R13: 00007ffd82eb791f R14: 00007ff2c3ea3300 R15: 0000000000022000
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 loop9): udf_read_tagged: read failed, block=256, location=256

Showing all locks held in the system:
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
1 lock held by khungtaskd/1533:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff87016cbc>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
1 lock held by in:imklog/7685:
 #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d52db>] __fdget_pos+0x1fb/0x2b0 fs/file.c:769
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
2 locks held by syz-executor401/8019:
 #0:  (&bdev->bd_fsfreeze_mutex){+.+.}
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512
, at: [<ffffffff81876081>] mount_bdev+0x71/0x360 fs/super.c:1101
 #1:  (&type->s_umount_key#47){+.+.}, at: [<ffffffff81875115>] grab_super+0x55/0x140 fs/super.c:373
2 locks held by syz-executor401/8285:
 #0:  (&bdev->bd_fsfreeze_mutex){+.+.}, at: [<ffffffff81876081>] mount_bdev+0x71/0x360 fs/super.c:1101
 #1:  (&type->s_umount_key#47){+.+.}, at: [<ffffffff81875115>] grab_super+0x55/0x140 fs/super.c:373
2 locks held by syz-executor401/19597:
 #0:  (&bdev->bd_fsfreeze_mutex){+.+.}, at: [<ffffffff81876081>] mount_bdev+0x71/0x360 fs/super.c:1101
 #1:  (&type->s_umount_key#47){+.+.}, at: [<ffffffff81875115>] grab_super+0x55/0x140 fs/super.c:373

=============================================

UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 4096 failed
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 512 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: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 512 failed
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: 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 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: error (device loop7): udf_read_tagged: read failed, block=512, location=512
UDF-fs: warning (device loop9): udf_load_vrs: No anchor found
NMI backtrace for cpu 0
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512
CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.250-syzkaller #0
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:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
 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: 7967 Comm: kworker/1:0 Not tainted 4.14.250-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_long gc_worker
task: ffff8880aa8dc340 task.stack: ffff8880b3180000
RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x50 kernel/kcov.c:68
RSP: 0018:ffff8880b3187c88 EFLAGS: 00000246
RAX: ffff8880aa8dc340 RBX: 0000000000011895 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff87ccef40 RDI: ffffffff87ccef80
RBP: ffffffff87ccef80 R08: ffffffff8b9cacc0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff87ccef40 R14: 0000000000010000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f32d8003400 CR3: 00000000ab6d7000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 check_preemption_disabled+0x30/0x240 lib/smp_processor_id.c:26
 rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:360 [inline]
 rcu_is_watching+0x11/0xb0 kernel/rcu/tree.c:1130
 rcu_read_unlock include/linux/rcupdate.h:681 [inline]
 gc_worker+0x90b/0xb50 net/netfilter/nf_conntrack_core.c:1128
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 df 01 00 48 85 c0 74 1a 65 8b 15 bb a2 ac 7e 81 e2 00 01 1f 00 75 0b 8b 90 58 13 00 00 <83> fa 01 74 01 c3 48 8b 34 24 48 8b 88 60 13 00 00 8b 80 5c 13 
UDF-fs: warning (device loop7): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: Scanning with blocksize 2048 failed
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
UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
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
UDF-fs: Scanning with blocksize 4096 failed
UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: error (device loop11): 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 loop9): udf_load_vrs: No anchor found
UDF-fs: warning (device loop1): udf_load_vrs: No VRS found
UDF-fs: warning (device loop11): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: Scanning with blocksize 4096 failed
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	65 48 8b 04 25 c0 df 	mov    %gs:0x1dfc0,%rax
   f:	01 00
  11:	48 85 c0             	test   %rax,%rax
  14:	74 1a                	je     0x30
  16:	65 8b 15 bb a2 ac 7e 	mov    %gs:0x7eaca2bb(%rip),%edx        # 0x7eaca2d8
  1d:	81 e2 00 01 1f 00    	and    $0x1f0100,%edx
  23:	75 0b                	jne    0x30
  25:	8b 90 58 13 00 00    	mov    0x1358(%rax),%edx
* 2b:	83 fa 01             	cmp    $0x1,%edx <-- trapping instruction
  2e:	74 01                	je     0x31
  30:	c3                   	retq
  31:	48 8b 34 24          	mov    (%rsp),%rsi
  35:	48 8b 88 60 13 00 00 	mov    0x1360(%rax),%rcx
  3c:	8b                   	.byte 0x8b
  3d:	80                   	.byte 0x80
  3e:	5c                   	pop    %rsp
  3f:	13                   	.byte 0x13

Crashes (241):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/10/16 16:50 linux-4.14.y ed99bf0e81b5 0c5d9412 .config console log report syz C ci2-linux-4-14 INFO: task hung in grab_super
2021/04/25 13:39 linux-4.14.y cf256fbcbe34 36c88236 .config console log report syz C ci2-linux-4-14 INFO: task hung in grab_super
2020/12/27 08:27 linux-4.14.y 3f2ecb86cb90 821e0b09 .config console log report syz C ci2-linux-4-14
2020/12/25 02:46 linux-4.14.y 3f2ecb86cb90 c2c1d1dd .config console log report syz C ci2-linux-4-14
2019/10/29 19:53 linux-4.14.y ddef1e8e3f6e 5ea87a66 .config console log report syz C ci2-linux-4-14
2019/08/22 09:54 linux-4.14.y 45f092f9e9cb 4ea67ff8 .config console log report syz C ci2-linux-4-14
2019/06/21 19:41 linux-4.14.y bb263a2a2d43 34bf9440 .config console log report syz C ci2-linux-4-14
2019/04/29 23:23 linux-4.14.y fa5941f45d7e b617407b .config console log report syz C ci2-linux-4-14
2022/11/25 04:04 linux-4.14.y e911713e40ca 74a66371 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 INFO: task hung in grab_super
2022/09/28 03:55 linux-4.14.y 4edbf74132a4 75c78242 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 INFO: task hung in grab_super
2021/12/06 17:48 linux-4.14.y 66722c42ec91 579a8754 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/12/05 09:19 linux-4.14.y 66722c42ec91 a617004c .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/12/04 18:13 linux-4.14.y 66722c42ec91 a617004c .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/05/11 18:44 linux-4.14.y 7d7d1c0ab3eb b3c3bb8e .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/05/10 03:04 linux-4.14.y 7d7d1c0ab3eb bc5434be .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/05/07 22:06 linux-4.14.y 7d7d1c0ab3eb bc5434be .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/05/01 14:45 linux-4.14.y 7d7d1c0ab3eb 77e2b668 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/28 01:34 linux-4.14.y cf256fbcbe34 805b5003 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/24 14:13 linux-4.14.y cf256fbcbe34 17f0b706 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/22 18:36 linux-4.14.y cf256fbcbe34 33c28d03 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/12 22:01 linux-4.14.y 958e517f4e16 6a81331a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/09 23:34 linux-4.14.y 0cc244011f40 6a81331a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/08 17:22 linux-4.14.y 0cc244011f40 6a81331a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/08 13:40 linux-4.14.y 0cc244011f40 6a81331a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/08 12:09 linux-4.14.y 0cc244011f40 6a81331a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/04/06 12:07 linux-4.14.y bd634aa64163 6a81331a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/03/31 07:45 linux-4.14.y bd634aa64163 6a81331a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/03/16 14:23 linux-4.14.y c7150cd2fa8c fdb2bb2c .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/03/14 08:00 linux-4.14.y c7150cd2fa8c 4a003785 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/03/12 13:35 linux-4.14.y c7150cd2fa8c 429d8a6b .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/03/11 04:58 linux-4.14.y 1d177c0872ab c2ca1f2a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/03/10 18:41 linux-4.14.y 1d177c0872ab 764067f3 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/03/02 08:46 linux-4.14.y 3242aa3a635c 92ead296 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/02/18 08:01 linux-4.14.y 2c8a3fceddf0 14052202 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/02/17 18:00 linux-4.14.y 2c8a3fceddf0 052f8d9f .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/02/11 11:13 linux-4.14.y 2c8a3fceddf0 a52ee10a .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/30 18:29 linux-4.14.y 2c8a3fceddf0 fc9fd31e .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/30 12:16 linux-4.14.y 2d2791fce891 fc9fd31e .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/30 02:46 linux-4.14.y 2d2791fce891 fc9fd31e .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/28 00:59 linux-4.14.y 2d2791fce891 a57db36f .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/27 18:40 linux-4.14.y 2d2791fce891 a57db36f .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/27 15:10 linux-4.14.y 2d2791fce891 a0ebf917 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/24 22:40 linux-4.14.y 2d2791fce891 52e37319 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/23 20:02 linux-4.14.y 2d2791fce891 52e37319 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/19 02:29 linux-4.14.y 2762b48e9611 63631df1 .config console log report info ci2-linux-4-14 INFO: task hung in grab_super
2021/01/14 15:23 linux-4.14.y f79dc86058bc 468dbb55 .config console log report info ci2-linux-4-14
2021/01/04 06:55 linux-4.14.y 1752938529c6 79264ae3 .config console log report info ci2-linux-4-14
2021/01/03 19:48 linux-4.14.y 1752938529c6 79264ae3 .config console log report info ci2-linux-4-14
2021/01/02 06:54 linux-4.14.y 1752938529c6 79264ae3 .config console log report info ci2-linux-4-14
2020/12/23 08:31 linux-4.14.y 3f2ecb86cb90 04201c06 .config console log report info ci2-linux-4-14
2020/12/22 13:51 linux-4.14.y 3f2ecb86cb90 04201c06 .config console log report info ci2-linux-4-14
2019/04/19 11:36 linux-4.14.y 58b454ebf81e b0e8efcb .config console log report ci2-linux-4-14
* Struck through repros no longer work on HEAD.