Panic during fsck in bhyve VM

[Willem Jan Withagen]

Hi,

Probably due to too many hard-resets of the VM, but I've got the root fs 
of one of my VMs in a real bad state.....
Even where recovery with fsck does not lead to the wanted result.

Recovering might be interesting, but not essential since it is just a 
testing image.

The traceback is below. I've saved the image, en getting it online is 
real easy.

If this helps in getting UFS/fsck bugs fixed, I'll keep it.
Otherwise it is going into /dev/null

--WjW


WARNING: WITNESS option enabled, expect reduced performance.
Trying to mount root from ufs:/dev/vtbd0p2 [rw]...
WARNING: / was not properly dismounted
Enter full pathname of shell or RETURN for /bin/sh:
# fsck /
** /dev/vtbd0p2

USE JOURNAL? [yn] y

** SU+J Recovering /dev/vtbd0p2
** Reading 33554432 byte journal from inode 4.

RECOVER? [yn] y

** Building recovery table.
** Resolving unreferenced inode list.
** Processing journal entries.

***** FILE SYSTEM MARKED CLEAN *****
# df
Filesystem   512-blocks     Used    Avail Capacity  Mounted on
/dev/vtbd0p2   30450552 15277136 12737376    55%    /
devfs                 2        2        0   100%    /dev
# mount -rw /
panic: ufs_dirbad: /: bad dir ino 1364363 at offset 512: mangled entry
cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 
0xfffffe02332b12b0
vpanic() at vpanic+0x189/frame 0xfffffe02332b1330
panic() at panic+0x43/frame 0xfffffe02332b1390
ufs_lookup_ino() at ufs_lookup_ino+0xecd/frame 0xfffffe02332b14b0
VOP_CACHEDLOOKUP_APV() at VOP_CACHEDLOOKUP_APV+0xf1/frame 0xfffffe02332b14e0
vfs_cache_lookup() at vfs_cache_lookup+0xd6/frame 0xfffffe02332b1540
VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xf1/frame 0xfffffe02332b1570
lookup() at lookup+0x5c5/frame 0xfffffe02332b1600
namei() at namei+0x526/frame 0xfffffe02332b16c0
vn_open_cred() at vn_open_cred+0xd5/frame 0xfffffe02332b1820
kern_openat() at kern_openat+0x257/frame 0xfffffe02332b19a0
amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe02332b1ab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe02332b1ab0
--- syscall (499, FreeBSD ELF64, sys_openat), rip = 0x800b09fba, rsp = 
0x7fffffffe868, rbp = 0x7fffffffe940 ---
KDB: enter: panic
[ thread pid 19 tid 100051 ]
Stopped at      kdb_enter+0x3e: movq    $0,kdb_why