[Bug 253158] Panic: snapacct_ufs2: bad block - Non-suJ mksnap_ffs(8) crash

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253158

--- Comment #43 from Cy Schubert <cy at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #39)

Both patches, each by themselves, don't panic. The sys/ufs/ffs/ffs_snapshot.c
patch resolves the problem without causing any other problems.

However the sys/kern/vfs_vnops.c patch by itself causes other problems which
results in the following errors during boot:

mountroot: waiting for device /dev/ada0s1a...
input in flex scanner failed
read: read error: Unknown error: 66047
warning: total configured swap (524276 pages) exceeds maximum recommended
amount
 (457736 pages).
[...]
Starting dhclient.
input in flex scanner failed
/etc/rc.d/dhclient: WARNING: failed to start dhclient
vtnet2: link state changed to UP
pid 417 (sleep), jid 0, uid 0: exited on signal 3
Quit

The system hung during boot because the network interface never obtained an IP
address through dhclient.

beastie# newfs /dev/ada3
/dev/ada3: 16384.0MB (33554432 sectors) block size 32768, fragment size 4096
        using 27 cylinder groups of 625.22MB, 20007 blks, 80128 inodes.
super-block backups (for fsck_ffs -b #) at:
 192, 1280640, 2561088, 3841536, 5121984, 6402432, 7682880, 8963328, 10243776,
 11524224, 12804672, 14085120, 15365568, 16646016, 17926464, 19206912,
 20487360, 21767808, 23048256, 24328704, 25609152, 26889600, 28170048,
 29450496, 30730944, 32011392, 33291840
beastie# mount /dev/ada3 /mnt
beastie# mksnap_ffs /mnt/.snap/test
beastie# fstyp /mnt/.snap/test: filesystem not recognized.
beastie#

It's getting late here. I cannot continue testing sys/kern/vfs_vnops.c by
itself tonight. I can continue tomorrow.

Repeat: sys/ufs/ffs/ffs_snapshot.c does fix the problem without any negative
effects.

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