I had a panic today on a -current box from early August 3rd.  This is all I
got out of the crash dump:

# gdb -k /a/ken/perforce/cam/sys/compile/roadwarrior/kernel.debug vmcore.2 
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GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
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This GDB was configured as "i386-unknown-freebsd"...
IdlePTD 3723264
initial pcb at 2fc240
panicstr: handle_workitem_freeblocks: block count
panic messages:
dmesg: kvm_read: invalid address (f0403000)
#0  boot (howto=Cannot access memory at address 0xc9394dec.
) at ../../kern/kern_shutdown.c:303
303                     dumppcb.pcb_cr3 = rcr3();
(kgdb) where
#0  boot (howto=Cannot access memory at address 0xc9394dec.
) at ../../kern/kern_shutdown.c:303
Cannot access memory at address 0xc9394de4.

All local filesystems on the machine, except /, are running softupdates:

{roadwarrior:/usr/home/ken:2:0} df
Filesystem       1K-blocks     Used    Avail Capacity  Mounted on
/dev/da0s2a          63503    52026     6397    89%    /
/dev/da0s2e         198399   153494    29034    84%    /var
/dev/da0s2f        3290562  2961377    65941    98%    /usr
/dev/da1s1a        8648870  7154983   801978    90%    /a
procfs                   4        4        0   100%    /proc
pluto:/usr/local   4065262  1936074  1803968    52%    /usr/local2
{roadwarrior:/usr/home/ken:3:0} mount
/dev/da0s2a on / (ufs, NFS exported, local, writes: sync 8 async 51, reads: sync 497 
async 68)
/dev/da0s2e on /var (ufs, local, soft-updates, writes: sync 146 async 2399, reads: 
sync 94 async 1)
/dev/da0s2f on /usr (ufs, NFS exported, local, soft-updates, writes: sync 2 async 160, 
reads: sync 652 async 93)
/dev/da1s1a on /a (ufs, NFS exported, local, soft-updates, writes: sync 2 async 87, 
reads: sync 546 async 207)
procfs on /proc (procfs, local)
pluto:/usr/local on /usr/local2 (nfs)

The crash happened shortly after I created, mounted and removed a snapshot.
Here's what I did, more or less:

mkdir /var/snapshots
mount -u -o snapshot /var/snapshots/snap1 /var
vnconfig -c /dev/vn0c /var/snapshots/snap1
mount /dev/vn0c /mnt
ls /mnt/...
[ a little more looking around ]
umount /mnt
vnconfig -u /dev/vn0c
cd /var/snapshots
rm snap1
rmdir /var/snapshots

Then I went back to doing other stuff, and a minute or two later, the
machine rebooted.  I didn't think it had time to generate a 128MB crash
dump, but evidently it did.

If anyone wants more information, just let me know, although I'm not sure if
I'm really eager to panic the machine again. :)  (I've got a test box
that would be better for testing, though.)

Kenneth Merry

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