Date: Mon, 14 Aug 2000 17:30:32 -0600 From: "Kenneth D. Merry" <ken@kdm.org> To: current@FreeBSD.ORG Cc: mckusick@mckusick.com Subject: softupdates panic, possibly related to snapshots Message-ID: <20000814173032.A74181@panzer.kdm.org>
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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
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
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.
There is absolutely no warranty for GDB. Type "show warranty" for details.
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.
(kgdb)
==============================================================================
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)
{roadwarrior:/usr/home/ken:4:0}
==============================================================================
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
cd
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.)
Ken
--
Kenneth Merry
ken@kdm.org
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