Re: ZFS kernel panic

On Tue, Aug 28, 2007 at 04:27:22PM +0200, Pascal Hofstee wrote:
Hi,

For the last couple of weeks now I've occasionally been getting kernel
panics through ZFS (usually during heavy disk-i/o on the ZFS volume)
usually at the time this happened i was busy in X and therefore unable
to get to the console and force a kernel-dump. Today though it seems i
was lucky and actually managed to catch a kernel panic while in console
mode. Below is the actual panic message, i tried looking at the actual
backtrace but all the interesting frames are purely addresses without
any symbol information. I'll assume this is because of zfs and friends
being loaded as KLDs. Any information on how to provide a proper
backtrace including all symbols involved would be appreciated.

uname -a:
FreeBSD trinity.zion 7.0-CURRENT FreeBSD 7.0-CURRENT #29: Sun Aug 26
20:19:12 CEST 2007 pascal@xxxxxxxxxxxx:/usr/obj/usr/src/sys/TRINITY
i386

panic: ZFS: I/O failure (write on <unknown> off 0: zio 0xc66a9cf0 [L0
ZFS plain file] 20000L/20000P DVA[0]=<0:a126e0000:20000> fletcher2
uncompressed LE contiguous birth=7004722 fill=1
cksum=2dc0c354bd8ccc27:85745b74c1352a7f:72188a8646f7f624:28d89f21264ed4f2): e^

When you don't use redundant configuration (no mirror, no raidz, no
copies>1) then ZFS is going to panic on a write failure. It looks like
ZFS found a bad block on your disk.

--
Pawel Jakub Dawidek http://www.wheel.pl
pjd@xxxxxxxxxxx http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!

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