"ad0: TIMEOUT - WRITE_DMA" type errors with 7.0-RC1

Jeremy Chadwick koitsu at FreeBSD.org
Fri Jan 25 17:00:55 PST 2008

On Fri, Jan 25, 2008 at 04:38:46PM -0800, Jeremy Chadwick wrote:
> I'll have to poke at SMART stats later to see what showed up.

So the box did indeed panic.  The backtrace contained about 1.5 screens
of function calls from the stack, which makes taking a photo of the
screen a bit worthless.  All the functions shown were predominantly I/O
related, and a disk locked up (or something), this didn't surprise me.

SMART stats showed absolutely nothing wrong with ad6, or any of the
other drives on the system.

Worse: my ZFS pool appears *completely* gone -- that's about 170GB of
data.  I don't even know how that happened, because there were
absolutely no issues reported on either of the disks on the ZFS pool.
It's like the situation somehow caused ZFS to go crazy and lose all of
it's metadata.

icarus# zfs list
no datasets available

This doesn't bode well, and doesn't make me happy.  At all.

| Jeremy Chadwick                                    jdc at parodius.com |
| Parodius Networking                           http://www.parodius.com/ |
| UNIX Systems Administrator                      Mountain View, CA, USA |
| Making life hard for others since 1977.                  PGP: 4BD6C0CB |

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