Strange taskqueue timeouts

Michael Neumann mneumann at
Wed Nov 26 04:27:26 PST 2008

Jeremy Chadwick schrieb:
On Wed, Nov 26, 2008 at 12:52:59PM +0100, Michael Neumann wrote:
I just rsynced my harddisk to a DragonFly box. After that, the box became more and more unusable (at first I could still
ping and ssh into it, then after a few seconds this also didn't worked anymore). It's a pretty "old" DragonFly I am using,
so probably I should compile a more recent kernel and the problem goes away. But maybe it's something worse, so I'll better
report it...
These are a known problem with the FreeBSD ATA layer.  No one's been
able to figure out what the true cause is, but sometimes they can
indicate disk errors if the LBA shown is consistent (in your case, it
looks like it may be).
Too strange that after a reboot or reset, the disk was completely missing.
There was no ad4 (or ar0) any more. It appeared again, after powering down
the box completely.
Prior to my recent departure from the FreeBSD Project, I documented this
common problem.  And no, there is no fix for it; it requires a large
amount of time and money (replacing hardware) to troubleshoot.
Thanks! I'll take a close look if this kind of problems appear again.



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