Thomas Ronner wrote:
Hi Andriy,
Andriy Gapon wrote:
on 08/07/2009 23:30 Thomas Ronner said the following:
Hello,
I don't know whether this is the right list; maybe freebsd-fs is more
appropriate. So please redirect me there if this isn't the right place.
My system (i386, Athlon XP) locks hard when scrubbing a certain pool. It
has been doing this for at least a couple of months now. For this reason
I upgraded to 7.2-STABLE recently as this had the latest ZFS bits, but
this doesn't help. It even makes the problem worse: in previous versions
I just hit the reset button and forgot about it, but now it "remembers"
that it was scrubbing (I presume) and tries to resume at the exact same
place, locking up again. This means I haven't been able to mount these
ZFS volumes successfully: the moment I do a /etc/rc.d/zfs start from
single user mode (I have my /, /var and /usr on UFS) it locks up in a
couple of seconds. And by locks up I really mean locks up. No panic,
nothing. Pressing the reset button on the chassis is the only way to
reboot.
You can try adding SW_WATCHDOG option to your kernel which might help
catching the
lockup. Things like INVARIANTS and WITNESS might help th debugging too.
Serial console for remote debugging would be very useful too.
I'll definitely try those and report back on this list. Thanks for your
answer!
I put the following in my kernel config:
# debugging
options KDB
options DDB
options GDB
options BREAK_TO_DEBUGGER
options INVARIANTS
options INVARIANT_SUPPORT
options WITNESS
options WITNESS_KDB
options DEBUG_VFS_LOCKS
options DIAGNOSTIC
options SW_WATCHDOG
When I send a BREAK from my serial console it enters the debugger, so
that works. But when I start ZFS (/etc/rc.d/zfs start) it freezes again
and BREAK doesn't enter the debugger. I'll try playing with the watchdog
now, but I doubt this will help. Any clues?
Thanks,
Thomas
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