A few days ago I discovered that running dump(8) on a file system which
has journaled soft updates enabled causes the machine to become
unresponsive. This is using FreeBSD 9.0-R. I can still interact with
the system a little bit (typing echos back) but never get a response to
any action. It seems like there is an I/O issue (deadlock or overload)
and CPU usage spikes as well. Resetting the machine seems to be the
only solution once this occurs (CTRL-C, CTRL-ALT-DEL, logging in again,
etc all fail).
Disclaimer: I have only tested this as a VM under ESXi 5.0 as I don't
have access to any physical servers with 9.0 on them that I can test
with (I will soon though).
As a side note this is the same issue reported here:
http://forums.freebsd.org/showthread.php?t=25787
For now I've turned off journaling (soft updates seem fine) and that
works around the issue.
Let me know if I can provide more details etc!
--
Adam Strohl
A-Team Systems
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