On Thu, 12 Sep 2013, Konstantin Belousov wrote:

Might be, your issue is that some filesystems do not care about proper
locking mode for the fifos.  UFS carefully disables shared locking for
VFIFO, but it seems ZFS is not.  I can propose the following band-aid,
which could help you.

This certainly seems to improve things. I have been running builds
for the past couple of hours without any critical problem.

I spotted a few LORs but nothing bad happened so far:

    http://olgeni.olgeni.com/~olgeni/dmesg-2013-09-12

If it keeps working this way I hope there's still some time to fit it into an -RC.

--
jimmy
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