On Fri, 2 Nov 2007, Michael wrote:
Hello, i know that you are working on freebsd scheduler, probably this
bug have relation to your work:
After upgrading to Freebsd 7 (from RELENG_6), postgresql coredumps several
times per day. I asked mail list pgsql-bugs and got answer that this
is probably due to changes in scheduler (i tried both SCHED_ULE and
SCHED_4BSD):
http://www.nabble.com/PostgreSQL-crash-on-Freebsd-7-t4693969.html
I hope you don't mind me forwarding this to stable. Does this problem
occur with the 4BSD scheduler? Is your system swapping?
What seems like a reasonable bet at this point is that the FBSD7
kernel's scheduler has been changed in a way that makes it possible for
it to sometimes not schedule a process for a very long time (order of a
couple minutes). If that happened while the process was holding a
spinlock then other processes waiting to get the spinlock would fail
like this
Can you dig into this problem?
If this is incorrect email to ask for help, then sorry for
disturbing.
Michael
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