On 09.09.2011 18:02, Tom Lane wrote:
The way that I'd personally proceed to investigate it would probably be to change the "invalid memory alloc request size" size errors (in src/backend/utils/mmgr/mcxt.c; there are about four occurrences) from ERROR to PANIC so that they'll provoke a core dump, and then use gdb to get a stack trace, which would provide at least a little more information about what happened. However, if you are only able to reproduce it in a production server, you might not like that approach. Perhaps you can set up an extra standby that's only there for testing, so you don't mind if it crashes?
If that's not possible or doesn't reproduce the issue, there's also functions in glibc to produce a backtrace without aborting the program: https://www.gnu.org/s/libc/manual/html_node/Backtraces.html.
I think you could also fork() + abort() to generate a core dump, not just a backtrace.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
