dmesg
[2425253.737383] postmaster[4792]: segfault at 00002aaab6f0e000 rip
00002aaaab73795b rsp 00007fffff8c9228 error 4
Any suggestions ?
Do you trust that machine's RAM?
Can you try running memtest86 for some extended period of time?
(just to make sure it's not a hardware issue)
Well even that it's not cheap hardware one can never be sure that it's ok.
It's a production server, so I guess it has to be a night job...
Thanks,
Poul
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TIP 2: Don't 'kill -9' the postmaster