On Mon, Apr 03, 2017 at 02:44:48PM +0100, Howard Chu wrote:

You should probably switch to a non-optimized build. The backtrace you posted initially had most parameters optimized out, which also makes things harder to trace.

Ok, I installed binaries built with -O0 on the master server that's been failing; I'll post a new backtrace the next time it crashes, thanks.