Anders Le Chevalier writes:
I have encountered an odd bug the last few weeks where authdaemond causes segfaults in libc. I'll post the log at the end of the message.I am using Gentoo with: mail-mta/courier-0.71 net-libs/courier-authlib-0.65.0-r3 sys-libs/glibc-2.18-r1 (I have tried with default 2.17 with same segfault error) sys-devel/gcc-4.8.2 (CFLAGS="-O2 -pipe -fomit-frame-pointer -march=native -mtune=native -msse3") It seems as "now and then" something happens to cause the mailserver and/or authdaemond to restart over and over and cause segfaults as you can see from the logs below. I rebooted the server 2 days ago and I had no more segfaults since 9am on 25th. I have seen these errors before, and they seem to group or come in spurts like this. What can I do to debug this and find the root cause?
Compile courier-authlib with the -g flag, adjust ulimit to enable core dumps, the backtrace from the coredump should be helpful.
Looks like a failed authentication attempt is causing this. Some kind of an error handling problem, it looks like.
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