Running openSuse Linux: Linux asrock 3.16.6-2-desktop #1 SMP PREEMPT Mon Oct 20 13:47:22 UTC 2014 (feb42ea) x86_64 x86_64 x86_64 GNU/Linux
All updates are current.
Repeatable bug: I start composing - and in the To field enter the name "Jim" (quotes for clarity here only). I then hit a tab for completion - and immediately get a segmentation fault. The person I'm trying to contact is "Jim Schuetz" - who is defined in my gmail account. If I enter "Chuck" and tab - I can get the choice of "Chuck Schuetz" correctly (also Gmail).
Entering "Jim" fails everytime - always with a segmentation fault.
Created attachment 1484 [details]
You should attach the txt file you redirected the output to.
If you did that and this is the result, you need to install claws mail dev package and try again.
Will attempt to upload the zipped results of:
catchsegv claws-mail --debug > debug_claws_mail.txt
Tried yesterday for over an hour to upload this 115K file - and got nothing but timeouts for over an hour.
BTW: PINGS to www.thewildbeast.co.uk have reasonable latency - so it seems specific to your website/Bugzilla. I can get to other websites "over the pond" w/o any timeouts....
Created attachment 1485 [details]
Output of: catchsegv claws-mail --debug > debug_claws_mail.txt
Well, the second - and most important attachment made it today w/o and problems. A little slow - but O.K. :)
it seems it has something to do with templates, can you try following that  for debugging?
Created attachment 1486 [details]
output from gdb, etc.
Output from; gdb claws-mail > gdb_claws-mail.txt 2>&1
Claws-Mail compiled from sources with CFlag=-g
I should have said:
Compiled from sources with CFLAGS=-g
I was not able to reproduce the exact same crash, but a similar problem is now fixed in git. Please re-open if your crash is not fixed in current git.
After a recent upgrading of clib and other libraries from openSUSE, this bug "disappeared". I have tested it for about three weeks - and no failures have re-occurred.
Looks like this bug may have been related to a library issue, outside the domain of Claws itself.
I will upgrade per current "git" in case this bug is merely "latent"...
*** Bug 3404 has been marked as a duplicate of this bug. ***
Per your suggestion, I have been running with git download 3.11.1-79-gde6f18 ever since 3/17/15 and have experienced no seg. faults. Have used "Jim" and many other tab completions without any problems.