Yes. The same error occurred using 1 thread, as well as 4. If you send me a personal email to jc807177@xxxxxx I will email you a link to a drop box folder where you can access the data. J From: mira_talk-bounce@xxxxxxxxxxxxx [mailto:mira_talk-bounce@xxxxxxxxxxxxx] On Behalf Of Bastien Chevreux Sent: October-31-12 3:45 PM To: mira_talk@xxxxxxxxxxxxx Subject: [mira_talk] Re: Mapping segmentation fault v3.9.5 On Oct 31, 2012, at 19:33 , "Jackie Lighten" <jackie.lighten@xxxxxx> wrote: I get a core dump when Mira attempts to write contigs (see below for manifest file inputs and where the dump takes place) I am running on a virtual machine that has over 20GB RAM and 4 threads allocated. Any idea how to remedy this? This looks like a 3.9.5 log. Does it happen reproducibly, i.e., with -GE:not=1 If yes, could I have the data set, please? (Though I would be able to work on it only next week) B.