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Assertion when starting up the 4.6 editor on Linux

I am trying to run the UE4.6 editor on Linux, built from the head of the branch (as of a couple hours ago) on Ubuntu 14.04 with clang 3.5 and I get the following assertion (and backtrace) when launching it for the first time:


Anyone else bitten by this? Any fix or workaround available?


Product Version: Not Selected
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asked Nov 19 '14 at 02:52 PM in Linux

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avatar image jcorbier Nov 19 '14 at 03:12 PM

May be similar to this bug...

avatar image jcorbier Nov 19 '14 at 06:23 PM

Running the editor in Valgrind triggers this log when building static meshes at startup (using -ansimalloc).

avatar image RCL STAFF Nov 19 '14 at 06:35 PM

Interesting, we need to double check that code. Anything particular about your setup? Could you paste the log?

avatar image jcorbier Nov 19 '14 at 06:40 PM

Sure. Here is a crash log from a previous run, without any command line option. Please tell me if you need anything else.

crashlog.txt (23.8 kB)
avatar image RCL STAFF Nov 19 '14 at 08:14 PM

Interesting. This issue has been seen previously, but is not easily reproducible on our setups, which are almost exclusively NVidia with binary drivers, while on Linux I believe it has been seen on Mesa drivers only. This is baffling as memory being overwritten is not allocated by the driver, but maybe further locking/copying is somehow involved. Could you try narrowing it down?

avatar image jcorbier Nov 20 '14 at 07:01 AM

Looks a lot like something is smashing the heap. Running the editor in Valgrind and its additional memory guarding does not trigger the crash anymore. It does show a lot of scary stuff though :) I'll try and have a closer look at it.

avatar image jcorbier Jan 04 '15 at 03:37 PM

I haven't had much time to look into this but it appears overriding Forsythe::OptimizeFaces (i.e. fill newIndexList with indexList data instead of runnning the whole algorithm) makes the crash disappear. There may be something wrong in forsythtriangleorderoptimizer.cpp...

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