I just did a clean build on top of the current master (I was building on top of ghc-7.8) and it worked! Thanks! -- Luís Gabriel On Sun Jan 18 2015 at 9:35:35 AM Sergei Trofimovich wrote:

On Sat, 17 Jan 2015 23:20:30 +0000 Luís Gabriel wrote:

...

Hi there,

I'm doing some experiments with the GHC time profiler and I need to add a new field to the Cost Centre structures. I managed to add the field in the *CCS.h* header as well as in *codeGen/StgCmmProf.hs* but for some reason the program is crashing during garbage collection.

As I have no experience with the GHC internals, I'm having trouble to find the problem. It would be very nice if someone could give me some clue to find this bug.

The patch on GHC as well as the test sample and stack traces can be found here: https://gist.github.com/luisgabriel/39d51cf4d661c7e62e22

I tried your patch as-is on current ghc-HEAD/amd64 and it works fine. (might easily be another problem)

What I am suspicious about is you are using '-prof -debug' and plain 'ghc'.

Could it be that you didn't add GhcRTSWays += debug_p in your build.mk after a patch was tweaked last time and some old runtime against new ghc was used?

I usually use inplace/bin/ghc-stage2 right after compilation without installation.

--

Sergei