STM bug on Windows?

[eevar]

I think I've found a bug in the RTS or STM library for Windows (HP 2010.2.0.0 on Vista x64), after running the  ants program from fatvat.co.uk.

After some random period (0-10 seconds), the ant activity suddenly drops by 90% or so. I guess it's a deadlock issue, as ram usage doesn't change much.

Recompiling with -threaded seems to fix the problem. I don't see the same issue on my Linux pc.

I've attached a zip archive containing binaries compiled without threading, with threading, and with profiling support.

There's also output from a 10-sec profiling run (I have no idea what options would make sense..), where said slowdown occurs after about 3 sec.

[eevar]

Binaries would be too large, I'll attach the profiling output I have so far instead.

The source is commit cfeec71ef93f1a632e82700d2c7a33f0f92d35bf from here:  http://github.com/fffej/haskellprojects/tree/master/ants/ , but the problem's been present in all revisions I've tested.

[eevar]

Never mind. I'll track down the issue and reopen this if it's really a runtime issue.