ghc compiled program crashes with segfault when using -M and/or -c

[mte]

When running my program with limited heap size (-H128m) and/or using the compacting procedure (-c) in garbage collection, the program crashes with the following message:

Segmentation fault/access violation in generated code

It seems that the segfault occurs the first time the garbage collector runs as the log file generated with -S contains the headline only.

The program runs fine without the -M and -c options.

This problem is critical from my point of view as I cannot control what kind of data the customer will supply to the algorithm and I would the prefer the algorithm (then deployed as a DLL) to gracefully report a heap overflow instead of eating all the customer's terminal server's memory.

Let me know how I can help to fix this bug.

As the source code is proprietary, I cannot attach it here.

[simonmar]

This certainly sounds like a bug in the compacting GC. Without means to reproduce it though, it's impossible to diagnose.

If you could reproduce the error in non-proprietary code, or somehow arrange to give me the code with a no-redistribution license, that would help a lot.

If you need to use -M without the compacting GC, the workaround is to add -c100, which should disable the automatic compacting GC threshold.

[mte]

Simon, I need a valid email address of yours. I tried to send the source code to simonmar at research.microsoft.com but the delivery failed.

[simonmar]

You want simonmar@….

[guest]

Simon - I also have seen this behavior. If you are still looking for code, email me at orielmaxime@… and I can provide. I've added myself to the cc.

This bug is sad for me because I often run programs that solve puzzles, and need to run with a lot of memory.

[simonmar]

I'm validating a fix for this

[simonmar]

To merge:

Tue Feb  5 02:14:25 PST 2008  Simon Marlow <simonmar@microsoft.com>
  * FIX #2047: Windows (and older Unixes): align info tables to 4 bytes, not 2

[igloo]

Merged