How to debug a segfault.
haskell2 at davidb.org
Wed Feb 28 11:10:04 EST 2007
Simon Marlow wrote:
> David Brown wrote:
>> 0x080b45b8 in s2EI_info ()
> Fortunately I wrote a wiki page on just this subject, mainly so that
> I can say RTFM :-) After reading the FM, if you're still having
> difficulties then post a followup and we'll try to help if we can.
This looks quite helpful, but still like it is going to be a pain in
the neck. I did figure a few things out last night.
- I grepped all of the libraries going into the program, and found
the s2EI_info defined in libHSbase.o
- Thanks to the splitting, I un"ar"ed libHSbase.o into individual
files, and found this label in a file that appears to be the code
to 'Foreign.C.peekCAString'. This makes sense with the assembly
- It appears to be trying to dereference a NULL pointer.
I'm going to try the back-in-time approach given to see if I can track
down what is calling this.
I discovered it isn't just x86, but appears to be this particular
machine. My other machines work fine. There might be a library
difference between the machines, or something like that.
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