Mail Archives: cygwin/2009/07/05/08:37:55
Roman Werpachowski wrote:
> Some more details about my problem
> (http://cygwin.com/ml/cygwin/2009-07/msg00150.html)
>
> $ gcc -v
Actually even more useful would be to know what Cygwin DLL version you're
running. The problems page that CGF directed you to contains in particular
the advice to run "cygcheck -s -v -r > cygcheck.out" and then send the
cygcheck.out file ** as an attachment, not inline, please ** to the list with
your post.
From your earlier post:
> I understand that Cygwin defaults to dumping the stack trace, but why
> the message about segmentation fault? It confuses the hell out of me.
Well, what happened was that there's a bug somewhere, and while cygwin was
in the process of dumping the stack trace for the abort caused by your
assertion firing, the DLL itself had a segfault, and had to give up. It said
"probably corrupted stack", because that's the most common reason why you
might end up following a stray pointer and causing a segfault when you were
trying to unwind the stack, but in this case it's unlikely anything would have
corrupted the stack, so either there's a real bug or perhaps just some kind of
frame-pointer optimisation that confuses the unwind routine.
I tried your example with both gcc-4 and gcc-3 on current 1.7 and it worked
just fine:
> $ cat ass.c
> #include <assert.h>
>
> int main(void)
> {
> assert( 1 == 0 );
> return 0;
> }
>
> $ gcc -g -O0 ass.c -o ass
>
> $ ./ass.exe
> assertion "1 == 0" failed: file "ass.c", line 5, function: main
> Aborted (core dumped)
>
> $ ls
> ass.c ass.exe ass.exe.stackdump
>
> $ cat ass.exe.stackdump
> Stack trace:
> Frame Function Args
> 0022CAF8 7C4F1B1B (00000000, FFFFFFFF, 0022CC28, 00000000)
> 0022CBD8 610B5527 (00000000, 00000000, 00000000, 00000000)
> 0022CC28 610B593B (00000634, 0022CC50, 77F891D2, 000003D0)
> 0022CCE8 610B5A61 (00000634, 00000006, 0022CD18, 610B5B05)
> 0022CCF8 610B5A9C (00000006, 0022CE88, 6115444C, 00000101)
> 0022CD18 610B5B05 (61158054, 00402085, 0040208C, 00000005)
> 0022CD48 6100109B (0040208C, 00000005, 00402080, 00402085)
> 0022CD68 610B2CB8 (6127EE7E, 00000000, 0022CDA8, 61006E4A)
> 0022CDA8 61006E4A (00000000, 0022CDE0, 61006720, 7FFDF000)
> End of stack trace
I also tried at -O2, same results.
cheers,
DaveK
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