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From: nyc4bos AT aol DOT com
Subject: Re: New version of w3m 0.5.2 Crashes - GDB help needed
Date: Wed, 05 Jan 2011 16:16:37 -0500
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nyc4bos AT aol DOT com writes:

I've been working with Bob on this but I think we've at
an impass (see below):

> "Robert S. Heckel Jr." <b DOT heckel AT gmail DOT com> writes:
>
>> On Wed, Dec 15, 2010 at 21:07, Robert S. Heckel Jr. <b DOT heckel AT gmail DOT com> wrote:
>>> Will let you know if I find anything.  Anyone else experience 0.5.2-1 crashes?
>>
>> Since I haven't heard of problems from other people (yet at least) and
>> I can't replicate the crash, you may want to try either a reinstall
>> of:
>>
>> w3m libgc1 libintl8 libncurses10 libopenssl098 zlib0
>>
>> or, better, a full reinstall of cygwin.
>
> I tried resinstalling those but it still got the same errors.
>
> I'm hesitant to reinstall a full cygwin...
>>
>> Bob

Bob created a debug version of w3m for me.

Here's what I see:

The crash occurs when doin a `strncmp' in cygwin1.dll:

      4 [main] w3m 3024 exception::handle: Exception: STATUS_ACCESS_VIOLATION
   1564 [main] w3m 3024 open_stackdumpfile: Dumping stack trace to w3m.exe.stack
dump

Program received signal SIGSEGV, Segmentation fault.
0x6110daf5 in strncmp () from /usr/bin/cygwin1.dll
(gdb) bt full
#0  0x6110daf5 in strncmp () from /usr/bin/cygwin1.dll
No symbol table info available.
#1  0x7c85ada0 in OutputDebugStringA ()
   from /cygdrive/c/WINDOWS/system32/kernel32.dll
No symbol table info available.
#2  0x40010006 in ?? ()
No symbol table info available.
#3  0x00000000 in ?? ()
No symbol table info available.
(gdb)


Can you find out what the `strncmp' is trying to do at
that address?

This might also help:

0x6110daf5 <strncmp+117> movzbl (%ebx),%eax
eax 0x22c39c
ebx 0x22c682


Exception: STATUS_ACCESS_VIOLATION at eip=6110DAF5
eax=00526BBA ebx=00000000 ecx=00526BBA edx=0000000B esi=00000002 edi=61179FC7
ebp=0022CBC8 esp=0022CBB8 program=E:\home\tmp\w3m.exe, pid 3024, thread main
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
0022CBC8  6110DAF5  (00000000, 00526BBA, 00000002, 61122847)
0022CBF8  0044FAA8  (00000003, 00526BEB, 0022CC28, 6113A688)
0022CC28  0044FB8B  (6115F040, 610CF730, 0022CC48, 0042ADA4)
0022CC38  00450CC7  (00000000, 00531FDC, 0022CD18, 004033F8)
0022CC48  0042ADA4  (00000001, 00010000, 0022CC88, 6113A70F)
0022CD18  004033F8  (1005942D, 61179FC7, 0022CD88, 61006CD3)
0022CD88  61006CD3  (00000000, 0022CDC4, 61006570, 7FFDE000)
End of stack trace

(gdb) x 0x6110daf5
0x6110daf5 <strncmp+117>:        "\017▒\003\215V▒:\001u,\205▒u\024▒▒\203▒\001\20
3▒\001\017▒\003:\001u\031\203▒\001t▒\204▒u▒\220\215t&"
(gdb)

Thanks.




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