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Re: 1.5.6-pre: Occasional bad memory accesses within cygwin1.dll
On Mon, 29 Dec 2003, Christopher Faylor wrote:
> On Sun, Dec 28, 2003 at 03:52:33PM -0000, Max Bowsher wrote:
> >I installed a self-built cygwin HEAD version - mostly it works fine, but it
> >causes odd failures during builds (speculation: race when many processes
> >being created and destroyed?)
> >The most common failure is a Windows error box:
> >The instruction at "0x6108621a" references memory at "0x610030b0". The
> >memory could not be written.
> >(These addresses are constant.)
> >$ addr2line -e /bin/cygwin1.dll 0x6108621a 0x610030b0
> This isn't too useful, unfortunately. The line numbers are an artifact
> of the fact that there is no STABS information in the generated asm in
> 'sigfe.s'. Can you get an assembly listing of the lines around this
I think this is the same problem. It shows up all over the place for me
in the testsuite.
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This GDB was configured as "i686-pc-cygwin"...
Program received signal SIGSEGV, Segmentation fault.
0x6108bcad in _sigfe ()
Current language: auto; currently c++
#0 0x6108bcad in _sigfe ()
#1 0xffffffff in ?? ()
#2 0x00402b1f in cygwin_crt0 (f=0x401134 <main>)
#3 0x0040103c in mainCRTStartup ()
#4 0x77f1bb7b in _system_dlls__ ()
Dump of assembler code for function _sigfe:
0x6108bc90 <_sigfe>: push %edx
0x6108bc91 <_sigfe+1>: mov %fs:0x4,%eax
0x6108bc97 <_sigfe+7>: mov $0x4,%edx
0x6108bc9c <_sigfe+12>: xadd %edx,0xffffeff8(%eax)
0x6108bca3 <_sigfe+19>: lea 0x6108bcb1,%eax
0x6108bca9 <_sigfe+25>: xchg %eax,0x8(%esp,1)
0x6108bcad <_sigfe+29>: mov %eax,(%edx)
0x6108bcaf <_sigfe+31>: pop %edx
0x6108bcb0 <_sigfe+32>: ret
End of assembler dump.
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
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