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Date: Mon, 13 Nov 2000 21:28:46 -0500
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: XEmacs on cygwin wierdness
Message-ID: <20001113212846.B23184@redhat.com>
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In-Reply-To: <3A10962B.1D0A386E@ece.gatech.edu>; from cwilson@ece.gatech.edu on Mon, Nov 13, 2000 at 08:32:28PM -0500

On Mon, Nov 13, 2000 at 08:32:28PM -0500, Charles Wilson wrote:
>Christopher Faylor wrote:
>> 
>> On Mon, Nov 13, 2000 at 01:55:00AM -0500, Charles Wilson wrote:
>> >Christopher Faylor wrote:
>> >> >I got a popup saying "Program received signal SIGSEGV, Segmentation fault"
>> >> >Stack window shows "_size_of_stack_reserve__"
>> >>
>[snip]
>> >
>> >That's pretty much it: _size_of_stack_reserve__ is the only thing in the
>> >stack window.  As best I can figure, my xemacs whines before it really
>> >gets started.  The address associated with it is: 0x6106fb17.  stackdump
>> >generated after "c"ontinuing past the SIGSERV:
>> 
>> All of the addresses below are in cygwin.  If you build a debugging
>> version of the DLL it might point to the problem when you run gdb.
>> Maybe it's in cygwin.
>> 
>> cgf
>> 
>
>Okay, here's the results from XEmacs-21.2.36 (tarball, not from CVS)
>built under a latest-CVS-cygwin-debuggable kernel.  I apologize for not
>single-stepping this and investigating more thoroughly, but I've got a
>bunch of papers to grade tonight; I won't be able to return to this
>until tomorrow night at the earliest, but I figured I post my very
>preliminary experience

I really need to see a real stack trace to debug this.  From what you've
sent, it seems to me that this SIGSEGV has occurred in a process that
was invoked as a child of a shell.  That is counter to your original
bug report so something is screwy somewhere.

Are you able to run anything with this DLL at all?  Is the gdb you
are using running the cygwin that you've built?

cgf

>At the time of the crash, the stack contains:
>
>cygwin_crt0
>dll_crt0(per_process *)
>_dll_crt0
>dll_crt0_1(void)
>pinfo_init(char **, int)
>environ_init(char **, int)
>posify(char **, char const *)
>getwinenv(char const *, char const *)
>getenv
>my_findenv(char const *, int *)
>strncmp
>
>SIGSERV occurs at line 119 of strncmp.c ( newlib/libc/string/ ?)
>
>local variables window contains:
>  s1 (char *) 0x12021604    <Address 0x12021604 out of bounds>
>  s2 (char *) 0x61007432   "TEMP="
>  n                        3
>  s1 (char *) 0x12021604    <Address 0x12021604 out of bounds>
>  s2 (char *) 0x61007432   "TEMP="
>  n                        3
>  a1  (a structure)        (long unsigned int *) 0x61007436
>  a2  (a structure)        (long unsigned int *) 0x4
>
>stackdump is:
>
>Exception: STATUS_ACCESS_VIOLATION at eip=6106FBFB
>eax=00000004 ebx=61007436 ecx=00000003 edx=12021604 esi=61007432
>edi=00000004
>ebp=0288F8C8 esp=0288FD64
>program=D:\cygwin\usr\local\bin\xemacs-21.2-b36.exe
>cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
>Stack trace:
>Frame     Function  Args
>0288F8C8  6106FBFB  (00000000, 00000000, 00000000, 00000000)
>0288FD70  6106FBFB  (12021604, 61007432, 00000004, 610078F1)
>0288FDA0  61007908  (61007432, 0288FDCC, 0288FDD0, 61005FEF)
>0288FDD0  6100795A  (61007432, 0A016EC0, 0288FE10, 6100770C)
>0288FE10  61007726  (0A016EC0, 00000000, 0288FE50, 61023F1F)
>0288FE50  6100781C  (0A013070, 0A016EC5, 00000005, 61030CF4)
>0288FEA0  610087B3  (00000000, 00000064, 6100D73D, 610032F0)
>0288FEC0  61030F3B  (00000000, 00000000, 0288FF10, 610032F8)
>0288FF10  61003356  (00000000, 025BA960, 00000246, 8052A98F)
>0288FF40  610038C5  (0043CE48, 025BA960, 81B2EAE0, 80499AD6)
>0288FF60  61003904  (00000000, 00000000, 00780018, 00000002)
>0288FF90  0057B143  (0043CE48, 00000000, 80100000, BEA6CD00)
>0288FFC0  0040103D  (025BA960, 00000045, 7FFDF000, 025C0000)
>0288FFF0  77E992A6  (00401000, 00000000, 000000C8, 00000100)
>End of stack trace
>
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-- 
cgf AT cygnus DOT com                        Red Hat, Inc.
http://sources.redhat.com/            http://www.redhat.com/

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