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Date: Fri, 08 Dec 2006 20:30:19 -0700
From: Eric Blake <ebb9 AT byu DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: xargs gives grep/gawk too much
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According to Eric Blake on 12/8/2006 1:53 PM:
> It looks like you are picking up the cygwin version of grep/gawk, so I'm not 
> sure why you are getting a failure.

As it is, I think there might be a regression in cygwin's handling of
arbitrary length argument handling between cygwin processes:

$ /bin/echo `perl -e 'print "a "x15000'` >/dev/null
Segmentation fault (core dumped)
$ cat echo.exe.stackdump
Exception: STATUS_ACCESS_VIOLATION at eip=610DE121
eax=00000000 ebx=0000225B ecx=FFFFFFFF edx=00000000 esi=0022D008 edi=00000000
ebp=0022CC28 esp=0022CC24 program=c:\cygwin\bin\echo.exe, pid 1600, thread
main
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
0022CC28  610DE121  (00000000, 611010E8, 0022CC50, 00000000)
0022CC78  610E5BD3  (0022D008, 00000000, 611010E8, 610EE94A)
0022CC98  610E5C61  (00000000, 611010E8, 0040539B, 004054AA)
0022CCE8  61092AA8  (0000225B, 61171BA8, 00660090, 00000000)
0022CD98  61006148  (00000000, 0022CDD0, 610054C0, 0022CDD0)
610054C0  61004416  (0000009C, A02404C7, E8611001, FFFFFF48)
      4 [main] echo 1600 _cygtls::handle_exceptions: Error while dumping
state (probably corrupted stack)

In other words, I am starting to feel more inclined that there is a cygwin
bug, rather than an xargs bug.  :(

If it helps any:

$ /bin/echo `perl -e 'print "a "x2986'`>/dev/null && echo $?
Segmentation fault (core dumped)
$ /bin/echo `perl -e 'print "a "x2985'`>/dev/null && echo $?
0

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
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