Re: cygwin B20.1 xargs grep results in stack fault in kernel32.dll

Re: cygwin B20.1 xargs grep results in stack fault in kernel32.dll

[J. Kleckner]

Alain Magloire wrote:
> 
> Bonjour M. J. Kleckner
> 
> > I often get a stack fault running xargs on Win98.  e.g.
> >   xargs grep -i pattern < files.txt
> > where files.txt contains quoted lines as in:
> >
> > "dir/file1"
> > "dir/file2"
> >
> > Seems to be related to the number of files and size of
> > the list file.  Cutting down the max chars per command
> > line with something like
> >   xargs -s 2000 grep -i pattern < files.txt
> > seems to work.  Is there a smaller default for xargs that
> > would make sense for Win32?
> >
> > Empirically, 9058 was the largest that would work on
> > my machine.
> >
> > Comments?
> 
> None.  I don't think this is related to grep, Have you try
> contacting the cygwin folks or DJGPP.

I have not communicated other than with this posting.
I am now copying that email list with this information.
I have checked the FAQ and email archives.  There does not
appear to be a posting quite like this one and certainly
not one with a workaround of limiting the size of the
buffer to make it work.

I agree with you that the problem is not with grep.
The evidence of the buffer size effect suggests that it
is an xargs/Win interaction problem.  Hopefully, this
detailed info can quickly reveal the failure scenario
for someone with a full build/debug environment.

Jim

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Re: cygwin B20.1 xargs grep results in stack fault in kernel32.dll

[J. Kleckner]

Alain Magloire wrote:
> 
> Bonjour M. J. Kleckner
> 
> > I often get a stack fault running xargs on Win98.  e.g.
> >   xargs grep -i pattern < files.txt
> > where files.txt contains quoted lines as in:
> >
> > "dir/file1"
> > "dir/file2"
> >
> > Seems to be related to the number of files and size of
> > the list file.  Cutting down the max chars per command
> > line with something like
> >   xargs -s 2000 grep -i pattern < files.txt
> > seems to work.  Is there a smaller default for xargs that
> > would make sense for Win32?
> >
> > Empirically, 9058 was the largest that would work on
> > my machine.
> >
> > Comments?
> 
> None.  I don't think this is related to grep, Have you try
> contacting the cygwin folks or DJGPP.

I have not communicated other than with this posting.
I am now copying that email list with this information.
I have checked the FAQ and email archives.  There does not
appear to be a posting quite like this one and certainly
not one with a workaround of limiting the size of the
buffer to make it work.

I agree with you that the problem is not with grep.
The evidence of the buffer size effect suggests that it
is an xargs/Win interaction problem.  Hopefully, this
detailed info can quickly reveal the failure scenario
for someone with a full build/debug environment.

Jim

--
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Send a message to cygwin-unsubscribe@sourceware.cygnus.com