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Date: Wed, 31 May 2006 09:42:13 -0400 (EDT)
From: Igor Peshansky <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: cygwin AT cygwin DOT com
Subject: FIXED: Re: cygwin1-20060527: replicated stdout (Was Re: cygwin1-20060519:  proc_waiter: unknown value * on proc pipe)
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On Sun, 28 May 2006, Igor Peshansky wrote:

> On Fri, 19 May 2006, Igor Peshansky wrote:
>
> > On Fri, 19 May 2006, Christopher Faylor wrote:
> >
> > > On Fri, May 19, 2006 at 10:01:27PM -0400, Igor Peshansky wrote:
> > > >Hi,
> > > >
> > > >Found a weird problem with the latest CVS (a regression from end
> > > >February, but I can track it down further, too, if the testcase
> > > >doesn't help).  Compiling the following program:
> > > >
> > > >#include <stdio.h>
> > > >int main() { printf("1\n"); exit(-1); }
> > > >
> > > >with "gcc -mno-cygwin" and running it produces the following output:
> > > >
> > > >1
> > > >979250836 [proc_waiter] bash 5028 proc_waiter: unknown value 49 on proc pipe
> > > >979250894 [proc_waiter] bash 5028 proc_waiter: unknown value 13 on proc pipe
> > > >979250920 [proc_waiter] bash 5028 proc_waiter: unknown value 10 on proc pipe
> > > >979264978 [proc_waiter] bash 5028 proc_waiter: unknown value 49 on proc pipe
> > > >979265034 [proc_waiter] bash 5028 proc_waiter: unknown value 13 on proc pipe
> > > >979267613 [proc_waiter] bash 5028 proc_waiter: unknown value 10 on proc pipe
> > > >979278806 [proc_waiter] bash 5028 proc_waiter: unknown value 49 on proc pipe
> > > >979278860 [proc_waiter] bash 5028 proc_waiter: unknown value 13 on proc pipe
> > > >979278886 [proc_waiter] bash 5028 proc_waiter: unknown value 10 on proc pipe
> > > >979289509 [proc_waiter] bash 5028 proc_waiter: unknown value 49 on proc pipe
> > > >979289568 [proc_waiter] bash 5028 proc_waiter: unknown value 13 on proc pipe
> > > >979289595 [proc_waiter] bash 5028 proc_waiter: unknown value 10 on proc pipe
> > > >979300049 [proc_waiter] bash 5028 proc_waiter: unknown value 49 on proc pipe
> > > >979300106 [proc_waiter] bash 5028 proc_waiter: unknown value 13 on proc pipe
> > > >979300411 [proc_waiter] bash 5028 proc_waiter: unknown value 10 on proc pipe
> > > >
> > > >but (!) only in an xterm.  Try as I might, I couldn't reproduce this
> > > >in rxvt or bash with CYGWIN=tty.  I don't know what the differences
> > > >are, but there it is.  I did reproduce this in an xterm running tcsh
> > > >and pdksh (and a perl shell, interestingly enough).  The above
> > > >testcase was distilled from a huge Java program that exhibited this
> > > >behavior.
> > > >
> > > >Note that 49 is really the character '1', and 13 and 10 are CRLF.
> > > >I've also gotten other characters at times, all corresponding to
> > > >valid messages from the program, printed to either stdout or stderr.
> > > >The number of times it repeats also seems to vary -- in some cases
> > > >it's only once, in others more (it's repeated 5 times above).
> > >
> > > I can't duplicate this but, I'm not really interested in this kind of
> > > problem unless you can duplicate the problem with a cygwin snapshot.
> > > Otherwise, there is no way of knowing how you've built the DLL or what
> > > other local mods might be in it.
> >
> > Sorry, should've mentioned that I can also duplicate this with both the
> > 20060518 and 20060516 snapshots.
>
> Ok, with the 20060521 (and later) snapshots things became different.
> This error is now more readily reproducible (on anything that uses ptys --
> xterm, rxvt, bash+CYGWIN=tty), but the output has changed.  Running the
> above program now results in the output repeated 5 times:
>
> $ uname -svr
> CYGWIN_NT-5.1 1.5.20s(0.155/4/2) 20060527 19:21:22
> $ echo $CYGWIN
> tty
> $ ./B
> 1
> 1
> 1
> 1
> 1
> 1
> $
>
> I've verified that the whole output is repeated, not just the first
> character or the first line.
>
> Hopefully this will help someone track this down.
> 	Igor

This has been fixed in 20060528.  Thank you, CGF!
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_	    pechtcha AT cs DOT nyu DOT edu | igor AT watson DOT ibm DOT com
ZZZzz /,`.-'`'    -.  ;-;;,_		Igor Peshansky, Ph.D. (name changed!)
     |,4-  ) )-,_. ,\ (  `'-'		old name: Igor Pechtchanski
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

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