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Date: Wed, 21 Sep 2005 11:44:12 -0400
From: Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: fairly repeatable fork(?) errors in (contrived) test script
Message-ID: <20050921154412.GA21260@trixie.casa.cgf.cx>
Reply-To: cygwin AT cygwin DOT com
References: <200509211413 DOT j8LEDAZV011552 AT tigris DOT pounder DOT sol DOT net>
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On Wed, Sep 21, 2005 at 09:13:09AM -0500, Tom Rodman wrote:
>All:
>
>I'm using the 9/19 snapshot. The sleep in the below test script seems to
>be required, otherwise the script could be simplified and still
>cause errors.
>
>The test script works (always?) without errors on 1.3.20.

1.3.20?  That is at least three years old.  There is nothing useful that
can be derived from quoting a regression from a version which is that
old.

I can't reproduce this, even with 81 repetitions instead of 9.  Please
see the snapshot reporting guidelines that I requested at
http://sources.redhat.com/ml/cygwin/2005-09/msg00419.html .

cgf


>Here are a couple of test runs:
>
>  ~ $ /tmp/test
>  x: 1
>  x: 2
>  x: 3
>  x: 4
>  x: 5
>  x: 6
>  x: 7
>  x: 8
>  x: 9
>      896 [main] bash 6544 fork_parent: child 6680 died waiting for longjmp before initialization
>  /tmp/test: fork: No such file or directory
>
>  all done
>  ~ $ /tmp/test
>  x: 1
>  x: 2
>  x: 3
>  x: 4
>  x: 5
>  x: 6
>  x: 7
>  x: 8
>  x: 9
>  /tmp/test: fork: No such file or directory
>      812 [main] bash 7028 fork_parent: child 3576 died waiting for longjmp before initialization
>  /tmp/test: fork: Bad file descriptor
>
>  all done
>
>--
>With a real (ie useful) script (that also involved a sleep) I was able to
>get similar(?) errors after running only 5 instances of that
>script in parallel.
>
>
>"do nothing" test script:
>--v-v------------------C-U-T---H-E-R-E-------------------------v-v-- 
>#!/bin/bash
>
>bar()
>{
>
>  foo=$(
>    echo $(
>      perl -pe '1;' /etc/passwd|
>      tee /dev/null|
>      (sleep 7;tr '[A-Z]' '[a-z]') |
>      tail -1
>    )
>  )
>
>  echo foo: $foo >/dev/null
>
>}
>
>
>for x in 1 2 3 4 5 6 7 8 9
>do
>  echo x: $x
>  bar &
>done
>
>wait
>echo
>echo all done
>
>
>
>
>
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