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Re: Hang with 20051018 (3rd version) snapshot while building OOo
- From: Christopher Faylor <cgf-no-personal-reply-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Wed, 19 Oct 2005 16:50:11 -0400
- Subject: Re: Hang with 20051018 (3rd version) snapshot while building OOo
- References: <4356A25A.email@example.com>
- Reply-to: cygwin at cygwin dot com
On Wed, Oct 19, 2005 at 03:45:30PM -0400, Volker Quetschke wrote:
>Testing my favorite testcase takes a while, especially if I'm still
>not able to reproduce on one of my systems. This is for the third
>version of yesterdays snapshot (20051018) .
>Basically we still see the same problem as in
>The build hangs in a tcsh like this:
> PID PPID PGID WINPID TTY UID STIME COMMAND
> 220 1 220 220 con 11290 08:29:27 /usr/bin/bash
> 752 220 752 268 con 11290 08:29:32 /usr/bin/tcsh
> 1236 752 1236 2040 con 11290 08:29:52 /usr/bin/perl
> 2228 1236 1236 3740 con 11290 12:05:48 /cygdrive/e/work/OOo/SRC680/solenv/wntmsci10/bin/dmake
> 3676 2228 1236 2828 con 11290 12:05:48 /usr/bin/tcsh
> 3980 3676 1236 3980 con 11290 12:05:48 /usr/bin/tcsh
> 1696 1 1696 1696 con 11290 12:30:42 /usr/bin/bash
>I 2396 1 2396 2396 con 11290 12:30:45 /usr/bin/bash
> 3560 1696 3560 2668 con 11290 12:30:54 /usr/bin/tcsh
> 3748 3560 3748 2292 con 11290 12:31:30 /usr/bin/ps
>And by attaching strace to the hung pid and using "ls /proc/*/fd"
>the attached (behind the cygcheck.log) strace was created.
Given the number of changes that have been made to cygwin, particularly
in /proc handling, it's very difficult for me to believe that you are
not seeing *any* differences in behavior and I'm wondering if you're
actually seeing what you think you're seeing, i.e., I'm wondering if the
process is just timing out and you are attributing it coming "unstuck"
to the fact that you're doing "ls /proc/*/fd". I can't see any reason
why inspecting /proc should cause any kind of special behavior in the
latest snapshots since /proc handling now occurs in its own thread.
I could almost convince myself that there was a race in /proc handling
before but I could never convince myself that doing something like "ls /proc/*/fd"
would have any effect on it. Nevertheless, I did make some changes to
eliminate the potential source of hangs in this code. So, I can't
understand why you wouldn't see something different.
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