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Date: Thu, 6 Jun 2013 13:02:10 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: resuming backgrounded job causes hang (Cygwin 1.7.19 / Dothan 1.7GHz)
Message-ID: <20130606110210.GA13320@calimero.vinschen.de>
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On Jun  6 11:04, Seb.Th wrote:
> Le 06/06/2013 08:25, Sumudu Fernando a écrit :
> 
> >I'm having a weird issue in 1.7.19.  As per the subject line, when I
> >try to resume a backgrounded job, I get a hang (after bash echoes the
> >job name).  I couldn't find anything about this in the list archives,
> >possibly because it may be limited to specific architectures (more
> >below).
> >
> >simple testcase from a fresh terminal (I'm using the default mintty, with bash)
> >$ ls | less
> ><CTRL-Z to background less>
> >$ fg
> >
> >whereupon bash echoes the job name (in my case "ls -hF --color=tty |
> >less -r") and then nothing happens (no response to input AFAICT)
> >
> >Interesting things:
> >- this only happens on my (ancient) laptop (this is why I mentioned
> >the processor in the subject line) -- it *does not* happen on my
> >desktop machine (which is a Q6600, nearly ancient now I suppose).
> >- Windows task manager shows the process I tried to resume at high CPU
> >usage, and if I kill it from there ("end process") bash recovers fine
> >- I can open a separate cygwin terminal and see the "ls" in the output
> >of ps.  It does *not* have an "S" beside it to indicate a suspended
> >process.  "kill" does nothing, "kill -9" hangs (until I kill via task
> >manager).
> >
> >I attached cygcheck output; I did get some errors (that are in the
> >file also) but I don't know what they actually mean (if anything).
> >
> >FWIW, this did not happen with 1.7.17 (I skipped 1.7.18).
> 
> This problem seems to be very similar to the thread "Bash sub-shell
> freezing in Midnight Commander".
> 
> Something went wrong after 1.7.17 (or its dependencies ?)

This is signal stuff which is usually cgf's domain and he's not
available for another couple of days.

I can reproduce this, however, and I'm trying to find a fix.  Stay
tuned.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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