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X-HELO: calimero.vinschen.de
Date: Mon, 24 Aug 2015 18:50:19 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: strace -f hangs forever with process who creates child process
Message-ID: <20150824165019.GA16196@calimero.vinschen.de>
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On Aug 24 16:03, Corinna Vinschen wrote:
> On Aug 24 09:37, Roger Wells wrote:
> > On 08/24/2015 09:05 AM, Nellis, Kenneth wrote:
> > > From: Qian Hong
> > >> I just found `strace -f` hangs forever for me.
> > >>
> > >> $ uname -a
> > >> CYGWIN_NT-6.1 fracting-PC 2.2.1(0.289/5/3) 2015-08-15 11:00 i686 Cyg=
win)
> > >>
> > >> $ cat parent.sh
> > >> ./child.sh
> > >>
> > >> $ cat child.sh
> > >> echo haha
> > >>
> > >> $ strace -f -o out.txt bash -c parent.sh #hangs forever.
> > >=20
> > > FWIW, this also seems to hang for me, but can't confirm that it=20
> > > hangs "forever", as I didn't wait that long. Ctrl/C-ing out works,=20
> > > but that takes several seconds to take effect. And then I can't=20
> > > delete out.txt:
> > >=20
> > > $ rm -f out.txt
> >=20
> > I also can confirm this on the same cygwin release but for x86_64:
>=20
> No more metoos required, thank you.  It's a generic problem when trying
> to trace forking/spawning parents without also tracing their children.
>=20
> Having said that, I don't know what the cause is, but I guess that
> "nobody did it" for a while.  Also, "don't do that" for now ;)

Please try the latest developer snapshot from https://cygwin.com/snapshots/
It should fix the issue.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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