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Date:	Mon, 24 Aug 2015 16:03:40 +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
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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 Cygwi=
n)
> >>
> >> $ 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:

No more metoos required, thank you.  It's a generic problem when trying
to trace forking/spawning parents without also tracing their children.

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 ;)


Corinna

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

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