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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: background, pipeline, hang
Date: Fri, 12 Jul 2019 10:14:19 -0400
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On Fri, Jul 12, 2019 at 04:00:57PM +0200, Mike Jonkmans wrote:
> uname output: Linux sint 4.15.0-54-generic #58-Ubuntu SMP Mon Jun 24 10:55:24 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

(Why are you reporting problems on an Ubuntu system on a debian.org
mailing list?)

> Repeat-By:
> 	: | : | : ## immediately finishes
> 	sleep 10 &
> 	: | : | : ## this hangs (^C, ^\, ^Z do not help) until the sleep finishes

I cannot reproduce this.  I tried bash 4.4 on Debian 10 (self-built),
the standard bash 4.4 package (version 4.4-5) on Debian 9, and the standard
bash 5.0 package (version 5.0-4) on Debian 10.

You might want to try running a new instance of bash with --norc --noprofile
to remove any dot file settings from the picture.