Hello Jan Schaumann.
Thanks for your bug report.
On Wed, Oct 12, 2016 at 08:44:51PM -0400, Jan Schaumann wrote:
> Package: util-linux
> Version: 2.20.1-1ubuntu3.1
> more(1) may attempt to call tsetattr(3) on stderr even if its process is
> not in a process group with a controlling terminal. As a result,
> SIGTTOU will be generated, suspending the process.
> The following example illustrates the issue:
> $ /bin/sh -c "timeout 60 /bin/sh -c \"ls | more\""
If I'm not mistaken this testcase makes me think that the problem
is still there in util-linux 2.28.2-1.
Could you please contact upstream directly about this issue?