grep with --extended-regexp much slower on Ubuntu 16.04

[C de-Avillez]

On Fri, 9 Feb 2018 19:35:52 +0100
Ralf Mardorf <silver.bullet at zoho.com> wrote:

> On Fri, 9 Feb 2018 09:42:44 +0000, Brian Bird wrote:
> >Since I can reproduce this consistently I would like to know if
> >anyone else can/can't reproduce it on Ubuntu 16.04LTS?  
> 
> Hi,
> 
> I can confirm that this at least happens when booting Ubuntu 16.04.3
> LTS from my Arch Linux install, in a systemd-nspawn container. It
> does even happen, when running it in a systemd-nspawn container, if
> the boot option isn't used, but if grep is run as user. Something is
> fishy, see [1].


Perhaps (in fact, probably) related to bug 26193 on grep? Please see
the thread on this at [1]. The fix was included in grep 3.1.

Cheers,

..C..


[1] https://lists.gnu.org/archive/html/bug-grep/2017-03/msg00009.html
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