Re: lib/56239 (lib/libc/regex/t_exhaust:regcomp_too_big test fails)

[Andreas Gustafsson <gson%NetBSD.org@localhost>]

The following reply was made to PR lib/56239; it has been noted by GNATS.

From: Andreas Gustafsson <gson%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: christos%NetBSD.org@localhost
Subject: Re: lib/56239 (lib/libc/regex/t_exhaust:regcomp_too_big test fails)
Date: Wed, 9 Jun 2021 09:36:43 +0300

 I tried running the test case in a loop:
 
   cd /usr/tests/lib/libc/regex
   i=0; while ./t_exhaust regcomp_too_big; do i=$(expr $i + 1); echo $i; done
 
 using sources from immediately before and after the commit identified
 in the original PR, in a qemu amd64 VM with 512 MB RAM.  Results:
 
   source date 2021.02.23.21.59.31: no failure after more than 300,000 runs
 
   source date 2021.02.23.22.14.59: failed after 21 runs
 
 Also, the successful runs took 5-10x longer in the latter case, up from
 about 100 ms per run to 500-1000 ms per run.
 -- 
 Andreas Gustafsson, gson%NetBSD.org@localhost