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Re: [platform-testers] bug#21755: new snapshot available: grep-2.21.82-f

From: Bruce Dubbs
Subject: Re: [platform-testers] bug#21755: new snapshot available: grep-2.21.82-fbc5
Date: Sun, 25 Oct 2015 18:02:26 -0500
User-agent: Mozilla/5.0 (X11; Linux i686; rv:35.0) Gecko/20100101 Firefox/35.0 SeaMonkey/2.32

Paul Eggert wrote:
Bruce Dubbs wrote:
I would think that the tests in grep should account for both pcre and
pcre2, at
least for a couple of years.

Grep currently supports only PCRE.  I'd be surprised if it worked with

My test was with PCRE 8.35 with Debian and Ubuntu patches (I'm
up-to-date with Ubuntu 15.10 on x86-64).  Yours was with 8.37, I assume
with no patches. Perhaps if I find the time I can try building PCRE 8.37
on Ubuntu 15.10 and see whether it exhibits the bug, but to be honest I
was hoping someone else could debug this.  Perhaps you can try it with
8.35 on linuxfromscratch?

Yes, I can do that. The main Upstream repo doesn't have 8.35, but it was at sourceforge. I installed that:

-rwxr-xr-x 1 root root 762440 Oct 25 17:43 /lib/

but the pcre-jitstack test still aborts with a segfault. I could try with a smaller pcrejit.txt file if that would help.

OK, I think I have it.  I had a default ulimit:

stack size              (kbytes, -s) 8192

when I changed that to unlimited, the test passed. More testing and ulimit -s 16000 fails but ulimit -s 32000 passes.

I assume you're doing your test on x86-64?  (Sorry, don't recall.)


Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                12
On-line CPU(s) list:   0-11
Thread(s) per core:    2
Core(s) per socket:    6
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 63
Model name:            Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz

  -- Bruce

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