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Date:      Fri, 13 Nov 2020 10:51:43 -0800
From:      Pete Wright <pete@nomadlogic.org>
To:        Patrick Mahan <plmahan@gmail.com>
Cc:        questions list <freebsd-questions@freebsd.org>
Subject:   Re: Helping understand cause of SIGSEGV
Message-ID:  <db901f77-cc64-46ee-0034-5f3d9005527a@nomadlogic.org>
In-Reply-To: <46c6e046-8786-8142-0e4f-7c5ec407b3f4@nomadlogic.org>
References:  <c2eab4b0-b10b-9db3-1aa3-1f61689e24e8@nomadlogic.org> <CAFDHx1Jg_9k3oWU8X-WdP2CJX8hnBYgMz%2BvxwOs766JZcM3WRQ@mail.gmail.com> <0764e7ef-bd81-a6c5-47c4-7cd539a428f5@nomadlogic.org> <CAFDHx1K2-RWS4=xYtNUKMV3t_J7OKKPUE56f9JY45Q%2B0nH_TFA@mail.gmail.com> <f51dfaf6-46da-9cd8-ea37-b2733f5ad9bc@nomadlogic.org> <CAFDHx1JDyJq%2Bsepz1O186AeijTqyXP6AuQajsETY00j5eAsLXQ@mail.gmail.com> <46c6e046-8786-8142-0e4f-7c5ec407b3f4@nomadlogic.org>

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On 11/7/20 4:12 PM, Pete Wright wrote:
>
>
>
> thanks for your help on the Patrick - i suspect to make much more 
> progress i'll need someone from the fluent-bit team to take a closer 
> look as to what's happening.
>

Just to revive this thread, Artyom Davidov was nice enough to chime in 
on the freebsd bug i filed for this 
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250825) and we made 
some progress.  it looks like the SIGSEGV is only reproducible on 12.x 
and newer FreeBSD builds - he is unable to reproduce the issue on his 
11.4 system.

I guess my next question I'll need to answer is what major changes 
happened b/w 11 and 12 that could trigger this error.  At first I was 
wondering if it was an issue with llvm, but this port is built using 
gcc, so that helps narrow the gap a little bit.  i reckon it's also good 
that we at least have a version of freebsd that is functional, so there 
is a reference point to start from.

since it is looking like a threading issue perhaps i should start 
splunking around that area...unless others have some good hints.

-pete

-- 
Pete Wright
pete@nomadlogic.org
@nomadlogicLA




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