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References:	<CAFWoy7Feu05w0G=PLtwr1160sME8EVFvn57kNdCwxL3_phgzdg AT mail DOT gmail DOT com> <b9ea23d3-3ba7-f4eb-0f77-73c6cebaece9 AT SystematicSw DOT ab DOT ca>
In-Reply-To:	<b9ea23d3-3ba7-f4eb-0f77-73c6cebaece9@SystematicSw.ab.ca>
From:	Keith Christian <keith1christian AT gmail DOT com>
Date:	Fri, 9 Aug 2019 13:13:28 -0600
Message-ID:	<CAFWoy7EhSPDa4_g0y2CHNQWN-5vQaXhdA4BNcy7gy1Ni=APfwQ@mail.gmail.com>
Subject:	Re: tar 1.29 hangs, when run with strace, it exits with "illegal instruction"
To:	Brian DOT Inglis AT systematicsw DOT ab DOT ca, cygwin AT cygwin DOT com
X-IsSubscribed:	yes

Thanks for responding, Brian.

Cygwin is on a corporate machine so disabling anything will not be
easy or allowed.  Can you explain "bypass cygwin directories?"

Cygwin's tar worked recently so must be an "enhancement" in the
security software or some change in tar that is frowned upon.  I see
no evidence of Symantec Endpoint software, must be different AV
software.

On Wed, Aug 7, 2019 at 9:33 PM Brian Inglis
<Brian DOT Inglis AT systematicsw DOT ab DOT ca> wrote:
>
> On 2019-08-07 12:20, Keith Christian wrote:
> > I am able to run "tar ft somefile.tar" successfully on a Linux
> > machine, same tar version (1.29.)
> >
> > This version hangs up the terminal, does not respond to Ctrl-C or
> > Ctrl-Z, and terminates with an illegal instruction to the screen, not
> > reflected in the strace output.
> >
> > File cygwin_tar_1_29_illegal_instruction.txt is attached with strace
> > output, version, and "cygcheck tar" output.
>
> Works just fine for me:
>
> $ tar ft Downloads/nam.dist.tar
> README
> demo/
> ...
>
> You may have some http://www.cygwin.com/acronyms/#BLODA interfering like an AV.
>   The strace shows tar fails in sysfer.dll, which is part of Symantec Endpoint
> Protection CMC Firewall Application and Device Control, badly written from the
> number of complaints about it, and as usual with these control and monitoring
> products, they greatly slow down systems and interfere with work.
> Deinstall SEP or bypass your cygwin directories.
>
> --
> Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
>
> This email may be disturbing to some readers as it contains
> too much technical detail. Reader discretion is advised.
>
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