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Reply-To:	Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject:	Re: "/usr/bin/tar.exe" hangs, Windows 10, CYGWIN_NT-10.0 3.0.7(0.338/5/3) 2019-04-30 18:08 x86_64
To:	cygwin AT cygwin DOT com
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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Date:	Fri, 15 Nov 2019 10:34:26 -0700
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On 2019-11-15 08:12, Keith Christian wrote:
> On Fri, Nov 15, 2019 at 7:40 AM Ken Brown wrote:
>> On 11/15/2019 9:19 AM, Keith Christian wrote:
>>> Tar in recent updates to Cygwin64 hangs.
>>> When the tar command is run with strace, it generates voluminous
>>> output but won't list tar file contents or extract the tar file (or
>>> tar.gz, tar.xz, etc.)
>>> $ tar --version
>>> tar (GNU tar) 1.29
>>> Packaged by Cygwin (1.29-1)
>>> Copyright (C) 2015 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
>>> This is free software: you are free to change and redistribute it.
>>> There is NO WARRANTY, to the extent permitted by law.
>>> Written by John Gilmore and Jay Fenlason.
>>> $ ls -l /usr/bin/tar.exe
>>> -rwxr-xr-x 1 kchris0000 Domain Users 424979 Dec  8  2016 /usr/bin/tar.exe
>>> Could someone check this please?

$ TZ=UTC ls -glo --full /bin/tar
-rwxr-xr-x 1 424979 2016-12-09 03:57:55.000000000 +0000 /bin/tar

so not a recent Cygwin update.

>> Works for me.  Could you have some anti-virus software that's interfering?  Look
>> for suspicious DLLs in the strace output.

> These are the DLL's in the strace output, expanded with "ldd."  I
> don't see anything out of the ordinary.
> 
> Is there a list of DLL's known to cause problems with Cygwin?
> 
> How would I better isolate the problem causing DLL?  Specific verbiage
> in the strace output?  Should I run strace with the "-a" option?

This is normal output:

$ ldd /bin/tar
        ntdll.dll => /proc/cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll (0x7ff93d530000)
        KERNEL32.DLL => /proc/cygdrive/c/WINDOWS/System32/KERNEL32.DLL
(0x7ff93abf0000)
        KERNELBASE.dll => /proc/cygdrive/c/WINDOWS/System32/KERNELBASE.dll
(0x7ff93a310000)
        cygwin1.dll => /usr/bin/cygwin1.dll (0x180040000)
        cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x3d8c50000)
        cygintl-8.dll => /usr/bin/cygintl-8.dll (0x3c8230000)

>      1          CRYPTBASE.DLL =>

>      4          RPCRT4.dll => /cygdrive/c/WINDOWS/System32/RPCRT4.dll
> (0x7fff46070000)
>      5          SYSFER.DLL => /cygdrive/c/WINDOWS/System32/SYSFER.DLL
> (0x5a0b0000)
>      6          advapi32.dll =>
> /cygdrive/c/WINDOWS/System32/advapi32.dll (0x7fff45530000)
>      7          bcryptPrimitives.dll =>
> /cygdrive/c/WINDOWS/System32/bcryptPrimitives.dll (0x7fff44020000)
>      8          bcryptprimitives.dll =>
> /cygdrive/c/WINDOWS/System32/bcryptprimitives.dll (0x7fff44020000)

>     11          msvcrt.dll => /cygdrive/c/WINDOWS/System32/msvcrt.dll
> (0x7fff444c0000)

>     13          psapi.dll => /cygdrive/c/WINDOWS/System32/psapi.dll
> (0x7fff44790000)
>     14          rpcrt4.dll => /cygdrive/c/WINDOWS/System32/rpcrt4.dll
> (0x7fff46070000)
>     15          sechost.dll =>

SYSFER.DLL is Broadcom/Symantec Endpoint Protection (SEP) AV/BLODA, which pulls
in all this other stuff, including MS VC RT, to clash with Cygwin, while
reporting back to corporate, hogging CPU and I/O to do so, slowing your system
to a crawl.

Uninstall it, bypass checking under the Cygwin tree, or don't use Cygwin.
If you feel a need for protection, Windows Defender is adequate; most AV
products are overkill, and kill system performance.

If this is in an org, complain (to your and their manager/VP) about the
interference stopping you doing your work, and make them fix it, so they
remember to do so in future, otherwise you may have problems and have to
complain and wait every time they upgrade.

-- 
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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