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Message-ID: <7b9cb974-fef4-5681-0139-d7a6cdaaa688@SystematicSw.ab.ca>
Date: Mon, 6 Jun 2022 10:45:05 -0600
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Subject: Re: [EXT] Re: possible grep V3.7 issue
To: cygwin AT cygwin DOT com
References: <MN2PR13MB388514876921EBCBC0BB38FA88D79 AT MN2PR13MB3885 DOT namprd13 DOT prod DOT outlook DOT com>
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From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Organization: Systematic Software
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On 2022-06-06 06:41, Gordon Grimes via Cygwin wrote:
> On Monday, June 6, 2022 8:34 AM, Eliot Moss wrote:
>> On 6/6/2022 8:26 AM, Gordon Grimes via Cygwin wrote:
>>> I wanted to let you know about a possible issue I found in grep 
>>> v3.7. I run Cygwin and recently downgraded ‘grep’ to v3.6 from 
>>> v3.7 to address a performance issue (shown below). I just thought
>>> you’d want to know  (V3.6 is working well, so I’m in a good place 😊)
>>> % time echo hi | grep h
>>> hi
>>> real    0m7.442s
>>> user    0m0.030s
>>> sys     0m6.576s
>>> % /usr/bin/grep --version
>>> grep (GNU grep) 3.7
>>> Packaged by Cygwin (3.7-2)
>>> Copyright (C) 2021 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgnu.org%2Flicenses%2Fgpl.html&amp;data=05%7C01%7CGordon.Grimes%40nortonlifelock.com%7C640f66e158104f7486ea08da47b8e328%7C94986b1d466f4fc0ab4b5c725603deab%7C0%7C0%7C637901156666044572%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=FujGNPbnS6TMO8I1RT%2FuczWHhImX6KnEUnLWC5EYYTE%3D&amp;reserved=0.
>>> This is free software: you are free to change and redistribute it.
>>> There is NO WARRANTY, to the extent permitted by law.
>>> Written by Mike Haertel and others; see
>>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.sv.gnu.org%2Fcgit%2Fgrep.git%2Ftree%2FAUTHORS&amp;data=05%7C01%7CGordon.Grimes%40nortonlifelock.com%7C640f66e158104f7486ea08da47b8e328%7C94986b1d466f4fc0ab4b5c725603deab%7C0%7C0%7C637901156666044572%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=yXCYAppkPpbDwkD1h2BPA%2B5PPE6QYLRvmVHxvUwxP34%3D&amp;reserved=0.
>>> After the downgrade…
>>> % time echo hi | grep h
>>> hi
>>> real    0m0.292s
>>> user    0m0.015s
>>> sys     0m0.124s

>> I'm running 3.7-2 and get timing similar to what you give for 3.6:
>> real    0m0.167s
>> user    0m0.015s
>> sys     0m0.061s
>> Not sure what to say unless, if I downgraded, it would be an order
>> of magnitude faster ... I wonder if maybe the new version triggers
>> some anti-virus activity or something like that.
> I suspected this wasn't 100% reproducible or else it'd have been > 
> reported/addressed by now. As you say, perhaps there's some 
> idiosyncrasy with my system/setup. If there's a wave of reporting a 
> similar issue then perhaps it's worth a look (e.g. perhaps a recent
> MS update triggered this). Anyway, unless/until that happens, I'll
> simply stick with V3.6.
Not seeing any significant differences, over the timing granularity on 
Windows, between the installed or either of the built versions:

$ grep --version
grep (GNU grep) 3.7
Packaged by Cygwin (3.7-2)
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<https://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 Mike Haertel and others; see
<https://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS>.
$ time echo hi
hi
real    0m0.000s
user    0m0.000s
sys     0m0.000s
$ time echo hi | grep hi
hi
real    0m0.226s
user    0m0.000s
sys     0m0.139s
$ time grep hi <<< hi
hi
real    0m0.214s
user    0m0.046s
sys     0m0.061s
$ time grep-3.6-1.x86_64/inst/usr/bin/grep hi <<< hi
hi
real    0m0.203s
user    0m0.015s
sys     0m0.094s
$ time echo hi | grep-3.6-1.x86_64/inst/usr/bin/grep hi
hi
real    0m0.198s
user    0m0.030s
sys     0m0.046s
$ time grep-3.7-2.x86_64/inst/usr/bin/grep hi <<< hi
hi
real    0m0.214s
user    0m0.015s
sys     0m0.124s
$ time echo hi | grep-3.7-2.x86_64/inst/usr/bin/grep hi
hi
real    0m0.287s
user    0m0.030s
sys     0m0.123s

Please try running commands like the above to see if any other obvious 
anomalies appear in timing, and also:

$ cygcheck /bin/bash /bin/grep
C:/.../bin/bash.exe
   C:/.../bin/cygwin1.dll
     C:/WINDOWS/system32/KERNEL32.dll
       C:/WINDOWS/system32/ntdll.dll
       C:/WINDOWS/system32/KERNELBASE.dll
   C:/.../bin/cygiconv-2.dll
   C:/.../bin/cygintl-8.dll
   C:/.../bin/cygreadline7.dll
     C:/.../bin/cygncursesw-10.dll

C:/.../bin/grep.exe
   C:/.../bin/cygwin1.dll
     C:/WINDOWS/system32/KERNEL32.dll
       C:/WINDOWS/system32/ntdll.dll
       C:/WINDOWS/system32/KERNELBASE.dll
   C:/.../bin/cygintl-8.dll
     C:/.../bin/cygiconv-2.dll
   C:/.../bin/cygpcre-1.dll

to see if any other obvious anomalies appear such as paths other than 
Windows/System32 and your Cygwin /bin/, or DLLs other than base Windows 
or Cygwin locale, I/O, or search.

Try running grep under strace, and look in the first column of the 
output for large time deltas (the second column is cumulative thread or 
process time) e.g.:

$ strace -o grep.strace grep hi <<< hi
hi
$ awk '$1 > 1000' grep.strace
  5864    6350 [main] grep (4000) sigprocmask: 0 = sigprocmask (0, 0x0, 
0x180323570)
  2157   30776 [main] grep 520 handle_to_fn: current match 'C:' = 
'\Device\HarddiskVolume2'
11188   44322 [main] grep 520 build_fh_pc: created an archetype 
(0x180350A90) for /dev/cons0(3/0)
  1909   51867 [main] grep 520 open: 
open(/usr/share/locale/locale.alias, 0x0)
  2933   65187 [main] grep 520 read: read(3, 0x800085510, 65536) blocking
  3581   69642 [main] grep 520 open: 
open(/usr/share/locale/en_CA.ISO8859-1/LC_MESSAGES/grep.mo, 0x10000)
  1713   87197 [main] grep 520 open: 
open(/usr/share/locale/en_GB.ISO8859-1/LC_MESSAGES/grep.mo, 0x10000)
  1808   97122 [main] grep 520 open: open(/proc/self/maps, 0x0)
  7609  105898 [main] grep 520 mmap64: addr 0x0, len 327680, prot 0x3, 
flags 0x22, fd -1, off 0x0
  4845  110951 [main] grep 520 munmap: munmap (addr 0x6FFFFFFB0000, len 
327680)
  1103  152703 [main] grep 520 fhandler_base::set_flags: flags 0x18000, 
supplied_bin 0x0
  6919  160062 [main] grep 520 mmap64: addr 0x0, len 327680, prot 0x3, 
flags 0x22, fd -1, off 0x0
  4692  165018 [main] grep 520 munmap: munmap (addr 0x6FFFFFFA0000, len 
327680)
  1103  204304 [main] grep 520 lseek64: 0 = lseek(3, 0, 0)
  4862  212220 [main] grep 520 fhandler_base::fstat_helper: 0 = fstat 
(\??\C:\$Extend\$Deleted\005C00000051F76035B2E0D4, 0xFFFFC870) 
st_size=0, st_mode=040600, 
st_ino=25895697862752096st_atim=629E2C2B.913C4C4 
st_ctim=629E2C2B.913C4C4 st_mtim=629E2C2B.913C4C4 
st_birthtim=629E2C2B.913C4C4
28876  244184 [main] grep 520 fhandler_console::free_console: freed 
console, res 1

and if you see any, look around those lines for traces of alien code 
injection.

Some alien Norton product seems to have been injected above, so that is 
a likely culprit, until someone complains about its effect on 
performance, and gets Cygwin bash, grep 3.7, etc. added to its bypass 
list; see the FAQ:

	https://cygwin.com/faq/faq.html#faq.using.bloda.

-- 
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.
[Data in binary units and prefixes, physical quantities in SI.]

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