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Subject: bug#48591: ugrep: illegal instruction
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Hi, I found another package, ugrep, which is evidently using native
instructions that do not work on my processor. When I run ugrep (e.g.,
`ugrep -Q') it immediately dies with error 'illegal instruction'.
However, if I pull the source with `guix build -S' and build and
install it to a local directory, it runs without trouble.

I'm sure this will also be a reproducibility bug, and plan on
submitting guix challenge results. However, the command I am running to
rebuild ugrep without grafts or substitutes is rebuilding everything
all the way back to bootstrap, so it probably will not be completed for
a day or two:

guix gc -D $(guix build --no-grafts ugrep); guix build --no-substitutes 
ugrep

Please compare similar bug 48373. It didn't seem worth the trouble of
running an object dump and figuring out which instruction is illegal,
but I could do that if required.

My system information:


christopher@nightshade ~$ grep 'flags' /proc/cpuinfo | head -n 1
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl
nonstop_tsc cpuid extd_apicid pni monitor cx16 popcnt lahf_lm
cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch
osvw ibs skinit wdt hw_pstate vmmcall npt lbrv svm_lock nrip_save

christopher@nightshade ~$ neofetch --stdout
christopher@nightshade 
---------------------- 
OS: Guix System d4ffa9630277fa8699c783c08381d688626d4bc3 x86_64 
Host: GA-880GM-UD2H 
Kernel: 5.12.5-gnu 
Uptime: 1 hour, 30 mins 
Packages: 107 (guix-system), 93 (guix-user) 
Shell: bash 5.0.16 
Resolution: 1920x1200 
DE: GNOME 3.34.5 
Theme: Adwaita [GTK2/3] 
Icons: Adwaita [GTK2/3] 
Terminal: kitty 
CPU: AMD Athlon II X3 455 (3) @ 3.300GHz 
GPU: NVIDIA GeForce 8400 GS Rev. 3 
Memory: 1573MiB / 7957MiB 

christopher@nightshade ~$ guix describe
Generation 5	May 22 2021 09:43:30	(current)
  guix d4ffa96
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: d4ffa9630277fa8699c783c08381d688626d4bc3


-- 
Christopher Howard
blog: https://librehacker.com
social: https://gnusocial.club/librehacker

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<html dir=3D"ltr"><head></head><body style=3D"text-align:left; direction:lt=
r;"><div>Hi, I found another package, ugrep, which is evidently using nativ=
e instructions that do not work on my processor. When I run ugrep (e.g., `u=
grep -Q') it immediately dies with error 'illegal instruction'. However, if=
 I pull the source with `guix build -S' and build and install it to a local=
 directory, it runs without trouble.</div><div><br></div><div>I'm sure this=
 will also be a reproducibility bug, and plan on submitting guix challenge =
results. However, the command I am running to rebuild ugrep without grafts =
or substitutes is rebuilding everything all the way back to bootstrap, so i=
t probably will not be completed for a day or two:</div><div><br></div><div=
>guix gc -D $(guix build --no-grafts ugrep); guix build --no-substitutes ug=
rep</div><div><br></div><div>Please compare similar bug 48373. It didn't se=
em worth the trouble of running an object dump and figuring out which instr=
uction is illegal, but I could do that if required.</div><div><br></div><di=
v>My system information:</div><div><br></div><div></div><div><a href=3D"mai=
lto:christopher@nightshade">christopher@nightshade</a> ~$ grep 'flags' /pro=
c/cpuinfo | head -n 1</div><div>flags		: fpu vme de pse tsc msr pae mce cx8=
 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall =
nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good n=
opl nonstop_tsc cpuid extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legac=
y svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skini=
t wdt hw_pstate vmmcall npt lbrv svm_lock nrip_save</div><div><br></div><di=
v><a href=3D"mailto:christopher@nightshade">christopher@nightshade</a> ~$ n=
eofetch --stdout</div><div><a href=3D"mailto:christopher@nightshade">christ=
opher@nightshade</a>&nbsp;</div><div>----------------------&nbsp;</div><div=
>OS: Guix System d4ffa9630277fa8699c783c08381d688626d4bc3 x86_64&nbsp;</div=
><div>Host: GA-880GM-UD2H&nbsp;</div><div>Kernel: 5.12.5-gnu&nbsp;</div><di=
v>Uptime: 1 hour, 30 mins&nbsp;</div><div>Packages: 107 (guix-system), 93 (=
guix-user)&nbsp;</div><div>Shell: bash 5.0.16&nbsp;</div><div>Resolution: 1=
920x1200&nbsp;</div><div>DE: GNOME 3.34.5&nbsp;</div><div>Theme: Adwaita [G=
TK2/3]&nbsp;</div><div>Icons: Adwaita [GTK2/3]&nbsp;</div><div>Terminal: ki=
tty&nbsp;</div><div>CPU: AMD Athlon II X3 455 (3) @ 3.300GHz&nbsp;</div><di=
v>GPU: NVIDIA GeForce 8400 GS Rev. 3&nbsp;</div><div>Memory: 1573MiB / 7957=
MiB&nbsp;</div><div><br></div><div><a href=3D"mailto:christopher@nightshade=
">christopher@nightshade</a> ~$ guix describe</div><div>Generation 5	May 22=
 2021 09:43:30	(current)</div><div>&nbsp; guix d4ffa96</div><div>&nbsp;&nbs=
p;&nbsp;&nbsp;repository URL: <a href=3D"https://git.savannah.gnu.org/git/g=
uix.git">https://git.savannah.gnu.org/git/guix.git</a></div><div>&nbsp;&nbs=
p;&nbsp;&nbsp;branch: master</div><div>&nbsp;&nbsp;&nbsp;&nbsp;commit: d4ff=
a9630277fa8699c783c08381d688626d4bc3</div><div><br></div><div><span><pre>--=
 <br></pre><div>Christopher Howard</div><div>blog: <a href=3D"https://libre=
hacker.com">https://librehacker.com</a></div><div>social: <a href=3D"https:=
//gnusocial.club/librehacker">https://gnusocial.club/librehacker</a></div><=
/span></div></body></html>

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Christopher Howard <christopher@HIDDEN>
Subject: bug#48591: Acknowledgement (ugrep: illegal instruction)
Message-ID: <handler.48591.B.16217147918570.ack <at> debbugs.gnu.org>
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Date: Sat, 22 May 2021 20:20:02 +0000

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Subject: bug#48591: ugrep: illegal instruction
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christopher@nightshade ~$ guix challenge ugrep
/gnu/store/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep-3.1.12 contents
differ:
  local hash: 1yf9752hprihmhwnqlhaffkmwmkd3scwzr8dqy7d78vcy70qjkn6
  
https://ci.guix.gnu.org/nar/lzip/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep-3.1.12
: 1ifdjmscb07pacxwcs2408zi12yrxxf0zdwzz800xlccp5x53m7r
  differing file:
    /bin/ugrep

1 store items were analyzed:
  - 0 (0.0%) were identical
  - 1 (100.0%) differed
  - 0 (0.0%) were inconclusive

-- 
Christopher Howard
blog: https://librehacker.com
social: https://gnusocial.club/librehacker

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<html dir=3D"ltr"><head></head><body style=3D"text-align:left; direction:lt=
r;"><div><a href=3D"mailto:christopher@nightshade">christopher@nightshade</=
a> ~$ guix challenge ugrep</div><div>/gnu/store/a6x7rv7xi3d2pw205znmnha9qfj=
rvs7k-ugrep-3.1.12 contents differ:</div><div>&nbsp; local hash: 1yf9752hpr=
ihmhwnqlhaffkmwmkd3scwzr8dqy7d78vcy70qjkn6</div><div>&nbsp; <a href=3D"http=
s://ci.guix.gnu.org/nar/lzip/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep-3.1.12"=
>https://ci.guix.gnu.org/nar/lzip/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep-3.=
1.12</a>: 1ifdjmscb07pacxwcs2408zi12yrxxf0zdwzz800xlccp5x53m7r</div><div>&n=
bsp; differing file:</div><div>&nbsp;&nbsp;&nbsp;&nbsp;/bin/ugrep</div><div=
><br></div><div>1 store items were analyzed:</div><div>&nbsp; - 0 (0.0%) we=
re identical</div><div>&nbsp; - 1 (100.0%) differed</div><div>&nbsp; - 0 (0=
.0%) were inconclusive</div><div><br></div><div><span><pre>-- <br></pre><di=
v>Christopher Howard</div><div>blog: <a href=3D"https://librehacker.com">ht=
tps://librehacker.com</a></div><div>social: <a href=3D"https://gnusocial.cl=
ub/librehacker">https://gnusocial.club/librehacker</a></div></span></div></=
body></html>

--=-DNXE7ND+SBaBL110jLEF--

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Subject: bug#48591: ugrep: illegal instruction
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On Sat, May 22, 2021 at 12:19:30PM -0800, Christopher Howard wrote:
> However, the command I am running to
> rebuild ugrep without grafts or substitutes is rebuilding everything
> all the way back to bootstrap, so it probably will not be completed for
> a day or two:
> 
> guix gc -D $(guix build --no-grafts ugrep); guix build --no-substitutes 
> ugrep

Do this instead:

$ guix environment --no-grafts ugrep -- guix build --no-grafts --no-substitutes ugrep

That way, you can use substitutes for ugrep's dependencies, but then
build ugrep from source.

I hope it helps!

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On Mon, 24 May 2021 13:22:23 -0400
Leo Famulari <leo@HIDDEN> wrote:

> On Sat, May 22, 2021 at 12:19:30PM -0800, Christopher Howard wrote:
> > However, the command I am running to
> > rebuild ugrep without grafts or substitutes is rebuilding everything
> > all the way back to bootstrap, so it probably will not be completed
> > for a day or two:
> > 
> > guix gc -D $(guix build --no-grafts ugrep); guix build
> > --no-substitutes ugrep  
> 
> Do this instead:
> 
> $ guix environment --no-grafts ugrep -- guix build --no-grafts
> --no-substitutes ugrep
> 
> That way, you can use substitutes for ugrep's dependencies, but then
> build ugrep from source.
> 
> I hope it helps!
> 
> 
> 

TIL about that. There really ought to be a more obvious way to do that.

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On Wed, Jun 30, 2021 at 11:41:11PM +0200, raingloom wrote:
> TIL about that. There really ought to be a more obvious way to do that.

Agreed! It's a common use case.

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Hi,

On Sat, 22 May 2021 at 12:19, Christopher Howard <christopher@HIDDEN=
om> wrote:

> I'm sure this will also be a reproducibility bug,

Indeed, the package =E2=80=99ugrep=E2=80=99 is not reproducible:

 guix build ugrep --no-grafts -q
 guix build ugrep --no-grafts -q --check -K
 diff --no-dereference -r /gnu/store/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep=
-3.1.12{,-check}
 Binary files /gnu/store/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep-3.1.12/bin/=
ugrep and /gnu/store/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep-3.1.12-check/bi=
n/ugrep differ

The next step is to investigate with diffoscope.


Well, another data point =E2=80=93 maybe Berlin has an issue =E2=80=93 beca=
use I get:

  guix challenge ugrep --substitute-urls=3D"https://ci.guix.gnu.org https:/=
/bordeaux.guix.gnu.org"
  /gnu/store/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep-3.1.12 contents differ:
    local hash: 1ifdjmscb07pacxwcs2408zi12yrxxf0zdwzz800xlccp5x53m7r
    https://ci.guix.gnu.org/nar/lzip/a6x7rv7xi3d2pw205znmnha9qfjrvs7k-ugrep=
-3.1.12: 1ifdjmscb07pacxwcs2408zi12yrxxf0zdwzz800xlccp5x53m7r
    https://bordeaux.guix.gnu.org/nar/lzip/a6x7rv7xi3d2pw205znmnha9qfjrvs7k=
-ugrep-3.1.12: 1yf9752hprihmhwnqlhaffkmwmkd3scwzr8dqy7d78vcy70qjkn6

  guix hash -r $(guix build --no-grafts ugrep)-check
  1yf9752hprihmhwnqlhaffkmwmkd3scwzr8dqy7d78vcy70qjkn6

I fetch by default the substitutes from ci that why =E2=80=9Clocal hash=E2=
=80=9C and ci
are the same; but my local build with =E2=80=98guix build --check=E2=80=99 =
gives the
same hash as bordeaux.


All the best,
simon

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retitle 48591 ugrep: reproducibility issues
quit

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Date: Mon, 16 Jan 2023 20:37:27 -0500
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Is this bug fixed yet?

If not, seeing that this issue was motivated by an illegal instruction, 
we can use compile flags to disable SSE and other platform-dependent 
optimizations and investigate further.

WDYT?

https://github.com/Genivia/ugrep#other-platforms-step-3-build

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On 2023-01-16, kiasoc5 wrote:
> Is this bug fixed yet?
>
> If not, seeing that this issue was motivated by an illegal instruction,=20
> we can use compile flags to disable SSE and other platform-dependent=20
> optimizations and investigate further.
>
> WDYT?
>
> https://github.com/Genivia/ugrep#other-platforms-step-3-build

=2D-disable-sse2 disable SSE2 and AVX optimizations
=2D-disable-avx2 disable AVX2 and AVX512BW optimizations, but compile with =
SSE2 when supported
=2D-disable-neon disable ARM NEON/AArch64 optimizations

Seems like --disable-sse2 on x86_64 and x86 (32-bit) and --disable-neon
(armhf, maybe aarch64) would be needed to make the build independent of
which cpu it runs on.


FWIW, debian disables several of these (--disable-sse2 and
=2D-disable-neon), although also passes --disable-avx which is not mentione=
d in
the upstream documentation, although is present in configure.ac...

  https://salsa.debian.org/debian/ugrep/-/blob/7e2383dfaec23d58587f53c31ce4=
6ef884513975/debian/rules#L5-13


live well,
  vagrant

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