Re: bootstrap guile segfaults on powerpc 32-bit

[Efraim Flashner]

On Wed, Nov 06, 2019 at 06:35:09PM +0100, Ludovic Courtès wrote:
> Hi!
> 
> Efraim Flashner <address@hidden> skribis:
> 
> > I'm trying again to see about porting Guix to 32-bit powerpc and I've
> > come across a problem with the static guile. static guile has bin/
> > share/ and lib/ outputs. Looking at (gnu packages bootstrap), the
> > make-guile-wrapper function around line 377 takes its own bin/guile to
> > wrap itself in the code from share and the precompiled go files in lib/.
> > Unfortunately on powerpc I'm getting the error:
> >
> > /gnu/store/krb9h94g81f4xgsjwfs58p8fiir5gmpq-build-bootstrap-guile.sh: line 
> > 8:     5 Segmentation fault      GUILE_SYSTEM_PATH=$out/share/guile/2.2 
> > GUILE_SYSTEM_COMPILED_PATH=$out/lib/guile/2.2/ccache $out
> > /bin/guile -c "(begin (use-modules (ice-9 match)) (match (command-line) ((_ 
> > out bash) (let ((bin-dir (string-append out \"/bin\")) (guile 
> > (string-append out \"/bin/guile\")) (guile-real (string-append out
> >  \"/bin/.guile-real\")) (dollar (string (integer->char 36)))) (chmod 
> > bin-dir 493) (rename-file guile guile-real) (call-with-output-file guile 
> > (lambda (p) (format p \"#!~a\\nexport GUILE_SYSTEM_PATH=~a/sha
> > re/guile/2.2\\nexport 
> > GUILE_SYSTEM_COMPILED_PATH=~a/lib/guile/2.2/ccache\\nexec -a \\\"~a0\\\" ~a 
> > \\\"~a@\\\"\\n\" bash out out dollar guile-real dollar))) (chmod guile 365) 
> > (chmod bin-dir 365)))))" $out
> > /gnu/store/rbz12p3wl7dlrn5gyk6yp62ixmcir3vb-bash
> > /gnu/store/krb9h94g81f4xgsjwfs58p8fiir5gmpq-build-bootstrap-guile.sh: line 
> > 11:     6 Segmentation fault      $out/bin/guile --version
> > builder for 
> > `/gnu/store/cr6anc23kmprmilvyhi721b5b4sacln5-guile-bootstrap-2.2.drv' 
> > failed with exit code 139
> 
> Indeed, here’s what I see:
> 
> --8<---------------cut here---------------start------------->8---
> $ ./pre-inst-env guix build guile-static-stripped --target=powerpc-linux-gnu 
> 5.5 MB will be downloaded:
>    /gnu/store/nsscff8a2yic1x4cgdqlzd5829asln4w-guile-static-stripped-2.2.6
> substituting 
> /gnu/store/nsscff8a2yic1x4cgdqlzd5829asln4w-guile-static-stripped-2.2.6...
> downloading from 
> https://ci.guix.gnu.org/nar/lzip/nsscff8a2yic1x4cgdqlzd5829asln4w-guile-static-stripped-2.2.6...
>  guile-static-stripped-2.2.6  5.2MiB          2.2MiB/s 00:02 
> [##################] 100.0%
> 
> /gnu/store/nsscff8a2yic1x4cgdqlzd5829asln4w-guile-static-stripped-2.2.6
> $ qemu-ppc 
> /gnu/store/nsscff8a2yic1x4cgdqlzd5829asln4w-guile-static-stripped-2.2.6/bin/guile
>  -q
> guile: warning: failed to install locale
> qemu: uncaught target signal 11 (Segmentation fault) - core dumped
> Adres-eraro
> $ git log |head -1
> commit 198a7ac02fe52acfed996cb66d3c79e2e8595747
> --8<---------------cut here---------------end--------------->8---
> 
> I’d need a cross-gdb for powerpc-linux-gnu to actually get a backtrace,
> though.
> 
> Are you able to get a backtrace on the actual PowerPC machine?
> 

strace was easy to do, I have that attached. I haven't used gdb very
much. Here's the initial "I figured out how to make it do something":

(ins)efraim@g4:~/guile-static$ gdb -q ./bin/guile
Reading symbols from ./bin/guile...
(No debugging symbols found in ./bin/guile)
(ins)(gdb) run
Starting program: /home/efraim/guile-static/bin/guile
guile: warning: failed to install locale

Program received signal SIGSEGV, Segmentation fault.
0x10073d90 in ?? ()

I figured it was worth trying with other architectures, so I built
%guile-static-stripped for x86_64-linux:
./pre-inst-env guix build -e '(@@ (gnu packages make-bootstrap) 
%guile-static-stripped)'
but that one didn't have any problems. Now I'm building it for
i686-linux. After that I'll try again with the bootstrap-tarballs, but
i686-linux -> powerpc-linux and see if that changes anything.


> Thanks,
> Ludo’.

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