[Pkg-rust-maintainers] help with diagnosing rust SEGV on powerpc (using porterbox perotto.debian.net)

[Daniel Kahn Gillmor]

Hi PowerPC porters--

i'm trying to debug a build failure on powerpc using a porterbox:

https://buildd.debian.org/status/fetch.php?pkg=rust-nettle-sys&arch=powerpc&ver=2.0.4-2&stamp=1580935398&raw=0

Upstream is helpful and responsive but i'm getting a bit stuck on the
porterbox itself:

https://gitlab.com/sequoia-pgp/nettle-sys/-/issues/8

i am trying to read a backtrace that segfaults in libc's strlen, but gdb
doesn't see any symbols for libc so i can't view the arguments properly.

In particular, i can't seem to get the libc6-powerpc-dbgsym package
installed within the chroot, depsite it being available outside the
chroot:


```
dkg at perotto:~$ schroot -r -c $sessionid 
(sid_powerpc-dchroot)dkg at perotto:~$ dpkg --print-architecture
powerpc
(sid_powerpc-dchroot)dkg at perotto:~$ apt search 'libc6.*dbgsym'
Sorting... Done
Full Text Search... Done
libc6-ppc64-dbgsym/unstable,now 2.29-10 powerpc [installed]
  debug symbols for libc6-ppc64

(sid_powerpc-dchroot)dkg at perotto:~$ logout
dkg at perotto:~$ apt search 'libc6.*dbgsym'
Sorting... Done
Full Text Search... Done
libc6-powerpc-dbgsym/unstable 2.29-10 ppc64
  debug symbols for libc6-powerpc

libc6-ppc64-dbgsym/unstable 2.29-10 powerpc
  debug symbols for libc6-ppc64

dkg at perotto:~$ 
```

Any thoughts about what's going on here?

Please Cc me, i'm not subscribed.

       --dkg
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