ppc: failed contrib: concurrency

[Christoph Egger]

Hi!

SBCL on PowerPC seems to consistently fail concurrency on 1.3.10

https://buildd.debian.org/status/fetch.php?pkg=sbcl&arch=powerpc&ver=2%3A1.3.10-2&stamp=1477438260

Observed also on

% uname -a
Linux partch 3.16.0-4-powerpc64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) ppc64 GNU/Linux

% lscpu
Architecture: ppc64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Big Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 4
Core(s) per socket: 1
Socket(s): 2
NUMA node(s): 1
Model: IBM,8231-E2B
Hypervisor vendor: pHyp
Virtualization type: para
L1d cache: 32K
L1i cache: 32K
NUMA node0 CPU(s): 0-7

Host is SBCL 1.3.8

[Christoph Egger (christoph-egger)]

I got a patch a while back which was seemingly not necessary in 1.3.8 (or is this witnessing the race?) and makes my build go through on ppc

[Christoph Egger (christoph-egger)]

just to be clear: got the patch in IRC, it's not from me

[Sébastien Villemot (sebastien-villemot)]

I just removed this patch from the Debian package for 1.4.5 but this was apparently a bad idea, see:

 https://buildd.debian.org/status/fetch.php?pkg=sbcl&arch=powerpc&ver=2%3A1.4.5-1&stamp=1519843948&raw=0

(note that 1.4.4 was building fine on powerpc with the patch applied).

Should I reinstate the patch? I don't feel comfortable with this patch because it is not clear where it comes from, still it seems to fix a real issue. Could it be possible to get some feedback?

Thanks,