bug#20757: "unable to fork" on armhf

[Efraim Flashner]

I have an armhf marsboard that I'm trying to run guix on top of debian. I
started by flashing a debian wheezy image, stripping out most of the
packages, and upgrading to jessie. I installed using the 0.8.2 armhf binary.
`guix pull` failed with the error "unable to fork: Invalid argument", and
likewise `guix build hello` also failed.

I ran `sudo strace -o log /root/.guix-profile/bin/guix-daemon
--build-users-group=guix-builder &`  and `strace -o hello guix build hello`.
I've attached the guix-daemon log to the email and the hello log is at
https://flashner.co.il/~efraim/hello

uname -a:
Linux marsboard 3.0.36+ #67 SMP PREEMPT Sat Dec 13 10:01:50 HKT 2014 armv7l
GNU/Linux

ldd --version:
ldd (Debian GLIBC 2.19-18) 2.19

cat /proc/cpuinfo:
Processor       : ARMv7 Processor rev 0 (v7l)
processor       : 0
BogoMIPS        : 503.83

processor       : 1
BogoMIPS        : 503.83

Features        : swp falf thumb fastmult vfp edsp neon vfpv3
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0xc09
CPU revision    : 0

Hardware        : RK30board
Revision        : 0000
Serial          : 0000000000000000

-- 
Efraim Flashner   <address@hidden>   אפרים פלשנר
GPG key = A28B F40C 3E55 1372 662D  14F7 41AA E7DC CA3D 8351
Confidentiality cannot be guaranteed on emails sent or received unencrypted

log
Description: Binary data

pgpeZy9zzJGhq.pgp
Description: OpenPGP digital signature