Hey,

For the Guix Data Service, I've noticed some builds getting stuck
recently. It seems to be when qemu-arm is used to run foreign binaries,
often grep during the git-minimal tests. Currently it's stuck running
gcc during the configure phase for the Guix package.

Attaching strace to the stuck process shows the following output in a
loop, mmap followed by munmap:

mmap(0xab897cd96000, 4294901760, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x7ffef0010000
mmap(0x7ffff0000000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffff70c1000
munmap(0x7ffff70c1000, 4096)            = 0
munmap(0x7ffef0010000, 4294901760)      = 0


I'm guessing this is probably an issue with QEMU, but I was wondering if
anyone has seen similar behaviour?

Thanks,

Chris