Bug#819278: llvm-toolchain-3.8: Build not reliable

[Santiago Vila]

severity 819278 serious
thanks

Well, I tried to build this package four times already, and it always
failed, so it's not that it "does not build reliably", but instead
it "realiably does not build", or FTBFS for short.

In every case I was using sbuild triggered by a cron job.

In the first two cases the build was done in a KVM virtual machine.
In the last two cases the build was done in an Azure virtual machine.

In the last case I disabled eatmydata and it also failed, so eatmydata
is not the reason to fail.

I attach the four build logs in full.

Feel free to ask anything which may help you to reproduce the bug.

Thanks.
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