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bug#30365: Offloading sometimes hangs

From: Ludovic Courtès
Subject: bug#30365: Offloading sometimes hangs
Date: Sat, 10 Feb 2018 12:07:13 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)


Ricardo Wurmus <address@hidden> skribis:

>> address@hidden (Ludovic Courtès) skribis:
>>> So what we have here is that the Scheme procedure ‘select’ returned
>>> stdin as “ready for reading”.  How did that happen?  I believe this is
>>> due to <https://bugs.gnu.org/30368>: ‘scm_i_prepare_to_wait_on_fd’
>>> returns 1, so ‘select’ returns EINTR but it does so without clearing the
>>> FD sets.
>> I’ve pushed a workaround here:
>> https://git.savannah.gnu.org/cgit/guix.git/commit/?id=8446dc5a360e3a13fecea870f86efdbd893e3905
>> and guix-0.14.0-8.bc880f9 includes that fix.
>> It’s been running for several hours on berlin, building a bunch of
>> things notably on aarch64, and it seems to work well!
> Congratulations on figuring this out!

Well it did show up again during the night.  :-/  So the problem appears
less frequently it seems, but it still appears.

A related issue is that ‘guix offload’ doesn’t time out in this case
but it probably should.


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