bug#41625: Sporadic guix-offload crashes due to EOF errors

[Marius Bakke <marius@gnu.org>]

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Marius Bakke <marius@gnu.org> writes:

> 'guix offload test' passes without problems.

Not so fast, running it in a loop reveals the crash.

There is a trace file in /root/offloadtest.trace on Berlin with such an
occurence.  It looks like a timeout is reached shortly before the EOF
error:

10139 poll([{fd=14, events=POLLIN|POLLOUT}], 1, 0) = 1 ([{fd=14, revents=POLLOUT}])
10139 poll([{fd=14, events=POLLIN}], 1, 15000) = 0 (Timeout)
10139 write(2, "Backtrace:\n", 11)      = 11

This seems to be from a different node than the one reported previously,
as the preceding connect() was to this machine:

10139 connect(44, {sa_family=AF_INET, sin_port=htons(22), sin_addr=inet_addr("141.80.167.186")}, 16) = -1 EINPROGRESS (Operation now in progress)

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