[Bug 234576] hastd exits ungracefully

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234576

Paul Thornton <freebsd-bugzilla at prt.org> changed:

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--- Comment #1 from Paul Thornton <freebsd-bugzilla at prt.org> ---
I see exactly the same hastd issue on 12.0-RELEASE-p2, with hast directly on
top of the drives (no partitions) - I don't think that specifically is your
problem.  HAST seems to be broken in some other way with 12.0

However, my setup is slightly complicated as I have a zpool using GELI devices,
running above HAST.  I am currently doing some testing to reduce this to the
simplest reproducible setup to remove everything else, and then turn up some
debugging.

What I've noted so far is:
1) All of the hastd worker threads die virtually simultaneously.
2) This doesn't appear happen immediately you start writing data, but a very
short while afterwards (order of a few seconds).

As a side note for anyone else reading, I had issues making HAST work reliably
in my setup under 11 as well, but this was easier to track down and patch.  The
high level problem I found there was that ggate_recv received more data than
MAXPHYS and the "impossible" condition of ENOMEM happened (line 1264 of
primary.c).  After adding some logging here, I "fixed" this by setting
gctl_length to MAXPHYS + 0x200 in both primary.c and secondary.c which stopped
the problem; this isn't exactly elegant but it worked OK for me.

The issue reported in this bug seems unrelated to that.

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