[Bug 205708] Kernel panic possibly happening while adding/removing/listing ZFS snapshot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205708

karl at denninger.net changed:

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                 CC|                            |karl at denninger.net

--- Comment #6 from karl at denninger.net ---
Are you running the patch from here?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594

If not are you willing to try the latest version of that patch (from
2015-12-10)?

I have had a somewhat-related crash going on for quite a while, and while it is
difficult to reproduce I've had it happen both with earlier versions of the
above patch and on a "clean" system.  HOWEVER, the last version has now been
running since early December -- with no panics.

My blowups were all related to snapshot manipulation during backup operations,
so this may be related.  If so then the root is likely the result of a modulo
extension that returns an unexpected delay product and causes trouble elsewhere
in the code.  The latest version of that patch prevents the extension from
occurring.

I can pull out just that couple of lines of code that appear to have been
effective in stopping the blowups if you'd like to try something simpler and
leave the rest of the ZFS code alone.

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