[Bug 243225] "mpr0: Out of chain frames" boot hang after clang 9.0.1 import (probably timing, not compiler related)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243225

Warner Losh <imp at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |imp at FreeBSD.org

--- Comment #4 from Warner Losh <imp at FreeBSD.org> ---
Looking at the source we see:

mpr_dprint(sc, MPR_INFO, "Out of chain frames, "
    "consider increasing hw.mpr.max_chains.\n");

Have you increased hw.mpr.max_chains?

We use this sort of controller all the time (though we don't use tape drive) at
work and haven't seen this at all.

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