[Bug 262894] Kernel Panic (page fault) with 13.1-BETA2 in g_eli & httpd

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 262894] Kernel Panic (page fault) with 13.1-BETA2 in g_eli & httpd"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 18 Apr 2022 18:41:08 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262894

--- Comment #26 from Alexander Motin <mav@FreeBSD.org> ---
(In reply to Mark Johnston from comment #24)
ZFS on FreeBSD allocates all I/O memory through UMA, so it is always mapped. 
But just recently I made it use BIO_UNMAPPED for poor-man's scatter/gather on
page boundaries to avoid one memory copy on I/O aggregation.  So there should
indeed be a mix of virtual and physical (represented as unmapped) addressed
I/Os visible.  I've even forgot about it myself when looking on this, thinking
the unmapped I/O is generated by swapper. ;)  But indeed it can be ZFS now.

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