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Date:      Mon, 18 Apr 2022 23:07:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 262894] Kernel Panic (page fault) with 13.1-BETA2 in g_eli & httpd
Message-ID:  <bug-262894-227-eekacPfpTA@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-262894-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-262894-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D262894

--- Comment #31 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Alexander Motin from comment #30)
> The case of "addr & PAGE_MASK is 2048 and len is 4096" can fit into this =
only if it is the only chunk in ABD, but then it should be a linear buffer,=
 not requiring unmapped I/O.

The problem exists whenever len is a multiple of the page size, so I don't =
see
why it should always be a linear buffer.  But indeed, I'd expect I/O to a
device with ashift=3D12 to always be page aligned.

> But still, just in case, what would you say about this patch:

Looks right to me, thanks.

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