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

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 12 Apr 2022 22:57:43 UTC

--- Comment #21 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Krautmaster from comment #20)
Did this most recent crash happen with the patch from comment 5 applied?

(In reply to Krautmaster from comment #19)
You could simply run "dumpon /dev/<dump device name>" to configure it once. 
Use "dumpon -l" to verify that it reports the right device.  Also you shouldn't
configure a pool on the disk, just pass the raw disk device to dumpon.  If
you're willing to give me remote access, please mail me.

Finally, I think your kernel does not have debugging assertions enabled.  If it
is possible to get a stock kernel build with "options INVARIANTS" enabled,
please try testing it.

The fault address should correspond to the buffer returned by
aesni_cipher_alloc().  I'd guess that it's returned by
crypto_contiguous_subsegment() and there's some kind of overflow condition
occurring with the page array offset or length, but I can't see where.  There
is some fishy code, e.g., in g_disk_advance():

                bp->bio_ma_offset += off;
                bp->bio_ma_offset %= PAGE_SIZE;

but this is only a problem for large (> 2GB) offsets, which shouldn't happen...

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