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Date:      Wed, 24 May 2023 20:49:28 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 268400] Page fault kernel panic with KTLS enabled
Message-ID:  <bug-268400-227-3teEUlsUqT@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-268400-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-268400-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D268400

--- Comment #17 from Daniel Ponte <amigan@gmail.com> ---
I know, which is why I am somewhat stumped, here.

15:49:07.223007 IP (tos 0x0, ttl 54, id 0, offset 0, flags [DF], proto TCP =
(6),
length 40)
    71.xxx.xxx.xxx.443 > 67.yyy.yyy.yyy.13889: Flags [R], cksum 0xbbe1
(correct), seq 1468723210, win 0, length 0
15:49:13.723854 IP (tos 0x0, ttl 54, id 0, offset 0, flags [DF], proto TCP =
(6),
length 1500)
    71.xxx.xxx.xxx.443 > 67.yyy.yyy.yyy.52767: Flags [.], cksum 0x06e1
(incorrect -> 0xe541), seq 6527:7975, ack 823, win 1027, options [nop,nop,TS
val 739004335 ecr 3884435406], length 1448
15:49:29.282814 IP (tos 0x0, ttl 54, id 0, offset 0, flags [DF], proto TCP =
(6),
length 52)
    71.xxx.xxx.xxx.443 > 67.yyy.yyy.yyy.52767: Flags [R.], cksum 0x2746
(correct), seq 14417, ack 823, win 0, options [nop,nop,TS val 739019895 ecr
3884435406], length 0
15:49:29.282858 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP =
(6),
length 52)
    67.yyy.yyy.yyy.52767 > 71.xxx.xxx.xxx.443: Flags [.], cksum 0x7494
(incorrect -> 0x4bbf), seq 823, ack 6527, win 1026, options [nop,nop,TS val
3884512321 ecr 738940511], length 0
15:49:29.297044 IP (tos 0x0, ttl 54, id 0, offset 0, flags [DF], proto TCP =
(6),
length 40)
    71.xxx.xxx.xxx.443 > 67.yyy.yyy.yyy.52767: Flags [R], cksum 0xeabd
(correct), seq 190739836, win 0, length 0

The 71.xxx host is the machine that had this patch applied. I have modified=
 the
patch to wrap the mb_unmapped_to_ext and goto in a conditional for a sysctl.
KTLS appears to work again with no checksum problems, but I will also wait =
to
see whether the machine crashes, in case my sysctl is broken.

--=20
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