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Date:      Mon, 14 Jan 2019 18:23:51 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 234444] cc_htcp + TCP_RFC7413 panic
Message-ID:  <bug-234444-7501-mGV3DiqYSI@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-234444-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-234444-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234444

--- Comment #8 from Michael Tuexen <tuexen@freebsd.org> ---
(In reply to Sergey Samoyloff from comment #6)
Here is the config I'm using when trying to reproduce it:

tuexen@stable11:~ % uname -a
FreeBSD stable11 11.2-RELEASE-p8 FreeBSD 11.2-RELEASE-p8 #0 r342950: Fri Ja=
n 11
23:37:10 CET 2019=20=20=20=20
tuexen@stable11:/usr/home/tuexen/releng/11.2/sys/amd64/compile/TCP  amd64
tuexen@stable11:~ % sysctl net.inet.tcp.cc.algorithm
net.inet.tcp.cc.algorithm: htcp
tuexen@stable11:~ % sysctl net.inet.tcp.cc.htcp
net.inet.tcp.cc.htcp.rtt_scaling: 1
net.inet.tcp.cc.htcp.adaptive_backoff: 1
tuexen@stable11:~ % sysctl net.inet.tcp.fastopen.enabled
net.inet.tcp.fastopen.enabled: 1
tuexen@stable11:~ % cat stable/11/sys/amd64/conf/TCP
include         GENERIC
ident           TCP=20=20=20=20=20

makeoptions     WITH_EXTRA_TCP_STACKS=3D1
options         TCP_RFC7413
options         IPFIREWALL
options         IPFIREWALL_VERBOSE
options         IPFIREWALL_VERBOSE_LIMIT=3D5
options         IPFIREWALL_DEFAULT_TO_ACCEPT
tuexen@stable11:~ % cat /etc/make.conf=20
MODULES_OVERRIDE=3Dtcp cc opensolaris dtrace

I have a HTTP server supporting TCP fast open running and an sshd not using=
 TCP
fast open. I can log into the machine without problems, and access the HTTP
server actually using TCP fast open.

So the problem is not just using a combination of the CC module and using T=
CP
fast open.

Just to double check: When you compiled you custom kernel with TCP fast open
enabled, you also recompiled the kernel modules you are using, right?

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