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Date:      Sun, 28 Jan 2024 14:13:05 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 276674] [panic] [htcp] sysctl net.inet.tcp.cc.algorithm=htcp produces kernel panic
Message-ID:  <bug-276674-7501-99Eimuf9NN@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-276674-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-276674-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D276674

--- Comment #3 from Vladyslav V. Prodan <admin@support.od.ua> ---
(In reply to Richard Scheffenegger from comment #2)

I added the option
sysrc savecore=3D"YES"

And unpacked the debug kernel on the target machine.
# env LANG=3Den_EN.UTF-8 ls -l /usr/lib/debug/boot/kernel/kernel.debug
-r--r--r--  1 root  wheel  122662424 Jan  9 06:11
/usr/lib/debug/boot/kernel/kernel.debug


Changed sysctl option to trigger crashdump
# sysctl net.inet.tcp.cc.algorithm=3Dhtcp
net.inet.tcp.cc.algorithm: newreno -> htcp

You need to wait 2-6 days for crashdump to appear...

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