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

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 18 Apr 2022 19:39:25 UTC

--- Comment #27 from Alexander Motin <mav@FreeBSD.org> ---
I've tested small instruction to get minidump on TrueNAS:

Before the crash:

sysctl debug.debugger_on_panic=0
sysctl debug.ddb.textdump.pending=0
dumpon off
dumpon /dev/daX

After the crash:

cd /mnt/tank
savecore . /dev/da2

As result, in the specified directory should be stored couple files
representing the dump.  They do for me.

Debug symbols for the specific TrueNAS build can be found at
http://download.freenas.org/ , looking for TrueNAS-13.0-MASTER-*.debug.txz for
the exact version running (see `cat /etc/version` on the NAS).  Inside archive
in usr/lib/debug/boot there are symbols for normal and debug kernels (depending
which one is enabled), that can be unpacked into the same path on TrueNAS root
to run kgdb on the core.

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