--- Comment #4 from Aleksander Alekseev <> ---
I'm sorry but I'm having some problems getting a backtrace.

There are:


... lines in /etc/rc.conf

I can't enter debugger using sysctl:

$ sudo sysctl debug.kdb.enter=1
debug.kdb.enter: 0 -> 0

Ctr+Alt+Escape hotkey doesn't work either.

I can crash a kernel using:

sudo sysctl debug.kdb.panic=1

... command but after reboot there is no dump in /var/crash directory.

I tried to reboot without loading i915kms.ko in case it causes these problems.
But without this driver screen doesn't turn on after suspend/resume so even if
I enter a debugger I can't read a backtrace.

In dmesg -a I see:

No suitable dump device was found.
/etc/rc: WARNING: failed precmd routine for ddb

Full `dmesg -a` after crash and reboot:

I have a single disk partition, no swap:

# Device        Mountpoint      FStype  Options Dump    Pass#
/dev/ada0p2     /               ufs     rw      1       1

`savecore -v` tells me `savecore: no dumps found`.

uname -a:

FreeBSD e733 11.0-RC2 FreeBSD 11.0-RC2 #0 r304729: Wed Aug 24 06:59:03 UTC 2016  amd64

Any advice?

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