/var/crash is empty after crash

[kenorb]

After kernel crash

> ll /var/crash
total 2
-rw-r--r--  1 root  wheel  5 Jul 19 03:17 minfree

is empty.
I've DDB and DEBUG=-g enabled.
How to enable it?

See:
http://www.gsp.com/cgi-bin/man.cgi?section=4&topic=gdb

 

[SirDice]

See crash(8) and dumpon(8).

 

[kenorb]

See crash(8) and dumpon(8).

Doesn't really help me.
Any command to run or file to change?

> sudo dumpon -v /dev/ad10s1a
dumpon: ioctl(DIOCSKERNELDUMP): Operation not supported by device
> sudo savecore
savecore: no dumps found

 

[SirDice]

You really should read better:

Calls to dumpon normally occur from the system multi-user initialization file /etc/rc, controlled by the ``dumpdev'' variable in the boot time configuration file /etc/rc.conf.

 

[kenorb]

Thank you.
Added:

dumpdev="AUTO"

into my rc.conf

 

[eye]

> sudo dumpon -v /dev/ad10s1a
dumpon: ioctl(DIOCSKERNELDUMP): Operation not supported by device

Do you have a filesystem on that device? Not sure if DIOCSKERNELDUMP is allowed on any partition labeled other than swap, e.g. by a sanity check to prevent doadump() thrashing filesystem with data.

 

[kenorb]

Do you have a filesystem on that device? Not sure if DIOCSKERNELDUMP is allowed on any partition labeled other than swap, e.g. by a sanity check to prevent doadump() thrashing filesystem with data.

Yes, it works for swap, thanks.

> sudo dumpon -v /dev/ad10s1b
kernel dumps on /dev/ad10s1b

 

[richardpl]

There are some cases when dump can not be saved ...

 

[DutchDaemon]

This topic is better suited for the FreeBSD developer mailing lists.