thanks devin for the great tip. yeah, now i got core dumps...:) but where is my "gdb" under that "debug.kdb.available"?
best /gahn ----- Original Message ----- From: Devin Teske <devin.te...@fisglobal.com> To: 'gahn' <ipfr...@yahoo.com>; 'freebsd general questions' <freebsd-questions@freebsd.org> Cc: Sent: Friday, April 6, 2012 2:13 PM Subject: RE: learning freebsd kernel > -----Original Message----- > From: owner-freebsd-questi...@freebsd.org [mailto:owner-freebsd- > questi...@freebsd.org] On Behalf Of gahn > Sent: Friday, April 06, 2012 11:05 AM > To: freebsd general questions > Subject: learning freebsd kernel > > hi gurus: > > how could i create the core dumps on freebsd kernel? i am trying to create a > kernel core dump on 8.1 but it didn't happen: > > # sysctl -w debug.kdb.panic=1 > > well the system went panic, entered the mode db>. i did "reboot' but there was > no core/kernel dumps under /var/crash. > Did you set the "dumpdev" directive in /etc/rc.conf? % grep dumpdev /etc/defaults/rc.conf dumpdev="NO" # Device name to crashdump to (or NO). savecore_flags="" # Used if dumpdev is enabled above, and present. You should set the value of dumpdev to your swap device. You can get this value by executing the following: awk '$3~/swap/{print $1}' /etc/fstab Should produce something like "/dev/mfid0s1b" or "da0s1b" or "ada0s1b" or "ad0s1b" etc. depending on your RELEASE and hardware. If the output is, for example, "/dev/mfid0s1b", you should add the following to /etc/rc.conf: dumpdev="/dev/mfid0s1b" -- Devin > the customized kernel has those information enabled: > > # Debugging for use in -current > options KDB # Enable kernel debugger support. > options DDB # Support DDB. > options GDB # Support remote GDB. > > user@host:~:$ sysctl -a | grep debug.kdb > debug.kdb.stop_cpus: 1 > debug.kdb.trap_code: 0 > debug.kdb.trap: 0 > debug.kdb.panic: 0 > debug.kdb.enter: 0 > debug.kdb.current: ddb > debug.kdb.available: ddb > > > > by the way, where is my gdb? on one of my company's machisne, it looks like > this: > > debug.kdb.available: ddb gdb > > thank you all > > /gahn > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org" _____________ The information contained in this message is proprietary and/or confidential. If you are not the intended recipient, please: (i) delete the message and all copies; (ii) do not disclose, distribute or use the message in any manner; and (iii) notify the sender immediately. In addition, please be aware that any message addressed to our domain is subject to archiving and review by persons other than the intended recipient. Thank you. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
