Re: hammer-inodes: malloc limit exceeded

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

:I've got a new panic.
:
:How can I be sure to get a crash dump ? This machine actually panicked
:once again before but for some reason didn't dump the core.
:
:It is sitting at the kernel debugger screen for the moment.
:
:-- 
:Francois Tigeot

    It has to be setup before-hand.  If it isn't there isn't much you can
    do from the debugger.  If it is setup before hand you can type 'panic'
    from the debugger prompt & hit return twice (usually) and it will dump
    before rebooting.

    Generally speaking you set up to get a crash dump like this:

    * Have enough swap space to cover main memory.  i.e. if you 4g of
      ram, you need 4g of swap.

    * Set dumpdev to point to the swap device in /etc/rc.conf.  Example:
      'dumpdev=/dev/ad6s1b'.  Takes effect when you reboot, you can
      manually set the dumpdev on the running system by also running
      'dumpon /dev/ad6s1b').

    * Add 'kern.sync_on_panic=0' to your /etc/sysctl.conf to tell the
      system not to try to flush the buffer crash when it crashes.  This
      improves its chances of being able to get to the dump code.

    You can set the kernel up to automatically reboot on a panic (and
    generate a crash dump if it has been setup to do one) by compiling
    the kernel with:

	options	    DDB
	options	    DDB_TRACE
	options     DDB_UNATTENDED

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>