kernel panic

Matthew Dillon dillon at
Fri May 11 17:51:17 PDT 2007

:There is a small delay <2s.  I ran a loop that switched between two
:IPs for about 15 minutes and nothing happened.  
:The kernel buffer output in the corefile was from months ago.  I only
:remembered because I did the same thing this time; shutdown now;
:umount /home; ifconfig re0 ...  I don't know how this can be in a dump
:months after the fact unless there is stale data in my swap partition
:from my last coredump that hasn't been overwritten since I don't do
:very much swapping.  This idea may be completely wrong.  I am 100%
:certain that I'm not looking at a stale dump as strings on the kernel
:and vmcore show them as being from May 9, 2007.  I am also certain
:that I was not ifconfig'ing any interface when this happened.

    Sometimes the BIOS clears memory, sometimes it doesn't.  If it doesn't,
    then sometimes the dmesg text from previous boots will remain in
    memory and be available.  That's all.  Power cycle and it all goes poof.

    I've googled similar bug reports on FreeBSD, Linux, NetBSD, etc.  I
    have not found much information other then this:

    Which seems to indicate that it might be DRM/DRI related.. or perhaps
    just video/DRI related as this person triggered it simply by restarting
    his X server a few times.

    BUT, our flush code already uses the changes made to FreeBSD, i.e.
    uses ~(1 << 7), so I am somewhat at a loss.

					Matthew Dillon 
					<dillon at>

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