Debugging modify-after-free issue

[Xin LI]

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Hi,

Recently I had some crashes and other issues on my laptop and I found
that, among some bugs I already caught and fixed on my local tree, there
is still something like this:

Oct 10 01:35:53 delta kernel: Memory modified after free
0xffffff00a2ef9600(256) val=6438300 @ 0xffffff00a2ef9608


Is there any way to track this down (looks like to be wpi(4) related but
still keep trying)?  I can not seem to reliably trigger it so it would
be helpful if such thing would trigger a panic.

Cheers,
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