Memory modified after free - Jan20 -CURRENT

[Scott Long]

Ketrien I. Saihr-Kenchedra wrote:

> Screen transcription attached. In a nutshell;
> 
> fdc0: <floppy drive controller> port 0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0
> device_attach: fdc0 returned 6
> sio0: <16550A-compatible COM port> port0x3f8-0x3ff irq 4 flags 0x10 on 
> acpi0
> sio0: type 16550A
> Memory modified after free 0xc1cde200(252) val=0 @ 0xc1cde228
> panic: Most recently used by none
> 
> System was fine with Jan16 srcs, fdc returning 6 is new. Looks like a uma
> problem to me, but odd enough that I'm honestly not sure. Need ips(4) for
> dumpdev, so no dump again. (Argh.)
> 

I'm seeing this quite often too.  I'm hoping that Bosko will make his
memguard changes available soon as I'm sure it could quickly be tracked
down with them.

Scott