Re: Memory modified after free - Jan20 -CURRENT

From: Garance A Drosihn <drosih_at_rpi.edu>
Date: Thu, 20 Jan 2005 14:46:24 -0500
At 12:29 PM -0700 1/20/05, Scott Long wrote:
>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 _at_ 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.

Ugh.  I see this too, immediately at bootup.  The system can't even
make it into single-user mode.  Right now I can't get a dump of it,
since doadump() complaints that it doesn't know my dump device.  How
do I set the dump-device from the boot-loader?  Will a dump of this
be of any help to someone, or does the panic happen too late to have
any useful information?

-- 
Garance Alistair Drosehn            =   gad_at_gilead.netel.rpi.edu
Senior Systems Programmer           or  gad_at_freebsd.org
Rensselaer Polytechnic Institute    or  drosih_at_rpi.edu
Received on Thu Jan 20 2005 - 18:46:28 UTC

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