[macconvert765]

HELP! Leopard keeps crashing on me and I have no idea why. Individual apps are not crashing, the whole OS just stops and cues me to power cycle. This seems to have something to do with printing pdfs or large docs, but I'm not sure. Below is the error message:
Tue Dec 4 19:00:38 2007
panic(cpu 1 caller 0x0039CD77): "mfree: freeing an already freed mbuf"@/SourceCache/xnu/xnu-1228.0.2/bsd/kern/uipcmbuf.c:2742
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x34523838 : 0x12b0e1 (0x455670 0x3452386c 0x133238 0x0)
0x34523888 : 0x39cd77 (0x48e03c 0x1 0x3432501c 0xffff8863)
0x345238c8 : 0x39d073 (0x30200d00 0x8 0x34523918 0x1)
0x345238e8 : 0x9fcb87 (0x30200d00 0x0 0x20 0x0)
0x34523a58 : 0x9fcec5 (0x23bde2c8 0x23be0150 0x34523ac8 0x1991a6)
0x34523ba8 : 0xa06fe9 (0x23d0f004 0x0 0x34523c18 0x1991a6)
0x34523c08 : 0xa0ab0a (0x23bde4c0 0x34523dcc 0x34523c68 0x5)
0x34523de8 : 0xa0bfb1 (0x23bde2c8 0xc0bb04 0xea60 0x0)
0x34523f18 : 0x41d149 (0x23bde000 0x4389480 0x1 0x19ccc1)
0x34523f68 : 0x41c2a6 (0x4389480 0x3dad6b0 0x34523f98 0x1368db)
0x34523f98 : 0x41bf88 (0x429a2c0 0x429a2c0 0x5894 0x3dad6b0)
0x34523fc8 : 0x19e2ec (0x429a2c0 0x0 0x8 0x246)
Backtrace terminated-invalid frame pointer 0
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AirPort.Atheros(300.22)@0x9d7000->0xa61fff
dependency: com.apple.iokit.IO80211Family(200.7)@0x8d1000
dependency: com.apple.iokit.IOPCIFamily(2.4)@0x6ab000
dependency: com.apple.iokit.IONetworkingFamily(1.6.0)@0x6bb000
BSD process name corresponding to current thread: kerneltask

Mac OS version:
9B18

Kernel version:
Darwin Kernel Version 9.1.0: Wed Oct 31 17:46:22 PDT 2007; root:xnu-1228.0.2~1/RELEASEI386
System model name: MacBook1,1 (Mac-F4208CC8)
Can someone decipher this?
Other important info (perhaps) is that I recently uninstalled Intego software that won't run in 10.5. I use 3rd party ram (2 gigs) but have never had any problems with it until now. I connected a brand new Iomega hard drive shortly before this started. And someone sent me a .doc infected with a macros virus which i did NOT open.

[wgood]

While I don't speak Machine Language, I can suggest using a memory tester for your RAM. I found this because it is free. It might return something. When you say "power cycle", could you be referring to a Kernel Panic? This is a black screen with white type that prompts you to restart in 5 languages. I'll keep thinking, but usually this sort of thing is due to a 3rd party application.

[macconvert765]

Definitely Kernal Panic. Just happened again when I tried to view the printer/fax page of my system preferences. Also of note, I print to a networked printer.
I'm going to try updating the driver for this printer via a direct USB link.

[wgood]

I found this article on the apple support site that can help you narrow down an issue, maybe it will help you.
Another suggestion: create a second user, and see if the problem persists with that account. If it doesn't, the problem might be tied to a third party application or a preference in the first user account.

[macconvert765]

I connected my macbook directly to my network printer via USB and then reset all printer/driver settings. This seems to have solved the problem.
Thanks for your help.