panic(cpu 2 caller 0xffffff8006043d9e): "a freed zone element has been modified in zone: kalloc.2048"@/SourceCache/xnu/xnu-2050.5.8/osfmk/ MT Lion 10.8

2012-11-08

Strange issue of Kernel panic when I try to logout:

Temp Solution: Turn off Energy Saver -> Automatic Graphics Switching

Likely the alternate power-saving graphics chip is bad and causing error. I did do a hardware test with no errors. It maybe a corrupted driver but at least for now I no longer get a kernel panic when I log-out.

Mon Nov 5 09:41:03 2012

panic(cpu 2 caller 0xffffff8006043d9e): "a freed zone element has been modified in zone: kalloc.2048"@/SourceCache/xnu/xnu-2050.5.8/osfmk/kern/zalloc.c:219

Backtrace (CPU 2), Frame : Return Address

0xffffff80f6873250 : 0xffffff800601d636

0xffffff80f68732c0 : 0xffffff8006043d9e

0xffffff80f6873300 : 0xffffff80060435e2

0xffffff80f68733e0 : 0xffffff80060245fd

0xffffff80f6873410 : 0xffffff800635cbc0

0xffffff80f6873440 : 0xffffff80063adce3

0xffffff80f68736a0 : 0xffffff80063ac8d0

0xffffff80f68737a0 : 0xffffff800635499d

0xffffff80f6873c50 : 0xffffff800635756b

0xffffff80f6873e90 : 0xffffff8006357b53

0xffffff80f6873f20 : 0xffffff8006357a20

0xffffff80f6873f50 : 0xffffff80063e362a

0xffffff80f6873fb0 : 0xffffff80060ce813

BSD process name corresponding to current thread: loginwindow

Boot args: arch=x86_64

Mac OS version:

12A206j

Kernel version:

Darwin Kernel Version 12.0.0: Tue May 8 17:30:17 PDT 2012; root:xnu-2050.5.8~1/RELEASE_X86_64

Kernel UUID: E520B189-2D5A-3123-BD71-BE142E468536

Kernel slide: 0x0000000005e00000

Kernel text base: 0xffffff8006000000

System model name: MacBookPro6,1 (Mac-F22589C8)

System uptime in nanoseconds: 1069248003835

last loaded kext at 419427272788: com.apple.filesystems.smbfs1.8 (addr 0xffffff7f88693000, size 229376)

last unloaded kext at 178449205735: com.apple.driver.AppleUSBUHCI