Mac Kernel Panick Fix

Well, I got the gray screen of death on the mac.

To solve I mucked around until I got the fix:

For Panic:

Tue Aug 5 22:08:01 2008
panic(cpu 1 caller 0x001694C6): "vm_map_unwire: entry is unwired"@/SourceCache/xnu/xnu-1228.5.20/osfmk/vm/vm_map.c:4110
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x2e5ebdf8 : 0x12b0fa (0x4592a4 0x2e5ebe2c 0x133243 0x0)
0x2e5ebe48 : 0x1694c6 (0x45c20c 0x36dcc000 0x0 0x2e5ebf0c)
0x2e5ebf28 : 0x61c328 (0x36ddc000 0x0 0x0 0x0)
0x2e5ebfc8 : 0x19ebdc (0x0 0x0 0x1a20b5 0x3d45c80)
Backtrace terminated-invalid frame pointer 0
Kernel loadable modules in backtrace (with dependencies):
com.apple.BootCache(30)@0x61a000->0x61efff

BSD process name corresponding to current thread: kernel_task

Mac OS version:
9E17

Kernel version:
Darwin Kernel Version 9.4.0: Mon Jun 9 19:30:53 PDT 2008; root:xnu-1228.5.20~1/RELEASE_I386
System model name: MacBookAir1,1 (Mac-F42C8CC8)


For this panic the essential piece of information is the the BootCache line and so here's the fix, rather easy... once you learn it.

Enjoy your Mac Back:


Mac OS X 10.3 only: If the issue only occurs once in a while (intermittently), do this after a successful startup:

From the Finder's Go menu, choose Go to Folder.
Type the following without quotes: "/System/Library/Extensions/".
Press Return.
In the Extensions window, locate the file named BootCache.kext.
Delete the BootCache.kext file. You may be prompted for an administrator password.

The next time you start up, the startup process could take a little longer than usual as the BootCache.kext file is recreated.