Q: Kernel panic upgrading from 10.8.5 to El Capitan

Hello, I’ve been trying to update my wife’s Mac Pro from Mountain Lion 10.8.5 up to El Capitan. The upgrade process seems to go fine but on re-start I get a freeze and a sting of panic code on screen. I have absolutely no idea what this means so I’m hoping someone out there might be able to understand it.

Mac Pro

Early 2009

2.66 Quad Core

13GB RAM

I know it’s quite an early model, but it’s on the list as being upgradable.

Apologies for any mistakes in the code. All I could do was shoot it with my phone for reference and type it out from there:

panic(cpu 2 caller 8xffffff8812fb11fa): ”TLB invalidation IPI  timeout ” ”CPU(s) failed to respond to interrupts, unresponsive CPU bitmap CPU bitmap: 8x1, NMIPI acks: orig: 0x0, now: 0X0”@/Library/Cashes/com.apple.xbs/Sources/xnu/xnu-3248.30.4

Debugger called: <panic>

Backtrace (CPU 2), Frame : Return Adress

0xffffff91a9e338c0 : 0xffffff8012edf792

0xffffff91a9e33940 : 0xffffff8012fb11fa

0xffffff91a9e339e0 : 0xffffff8012fb1b07

0xffffff91a9e33a70 : 0xffffff80112f59b49

0xffffff91a9e33ad0 : 0xffffff801344a115

0xffffff91a9e33b50 : 0xffffff8013449d80

0xffffff91a9e33bc0 : 0xffffff8013449a81

0xffffff91a9e33c30 : 0xffffff8013449a81

0xffffff91a9e33ca0 : 0xffffff8013447482

0xffffff91a9e33cf0 : 0xffffff801344726e

0xffffff91a9e33d50 : 0xffffff801346200c

0xffffff91a9e33dd0 : 0xffffff8012f2a806

0xffffff91a9e33e30 : 0xffffff8012ee3ef3

0xffffff91a9e33e60 : 0xffffff8012ec78a8

0xffffff91a9e33ea0 : 0xffffff8012ed72e5

0xffffff91a9e33f10 : 0xffffff8012fbcd2a

0xffffff91a9e33fb0 : 0xffffff8012ff0a56

BSD process name corresponding to current thread: kextd

Mac OS version:

15D21

Kernel version:

Darwin Kernel Version 15.3.0: Thu Dec 10 18:40:58 PST 2015; root:Xnu-3248.30.4-1/RELEASE_X86_64

Kernel UUYD: DECC9F02-27D7-31F0-9599-A9EF2873902C

Kernel slide:     0x0000000012c00000

Kernel text base: 0xffffff8012e00000

_HY8 text base:   0xfffffrf8012d00000

System model name: MacPro4.1 (Mac-F2218EC8)

System uptime in nanoseconds: 98653262431

Machine-check capabilities: 0x0000000000001c89

family: 6 model: 26 stepping: 5 microcode: 17

signature: 0x186a5

intel(R) Xeon(R) CPU          W3520 @ 2.67GHz

9 error-reporting banks

She's now reverted to 10.8.5 from a Carbon Copy Cloner back up.

Thanks
Ed