How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Isaac Franklin Your Own Question
Isaac Franklin
Isaac Franklin, Computer Hardware Engineer
Category: Mac
Satisfied Customers: 940
Experience:  Technical Support Coach at Liberty Tax Service
93584285
Type Your Mac Question Here...
Isaac Franklin is online now
A new question is answered every 9 seconds

I have been having random shut downs on my Mac Pro 1.1

Customer Question

I have been having random shut downs on my Mac Pro 1.1 running El Capitan.
JA: How much experience do you have with this particular machine?
Customer: This is the error I see upon restart
JA: What troubleshooting have you tried?
Customer: Anonymous UUID: 82698567-188D-5EF1-F4F1-2F0AF16BE13DThu Jul 28 11:34:48 2016*** Panic Report ***
panic(cpu 0 caller 0xffffff80177e78a7): slab_nextptr_panic: mcache.bigcl buffer 0xffffff811be6d000 in slab 0xffffff80e9b1e2a8 modified after free at offset 0: 0xe5e5e5e5e5e5e5e5 out of range [0xffffff811b15f000-0xffffff812115f000)Backtrace (CPU 0), Frame : Return Address
0xffffff912348b620 : 0xffffff80172dab52
0xffffff912348b6a0 : 0xffffff80177e78a7
0xffffff912348b700 : 0xffffff80177e6f4a
0xffffff912348b740 : 0xffffff80177e2fb2
0xffffff912348b7d0 : 0xffffff80177e40a1
0xffffff912348b890 : 0xffffff80177c23a6
0xffffff912348b940 : 0xffffff80177e363a
0xffffff912348b9f0 : 0xffffff80177c23a6
0xffffff912348baa0 : 0xffffff80177df1c8
0xffffff912348bb50 : 0xffffff80177bf4b4
0xffffff912348bb80 : 0xffffff7f980f8bde
0xffffff912348bbd0 : 0xffffff7f980f8f48
0xffffff912348bc40 : 0xffffff7f9870e805
0xffffff912348bec0 : 0xffffff7f9870e225
0xffffff912348bef0 : 0xffffff80178b5146
0xffffff912348bf40 : 0xffffff80178b2fb1
0xffffff912348bf80 : 0xffffff80178b30a6
0xffffff912348bfb0 : 0xffffff80173c9117
Kernel Extensions in backtrace:
com.apple.iokit.IONetworkingFamily(3.2)[848B398F-4D96-3024-8092-6CD3534D2CCA]@0xffffff7f980f1000->0xffffff7f9811dfff
com.apple.driver.AppleIntel8254XEthernet(3.1.4b1)[F74DD10C-690C-3B74-98F5-F50E093A1E68]@0xffffff7f98709000->0xffffff7f98719fff
dependency: com.apple.iokit.IONetworkingFamily(3.2)[848B398F-4D96-3024-8092-6CD3534D2CCA]@0xffffff7f980f1000
dependency: com.apple.iokit.IOPCIFamily(2.9)[F51AA3D6-EC2F-3AD3-A043-06DB79027AA2]@0xffffff7f97bf4000BSD process name corresponding to current thread: kernel_task
JA: The Mac expert can solve this for you. Anything else you want him to know before I connect you two?
Customer: I feel I have a good knowledge and experience with Macs and Mac Os after 30 years
Submitted: 1 year ago.
Category: Mac
Expert:  Isaac Franklin replied 1 year ago.

Hello. My name is***** to JustAnswer. I'm reviewing your question now, and will post back with your reply momentarily.

Is your Mac connected by ethernet or wirelessly?

did you try a pram reset and start in safemode yet?

Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
Turn on your Mac.
Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
Hold these keys until the computer restarts and you hear the startup sound for a second time.
Release the keys.

Then let it try to restart. If it doesnt, shut down the mac after that, turn on, hold down left shift key

for a good 20 seconds to get it to boot in safe mode.

Let me know what happens. We will go from there.

If you are satisfied with the help I have provided, please remember to click and submit a star rating on this page. Your feedback is important as it is the only way I am credited for assisting you. Thank you.
~Franklin

Customer: replied 1 year ago.
The Mac automatically restarts after each shutdown. I am connected via ethernet.
Customer: replied 1 year ago.
this is the entire system report after the last crashAnonymous UUID: 82698567-188D-5EF1-F4F1-2F0AF16BE13DThu Jul 28 11:34:48 2016*** Panic Report ***
panic(cpu 0 caller 0xffffff80177e78a7): slab_nextptr_panic: mcache.bigcl buffer 0xffffff811be6d000 in slab 0xffffff80e9b1e2a8 modified after free at offset 0: 0xe5e5e5e5e5e5e5e5 out of range [0xffffff811b15f000-0xffffff812115f000)Backtrace (CPU 0), Frame : Return Address
0xffffff912348b620 : 0xffffff80172dab52
0xffffff912348b6a0 : 0xffffff80177e78a7
0xffffff912348b700 : 0xffffff80177e6f4a
0xffffff912348b740 : 0xffffff80177e2fb2
0xffffff912348b7d0 : 0xffffff80177e40a1
0xffffff912348b890 : 0xffffff80177c23a6
0xffffff912348b940 : 0xffffff80177e363a
0xffffff912348b9f0 : 0xffffff80177c23a6
0xffffff912348baa0 : 0xffffff80177df1c8
0xffffff912348bb50 : 0xffffff80177bf4b4
0xffffff912348bb80 : 0xffffff7f980f8bde
0xffffff912348bbd0 : 0xffffff7f980f8f48
0xffffff912348bc40 : 0xffffff7f9870e805
0xffffff912348bec0 : 0xffffff7f9870e225
0xffffff912348bef0 : 0xffffff80178b5146
0xffffff912348bf40 : 0xffffff80178b2fb1
0xffffff912348bf80 : 0xffffff80178b30a6
0xffffff912348bfb0 : 0xffffff80173c9117
Kernel Extensions in backtrace:
com.apple.iokit.IONetworkingFamily(3.2)[848B398F-4D96-3024-8092-6CD3534D2CCA]@0xffffff7f980f1000->0xffffff7f9811dfff
com.apple.driver.AppleIntel8254XEthernet(3.1.4b1)[F74DD10C-690C-3B74-98F5-F50E093A1E68]@0xffffff7f98709000->0xffffff7f98719fff
dependency: com.apple.iokit.IONetworkingFamily(3.2)[848B398F-4D96-3024-8092-6CD3534D2CCA]@0xffffff7f980f1000
dependency: com.apple.iokit.IOPCIFamily(2.9)[F51AA3D6-EC2F-3AD3-A043-06DB79027AA2]@0xffffff7f97bf4000BSD process name corresponding to current thread: kernel_taskMac OS version:
15G31Kernel version:
Darwin Kernel Version 15.6.0: Thu Jun 23 18:25:34 PDT 2016; root:xnu-3248.60.10~1/RELEASE_X86_64
Kernel UUID: B5AA8E3E-65B6-3D0E-867B-8DCCF81E536C
Kernel slide: 0x0000000017000000
Kernel text base: 0xffffff8017200000
__HIB text base: 0xffffff8017100000
System model name: MacPro1,1 (Mac-F42C88C8)System uptime in nanoseconds: 16700778761784
last loaded kext at 12859457831548: com.apple.driver.AppleXsanScheme 3 (addr 0xffffff7f9a3ca000, size 32768)
last unloaded kext at 12922407459801: com.apple.driver.AppleXsanScheme 3 (addr 0xffffff7f9a3ca000, size 32768)
loaded kexts:
com.tuxera.filesystems.tufsfs.fusefs_txantfs 2015.11.5
com.sonnettech.SonnetSATABlockStorage 2.2.9
com.sonnettech.driver.SonnetSATA 2.2.9
com.Cycling74.driver.Soundflower 2
fi.dungeon.driver.SATSMARTDriver 0.10
com.apple.filesystems.smbfs 3.0.1
com.apple.driver.AppleBluetoothMultitouch 90.3
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.driver.AppleMCCSControl 1.2.13
com.apple.kext.AMDFramebuffer 1.4.2
com.apple.iokit.CSRBluetoothHostControllerUSBTransport 4.4.6f1
com.apple.driver.AppleHDA 274.12
com.apple.AMDRadeonX3000 1.4.2
com.apple.kext.AMD5000Controller 1.4.2
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AppleLPC 3.1
com.apple.driver.pmtelemetry 1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.iokit.IOBluetoothSerialManager 4.4.6f1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHV 1
com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
com.apple.iokit.SCSITaskUserClient 3.7.7
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.BootCache 38
com.apple.iokit.IOAHCIBlockStorage 2.8.5
com.apple.driver.usb.AppleUSBOHCIPCI 1.0.1
com.apple.driver.AppleFWOHCI 5.5.4
com.apple.driver.AirPortBrcm43224 700.36.24
com.apple.driver.AppleIntelPIIXATA 2.5.1
com.apple.driver.AppleAHCIPort 3.1.8
com.apple.driver.AppleIntel8254XEthernet 3.1.4b1
com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1
com.apple.driver.usb.AppleUSBUHCIPCI 1.0.1
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleACPIButtons 4.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 4.0
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0
com.apple.nke.applicationfirewall 163
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.AppleIntelCPUPowerManagement 218.0.0
com.apple.driver.IOBluetoothHIDDriver 4.4.6f1
com.apple.driver.AppleMultitouchDriver 304.12
com.apple.driver.AppleHIDTransport 5
com.apple.kext.triggers 1.0
com.apple.driver.AppleSMBusController 1.0.14d1
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.6f1
com.apple.driver.DspFuncLib 274.12
com.apple.kext.OSvKernDSPLib 525
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOAcceleratorFamily2 205.11
com.apple.kext.AMDSupport 1.4.2
com.apple.AppleGraphicsDeviceControl 3.12.8
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.AppleHDAController 274.12
com.apple.iokit.IOHDAFamily 274.12
com.apple.driver.IOPlatfor
Expert:  Isaac Franklin replied 1 year ago.

Unplug the ethernet cord and retry the pram reset/safe mode.

do not plug ethernet cord back in until after you have done the reset/restart safe mode.

(if you look at crash report, there are ethernet crash reports)

Kernel Extensions in backtrace:
com.apple.iokit.IONetworkingFamily(3.2)[848B398F-4D96-3024-8092-6CD3534D2CCA]@0xffffff7f980f1000->0xffffff7f9811dfff
com.apple.driver.AppleIntel8254XEthernet(3.1.4b1)[F74DD10C-690C-3B74-98F5-F50E093A1E68]@0xffffff7f98709000->0xffffff7f98719fff

Customer: replied 1 year ago.
I won't be able to do a reset pram or perhaps even a safe boot. My corded Apple KB is dead after liquid was spilled on it. Only working KB is Logitech USB Wireless. I know the option key on startup does not work.As I recall there are a couple of buttons on the Mac Pro 1.1 logic board. Perhaps that will do the same thing.I am heading for lunch and will try what I can later.
Expert:  Isaac Franklin replied 1 year ago.

Okay, let me know what happens after you remove the ethernet cord and try to start it up again.

Tell me if it crashes and we will go from there.

Customer: replied 1 year ago.
The wireless KB is not active until the OS loads. I did a shudown, unplugged the ethernet cable. Now using only WiFi. I suppose for now it is best to see if another shut down occurs while on WiFi. Shutdowns do seem to happen when clicking a new browser link. Perhaps a clean install would be in order to help eliminate a hardware issue.How long can we keep this case open?
Expert:  Isaac Franklin replied 1 year ago.

You can keep it open as long as the 'technical support' pertains to this question.

What we were looking for is no wifi or ethernet cord. It was to test if the mac ran better/didnt shut down.

Let me know if it shuts down again with it connected to wifi and not connected to wifi. it will help us narrow

down the issue. You could have something as easy as a bad ethernet cord or port.

Related Mac Questions