iMac 2012 error kernel panic? RAM problem? GPU? :(

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Dong-gyun Author

Level 1

9 points

iMac 2012 error kernel panic? RAM problem? GPU? :(

I've got a iMac 2012 21.5'. I upgraded Ram from 8gb to 16gm and replaced fusion drive to SSD.

After I upgraded those parts and also upgraded from High Sierra to Mojave.

And some problems occur.

when I use web browser (both Chrome and Safari), it just reloads several time itself and sometimes, shut down the web browser itself.
When I watching video through youtube or Netflix, frequently reboot(turning off and turning on) it self. with an message 'Some problems occur, so it rebooted'
When I do some complex work with it (word, pages, web browser, coding work at the same time) then it reboot itself again same sign as No.2.

I did hardware test and have error message : 4MEM/9/40000000: 0x7eb5e990

and from the panic report I found several panic message:

*** Panic Report ***

panic(cpu 0 caller 0xffffff802c4bcf07): "pmap_page_protect() " "pmap=0xffffff8052ec0190 pn=0x17259e vaddr=0x115060000\n"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-4903.241.1/osfmk/i386/pmap_x86_common.c:1648

Backtrace (CPU 0), Frame : Return Address

0xffffff9233c93250 : 0xffffff802c3aeb0d

0xffffff9233c932a0 : 0xffffff802c4e8653

0xffffff9233c932e0 : 0xffffff802c4da07a

0xffffff9233c93350 : 0xffffff802c35bca0

0xffffff9233c93370 : 0xffffff802c3ae527

0xffffff9233c93490 : 0xffffff802c3ae373

0xffffff9233c93500 : 0xffffff802c4bcf07

0xffffff9233c935b0 : 0xffffff802c4313c7

0xffffff9233c935f0 : 0xffffff802c4322c3

0xffffff9233c939a0 : 0xffffff802c4315c4

0xffffff9233c93a10 : 0xffffff802c9037c8

0xffffff9233c93a70 : 0xffffff802c5f753a

0xffffff9233c93af0 : 0xffffff802c5f6d96

0xffffff9233c93b30 : 0xffffff802c5fb5c0

0xffffff9233c93bb0 : 0xffffff802c606d15

0xffffff9233c93c50 : 0xffffff802c5fca93

0xffffff9233c93c80 : 0xffffff802c5f6349

0xffffff9233c93cf0 : 0xffffff802c5fc8ab

0xffffff9233c93d30 : 0xffffff802c8ce0d6

0xffffff9233c93df0 : 0xffffff802c8e6c7c

0xffffff9233c93f40 : 0xffffff802c9b62bb

0xffffff9233c93fa0 : 0xffffff802c35c466

BSD process name corresponding to current thread: launchd

Mac OS version:

18D42

Kernel version:

Darwin Kernel Version 18.2.0: Thu Dec 20 20:46:53 PST 2018; root:xnu-4903.241.1~1/RELEASE_X86_64

Kernel UUID: 1970B070-E53F-3178-83F3-1B95FA340695

Kernel slide: 0x000000002c000000

Kernel text base: 0xffffff802c200000

__HIB text base: 0xffffff802c100000

System model name: iMac13,1 (Mac-00BE6ED71E35EB86)

System uptime in nanoseconds: 12141382185622

last loaded kext at 5094622357874: com.apple.driver.usb.cdc.acm 5.0.0 (addr 0xffffff7fafc13000, size 32768)

last unloaded kext at 10886007364155: com.apple.driver.usb.cdc 5.0.0 (addr 0xffffff7fafbe9000, size 28672)

loaded kexts:

com.apple.driver.AudioAUUC 1.70

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.fileutil 18.306.12

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleMikeyHIDDriver 131

com.apple.driver.AppleUpstreamUserClient 3.6.5

com.apple.GeForce 12.0.0

com.apple.driver.AppleIntelHD4000Graphics 12.0.4

com.apple.driver.AppleThunderboltIP 3.1.2

com.apple.driver.AppleMikeyDriver 282.10

com.apple.driver.AGPM 110.23.46

com.apple.driver.ApplePlatformEnabler 2.7.0d0

com.apple.driver.X86PlatformShim 1.0.0

com.apple.driver.AirPort.Brcm4360 1400.1.1

....

----------------------------------------------------------------------------------------------------------

*** Panic Report ***

panic(cpu 0 caller 0xffffff8000cda29d): Kernel trap at 0xffffff8000cba435, type 14=page fault, registers:

CR0: 0x0000000080010033, CR2: 0xffffff8839ec5fc0, CR3: 0x0000000175f0d148, CR4: 0x00000000001626e0

RAX: 0xffffff8839ec5fc0, RBX: 0xffffff8839ec5fc0, RCX: 0x0000000000000000, RDX: 0xffffff8024e22e60

RSP: 0xffffff81eaa63ab0, RBP: 0xffffff81eaa63bc0, RSI: 0x00000000563af16d, RDI: 0x0000000000000000

R8: 0x00000000563af16d, R9: 0x0000000000000000, R10: 0x0000000000000000, R11: 0x00007fff957e6000

R12: 0x00000000000000ff, R13: 0xffffff8026c52da0, R14: 0xffffffff957e6000, R15: 0xfffffe883761ef30

RFL: 0x0000000000010286, RIP: 0xffffff8000cba435, CS: 0x0000000000000008, SS: 0x0000000000000000

Fault CR2: 0xffffff8839ec5fc0, Error code: 0x0000000000000000, Fault CPU: 0x0, PL: 3, VF: 5

Backtrace (CPU 0), Frame : Return Address

0xffffff81eaa63580 : 0xffffff8000baeb0d

0xffffff81eaa635d0 : 0xffffff8000ce8653

0xffffff81eaa63610 : 0xffffff8000cda07a

0xffffff81eaa63680 : 0xffffff8000b5bca0

0xffffff81eaa636a0 : 0xffffff8000bae527

0xffffff81eaa637c0 : 0xffffff8000bae373

0xffffff81eaa63830 : 0xffffff8000cda29d

0xffffff81eaa639a0 : 0xffffff8000b5bca0

0xffffff81eaa639c0 : 0xffffff8000cba435

0xffffff81eaa63bc0 : 0xffffff8000c38151

0xffffff81eaa63d30 : 0xffffff8000c39f88

0xffffff81eaa63f10 : 0xffffff8000cda675

0xffffff81eaa63fa0 : 0xffffff8000b5bbaf

BSD process name corresponding to current thread: Google Chrome He

---------------------------------------------------------------------------------------------------

what should I do?

I suspect some disposition of Ram based on the hardware test error message.

iMac 21.5", 10.14

Posted on Feb 8, 2019 5:28 AM

Reply

Answer 1

Top-ranking reply

den.thed

Level 10

92,626 points

Feb 8, 2019 6:30 AM in response to Dong-gyun

PC and Mac spec's are different.

Personally I would order the correct RAM for your 2012 iMac from either Crucial or OWC.

https://www.crucial.com/usa/en/memory-mac-apple?cm_re=us-flyout-memory-_-us-memory-mac-systems

https://eshop.macsales.com/shop/memory/iMac/2012_21.5/DDR3L

Reply

Answer 2

John Galt

Level 10

156,518 points

Feb 8, 2019 5:36 AM in response to Dong-gyun

I did hardware test and have error message : 4MEM/9/40000000: 0x7eb5e990

Replace that iMac's memory. Obtain it from a vendor known to support Macs, since PC-centric vendors often sell memory that does not meet Apple's stringent requirements.

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Answer 3

John Galt

Level 10

156,518 points

Feb 8, 2019 6:04 AM in response to Dong-gyun

Yes.

That error:

4MEM/9/40000000: 0x7eb5e990

... means the memory has failed.

All the symptoms you describe are also consistent with memory that has failed.

If you did not obtain the upgraded memory from a vendor known to support Macs, then return it for a full cash refund and obtain replacement memory from a vendor known to support Macs.

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Answer 4

Dong-gyun Author

Level 1

9 points

Feb 8, 2019 6:32 AM in response to den.thed

well. ok. First I will try to re-seat the Ram and order a new one. thanks

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Answer 5

Dong-gyun Author

Level 1

9 points

Feb 8, 2019 6:14 AM in response to den.thed

which special information do you need?

what I can check is both ram is 8 GB DDRE 1600MHz

or you meaning that there is an very specific Ram suitable for iMAC only?

I plan to exchange with Crucial 8GB DDR3L-1600 SODIMM

Is this Ram suitable for iMac 2012? Actually it's from the dell latitude e7450 laptop...

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Answer 6

Dong-gyun Author

Level 1

9 points

Feb 8, 2019 5:41 AM in response to John Galt

Do you mean is this because of the bad memory? But the Ram is replaced with the professionals who handle apple product

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Answer 7

Dong-gyun Author

Level 1

9 points

Feb 8, 2019 6:15 AM in response to John Galt

Oh... then is there any possibility that this problem occurs due to mis-position of Ram on slot?

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Answer 8

John Galt

Level 10

156,518 points

Feb 8, 2019 6:24 AM in response to Dong-gyun

Yes, that is possible. Remove and re-seat it, and repeat Apple Hardware Test. If it indicates the same RAM failure then I would not waste any more time with it.

I plan to exchange with Crucial 8GB DDR3L-1600 SODIMM

Those specifications are correct and Crucial is a good vendor. However, just be advised that a PC such as Dell Latitude can adjust its memory bus speed to cope with RAM that is not working as fast as it should. A Mac has no ability to do that, which means that memory must absolutely, positively meet its published specifications.

Crucial will sell aftermarket Mac memory in packaging bearing a Mac logo, even if the part number is exactly the same. They also charge more for it. That seems to imply Crucial actually tests the memory they sell to Mac customers to verify specification compliance, but Crucial does not divulge that information.

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