Kernel Panic 2019 i9 iMac Vega 48

rstsauveur

macrumors newbie
Original poster
Oct 23, 2018
10
3
So I have a 27" iMac i9 Vega 48 1TB ssd (Catalina) that is 10 days old. It has crashed several times while doing nothing much at all. Occasionally I will also see some screen garbage that requires a restart. I added 32 GB OWC RAM to the 8GB, placed new RAM in the free slots. Is this a Catalina issue? Vega 48? RAM?

Thanks!
 

Zdigital2015

macrumors 68020
Jul 14, 2015
2,116
2,254
East Coast, United States
Take the DRAM out and see if the issues go away...if they do, you have your answer. Or take out the Apple DRAM, put the OWC DRAM in their place, rinse, lather, repeat...
 
Last edited:

mmomega

macrumors 68040
Dec 30, 2009
3,411
1,577
DFW, TX
More issues than not with iMacs and kernel panics are from 3rd party RAM.
Since the 27" models were introduced I own 8 different years. And if I get a kernel panic, the first thing I do is a hardware test, more times than not the test will discover an issue with the RAM.
If it doesn't discover a fault and I still get the panics, I will temporarily put the original RAM back in and use the machine normally to continue testing.

Would almost bet money right now without knowing anything else it is RAM.
 
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Reactions: Zdigital2015

Zdigital2015

macrumors 68020
Jul 14, 2015
2,116
2,254
East Coast, United States
More issues than not with iMacs and kernel panics are from 3rd party RAM.
Since the 27" models were introduced I own 8 different years. And if I get a kernel panic, the first thing I do is a hardware test, more times than not the test will discover an issue with the RAM.
If it doesn't discover a fault and I still get the panics, I will temporarily put the original RAM back in and use the machine normally to continue testing.

Would almost bet money right now without knowing anything else it is RAM.
Concurring with @mmomega ...I have a 27” 2010 Core i7 iMac that has always been persnickety about DRAM and while it will take 32GB and has it, it has always behaved better with 16 or 24GB inside, despite having DRAM that is properly specced for the iMac. The same with my 27” Late 2013 iMac in that I bought DRAM that was specced and matched according to the RAM manufacturer and yet would eventually KP all over the place...it stopped once I went to another Mfr and chose their compatible DRAM, but every so often I got a KP and I would wonder. Coincidentally, KPs on the Late 2013 ramped up with High Sierra running NVIDIA Web Drivers and the CUDA driver and then went completely disappeared when I uninstalled those drivers and moved to Mojave. However, I did experience those KPs prior under El Crapitan and Sierra. I have Crucial DRAM (2x16GB) in my 2019 Core i9/Vega 48 iMac and I haven’t had any issues with it over the last 5 months.

Alternatively, leasing computers with Apple BTO DRAM has NEVER, EVER caused me any issues. Of course, you pay through the nose with it, but I digress.

I bet it’s the DRAM...
 

rstsauveur

macrumors newbie
Original poster
Oct 23, 2018
10
3
So I have found that the iMac runs stable with all 40 GB of RAM if I pull the Akitio Thunder 2 Quad Mini. I have it attached via Apples TB3-TB2 adapter. Is this a coincidence? Is this a Vega 48 issue? Details on the Akitio here.

 

rstsauveur

macrumors newbie
Original poster
Oct 23, 2018
10
3
Here is the EtreCheck report

EtreCheck version: 6.1.9 (6B057)

Report generated: 2020-02-03 19:34:11

Download EtreCheck from https://etrecheck.com

Runtime: 1:26

Performance: Excellent


Problem:
Computer is restarting


Major Issues:
Anything that appears on this list needs immediate attention.


No Time Machine backup - Time Machine backup not found.

Kernel panics - This system has experienced kernel panics. This could be a sign of hardware failure.


Minor Issues:
These issues do not need immediate attention but they may indicate future problems or opportunities for improvement.


Heavy I/O usage - Your system is under heavy I/O use. This will reduce your performance.

32-bit Apps - This machine has 32-bits apps will not work on macOS 10.15 “Catalina”.

Limited drive access - More information may be available with Full Drive Access.


Hardware Information:
iMac (Retina 5K, 27-inch, 2019)
iMac Model: iMac19,1
1 3.6 GHz 8-Core Intel Core i9 (i9-9900K) CPU: 8-core
32 GB RAM - Upgradeable by an Apple Authorized Service Provider
BANK 0/ChannelA-DIMM0 - 16 GB DDR4 2667
BANK 1/ChannelA-DIMM1 - Empty
BANK 2/ChannelB-DIMM0 - 16 GB DDR4 2667
BANK 3/ChannelB-DIMM1 - Empty

Video Information:
Radeon Pro Vega 48 - VRAM: 8 GB
iMac (built-in) 5120 x 2880

Drives:
disk0 - APPLE SSD SM1024L 1.00 TB (Solid State - TRIM: Yes)
Internal PCI-Express 8.0 GT/s x4 NVM Express
disk0s1 - EFI [EFI] 315 MB
disk0s2 [APFS Container] 1.00 TB
disk1 [APFS Virtual drive] 1.00 TB (Shared by 5 volumes)
disk1s1 - Macintosh HD (APFS) (Shared - 10.97 GB used)
disk1s2 - M************ Data (APFS) [APFS Virtual drive] (Shared - 130.35 GB used)
disk1s3 - Preboot (APFS) [APFS Preboot] (Shared - 88 MB used)
disk1s4 - Recovery (APFS) [Recovery] (Shared - 527 MB used)
disk1s5 - VM (APFS) [APFS VM] (Shared - 2.15 GB used)
disk2 - WD My Book 1230 3.00 TB
External USB 5 Gbit/s USB
disk2s1 - EFI [EFI] 315 MB
disk2s2 - R****U (Journaled HFS+) 3.00 TB (1.27 TB used)
disk3 - Samsung SSD 850 EVO 250GB 250.06 GB (Solid State - TRIM: No)
External Thunderbolt 6 Gigabit Serial ATA
disk3s1 - EFI (MS-DOS FAT32) [EFI] 210 MB
disk3s2 - SSD (Journaled HFS+) 249.20 GB (4.32 GB used)
disk3s3 - Recovery HD (Journaled HFS+) [Recovery] 650 MB
disk4 - KINGSTON SV300S37A120G 120.03 GB (Solid State - TRIM: No)
External Thunderbolt 6 Gigabit Serial ATA
disk4s1 - EFI (MS-DOS FAT32) [EFI] 210 MB
disk4s2 - S*******D (Journaled HFS+) 119.69 GB (223 MB used)
disk5 - CT1000MX500SSD1 1.00 TB (Solid State - TRIM: No)
External Thunderbolt 6 Gigabit Serial ATA
disk5s1 - EFI (MS-DOS FAT32) [EFI] 210 MB
disk5s2 - S*****h (Journaled HFS+) 999.86 GB (20.00 GB used)
disk6 - CT1000MX500SSD1 1.00 TB (Solid State - TRIM: No)
External Thunderbolt 6 Gigabit Serial ATA
disk6s1 - EFI (MS-DOS FAT32) [EFI] 210 MB
disk6s2 - V***o (Journaled HFS+) 999.86 GB (582.69 GB used)

Mounted Volumes:
disk1s1 - Macintosh HD
1.00 TB (Shared - 10.97 GB used, 857.05 GB available, 855.94 GB free)
APFS
Mount point: /
Read-only: Yes
disk1s2 - M************ Data [APFS Virtual drive]
1.00 TB (Shared - 130.35 GB used, 857.05 GB available, 855.94 GB free)
APFS
Mount point: /System/Volumes/Data
disk1s5 - VM [APFS VM]
1.00 TB (Shared - 2.15 GB used, 855.94 GB free)
APFS
Mount point: /private/var/vm
disk2s2 - R****U
3.00 TB (1.27 TB used, 1.73 TB free)
Journaled HFS+
Mount point: /Volumes/R****U
Owners enabled: No
disk3s2 - SSD
249.20 GB (4.32 GB used, 244.92 GB available, 244.88 GB free)
Journaled HFS+
Mount point: /Volumes/SSD
Owners enabled: No
disk4s2 - S*******D
119.69 GB (223 MB used, 119.51 GB available, 119.47 GB free)
Journaled HFS+
Mount point: /Volumes/S*******D
Owners enabled: No
disk5s2 - S*****h
999.86 GB (20.00 GB used, 979.90 GB available, 979.86 GB free)
Journaled HFS+
Mount point: /Volumes/S*****h
Owners enabled: No
disk6s2 - V***o
999.86 GB (582.69 GB used, 417.21 GB available, 417.17 GB free)
Journaled HFS+
Mount point: /Volumes/V***o
Owners enabled: No

Network:
Interface en0: Ethernet
Interface en1: Wi-Fi

Interface en5: iPhone
Interface en6: iPad
Interface en4: Bluetooth PAN
Interface bridge0: Thunderbolt Bridge
iCloud Quota: 123.20 GB available

System Software:
macOS Catalina 10.15.3 (19D76)
Time since boot: Less than an hour

Notifications:

EtreCheckPro.app

one notification


Security:
Gatekeeper: App Store and identified developers

System Integrity Protection: Enabled


Antivirus software: Apple


32-bit Applications:
One 32-bit app

System Launch Agents:
[Not Loaded] 16 Apple tasks

[Loaded] 174 Apple tasks

[Running] 121 Apple tasks


System Launch Daemons:
[Not Loaded] 35 Apple tasks

[Loaded] 183 Apple tasks

[Running] 117 Apple tasks

[Other] One Apple task


Launch Agents:
[Running] com.adobe.AdobeCreativeCloud.plist (Adobe Systems, Inc. - installed 2020-01-10)

[Running] com.adobe.GC.AGM.plist (Adobe Systems, Inc. - installed 2020-01-10)

[Not Loaded] com.adobe.GC.Invoker-1.0.plist (Adobe Systems, Inc. - installed 2020-01-10)


Launch Daemons:
[Running] com.adobe.acc.installer.v2.plist (Adobe Systems, Inc. - installed 2020-01-10)

[Running] com.adobe.agsservice.plist (Adobe Systems, Inc. - installed 2020-01-10)


User Launch Agents:
[Loaded] com.adobe.GC.Invoker-1.0.plist (Adobe Systems, Inc. - installed 2020-01-10)

[Loaded] com.adobe.ccxprocess.plist (Apple - installed 2020-01-23)


User Login Items:
[Not Loaded] CompressorHelper (App Store - installed 2020-01-10)
Modern Login Item
/Applications/Compressor.app/Contents/Library/LoginItems/CompressorHelper.app
[Running] Magnet (App Store - installed 2020-01-10)
Application
/Applications/Magnet.app

Internet Plug-ins:
AdobeAAMDetect: 3.0.0.0 (Adobe Systems, Inc. - installed 2020-01-10)

Time Machine:
Time Machine Not Configured!

Performance:

System Load: 3.10 (1 min ago) 1.50 (5 min ago) 0.78 (15 min ago)
Nominal I/O speed: 21.45 MB/s
File system: 10.62 seconds
Write speed: 1982 MB/s
Read speed: 2965 MB/s

CPU Usage Snapshot:
Type Overall

System 0 %

User 1 %

Idle 99 %


Top Processes Snapshot by CPU:
Process (count) CPU (Source - Location)

EtreCheckPro 14.26 % (Etresoft, Inc.)

WindowServer 5.48 % (Apple)

kernel_task 1.56 % (Apple)

logd 0.34 % (Apple)

cfprefsd (3) 0.14 % (Apple)


Top Processes Snapshot by Memory:
Process (count) RAM usage (Source - Location)

EtreCheckPro 1.13 GB (Etresoft, Inc.)

mdworker_shared (30) 1.00 GB (Apple)

Adobe Desktop Service 689 MB (Adobe Systems, Inc.)

MTLCompilerService (8) 476 MB (Apple)

Adobe CEF Helper (2) 311 MB (Adobe Systems, Inc.)


Top Processes Snapshot by Network Use:
Process Input / Output (Source - Location)

mDNSResponder 69 KB / 52 KB (Apple)

apsd 20 KB / 38 KB (Apple)

cloudd 5 KB / 2 KB (Apple)

com.apple.Safari.SafeBrowsing.Service 6 KB / 1 KB (Apple)

rapportd 2 KB / 758 B (Apple)


Top Processes Snapshot by Energy Use:
Process (count) Energy (0-100) (Source - Location)

WindowServer 3 (Apple)

Core Sync 0 (Adobe Systems, Inc.)

secinitd (3) 0 (Apple)

Adobe Desktop Service 0 (Adobe Systems, Inc.)

launchd 0 (Apple)


Virtual Memory Information:
Physical RAM: 32 GB


Free RAM: 15.94 GB

Used RAM: 9.33 GB

Cached files: 6.73 GB


Available RAM: 22.67 GB

Swap Used: 0 B


Software Installs (past 30 days):
Install Date Name (Version)

2020-01-10 Gatekeeper Configuration Data (181)

2020-01-10 iStat Mini (1.1)

2020-01-10 Magnet (2.4.5)

2020-01-10 Disk Speed Test (3.2)

2020-01-11 Keynote (9.0)

2020-01-11 Pages (8.0)

2020-01-11 Numbers (6.0)

2020-01-12 AdwareCleaner (1.2)

2020-01-12 Cinebench (20.060)

2020-01-19 Geekbench 5 (5.0.2)

2020-01-22 XProtectPlistConfigData (2112)

2020-02-01 MRTConfigData (1.53)


Diagnostics Information (past 7-30 days):
2020-02-03 17:47:21 photoanalysisd - High CPU Use
Executable: /System/Library/PrivateFrameworks/PhotoAnalysis.framework/Versions/A/Support/photoanalysisd
2020-02-03 17:37:32 Kernel Panic (5 times)
Details:
panic(cpu 2 caller 0xffffff80042d8aea): slab_nextptr_panic: mcache.big
cl buffer 0xffffff83be5bb000 in slab 0xffffff80550769c0 modified after
free at offset 0: 0x55000000 out of range [0xffffff83be387000-0xfffff
f83c6387000)

2020-02-03 07:04:28 media-indexer - High CPU Use (2 times)
Executable: /System/Library/PrivateFrameworks/AssistantServices.framework/Versions/A/XPCServices/media-indexer.xpc/Contents/MacOS/media-indexer
2020-02-02 20:07:34 signpost_reporter - High CPU Use
Executable: /usr/libexec/signpost_reporter

End of report