New mac crashed - please help

[Gold Man]

I just bought a used 2020 27" imac 3.1 with catalina. When it arrived it was crashing and restarting about twice a day. I bought some new memory (8x4) and installed it. The crash/restarts seemed to stop for 48 hours but then I just got another one. It is such a pain to have to return it but can someone look at the crash report and let me know if there is anything indicating if it is a hardware problem or not? If not a hardware problem I really don't want to deal with the hassle of a return. Thanks so much - here is the crash report.

panic(cpu 1 caller 0xfffffff024ebb4c4): macOS watchdog detected
Debugger message: panic
Memory ID: 0x6
OS release type: User
OS version: 18P4346
macOS version: 19H512
Kernel version: Darwin Kernel Version 20.3.0: Tue Jan 5 18:50:06 PST 2021; root:xnu-7195.80.35~4/RELEASE_ARM64_T8010
Kernel UUID: 8FA2D31D-1BF0-3625-9EBC-76A13C76E519
iBoot version: iBoot-6723.80.19
secure boot?: YES
x86 EFI Boot State: 0xe
x86 System State: 0x0
x86 Power State: 0x0
x86 Shutdown Cause: 0x0
x86 Previous Power Transitions: 0x20002000200
PCIeUp link state: 0x94721614
Paniclog version: 13
Kernel slide: 0x000000001cfe8000
Kernel text base: 0xfffffff023fec000
mach_absolute_time: 0x1276b8ee5d7
Epoch Time: sec usec
Boot : 0x60204d77 0x000d6c9d
Sleep : 0x6022d1da 0x000bc534
Wake : 0x6022ddcc 0x000b3988
Calendar: 0x6022e9e1 0x000a6615

Panicked task 0xffffffe19b80eaa8: 2835 pages, 184 threads: pid 0: kernel_task
Panicked thread: 0xffffffe19b833168, backtrace: 0xffffffe80cb43710, tid: 375
lr: 0xfffffff0246b4494 fp: 0xffffffe80cb43750
lr: 0xfffffff0246b42f0 fp: 0xffffffe80cb437c0
lr: 0xfffffff0247dad7c fp: 0xffffffe80cb43890
lr: 0xfffffff024cc95fc fp: 0xffffffe80cb438a0
lr: 0xfffffff0246b4024 fp: 0xffffffe80cb43c20
lr: 0xfffffff0246b4024 fp: 0xffffffe80cb43c80
lr: 0xfffffff0255aab34 fp: 0xffffffe80cb43ca0
lr: 0xfffffff024ebb4c4 fp: 0xffffffe80cb43cd0
lr: 0xfffffff024ea9ab8 fp: 0xffffffe80cb43d30
lr: 0xfffffff024eab9f8 fp: 0xffffffe80cb43dc0
lr: 0xfffffff024ea9160 fp: 0xffffffe80cb43e50
lr: 0xfffffff024d99250 fp: 0xffffffe80cb43e80
lr: 0xfffffff024c25bc0 fp: 0xffffffe80cb43ec0
lr: 0xfffffff024c25440 fp: 0xffffffe80cb43f00
lr: 0xfffffff024cd45

 

[Longkeg]

While you’re waiting for someone to sift through that data maybe you could do a clean installation of a new OS:

How to reinstall macOS - Apple Support

You can use macOS Recovery, your computer's built-in recovery system, to reinstall the Mac operating system. Reinstalling macOS doesn't remove your personal data.

support.apple.com

if it is software that should fix it.

 

[James_C]

I would also take out the additional memory as that may well be the cause. Run it for a couple of days with the memory it came with to see if that is the source of the problem.

 

[Realityck]

Check you memory booting from a thumb drive with Memtest86. Memory issues as such are rare, but this really is a useful piece of software when you have unusual problems. I just used the free version.

This way you're not removing memory needlessly instead of testing that you just bought.

 

[iluvmacs99]

I just bought a used 2020 27" imac 3.1 with catalina. When it arrived it was crashing and restarting about twice a day. I bought some new memory (8x4) and installed it. The crash/restarts seemed to stop for 48 hours but then I just got another one. It is such a pain to have to return it but can someone look at the crash report and let me know if there is anything indicating if it is a hardware problem or not? If not a hardware problem I really don't want to deal with the hassle of a return. Thanks so much - here is the crash report.

panic(cpu 1 caller 0xfffffff024ebb4c4): macOS watchdog detected
Debugger message: panic
Memory ID: 0x6
OS release type: User
OS version: 18P4346
macOS version: 19H512
Kernel version: Darwin Kernel Version 20.3.0: Tue Jan 5 18:50:06 PST 2021; root:xnu-7195.80.35~4/RELEASE_ARM64_T8010
Kernel UUID: 8FA2D31D-1BF0-3625-9EBC-76A13C76E519
iBoot version: iBoot-6723.80.19
secure boot?: YES
x86 EFI Boot State: 0xe
x86 System State: 0x0
x86 Power State: 0x0
x86 Shutdown Cause: 0x0
x86 Previous Power Transitions: 0x20002000200
PCIeUp link state: 0x94721614
Paniclog version: 13
Kernel slide: 0x000000001cfe8000
Kernel text base: 0xfffffff023fec000
mach_absolute_time: 0x1276b8ee5d7
Epoch Time: sec usec
Boot : 0x60204d77 0x000d6c9d
Sleep : 0x6022d1da 0x000bc534
Wake : 0x6022ddcc 0x000b3988
Calendar: 0x6022e9e1 0x000a6615

Panicked task 0xffffffe19b80eaa8: 2835 pages, 184 threads: pid 0: kernel_task
Panicked thread: 0xffffffe19b833168, backtrace: 0xffffffe80cb43710, tid: 375
lr: 0xfffffff0246b4494 fp: 0xffffffe80cb43750
lr: 0xfffffff0246b42f0 fp: 0xffffffe80cb437c0
lr: 0xfffffff0247dad7c fp: 0xffffffe80cb43890
lr: 0xfffffff024cc95fc fp: 0xffffffe80cb438a0
lr: 0xfffffff0246b4024 fp: 0xffffffe80cb43c20
lr: 0xfffffff0246b4024 fp: 0xffffffe80cb43c80
lr: 0xfffffff0255aab34 fp: 0xffffffe80cb43ca0
lr: 0xfffffff024ebb4c4 fp: 0xffffffe80cb43cd0
lr: 0xfffffff024ea9ab8 fp: 0xffffffe80cb43d30
lr: 0xfffffff024eab9f8 fp: 0xffffffe80cb43dc0
lr: 0xfffffff024ea9160 fp: 0xffffffe80cb43e50
lr: 0xfffffff024d99250 fp: 0xffffffe80cb43e80
lr: 0xfffffff024c25bc0 fp: 0xffffffe80cb43ec0
lr: 0xfffffff024c25440 fp: 0xffffffe80cb43f00
lr: 0xfffffff024cd45

Looks to me like you may have a hardware problem with your CPU which caused the kernel panic. Your best bet is to bring your Mac which you had bought used and have them resolve it or bring it to the Apple store if you still have warranty on the unit bought as a refurbished unit.

Technical Note TN2063: Understanding and Debugging Kernel Panics

TN2063: Addresses kernel panics: what they are and how to debug the code that caused the panic.

developer.apple.com

 

[Gold Man]

Thanks so much! If it looks to be a cpu issue then returning it is my best bet despite the inconvenience. I really appreciate the help and advice! Thanks to everyone who replied - very much appreciate the assistance!