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Mac OS 10.15.4: Random restarts due to panic(cpu 1 caller

My MacBook is restarting randomly from last few days with following error messages:


  1. "BAD MAGIC! (flag set in iBoot panic header)" (freezes, need to restart manually, 5-6 times a day)
  2. panic(cpu 1 caller 0xfffffff00df677b4): x86 CPU CATERR detected (automatic restart)
  3. panic(cpu 0 caller 0xfffffff025f05f64): "void AppleEmbeddedPCIeUpLinkMgmt: (automatic restart)


In all three cases, only safari was open with background services (Creative Cloud and OneDrive only). Nothing installed recently.


Can someone please explain the reason for these panics, logs are as follows:


Case 2:

panic(cpu 1 caller 0xfffffff00df677b4): x86 CPU CATERR detected

Debugger message: panic

Memory ID: 0xff

OS version: 17P4263

macOS version: 19E266

Kernel version: Darwin Kernel Version 19.4.0: Mon Mar  2 20:38:56 PST 2020; root:xnu-6153.101.6~2/RELEASE_ARM64_T8010

Kernel UUID: 3695E9D9-323E-350E-9A6E-65819BE397D7

iBoot version: iBoot-5540.105.2

secure boot?: YES


x86 EFI Boot State: 0x16

x86 System State: 0x0

x86 Power State: 0x0

x86 Shutdown Cause: 0x7

x86 Previous Power Transitions: 0x10001000100

PCIeUp link state: 0x89473614


Paniclog version: 13

Kernel slide:     0x0000000005f30000

Kernel text base: 0xfffffff00cf34000

mach_absolute_time: 0x63d86ef5e6


Epoch Time:        sec       usec

  Boot    : 0x5e7aa096 0x000606d7

  Sleep   : 0x5e7ab184 0x000525ba

  Wake    : 0x5e7ab672 0x000d3056

  Calendar: 0x5e7af45a 0x000baf4f


Panicked task 0xffffffe0000c8200: 3144 pages, 214 threads: pid 0: kernel_task

Panicked thread: 0xffffffe000380fd8, backtrace: 0xffffffe0154e34b0, tid: 323

  lr: 0xfffffff00d7f8764  fp: 0xffffffe0154e34f0

  lr: 0xfffffff00d7f85c0  fp: 0xffffffe0154e3560

  lr: 0xfffffff00d912e7c  fp: 0xffffffe0154e3610

  lr: 0xfffffff00ddc162c  fp: 0xffffffe0154e3620

  lr: 0xfffffff00d7f7f28  fp: 0xffffffe0154e3990

  lr: 0xfffffff00d7f8280  fp: 0xffffffe0154e39e0

  lr: 0xfffffff00e62e934  fp: 0xffffffe0154e3a00

  lr: 0xfffffff00df677b4  fp: 0xffffffe0154e3a30

  lr: 0xfffffff00df58be4  fp: 0xffffffe0154e3aa0

  lr: 0xfffffff00df5ab0c  fp: 0xffffffe0154e3b50

  lr: 0xfffffff00df5831c  fp: 0xffffffe0154e3be0

  lr: 0xfffffff00df1f780  fp: 0xffffffe0154e3c10

  lr: 0xfffffff00dd2eabc  fp: 0xffffffe0154e3c50

  lr: 0xfffffff00dd2e340  fp: 0xffffffe0154e3c90

  lr: 0xfffffff00ddcc514  fp: 0x0000000000000000


Case 3:

panic(cpu 0 caller 0xfffffff025f05f64): "void AppleEmbeddedPCIeUpLinkMgmt::_linkInterruptAction(IOInterruptEventSource *, int): " "A link timeout has been seen after 650000 microseconds and 49999 iterations."@/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleEmbeddedPCIeUpLinkMgmt/AppleEmbeddedPCIeUpLinkMgmt-102.100.1/AppleEmbeddedPCIeUpLinkMgmt.cpp:3986


Debugger message: panic

Memory ID: 0xff

OS version: 17P4263

macOS version: 19E266

Kernel version: Darwin Kernel Version 19.4.0: Mon Mar  2 20:38:56 PST 2020; root:xnu-6153.101.6~2/RELEASE_ARM64_T8010

Kernel UUID: 3695E9D9-323E-350E-9A6E-65819BE397D7

iBoot version: iBoot-5540.105.2

secure boot?: YES


x86 EFI Boot State: 0x16

x86 System State: 0x0

x86 Power State: 0x0

x86 Shutdown Cause: 0xc1

x86 Previous Power Transitions: 0x10001000100


PCIeUp link state: 0x89473611

Paniclog version: 13

Kernel slide:     0x000000001debc000

Kernel text base: 0xfffffff024ec0000

mach_absolute_time: 0x935988e94


Epoch Time:        sec       usec

  Boot    : 0x5e7af472 0x000636b9

  Sleep   : 0x5e7ba195 0x000e2a08

  Wake    : 0x5e7bbb14 0x0005f8d1

  Calendar: 0x5e7bbc86 0x000ab712


Panicked task 0xffffffe00053fc00: 3131 pages, 214 threads: pid 0: kernel_task

Panicked thread: 0xffffffe00093d520, backtrace: 0xffffffe0157335b0, tid: 275

  lr: 0xfffffff025784764  fp: 0xffffffe0157335f0

  lr: 0xfffffff0257845c0  fp: 0xffffffe015733660

  lr: 0xfffffff02589ee7c  fp: 0xffffffe015733710

  lr: 0xfffffff025d4d62c  fp: 0xffffffe015733720

  lr: 0xfffffff025783f28  fp: 0xffffffe015733a90

  lr: 0xfffffff025784280  fp: 0xffffffe015733ae0

  lr: 0xfffffff0265ba8f8  fp: 0xffffffe015733b00

  lr: 0xfffffff025f05f64  fp: 0xffffffe015733b30

  lr: 0xfffffff025f00ed0  fp: 0xffffffe015733bc0

  lr: 0xfffffff025cbbd88  fp: 0xffffffe015733c10

  lr: 0xfffffff025cbaabc  fp: 0xffffffe015733c50

  lr: 0xfffffff025cba340  fp: 0xffffffe015733c90

  lr: 0xfffffff025d58514  fp: 0x0000000000000000

MacBook Pro 13”, macOS 10.15

Posted on Mar 25, 2020 1:34 PM

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211 replies

Apr 24, 2020 7:35 AM in response to BinnX1

I use my ipad pro as an external display. When it works as a wireless external display, all things are fine. But if the ipad connect with the Macbook via a usb-c cable, and works as a wired external display, randomly restarts and freezes comes. Sry for my bad English, hope you can read it.


MBP 16'' 2019 i9 16GB 1TB 5500M

iPad Pro 12.9" 2018 256GB WiFi

Apr 24, 2020 10:49 AM in response to CaptainTeemoOnDuty

My view is to wait for an OS fix; This all started after 10.15.4 update and things just seemingly are random but for me it is always a kernel panic in the bridgeaudiod always the same where there is no watchdog checkin.

It is useless to bring it in for repair or try things with setting x or y. All you can do is wait. Just every time submit your crash report so the frequency is known and so raises the criticality. Other than that nothing you can do and wait for a fix. I have a brand new MacBook pro 2019 16" and after the 10.15.4 it is a total disaster with kernel panics. It is clearly an OS problem.

Apr 28, 2020 8:04 AM in response to BinnX1

Similar issue as stated with the "panic(cpu 1 caller 0xfffffff01c4577b4): x86 CPU CATERR detected" error.

Brand new MacBook Pro 16" with 16 gigs of memory, just pulled it out of the box a week ago. The first day I had it reboot 4 times or so. 2 times during a zoom call with family. All went well for a last 5 days or so then it appears to have rebooted last night when inactive, same error.

Really hoping it is a software issue that can be corrected with an update.


Apr 28, 2020 9:22 AM in response to gac_nogales

It is an OS issue so no need to reinstall, no need to reset SMC, no need to change power settings. For me the only way to reduce panics now is to reduce audio usage and don't use FaceTime for now (all my panics are caused by bridgeaudiod ). If I use FaceTime during the day I know in about 45 minutes I have a panic. When I don't use audio at all then I can run all day and no issues.

May 9, 2020 1:51 AM in response to Paveway

Lucky you! I can no longer send reports, it freezes!


For me it all started after I upgraded to 10.15.4 and when I ran out of battery while working on Photoshop (unplugged)

I realised I had 1% left of battery only and ran to get my charger and to plug my mac, which took a bit of time.

I was happily surprised as it didn't shut down (while Photoshop usually drains the battery so fast).

The charging icon showed up and I resumed working thinking everything was ok.

30 seconds later, the mac turned off (while it was charging or supposed to).

It woke up to say it didn't shut down properly and would send a report.


Since that episode, my MBP 15 2017 keeps on restarting whenever it's in sleep mode.

The worst being that it even reboot when the screen is closed which cause an additional overheating.


Guys, It's time to publish an update with a fix!

As it was said earlier we don't buy 3-4K computer to play videogames but to work.

And each time our computer restarts, it a total waste of our time in a period where we need everything but this.

Where is the support?

May 10, 2020 6:25 PM in response to hwang15

Finally decided to just call Apple and see what they would do for me. After sending it to them for repair, they replaced the logic board and touch ID. I’m not sure if it’s completely fixed yet so I will update after a few days of using it. I do have to say though… Apple customer service was really really good this time around. I had it back after only 3 days at no cost. If you’re having this problem and can still buy AppleCare, do it before your warranty runs out!

May 11, 2020 7:24 AM in response to rpeegee

Ok, I I have deduced mine down to the following: I bought a Laci 2Big 8TB backup drive / dock from the Apple Store prior to upgrading to 10.15.4. My machine was able to remained docked via Thunderbolt 3, the Lacie 2Big all has a Displayport out for video. My CPU panic issue happens when the machine / macOS goes to sleep. There is something triggering this in 10.15.4 that was not there in 10.15.3. I left my machine plugged in all weekend, overnight and such, UNPLUGGED from the Lacie 2Big dock (Thunderbolt 3/Displayport video), and my machine is still up and running as I left it Friday 5/8. I am upset that items purchased from the Apple store cause these driver issues, I am torn between sending the Lacie 2Big dock back or waiting for Lacie AND Apple to get their sh*t together and fix the driver issues that macOS 10.15.4 is clearly having across a number of fronts from the replies here. There has been a pattern emerging with Apple, their hw and sw are no longer the gold standard of stability. Current Apple devices may very well be my last if these do not improve over their lifecycle.

Mac OS 10.15.4: Random restarts due to panic(cpu 1 caller

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