Panic - Watchdog Timeout: no checkins from watchdogd in 185 seconds

I should report that the 10.15.6 supplemental update has resolved the kernel panic issue for me. 100%

Same here! All good since I installed the 10.15.6 supplemental update.

10.15.6. Supplemental seems to have resolved my Kernel Panic Issue.

if you are still struggling with this issue, I suggest updating your Mac to this version.

I had a warning from ESET AntiVirus instalation some time ago that I had ClamXav installed, and I did not know about such program and could not find it. But I was inspired by peter_watt and did one more special search. I found a folder inside /usr/local/ named ClamXav and deleted it. Someone knows anything about a relation between ClamXav and kernel panics?

All of my information is backed up in iCloud. I just removed Norton from my MBP, hopefully that is what is causing my problem. I notice that it pops up after I get the Watchdog Timeout. If it continues I will take it into the Apple store. Thank you for the update.

As I said on page 1, remove all security and cleaner apps.

It is step one of any Mac diagnostics and then leave them off permanently .

Even if it is not the cause if this problem they have no place on any Apple product.

Get Etrecheck from App Store

Give the tool full disk access

Run a report

Create a •new thread• and attach the report using the Additional Text icon

Nobody who is an expert will help you on a thread this age.

Decided to try caffeinate and I have been successfully running for 5 hours with no freezing or reboots.

Mine was crashing every night for about 3 weeks.

After the combo update was installed it stopped and has not crashed since. So my experience is that the combo update did resolve the issue.

It is a good way of installing incremental updates for any Mac that may have had a corrupt update process. It cannot do any harm and it may do good along with an occasional Safe Boot and resetting SMC and NVRAM

If the problem is incompatible apps or hardware it will probably not help.

Also remove all antivirus and cleaner apps.

If it was me I would revert to Mojave from the last TM backup in Mojave

rosbif78 wrote:

I have a permanently connected USB hard drive for regular Time Machine backups. I also use an external screen.

Are there any tests that I could perform to help you, either before or after installing the COMBO update?

At this point in time I'm just trying to see if I can collect information that will point to a common cause.

But so far I have user environments all over the map, and nothing seems to be common.

I have system with no external devices, and no 3rd party kernel extensions. Those are the most baffling.

So I'm wondering if WatchDog timeout is a side effect of some other kernel change where the right kind of system load, causes the code responsible to telling the WatchDog timer to reset is not getting around to do the reset in a timely manor.

But it does not seem to be any specific identifiable subsystem. At first I was thinking USB bus, but when I started asking around, I found users with no external devices. Just the power cord.

However, a different use that ONLY have the watchdog timeout when using a specific USB device.

I wondered about IPv6, and I've asked some users if they would change System Preferences -> Network -> Select network interface in the left column -> Advanced -> Configure IPv6 -> "Link-local only" (that is change it away from "Automatic", and see if that helps. The theory being that everyone has a different home router, with different levels of firmware patching, and it is possible that the Catalina IPv6 stack does not like the response from a specific IPv6 implementation it has found on a home router.

And then there is the theory that 3rd party Bluetooth devices having a variety of different Bluetooth chips, with different qualities of Bluetooth implementations, which is yet another networking standard, and if I'm going to wonder about IPv6, it is only fair to wonder about Bluetooth (or at least non-Apple devices, as I'm sure Apple has been using Apple Bluetooth devices all over the place in-house).

But at the moment I have theories (LOUSY Theories), but nothing I can hang my hat on.

I'm as frustrated as the uses getting the watchdog timeouts.

I understand that everybody has different problems with the kernel panic situation. In my case it started to occur after I installed 10.15.6 and it only happened when I was away from my iMac 2017 for a while. Upon return, the iMac had restarted. I never had any resets or freezes happening "live".

For that reason, I have now tried to disable power nap and it looks like this has solved the problem for me. In addition, I already had disabled HDD sleep mode previously as otherwise Catalina would always dismount my external drives.

Get rid of Webroot and any third party cleaner tools then come back and start your own new discussion thread. This thread is stale and none of the experts will come here now.

https://www.apple.com/uk/macos/security/

Incremental updates often patch the existing OS. They can be corrupted even with verification.

The Combo is a full copy of the current OS and is preferred by many experienced users

Thanks Peter. Downloaded/re-installed Big Sur 11.1. No issues since then but might be a coincidence?