iMac Shutdown Problem

[Bshute]

Late 2013 iMac, OS Catalina
Can anyone tell what is going on here? I assume it is some program that isn't shutting down properly, but I have nothing open. When I try to shut down, most (but not all) times, after a long wait, I get a "Your computer was restarted because of a problem." message. After another long wait, the computer restarts and I get the following long message:
Problem Details and System Configuration

Panic(cpu 2 caller 0xffffff7f862faaae): watchdog timeout: no checkins from watchdogd in 308 seconds (4649 totalcheckins since monitoring last enabled), shutdown in progress
Backtrace (CPU 2), Frame : Return Address
0xffffff81e209bc40 : 0xffffff800571763d
0xffffff81e209bc90 : 0xffffff8005851b25
0xffffff81e209bcd0 : 0xffffff80058436ae
0xffffff81e209bd20 : 0xffffff80056bda40
0xffffff81e209bd40 : 0xffffff8005716d07
0xffffff81e209be40 : 0xffffff80057170f7
0xffffff81e209be90 : 0xffffff8005ebe898
0xffffff81e209bf00 : 0xffffff7f862faaae
0xffffff81e209bf10 : 0xffffff7f862fa486
0xffffff81e209bf50 : 0xffffff7f8634ed9c
0xffffff81e209bfa0 : 0xffffff80056bd13e
Kernel Extensions in backtrace:
com.apple.driver.watchdog(1.0)[6C98691D-0510-3A98-9B62-C8FF0B9E3C99]@0xffffff7f862f9000->0xffffff7f86301fff
com.apple.driver.AppleSMC(3.1.9)[73E3419A-8963-3BB8-8538-1FFDEE1F8583]@0xffffff7f86341000->0xffffff7f8635ffff
dependency: com.apple.iokit.IOACPIFamily(1.4)[0BC116A3-534A-3990-99CB-09DB34A5EFAA]@0xffffff7f862f0000
dependency: com.apple.driver.watchdog(1)[6C98691D-0510-3A98-9B62-C8FF0B9E3C99]@0xffffff7f862f9000
dependency: com.apple.iokit.IOPCIFamily(2.9)[B4389948-0918-363E-8E70-0FBC89B384CA]@0xffffff7f86302000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
19H1030

Kernel version:
Darwin Kernel Version 19.6.0: Mon Apr 12 20:57:45 PDT 2021; root:xnu-6153.141.28.1~1/RELEASE_X86_64
Kernel UUID: BB1171FD-A9E3-3D24-92F7-F4DD45974EFD
Kernel slide: 0x0000000005400000
Kernel text base: 0xffffff8005600000
__HIB text base: 0xffffff8005500000
System model name: iMac14,3 (Mac-77EB7D7DAF985301)
System shutdown begun: YES
Panic diags file available: YES (0x0)

System uptime in nanoseconds: 98181584939081
last loaded kext at 51431650525384: >!A!BMultitouch 97 (addr 0xffffff7f89306000, size 53248)
last unloaded kext at 13836867237347: >!AInputDeviceSupport 3440.8 (addr 0xffffff7f89322000, size 110592)
loaded kexts:
com.getdropbox.dropbox.kext 1.13.0
>!A!BMultitouch 97
@filesystems.smbfs 3.4.4
>AudioAUUC 1.70
@AGDCPluginDisplayMetrics 5.2.7
@fileutil 20.036.15
>!AHV 1
|IOUserEthernet 1.0.1
|IO!BSerialManager 7.0.6f8
>AGPM 111.4.4
>X86PlatformShim 1.0.0
>!APlatformEnabler 2.7.0d0
>pmtelemetry 1
>!AUpstreamUserClient 3.6.8
>!AMikeyHIDDriver 131
@Dont_Steal_Mac_OS_X 7.0.0
>!AHDA 283.15
@GeForce 14.0.0
>!A!IHD5000Graphics 14.0.7
>!AMikeyDriver 283.15
>eficheck 1
>!AThunderboltIP 3.1.4
|!ABCM5701Ethernet 10.3.5
>!ASMCLMU 212
>!ALPC 3.1
>AirPort.BrcmNIC 1400.1.1
>!A!ISlowAdaptiveClocking 4.0.0
>!AMCCSControl 1.14
>!A!IFramebufferAzul 14.0.7
@filesystems.autofs 3.0
>!AVirtIO 1.0
@filesystems.hfs.kext 522.100.5
@!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1
@BootCache 40
@!AFSCompression.!AFSCompressionTypeZlib 1.0.0
@filesystems.apfs 1412.141.2
@private.KextAudit 1.0
>!ASDXC 1.7.7
>!AAHCIPort 341.140.1
>!ARTC 2.0
>!AACPIButtons 6.1
>!AHPET 1.8
>!ASMBIOS 2.1
>!AACPIEC 6.1
>!AAPIC 1.7
$!AImage4 1
@nke.applicationfirewall 303
$TMSafetyNet 8
@!ASystemPolicy 2.0.0
|EndpointSecurity 1
>!AMultitouchDriver 3440.1
>!AInputDeviceSupport 3440.8
>!A!BHIDKeyboard 209
>!AHIDKeyboard 209
>IO!BHIDDriver 7.0.6f8
|IOAVB!F 850.1
@plugin.IOgPTPPlugin 840.3
>DspFuncLib 283.15
@kext.OSvKernDSPLib 529
@nvidia.driver.NVDAGK100Hal 14.0.0
@nvidia.driver.NVDAResman 14.0.0
@!AGPUWrangler 5.2.7
|IONDRVSupport 576.1
>!AHDA!C 283.15
|IOHDA!F 283.15
|IOEthernetAVB!C 1.1.0
>!ASMBusPCI 1.0.14d1
|IO80211!F 1200.12.2b1
>mDNSOffloadUserClient 1.0.1b8
>corecapture 1.0.4
|IOSkywalk!F 1
>X86PlatformPlugin 1.0.0
>IOPlatformPlugin!F 6.0.0d8
|IOSlowAdaptiveClocking!F 1.0.0
>!ASMBus!C 1.0.18d1
>!AThunderboltEDMSink 4.2.3
@!AGraphicsDeviceControl 5.2.7
|IOAccelerator!F2 438.7.4
|IOGraphics!F 576.1
@kext.triggers 1.0
|Broadcom!BHost!CUSBTransport 7.0.6f8
|IO!BHost!CUSBTransport 7.0.6f8
|IO!BHost!CTransport 7.0.6f8
|IO!B!F 7.0.6f8
|IO!BPacketLogger 7.0.6f8
>usb.!UHub 1.2
>usb.networking 5.0.0
>usb.!UHostCompositeDevice 1.2
|IOAudio!F 300.2
@vecLib.kext 1.2.0
|IOSerial!F 11
|IOSurface 269.11
@filesystems.hfs.encodings.kext 1
>!AThunderboltDPOutAdapter 6.2.6
>!AThunderboltDPInAdapter 6.2.6
>!AThunderboltDPAdapter!F 6.2.6
>!AThunderboltPCIDownAdapter 2.5.4
|IOAHCIBlock!S 316.100.5
>!AThunderboltNHI 5.8.6
|IOThunderbolt!F 7.6.1
|IOUSB!F 900.4.2
|IOAHCI!F 290.0.1
>usb.!UXHCIPCI 1.2
>usb.!UXHCI 1.2
>!AEFINVRAM 2.1
>!AEFIRuntime 2.1
|IOSMBus!F 1.1
|IOHID!F 2.0.0
$quarantine 4
$sandbox 300.0
@kext.!AMatch 1.0.0d1
>DiskImages 493.0.0
>!AFDEKeyStore 28.30
>!AEffaceable!S 1.0
>!ASSE 1.0
>!AKeyStore 2
>!UTDM 489.120.1
|IOSCSIBlockCommandsDevice 422.120.3
>!ACredentialManager 1.0
>KernelRelayHost 1
>!ASEPManager 1.0.1
>IOSlaveProcessor 1
|IOTimeSync!F 840.3
|IONetworking!F 3.4
|IOUSBMass!SDriver 157.140.1
|IOSCSIArchitectureModel!F 422.120.3
|IO!S!F 2.1
|IOUSBHost!F 1.2
>!UHostMergeProperties 1.2
>usb.!UCommon 1.0
>!ABusPower!C 1.0
|CoreAnalytics!F 1
>!AMobileFileIntegrity 1.0.5
@kext.CoreTrust 1
|IOReport!F 47
>!AACPIPlatform 6.1
>!ASMC 3.1.9
>watchdog 1
|IOPCI!F 2.9
|IOACPI!F 1.4
@kec.pthread 1
@kec.Libm 1
@kec.corecrypto 1.0

 

[Cory Cooper]

Hello and welcome.

That looks like a iMac (21.5-inch, Late 2013) running macOS 10.15.7 Catalina, correct?

Yes it could be a software issue. I do see Dropbox in the panic log - have you been running that for a while and is it up to date?

-How full is the drive?
-Any third-party apps like MacKeeper or antivirus installed?
-Have you tried disconnecting all external devices/peripherals except the keyboard and mouse?

You could try holding the Shift key when powering it on to startup in safe mode. Then shut down completely and then power on.

C

 

[Bshute]

Hello and welcome.

That looks like a iMac (21.5-inch, Late 2013) running macOS 10.15.7 Catalina, correct?

Yes it could be a software issue. I do see Dropbox in the panic log - have you been running that for a while and is it up to date?

-How full is the drive?
-Any third-party apps like MacKeeper or antivirus installed?
-Have you tried disconnecting all external devices/peripherals except the keyboard and mouse?

You could try holding the Shift key when powering it on to startup in safe mode. Then shut down completely and then power on.

C

Thanks. Correct re: iMac and macOS.
Drive has 847.26 GB free. No antivirus or MacKeeper, but I do have SugarSync backup.
It looks life Dropbox is the problem. I turned off "Open at login" and after opening it, quit before shutting down and shut down without a problem.
I have been running it for several years and it is, as far as I can tell, up to date.
I'll wait another day or two before making this as solved, just to make sure.
Thanks again for your help

 

[Cory Cooper]

No worries...

I have seen the Dropbox application cause some issues, but not always.

Keep us posted and be well.

C

 

[Bshute]

Oops - spoke too soon. The problem recurred yesterday with no sign of Dropbox. (I turned off Open at login and did not open it all day.) The "report" seemed shorter, but I didn't capture it. I'll continue to monitor.