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I have an iMac late 2012 with 24GB or RAM and 3 USB disks connected to it, all running time machine in sequence.

After updating to catalina, every time I shutdown the system it takes ages to shutdown and then after reaching the shutdown state, sometimes the screen turns white again, as if it would start again and after a while the screen turns black again with a shutdown message at the middle, in several languages.

Then, if I start the system, I see this crash message:

panic(cpu 1 caller 0xffffff7fa6c96aae): watchdog timeout: no checkins from watchdogd in 184 seconds (97 totalcheckins since monitoring last enabled), shutdown in progress
Backtrace (CPU 1), Frame : Return Address
0xffffff82e0b13c40 : 0xffffff802553f98b 
0xffffff82e0b13c90 : 0xffffff8025676c15 
0xffffff82e0b13cd0 : 0xffffff802566861e 
0xffffff82e0b13d20 : 0xffffff80254e6a40 
0xffffff82e0b13d40 : 0xffffff802553f077 
0xffffff82e0b13e40 : 0xffffff802553f45b 
0xffffff82e0b13e90 : 0xffffff8025cd2e05 
0xffffff82e0b13f00 : 0xffffff7fa6c96aae 
0xffffff82e0b13f10 : 0xffffff7fa6c96472 
0xffffff82e0b13f50 : 0xffffff7fa6cabfd6 
0xffffff82e0b13fa0 : 0xffffff80254e613e 
      Kernel Extensions in backtrace:
         com.apple.driver.watchdog(1.0)[58392D62-D9E8-3022-85C1-B78AC93B9167]@0xffffff7fa6c95000->0xffffff7fa6c9dfff
         com.apple.driver.AppleSMC(3.1.9)[EB9D605D-85B1-3506-8B2E-ABD195817A4F]@0xffffff7fa6c9e000->0xffffff7fa6cbcfff
            dependency: com.apple.iokit.IOACPIFamily(1.4)[9BA2613C-A129-3EDD-8DC1-2CFF6B62B832]@0xffffff7fa6c8c000
            dependency: com.apple.driver.watchdog(1)[58392D62-D9E8-3022-85C1-B78AC93B9167]@0xffffff7fa6c95000
            dependency: com.apple.iokit.IOPCIFamily(2.9)[E6E855AD-A5B2-3518-A997-1384B4360708]@0xffffff7fa5f2f000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
19A583

Kernel version:
Darwin Kernel Version 19.0.0: Wed Sep 25 20:18:50 PDT 2019; root:xnu-6153.11.26~2/RELEASE_X86_64
Kernel UUID: 70EDD61F-8D909B78160
Kernel slide:     0x0000000025200000
Kernel text base: 0xffffff8025400000
__HIB  text base: 0xffffff8025300000
System model name: iMac13,2 (Mac-FC02E91DDD3FA6A4)
System shutdown begun: YES
Panic diags file available: NO (0xe00002cd)

System uptime in nanoseconds: 1201012930700
last loaded kext at 692174279981: @filesystems.msdosfs  1.10 (addr 0xffffff7fa9e1c000, size 69632)
last unloaded kext at 67316368087: >!AXsanScheme    3 (addr 0xffffff7fa89a7000, size 40960)
loaded kexts:
com.Cycling74.driver.Soundflower    2
@filesystems.msdosfs    1.10
>!A!BMultitouch 97
>AudioAUUC  1.70
>!AGraphicsDevicePolicy 4.1.46
@AGDCPluginDisplayMetrics   4.1.46
>!AHV   1
|IOUserEthernet 1.0.1
|IO!BSerialManager  7.0.0f8
>AGPM   111.1.18
>!APlatformEnabler  2.7.0d0
>X86PlatformShim    1.0.0
>pmtelemetry    1
>!AUpstreamUserClient   3.6.8
>!AHDAHardwareConfigDriver  283.14
>!AMikeyHIDDriver   131
@Dont_Steal_Mac_OS_X    7.0.0
@GeForce    14.0.0
>!A!IHD4000Graphics 14.0.0
>AGDCBacklightControl   4.1.46
>!AHDA  283.14
>eficheck   1
>!AMikeyDriver  283.14
>ACPI_SMC_PlatformPlugin    1.0.0
>!AThunderboltIP    3.1.3
>!ABacklight    170.18
>!ALPC  3.1
>!ASMCLMU   212
>!AFIVRDriver   4.1.0
>!A!ISlowAdaptiveClocking   4.0.0
>!A!IFramebufferCapri   14.0.0
@nvidia.NVDAStartup 14.0.0
>!AMCCSControl  1.12
@fileutil   20.036.15
@filesystems.autofs 3.0
>!AVirtIO   1.0
@filesystems.hfs.kext   522.0.9
@!AFSCompression.!AFSCompressionTypeDataless    1.0.0d1
@BootCache  40
@!AFSCompression.!AFSCompressionTypeZlib    1.0.0
@filesystems.apfs   1412.11.7
|!ABCM5701Ethernet  10.3.5
@private.KextAudit  1.0
>!ASDXC 1.7.7
>AirPort.Brcm4360   1400.1.1
>!AAHCIPort 341.0.2
>!AACPIButtons  6.1
>!ARTC  2.0
>!AHPET 1.8
>!ASMBIOS   2.1
>!AACPIEC   6.1
>!AAPIC 1.7
>!A!ICPUPowerManagementClient   222.0.0
$!AImage4   1
@nke.applicationfirewall    302
$TMSafetyNet    8
@!ASystemPolicy 2.0.0
>!A!ICPUPowerManagement 222.0.0
|EndpointSecurity   1
>usb.cdc.acm    5.0.0
>usb.serial 6.0.0
>usb.cdc.ecm    5.0.0
>usb.cdc.ncm    5.0.0
>usb.cdc    5.0.0
>!UMergeNub 900.4.2
>!AXsanScheme   3
>!A!BHIDKeyboard    209
>!AHIDKeyboard  209
>IO!BHIDDriver  7.0.0f8
>!AMultitouchDriver 3400.35
>!AInputDeviceSupport   3400.27
>!AGraphicsControl  4.1.46
|IOAVB!F    800.17
>!ASSE  1.0
@nvidia.driver.NVDAGK100Hal 14.0.0
@nvidia.driver.NVDAResman   14.0.0
>DspFuncLib 283.14
@kext.OSvKernDSPLib 529
>IOPlatformPluginLegacy 1.0.0
@!AGPUWrangler  4.1.46
>!ABacklightExpert  1.1.0
|IONDRVSupport  558.3
>!AHDA!C    283.14
|IOHDA!F    283.14
|IOAudio!F  300.2
>!ASMBusPCI 1.0.14d1
>X86PlatformPlugin  1.0.0
>IOPlatformPlugin!F 6.0.0d8
|IOSlowAdaptiveClocking!F   1.0.0
|IOAccelerator!F2   438.1.23
@!AGraphicsDeviceControl    4.1.46
>!AThunderboltEDMSink   4.2.0
>!ASMBus!C  1.0.18d1
|IOGraphics!F   558.3
@plugin.IOgPTPPlugin    800.14
@kext.triggers  1.0
>Core!S 551
|Broadcom!BHost!CUSBTransport   7.0.0f8
|IO!BHost!CUSBTransport 7.0.0f8
|IO!BHost!CTransport    7.0.0f8
|IO!B!F 7.0.0f8
|IO!BPacketLogger   7.0.0f8
>usb.IOUSBHostHIDDevice 1.2
@vecLib.kext    1.2.0
>usb.networking 5.0.0
>usb.!UHostCompositeDevice  1.2
>usb.!UHub  1.2
|IOSerial!F 11
@filesystems.hfs.encodings.kext 1
|IOSurface  269.6
>!AThunderboltDPOutAdapter  6.2.3
>!AThunderboltDPInAdapter   6.2.3
>!AThunderboltDPAdapter!F   6.2.3
>!AThunderboltPCIDownAdapter    2.5.2
>!AThunderboltNHI   5.5.8
|IOThunderbolt!F    7.4.5
|IOEthernetAVB!C    1.1.0
|IOAHCIBlock!S  316.0.5
|IO80211!F  1200.12.2b1
|IOSkywalk!F    1
>mDNSOffloadUserClient  1.0.1b8
>corecapture    1.0.4
|IOAHCI!F   290.0.1
>usb.!UEHCIPCI  1.2
>usb.!UEHCI 1.2
>usb.!UXHCIPCI  1.2
>usb.!UXHCI 1.2
>usb.!UHostPacketFilter 1.0
|IOUSB!F    900.4.2
>!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
>!AKeyStore 2
>!UTDM  489.11.2
|IOSCSIBlockCommandsDevice  422.0.2
>!ACredentialManager    1.0
>KernelRelayHost    1
>!ASEPManager   1.0.1
>IOSlaveProcessor   1
|IOUSBMass!SDriver  157.11.2
|IOSCSIArchitectureModel!F  422.0.2
|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
|IOTimeSync!F   800.14
|IONetworking!F 3.4
|IOReport!F 47
>!AACPIPlatform 6.1
>!ASMC  3.1.9
>watchdog   1
|IOPCI!F    2.9
|IOACPI!F   1.4
@kec.pthread    1
@kec.corecrypto 1.0
@kec.Libm   1

It calls my attention this line @filesystems.msdosfs... MS DOS FILE SYSTEM???? WTF!

Any ideas?

  • Does this kernel panic occur at shutdown with the USB disks disconnected? If not, could you try shutting down with each USB disk individually and see if it happens? – drivec Oct 11 at 18:34
  • pastebin.com/KQ3TZyBq here's another dump of the same problem. – ankii Oct 11 at 18:48
1

What you're looking for is this line:

com.apple.driver.AppleSMC(3.1.9)[EB9D605D-85B1-3506-8B2E-ABD195817A4F]@0xffffff7fa6c9e000->0xffffff7fa6cbcfff

It looks like SMC is sometimes damaged during the update proces. Here's how I fixed it:

  1. Start shutdown procedure normally, it will take about 3 minutes until it crashes and reboots
  2. After it reboots, don't log in - press the shutdown button (on the bottom of screen) instead. This time, it will shutdown normally.
  3. Do the SMC reset procedure described here by Apple

So far, I've tested this (and it worked) on my 2019 MacBook Pro and my friend's 2015 MacBook Pro.

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  • Brilliant! THANKS – SpaceDog Oct 14 at 16:54

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