I made a simple Bash script to back up my Mac through Time Machine over network. It mounts a server through SSHFS using MacFUSE, mounts a HFS+ sparsebundle disk image inside that mount, and tells Time Machine to back up to it, unmounting them when it's done. It usually works just fine, but a kernel panic happens about once in every 6 or so times when it tries to unmount the sparsebundle disk image. The kernel panics seemed to happen both in MacOS Catalina and Big Sur. The same problem never changed even when I changed from a Macbook Air late 2015 to a 2020 MacBook Pro, so I believe the Mac hardware might be irrelevant.
Is there a way to tell if this is a problem relating to the Apple DiskImages driver, the MacFUSE kernel extension, or something different? Should I consult Apple or the maker of MacFUSE if there is no other way to correct this?
Here is the Kernel Panic backtrace:
panic(cpu 3 caller 0xffffff801ad85bc4): "wire_count == 0, m = 0xffffff8032fd02b0, obj = 0xffffff803d9b9d00\n"@/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-7195.81.3/osfmk/vm/vm_pageout.c:7572
Backtrace (CPU 3), Frame : Return Address
0xffffffa090a739d0 : 0xffffff801acbab4d
0xffffffa090a73a20 : 0xffffff801adfd7e3
0xffffffa090a73a60 : 0xffffff801adede1a
0xffffffa090a73ab0 : 0xffffff801ac5fa2f
0xffffffa090a73ad0 : 0xffffff801acba3ed
0xffffffa090a73bf0 : 0xffffff801acba6d8
0xffffffa090a73c60 : 0xffffff801b4bef9a
0xffffffa090a73cd0 : 0xffffff801ad85bc4
0xffffffa090a73e20 : 0xffffff801b42ad4f
0xffffffa090a73e70 : 0xffffff801d2969c1
0xffffffa090a73e90 : 0xffffff801d2960aa
0xffffffa090a73eb0 : 0xffffff801d296000
0xffffffa090a73ed0 : 0xffffff801b3fc9f7
0xffffffa090a73ef0 : 0xffffff801b3f9a7d
0xffffffa090a73f30 : 0xffffff801b41691e
0xffffffa090a73f70 : 0xffffff801b415f06
0xffffffa090a73fa0 : 0xffffff801ac5f13e
Kernel Extensions in backtrace:
com.apple.driver.DiskImages(493.0)[11E51AF9-6467-39AC-89A2-A62CE763F298]@0xffffff801d295000->0xffffff801d2a0fff
dependency: com.apple.iokit.IOStorageFamily(2.1)[B5300908-BF34-3D47-8776-FB154A6DEE4C]@0xffffff801d73f000->0xffffff801d750fff
Process name corresponding to current thread: kernel_task
Boot args: -v chunklist-security-epoch=0 -chunklist-no-rev2-dev
Mac OS version:
20D74
Kernel version:
Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64
Kernel UUID: C86236B2-4976-3542-80CA-74A6B8B4BA03
KernelCache slide: 0x000000001aa00000
KernelCache base: 0xffffff801ac00000
Kernel slide: 0x000000001aa10000
Kernel text base: 0xffffff801ac10000
__HIB text base: 0xffffff801ab00000
System model name: MacBookPro16,3 (Mac-E7203C0F68AA0004)
System shutdown begun: NO
Hibernation exit count: 0
System uptime in nanoseconds: 11092066957957
Last Sleep: absolute base_tsc base_nano
Uptime : 0x00000a1692b5fd2e
Sleep : 0x00000877d70daad5 0x00000bfb283e2420 0x000008693a36c209
Wake : 0x00000877e168dd7b 0x00000c4e1fdaf8c6 0x00000877e012bf29
last started kext at 11091852477214: >!AXsanScheme 3 (addr 0xffffff801c467000, size 12288)
last stopped kext at 10623433685325: >!AXsanScheme 3 (addr 0xffffff801c467000, size 12288)
loaded kexts:
io.macfuse.filesystems.macfuse 2053.20
org.virtualbox.kext.VBoxNetAdp 6.1.18
org.virtualbox.kext.VBoxNetFlt 6.1.18
org.virtualbox.kext.VBoxUSB 6.1.18
org.virtualbox.kext.VBoxDrv 6.1.18
>AGPM 119
>!APlatformEnabler 2.7.0d0
>X86PlatformShim 1.0.0
@filesystems.autofs 3.0
@fileutil 20.036.15
>!ATopCaseHIDEventDriver 4030.5
>!AHIDALSService 1
>!AGraphicsDevicePolicy 6.2.2
>!AUpstreamUserClient 3.6.8
@AGDCPluginDisplayMetrics 6.2.2
>pmtelemetry 1
>!A!IKBLGraphics 16.0.1
>LuaHardwareAccess 1.0.16
|IOUserEthernet 1.0.1
|IO!BSerialManager 8.0.3d9
@Dont_Steal_Mac_OS_X 7.0.0
>!AHV 1
>!ADiskImages2 1
>!A!ISlowAdaptiveClocking 4.0.0
>!ABridgeAudio!C 100.2
>!A!ICFLGraphicsFramebuffer 16.0.1
>!A!IPCHPMC 2.0.1
>BridgeAudioCommunication 100.2
>!AAVEBridge 6.1
>!ABacklight 180.3
>!AThunderboltIP 4.0.3
>!AGFXHDA 100.1.431
>!AMCCSControl 1.14
@filesystems.apfs 1677.81.1
>BCMWLANFirmware4378.Hashstore 1
>BCMWLANFirmware4377.Hashstore 1
>BCMWLANFirmware4364.Hashstore 1
>BCMWLANFirmware4355.Hashstore 1
>!A!BModule 1
@filesystems.tmpfs 1
@filesystems.hfs.kext 556.60.1
@BootCache 40
@!AFSCompression.!AFSCompressionTypeZlib 1.0.0
@!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1
@private.KextAudit 1.0
>!ASmartBatteryManager 161.0.0
>!ABCMWLANBusInterfacePCIeMac 1
>!AACPIButtons 6.1
>!ASMBIOS 2.1
>!AACPIEC 6.1
>!AAPIC 1.7
@!ASystemPolicy 2.0.0
@nke.applicationfirewall 310
|IOKitRegistryCompatibility 1
|EndpointSecurity 1
>!AXsanScheme 3
|IOUSBUserClient 900.4.2
@kext.triggers 1.0
>!AHIDKeyboard 223
>!AActuatorDriver 4400.28
>!AMultitouchDriver 4400.28
>!AInputDeviceSupport 4400.35
>!AHS!BDriver 4030.5
>IO!BHIDDriver 8.0.3d9
>!AGraphicsControl 6.2.2
|IOAVB!F 930.1
>X86PlatformPlugin 1.0.0
@!AGPUWrangler 6.2.2
|IOSlowAdaptiveClocking!F 1.0.0
|IOAccelerator!F2 439.52
>!A!ILpssUARTv1 3.0.60
>!A!ILpssUARTCommon 3.0.60
>!AOnboardSerial 1.0
>IOPlatformPlugin!F 6.0.0d8
@!AGraphicsDeviceControl 6.2.2
>!ABacklightExpert 1.1.0
|IONDRVSupport 585
|IOAudio!F 300.6.1
@vecLib.kext 1.2.0
|IOGraphics!F 585
>!ASMBus!C 1.0.18d1
@plugin.IOgPTPPlugin 900.11
|IOEthernetAVB!C 1.1.0
>usb.cdc.ncm 5.0.0
>usb.cdc 5.0.0
>usb.networking 5.0.0
>usb.!UHostCompositeDevice 1.2
>!AThunderboltPCIDownAdapter 4.1.1
>!AThunderboltDPInAdapter 8.1.4
>!AThunderboltDPAdapter!F 8.1.4
>!AHPM 3.4.4
>!A!ILpssI2C!C 3.0.60
>!A!ILpssDmac 3.0.60
>usb.!UVHCIBCE 1.2
>usb.!UVHCICommonBCE 1.0
>usb.!UVHCI 1.2
>usb.!UVHCICommon 1.0
>!AEffaceableNOR 1.0
|IOBufferCopy!C 1.1.0
|IOBufferCopyEngine!F 1
|IONVMe!F 2.1.0
>!AThunderboltNHI 7.2.8
|IOThunderbolt!F 9.3.2
>IO!BHost!CPCIeTransport 8.0.3d9
|IO!BHost!CTransport 8.0.3d9
>!AConvergedIPCOLYBTControl 1
>!A!BDebug 1
>!A!BDebugService 1
>!AConvergedPCI 1
>!A!ILpssI2C 3.0.60
>usb.!UXHCIPCI 1.2
>usb.!UXHCI 1.2
>!ABSDKextStarter 3
|IOSurface 289.3
@filesystems.hfs.encodings.kext 1
|IOUSB!F 900.4.2
>!AEFINVRAM 2.1
>!AMultiFunctionManagerMac 1
>!AEFIRuntime 2.1
>!ABCMWLANCoreMac 1.0.0
|IOSerial!F 11
|IO80211!FV2 1200.12.2b1
|IOSkywalk!F 1
>mDNSOffloadUserClient 1.0.1b8
>IOImageLoader 1.0.0
>corecapture 1.0.4
>!ASMCRTC 1.0
|IOSMBus!F 1.1
|IOHID!F 2.0.0
$!AImage4 3.0.0
|IOTimeSync!F 900.11
|IONetworking!F 3.4
>DiskImages 493.0.0
|IO!B!F 8.0.3d9
|IOReport!F 47
|IO!BPacketLogger 8.0.3d9
$quarantine 4
$sandbox 300.0
@kext.!AMatch 1.0.0d1
|CoreAnalytics!F 1
>!ASSE 1.0
>!AKeyStore 2
>!UTDM 511.60.2
|IOUSBMass!SDriver 184.40.6
|IOSCSIBlockCommandsDevice 436.40.6
|IO!S!F 2.1
|IOSCSIArchitectureModel!F 436.40.6
>!AMobileFileIntegrity 1.0.5
@kext.CoreTrust 1
>!AFDEKeyStore 28.30
>!AEffaceable!S 1.0
>!ACredentialManager 1.0
>KernelRelayHost 1
|IOUSBHost!F 1.2
>!UHostMergeProperties 1.2
>usb.!UCommon 1.0
>!ABusPower!C 1.0
>!ASEPManager 1.0.1
>IOSlaveProcessor 1
>!AACPIPlatform 6.1
>!ASMC 3.1.9
|IOPCI!F 2.9
|IOACPI!F 1.4
>watchdog 1
@kec.pthread 1
@kec.corecrypto 11.1
@kec.Libm 1
