Setup:  no 3rd party loaded Kexts, Sonnet Card and R4i; Sonnet Card formatted as APFS with softRAID

panic(cpu 2 caller 0xffffff800adf9a25): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds
service: com.apple.logd, total successful checkins since load (26260 seconds ago): 2627, last successful checkin: 0 seconds ago
service: com.apple.WindowServer, total successful checkins since load (26230 seconds ago): 2611, last successful checkin: 120 seconds ago
service: com.apple.remoted, total successful checkins since load (26260 seconds ago): 2625, last successful checkin: 0 seconds ago

Backtrace (CPU 2), Frame : Return Address
0xffffffa20707b670 : 0xffffff8007a8e0dd 
0xffffffa20707b6c0 : 0xffffff8007bd4f33 
0xffffffa20707b700 : 0xffffff8007bc552a 
0xffffffa20707b750 : 0xffffff8007a32a2f 
0xffffffa20707b770 : 0xffffff8007a8d8fd 
0xffffffa20707b890 : 0xffffff8007a8dbf3 
0xffffffa20707b900 : 0xffffff800829d884 
0xffffffa20707b970 : 0xffffff800adf9a25 
0xffffffa20707b980 : 0xffffff800adf9660 
0xffffffa20707b9a0 : 0xffffff800821e13e 
0xffffffa20707b9f0 : 0xffffff800adf8a34 
0xffffffa20707bb20 : 0xffffff800822837b 
0xffffffa20707bc80 : 0xffffff8007b80961 
0xffffffa20707bd90 : 0xffffff8007a9375d 
0xffffffa20707be00 : 0xffffff8007a69cf5 
0xffffffa20707be60 : 0xffffff8007a81312 
0xffffffa20707bef0 : 0xffffff8007ba982d 
0xffffffa20707bfa0 : 0xffffff8007a33216 
      Kernel Extensions in backtrace:
         com.apple.driver.watchdog(1.0)[C29AFC04-7113-39AA-80DF-00F4DDAD0F46]@0xffffff800adf7000->0xffffff800adf9fff

Process name corresponding to current thread: watchdogd
Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev

Mac OS version:
20F71

Kernel version:
Darwin Kernel Version 20.5.0: Sat May  8 05:10:33 PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64
Kernel UUID: 52A1E876-863E-38E3-AC80-09BBAB13B752
KernelCache slide: 0x0000000007800000
KernelCache base:  0xffffff8007a00000
Kernel slide:      0x0000000007810000
Kernel text base:  0xffffff8007a10000
__HIB  text base: 0xffffff8007900000
System model name: MacPro7,1 (Mac-27AD2F918AE68F61)
System shutdown begun: NO
Hibernation exit count: 0

System uptime in nanoseconds: 26265864211492
Last Sleep:           absolute           base_tsc          base_nano
  Uptime  : 0x000017e37f818f05
  Sleep   : 0x0000000000000000 0x0000000000000000 0x0000000000000000
  Wake    : 0x0000000000000000 0x000009676f57c112 0x0000000000000000
last started kext at 115793448339: @filesystems.smbfs	3.6 (addr 0xffffff7fa333a000, size 487424)
last stopped kext at 26202979824697: >!AFIVRDriver	4.1.0 (addr 0xffffff7fa104b000, size 8192)
loaded kexts:
com.softraid.driver.SoftRAID	6.0.5
com.promise.driver.stex	6.2.13
@filesystems.smbfs	3.6
|SCSITaskUserClient	436.121.1
>AGPM	122.1
>!APlatformEnabler	2.7.0d0
>X86PlatformShim	1.0.0
@filesystems.autofs	3.0
@fileutil	20.036.15
>!AHIDALSService	1
>!AUpstreamUserClient	3.6.8
>!AMCCSControl	1.14
@kext.AMDRadeonX6000	4.0.5
@kext.AMDRadeonServiceManager	4.0.5
>!AGraphicsDevicePolicy	6.3.3
>!A!IPCHPMC	2.0.1
>BridgeAudioCommunication	140.4
>!ABridgeAudio!C	140.4
@AGDCPluginDisplayMetrics	6.3.3
>!AAVEBridge	6.1
>pmtelemetry	1
|IOUserEthernet	1.0.1
>usb.!UUserHCI	1
|IO!BSerialManager	8.0.5d7
@Dont_Steal_Mac_OS_X	7.0.0
>!AHV	1
>!ADiskImages2	1
>!A!IMCEReporter	115
>!AGFXHDA	100.1.433
>!A!ISlowAdaptiveClocking	4.0.0
>!AThunderboltIP	4.0.3
@!AEthernetAquantiaAqtionFirmware	1.0.36
>!ATopCaseHIDEventDriver	4050.1
>!UTopCaseDriver	4050.1
>BCMWLANFirmware4378.Hashstore	1
>BCMWLANFirmware4377.Hashstore	1
>BCMWLANFirmware4364.Hashstore	1
>BCMWLANFirmware4355.Hashstore	1
>!AFileSystemDriver	3.0.1
@filesystems.tmpfs	1
@filesystems.hfs.kext	556.100.11
@BootCache	40
@!AFSCompression.!AFSCompressionTypeZlib	1.0.0
@!AFSCompression.!AFSCompressionTypeDataless	1.0.0d1
>!ABCMWLANBusInterfacePCIeMac	1
@filesystems.apfs	1677.120.9
@private.KextAudit	1.0
>!AAHCIPort	346.100.2
>!AACPIButtons	6.1
>!ASMBIOS	2.1
>!AACPIEC	6.1
>!AAPIC	1.7
@!ASystemPolicy	2.0.0
@nke.applicationfirewall	311
|IOKitRegistryCompatibility	1
|EndpointSecurity	1
|IOAVB!F	940.4
@plugin.IOgPTPPlugin	985.2
|IOEthernetAVB!C	1.1.0
@kext.triggers	1.0
|IO!BHost!CUARTTransport	8.0.5d7
|IO!BHost!CTransport	8.0.5d7
>!ASMBus!C	1.0.18d1
|IOAccelerator!F2	442.9
@kext.AMDRadeonX6700HWLibs	1.0
@kext.AMDRadeonX6000HWServices	4.0.5
>!AGraphicsControl	6.3.3
@kext.AMDRadeonX6000Framebuffer	4.0.5
>X86PlatformPlugin	1.0.0
>IOPlatformPlugin!F	6.0.0d8
>!UAudio	405.39
>!A16X50Serial	3.2
|IONDRVSupport	585.1
|IOAudio!F	300.6.1
@vecLib.kext	1.2.0
@!AGPUWrangler	6.3.3
>usb.cdc.acm	5.0.0
>usb.serial	6.0.0
|IOSlowAdaptiveClocking!F	1.0.0
@kext.AMDSupport	4.0.5
@!AGraphicsDeviceControl	6.3.3
|IOGraphics!F	585.1
>!AHS!BDriver	4050.1
>IO!BHIDDriver	8.0.5d7
>usb.IOUSBHostHIDDevice	1.2
>!AMultitouchDriver	4440.3
>!AInputDeviceSupport	4400.35
>!AHIDKeyboard	224
>usb.cdc.ecm	5.0.0
>usb.cdc.ncm	5.0.0
>usb.cdc	5.0.0
>usb.networking	5.0.0
>usb.!UHostCompositeDevice	1.2
>usb.!UHub	1.2
>!AThunderboltDPOutAdapter	8.1.4
>!AThunderboltPCIUpAdapter	4.1.1
>!AHPM	3.4.4
>!A!ILpssI2C!C	3.0.60
>!A!ILpssDmac	3.0.60
>!AThunderboltDPInAdapter	8.1.4
>!AThunderboltDPAdapter!F	8.1.4
>!AThunderboltPCIDownAdapter	4.1.1
>!ABSDKextStarter	3
|IOSurface	290.8.1
@filesystems.hfs.encodings.kext	1
>!AEthernetAquantiaAqtion	1.0.64
>!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
>!AThunderboltNHI	7.2.8
|IOThunderbolt!F	9.3.2
>!AXsanScheme	3
|IOSCSIParallel!F	3.0.0
>usb.!UHostPacketFilter	1.0
|IOUSB!F	900.4.2
>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
>!A!ILpssI2C	3.0.60
|IOAHCI!F	294.100.1
>usb.!UXHCIPCI	1.2
>usb.!UXHCI	1.2
>!A!ILpssGspi	3.0.60
>!AEFINVRAM	2.1
>!AEFIRuntime	2.1
>!ASMCRTC	1.0
|IOSMBus!F	1.1
|IOHID!F	2.0.0
$!AImage4	3.0.0
|IOTimeSync!F	985.2
|IONetworking!F	3.4
>DiskImages	493.0.0
|IO!B!F	8.0.5d7
|IOReport!F	47
|IO!BPacketLogger	8.0.5d7
$quarantine	4
$sandbox	300.0
@kext.!AMatch	1.0.0d1
|CoreAnalytics!F	1
>!ASSE	1.0
>!AKeyStore	2
>!UTDM	511.120.2
|IOUSBMass!SDriver	184.121.1
|IOSCSIBlockCommandsDevice	436.121.1
|IO!S!F	2.1
|IOSCSIArchitectureModel!F	436.121.1
>!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