panic(cpu 0 caller 0xffffff8010322996): "Refcount negative: -559038738\n"com.apple./Library/Caches/com.apple.xbs/Sources/xnu/xnu-3789.73.11/osfmk/kern/thread_call.c:799
Backtrace (CPU 0), Frame : Return Address
0xffffff820911bc70 : 0xffffff80102e850c mach_kernel : _panic + 0xec
0xffffff820911bcf0 : 0xffffff8010322996 mach_kernel : _thread_call_free + 0x96
0xffffff820911bd20 : 0xffffff7f9280459f net.osx86.kexts.GenericUSBXHCI : __ZN25GenericUSBXHCIEventSource12checkForWorkEv + 0x2427
0xffffff820911bd40 : 0xffffff7f927fe15f net.osx86.kexts.GenericUSBXHCI : __ZN14GenericUSBXHCI11UIMFinalizeEv + 0x1b3
0xffffff820911bd60 : 0xffffff7f927fd9a6 net.osx86.kexts.GenericUSBXHCI : __ZN14GenericUSBXHCI13UIMInitializeEP9IOService + 0x27e
0xffffff820911bd90 : 0xffffff7f90d8233c com.apple.iokit.IOUSBFamily : __ZN15IOUSBController5startEP9IOService + 0x508
0xffffff820911bdd0 : 0xffffff7f90dbd227 com.apple.iokit.IOUSBFamily : __ZN17IOUSBControllerV25startEP9IOService + 0x35
0xffffff820911be00 : 0xffffff7f90dc2837 com.apple.iokit.IOUSBFamily : __ZN17IOUSBControllerV35startEP9IOService + 0x13b
0xffffff820911be40 : 0xffffff801089744d mach_kernel : __ZN9IOService14startCandidateEPS_ + 0x6d
0xffffff820911be80 : 0xffffff801089719e mach_kernel : __ZN9IOService15probeCandidatesEP12OSOrderedSet + 0x98e
0xffffff820911bf10 : 0xffffff8010896756 mach_kernel : __ZN9IOService14doServiceMatchEj + 0x236
0xffffff820911bf60 : 0xffffff801089816e mach_kernel : __ZN15_IOConfigThread4mainEPvi + 0x14e
0xffffff820911bfb0 : 0xffffff80102988f7 mach_kernel : _call_continuation + 0x17
      Kernel Extensions in backtrace:
         com.apple.iokit.IOUSBFamily(900.4.1)[1B35F2B8-7EB1-3F3A-86DD-35F07996E335]com.apple.0xffffff7f90d77000-com.apple.driver.0xffffff7f90e10fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[B6108DD0-5CA0-3D92-B1A5-74805707226A]com.apple.0xffffff7f90b5b000
            dependency: com.apple.iokit.IOUSBHostFamily(1.1)[896273C6-36AE-30AC-9274-1BCB7C9A4062]com.apple.0xffffff7f90d06000
         net.osx86.kexts.GenericUSBXHCI(1.2.8d7)[00000000-0000-0000-0000-000000000000]com.apple.0xffffff7f927f7000-com.apple.driver.0xffffff7f92816fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[B6108DD0-5CA0-3D92-B1A5-74805707226A]com.apple.0xffffff7f90b5b000
            dependency: com.apple.iokit.IOUSBFamily(900.4.1)[1B35F2B8-7EB1-3F3A-86DD-35F07996E335]com.apple.0xffffff7f90d77000

BSD process name corresponding to current thread: kernel_task
Boot args: -v keepsyms=1 debug=0x100 alcid=1 agdpmod=pikera 

Mac OS version:
Not yet set

Kernel version:
Darwin Kernel Version 16.7.0: Tue Jan 30 11:27:06 PST 2018; root:xnu-3789.73.11~1/RELEASE_X86_64
Kernel UUID: 50C7E8E4-330F-3D92-B9D1-2B4900417AA8
Kernel slide:     0x0000000010000000
Kernel text base: 0xffffff8010200000
__HIB  text base: 0xffffff8010100000
System model name: MacPro6,1 (Mac-F60DEB81FF30ACF6)

System uptime in nanoseconds: 1486049562
last loaded kext at 1319645378: com.apple.driver.AppleUSBLegacyHub	900.4.1 (addr 0xffffff7f914cb000, size 122880)
loaded kexts:
net.osx86.kexts.GenericUSBXHCI	1.2.8d7
ru.joedm.SMCSuperIO	1.3.0
com.insanelymac.IntelMausiEthernet	2.3.0
as.vit9696.WhateverGreen	1.6.2
as.vit9696.AppleALC	1.7.7
as.vit9696.SMCProcessor	1.3.0
as.vit9696.VirtualSMC	1.3.0
as.vit9696.Lilu	1.6.2
com.apple.driver.AppleUSBLegacyHub	900.4.1
com.apple.driver.AppleAHCIPort	326.60.1
com.apple.driver.AppleACPIButtons	5.0
com.apple.driver.AppleRTC	2.0
com.apple.driver.AppleHPET	1.8
com.apple.driver.AppleSMBIOS	2.1
com.apple.driver.AppleAPIC	1.7
com.apple.nke.applicationfirewall	172
com.apple.security.quarantine	3
com.apple.security.TMSafetyNet	8
com.apple.driver.usb.AppleUSBEHCIPCI	1.1
com.apple.driver.usb.AppleUSBEHCI	1.1
com.apple.iokit.IOAHCIFamily	288
com.apple.iokit.IOUSBFamily	900.4.1
com.apple.iokit.IONVMeFamily	2.1.0
com.apple.driver.AppleIntelLpssGspi	3.0.60
com.apple.iokit.IONetworkingFamily	3.2
com.apple.driver.usb.AppleUSBXHCIPCI	1.1
com.apple.driver.usb.AppleUSBXHCI	1.1
com.apple.driver.AppleEFINVRAM	2.1
com.apple.iokit.IOHIDFamily	2.0.0
com.apple.driver.AppleEFIRuntime	2.1
com.apple.driver.AppleKeyStore	2
com.apple.driver.AppleCredentialManager	1.0
com.apple.driver.KernelRelayHost	1
com.apple.iokit.IOUSBHostFamily	1.1
com.apple.driver.AppleBusPowerController	1.0
com.apple.driver.DiskImages	444.50.17
com.apple.iokit.IOReportFamily	31
com.apple.security.sandbox	300.0
com.apple.iokit.IOStorageFamily	2.1
com.apple.kext.AppleMatch	1.0.0d1
com.apple.driver.AppleMobileFileIntegrity	1.0.5
com.apple.driver.AppleFDEKeyStore	28.30
com.apple.driver.AppleACPIPlatform	5.0
com.apple.iokit.IOPCIFamily	2.9
com.apple.iokit.IOACPIFamily	1.4
com.apple.kec.Libm	1
com.apple.kec.pthread	1
com.apple.kec.corecrypto	1.0