I don’t personally have this problem but it’s obviously fairly widespread. I encourage all of you to file a bug report on this (not feedback).
I'm having the same issue after upgrading my 4,1>5,1 to 10.14.6.
Having one about 1 KP per day.
The latest KP report seemed to indicate some issue with
"AppleIntelCPUPowerManagement (220.0)":
Anonymous UUID: 2670AF2B-A1CB-62D9-8D51-40B022F9AABA
Mon Jul 29 09:16:19 2019
*** Panic Report ***
Machine-check capabilities: 0x0000000000001c09
family: 6 model: 44 stepping: 2 microcode: 31
signature: 0x206c2
Intel(R) Xeon(R) CPU X5680 @ 3.33GHz
9 error-reporting banks
Processor 12: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 13: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 14: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 15: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 16: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 17: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 18: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 19: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 20: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 21: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 22: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
Processor 23: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC1_STATUS(0x405): 0xbe00000000400e0f
IA32_MC1_ADDR(0x406): 0x000000e1e7e1e000
IA32_MC1_MISC(0x407): 0x0000000001000000
mp_kdp_enter() timed-out on cpu 8, NMI-ing
mp_kdp_enter() NMI pending on cpus: 0 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
mp_kdp_enter() timed-out during locked wait after NMI;expected 24 acks but received 1 after 17314416 loops in 1662499788 ticks
panic(cpu 8 caller 0xffffff801d4db51a): "Machine Check at 0xffffff7fa04da4f0, registers:\n" "CR0: 0x000000008001003b, CR2: 0x000000017a7f5058, CR3: 0x00000000225b2000, CR4: 0x00000000000226e0\n" "RAX: 0x0000000000000001, RBX: 0xffffff80aa57c400, RCX: 0x0000000000000001, RDX: 0x0000000000000000\n" "RSP: 0xffffff8759b7bd50, RBP: 0xffffff8759b7bd80, RSI: 0x0000000000000001, RDI: 0xffffff80aab63260\n" "R8: 0xffffff80aabb2d00, R9: 0xffffff80b822dc90, R10: 0xffffff801dc0dc78, R11: 0x00000000225b2000\n" "R12: 0xffffff7fa04f6630, R13: 0xffffff80a9d75800, R14: 0x0000000000000148, R15: 0x0000000000000001\n" "RFL: 0x0000000000000046, RIP: 0xffffff7fa04da4f0, CS: 0x0000000000000008, SS: 0x0000000000000010\n" "Error code: 0x0000000000000000\n"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-4903.270.47/osfmk/i386/trap_native.c:168
Backtrace (CPU 8), Frame : Return Address
0xffffff801d155330 : 0xffffff801d3ad6ed
0xffffff801d155380 : 0xffffff801d4e9185
0xffffff801d1553c0 : 0xffffff801d4da8ba
0xffffff801d155430 : 0xffffff801d35ab40
0xffffff801d155450 : 0xffffff801d3ad107
0xffffff801d155570 : 0xffffff801d3acf53
0xffffff801d1555e0 : 0xffffff801d4db51a
0xffffff801d1556d0 : 0xffffff801d35b39f
0xffffff8759b7bd80 : 0xffffff7fa04d2b89
0xffffff8759b7be60 : 0xffffff7fa04d1dce
0xffffff8759b7bf10 : 0xffffff801d4dc8ec
0xffffff8759b7bf30 : 0xffffff801d3cf287
0xffffff8759b7bf80 : 0xffffff801d3cf470
0xffffff8759b7bfa0 : 0xffffff801d35a0ce
Kernel Extensions in backtrace:
com.apple.driver.AppleIntelCPUPowerManagement(220.0)[E0712C0E-0EEB-3164-9DB2-2452905AC25D]@0xffffff7fa04d0000->0xffffff7fa04f8fff
BSD process name corresponding to current thread: kernel_task
Mac OS version:
18G84
Kernel version:
Darwin Kerne
EOF
System Profile:
Bluetooth: Version 6.0.14d3, 3 services, 27 devices, 1 incoming serial ports
Model: MacPro5,1, BootROM 144.0.0.0.0, 12 processors, 6-Core Intel Xeon, 3.33 GHz, 64 GB, SMC 1.39f5
Thunderbolt Bus:
Boot Volume File System Type: apfs
Graphics: Radeon RX 580, Radeon RX 580, spdisplays_pcie_device, 8 GB
USB Device: USB 2.0 Bus
USB Device: DataTraveler 2.0
USB Device: Scarlett 18i20 USB
USB Device: USB 2.0 Bus
USB Device: USB 3.0 FD
USB Device: Keyboard Hub
USB Device: Apple Keyboard
USB Device: ASM107x
USB Device: ASMT1153e
USB Device: USB Bus
USB Device: USB Bus
USB Device: USB Bus
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
USB Device: USB Bus
USB Device: USB Bus
USB Device: USB Bus
USB Device: USB 3.0 Bus
USB Device: OWC Express USB3.0
USB Device: OWC Mercury On-The-Go
USB Device: YAMAHA MOTIF XS8
USB Device: Hub
USB Device: Hub
USB Device: iLok
USB Device: eLicenser
USB Device: USB Axiom 61
Memory Module: DIMM 1, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D5948392020
Memory Module: DIMM 2, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D5948392020
Memory Module: DIMM 3, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D5948392020
Memory Module: DIMM 4, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D4348392020
Memory Module: DIMM 5, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D5948392020
Memory Module: DIMM 6, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D5948392020
Memory Module: DIMM 7, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D5948392020
Memory Module: DIMM 8, 8 GB, DDR3 ECC, 1333 MHz, 0x80CE, 0x4D33393342314B37304348302D4348392020
FireWire Device: built-in_hub, Up to 800 Mb/sec
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.106.98.102.31)
Network Service: Wi-Fi, AirPort, en2
PCI Card: pci2646,10, AHCI Controller, Slot-1
PCI Card: Radeon RX 580, Display Controller, Slot-2
PCI Card: pci1002,aaf0, Audio Device, Slot-2
PCI Card: PXS4, USB eXtensible Host Controller, Slot-4
Serial ATA Device: Kingston SHPM2280P2H/960G, 960.2 GB
Serial ATA Device: HL-DT-ST DVD-RW GH41N
Serial ATA Device: Hitachi HUA722020ALA330, 2 TB
Serial ATA Device: ST3300631AS, 300.07 GB
Serial ATA Device: SAMSUNG HD204UI, 2 TB
Serial ATA Device: HDS724040KLSA80, 400.09 GB