el capitain crashes at startup, reloads, creates a crash report, and continues without crashing

thank you for the reply. The problem had gone away for a few days after I disconnected the USB devices I could do without, and I thought they may have been the cause. But without the usb devices, it crashed again when I turned the system on today: Here is the crash report:

Mon Mar 14 13:47:17 2016

*** Panic Report ***

panic(cpu 0 caller 0xffffff8002df076b): "soclose: NOFDREF"@/Library/Caches/com.apple.xbs/Sources/xnu/xnu-3248.30.4/bsd/kern/uipc_ socket.c:1263

Backtrace (CPU 0), Frame : Return Address

0xffffff83ad673970 : 0xffffff80028df792

0xffffff83ad6739f0 : 0xffffff8002df076b

0xffffff83ad673a40 : 0xffffff8002e17664

0xffffff83ad673a60 : 0xffffff7f8630e36c

0xffffff83ad673b50 : 0xffffff7f8630aeed

0xffffff83ad673c80 : 0xffffff8002d9600b

0xffffff83ad673cc0 : 0xffffff8002df27bc

0xffffff83ad673e30 : 0xffffff8002dcfcb6

0xffffff83ad673e60 : 0xffffff8002dc9787

0xffffff83ad673f00 : 0xffffff8002dc95be

0xffffff83ad673f60 : 0xffffff8002e2a731

0xffffff83ad673fb0 : 0xffffff80029f0a36

BSD process name corresponding to current thread: socketfilterfw

Mac OS version:

15D21

Kernel version:

Darwin Kernel Version 15.3.0: Thu Dec 10 18:40:58 PST 2015; root:xnu-3248.30.4~1/RELEASE_X86_64

Kernel UUID: DECC9F02-27D7-31F0-9599-A9EF2873902C

Kernel text base: 0xffffff8002800000

__HIB text base: 0xffffff8002700000

System model name: iMac15,1 (Mac-FA842E06C61E91C5)

System uptime in nanoseconds: 84005855038

last loaded kext at 6197833658: com.apple.driver.AppleBluetoothHIDKeyboard 181 (addr 0xffffff7f84f18000, size 16384)

loaded kexts:

com.parallels.virtualhid 1.0.3 3

com.paragon-software.filesystems.ntfs 187.1.14

com.parallels.virtualsound 1.0.36 36

com.apple.driver.AudioAUUC 1.70

com.apple.driver.AppleBluetoothMultitouch 90.3

com.apple.filesystems.autofs 3.0

com.apple.driver.ApplePlatformEnabler 2.6.0d0

com.apple.driver.AGPM 110.20.22

com.apple.driver.X86PlatformShim 1.0.0

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleMikeyDriver 272.51.3

com.apple.driver.AppleHDAHardwareConfigDriver 272.51.3

com.apple.driver.AppleHDA 272.51.3

com.apple.driver.AppleGraphicsDevicePolicy 3.7.7

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.kext.AMDFramebuffer 1.4.0

com.apple.driver.pmtelemetry 1

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.driver.AppleThunderboltIP 3.0.8

com.apple.driver.AppleMuxControl 3.12.6

com.apple.AMDRadeonX4000 1.4.0

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.iokit.IOBluetoothSerialManager 4.4.3f4

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleFIVRDriver 4.1.0

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.3f4

com.apple.driver.AppleBacklight 170.8.8

com.apple.driver.AppleLPC 3.1

com.apple.driver.AppleSMCLMU 208

com.apple.kext.AMD9000Controller 1.4.0

com.apple.driver.AppleHV 1

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AppleIntelHD5000Graphics 10.1.2

com.apple.driver.AppleIntelFramebufferAzul 10.1.2

com.apple.driver.AppleMCCSControl 1.2.13

com.apple.iokit.IOBluetoothUSBDFU 4.4.3f4

com.apple.driver.CoreStorageFsck 517.20.1

com.apple.driver.AppleFileSystemDriver 3.0.1

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.BootCache 38

com.apple.iokit.IOAHCIBlockStorage 2.8.5

com.apple.driver.AppleSDXC 1.7.0

com.apple.iokit.AppleBCM5701Ethernet 10.1.12

com.apple.driver.AirPort.Brcm4360 1020.17.1a1

com.apple.driver.AppleAHCIPort 3.1.8

com.apple.driver.AppleACPIButtons 4.0

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 4.0

com.apple.driver.AppleAPIC 1.7

com.apple.nke.applicationfirewall 163

com.apple.security.quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.driver.AppleBluetoothHIDKeyboard 181

com.apple.driver.AppleHIDKeyboard 181

com.apple.driver.IOBluetoothHIDDriver 4.4.3f4

com.apple.driver.AppleMultitouchDriver 304.10

com.apple.driver.AppleHIDTransport 5

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 272.51.3

com.apple.kext.OSvKernDSPLib 525

com.apple.driver.AppleGraphicsControl 3.12.6

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.iokit.IOSerialFamily 11

com.apple.driver.CoreCaptureResponder 1

com.apple.driver.X86PlatformPlugin 1.0.0

com.apple.driver.AppleThunderboltEDMSink 4.1.1

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.3f4

com.apple.iokit.IOBluetoothFamily 4.4.3f4

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.driver.AppleHDAController 272.51.3

com.apple.iokit.IOHDAFamily 272.51.3

com.apple.iokit.IOAudioFamily 204.3

com.apple.vecLib.kext 1.2.0

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.driver.IOPlatformPluginFamily 6.0.0d7

com.apple.kext.AMDSupport 1.4.0

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.iokit.IOSurface 108.0.1

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.AppleGraphicsDeviceControl 3.12.6

com.apple.iokit.IOAcceleratorFamily2 205.1

com.apple.driver.AppleSMC 3.1.9

com.apple.driver.AppleSMBusController 1.0.14d1

com.apple.iokit.IOGraphicsFamily 2.4.1

com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7

com.apple.driver.usb.IOUSBHostHIDDevice 1.0.1

com.apple.driver.usb.AppleUSBHub 1.0.1

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1

com.apple.driver.CoreStorage 517.20.1

com.apple.driver.AppleUSBMergeNub 900.4.1

com.apple.driver.AppleThunderboltDPInAdapter 4.1.3

com.apple.driver.AppleThunderboltDPOutAdapter 4.1.3

com.apple.driver.AppleThunderboltDPAdapterFamily 4.1.3

com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2

com.apple.driver.AppleXsanScheme 3

com.apple.driver.AppleThunderboltNHI 4.0.4

com.apple.iokit.IOThunderboltFamily 5.1.0

com.apple.iokit.IOEthernetAVBController 1.0.3b3

com.apple.iokit.IO80211Family 1110.26

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IONetworkingFamily 3.2

com.apple.driver.corecapture 1.0.4

com.apple.iokit.IOAHCIFamily 2.8.1

com.apple.driver.usb.AppleUSBXHCIPCI 1.0.1

com.apple.driver.usb.AppleUSBXHCI 1.0.1

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.iokit.IOUSBHostFamily 1.0.1

com.apple.driver.AppleUSBHostMergeProperties 1.0.1

com.apple.driver.AppleEFINVRAM 2.0

com.apple.driver.AppleEFIRuntime 2.0

com.apple.iokit.IOHIDFamily 2.0.0

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 300.0

com.apple.kext.AppleMatch 1.0.0d1

com.apple.driver.AppleKeyStore 2

com.apple.driver.AppleMobileFileIntegrity 1.0.5

com.apple.driver.AppleCredentialManager 1.0

com.apple.driver.DiskImages 417.2

com.apple.iokit.IOStorageFamily 2.1

com.apple.iokit.IOReportFamily 31

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleACPIPlatform 4.0

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

Model: iMac15,1, BootROM IM151.0207.B05, 4 processors, Intel Core i7, 4 GHz, 32 GB, SMC 2.23f11

Graphics: AMD Radeon R9 M295X, AMD Radeon R9 M295X, PCIe, 4096 MB

Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x0198, 0x393955353432382D3031382E4130304C4620

Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x0198, 0x393930353432382D3038372E4130304C4620

Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1600 MHz, 0x0198, 0x393955353432382D3031382E4130304C4620

Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1600 MHz, 0x0198, 0x393955353432382D3031382E4130304C4620

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x142), Broadcom BCM43xx 1.0 (7.21.94.136.1a1)

Bluetooth: Version 4.4.3f4 16616, 3 services, 27 devices, 1 incoming serial ports

Network Service: Ethernet, Ethernet, en0

Serial ATA Device: APPLE SSD SM1024F, 1 TB

USB Device: USB 3.0 Bus

USB Device: BRCM20702 Hub

USB Device: Bluetooth USB Host Controller

USB Device: FaceTime HD Camera (Built-in)

USB Device: HP LaserJet 1200

Thunderbolt Bus: iMac, Apple Inc., 26.1

------------------------

I can try what you suggest, but would not want to run for long without the firewall... I'll try to reboot a few times now without the net connected. I'll give you an update...

Thank you Linc for the very informative response. Not exactly what I expected to hear though. Since I have an iMAC that does not move into cafe environments, it sounds like turning 'ON' the firewall would not buy me much, and if it is the cause of the system crashes, I conclude that I should just shut it 'OFF'

Is there another firewall I can add that would improve the security of the system, or should I spend time to configure the firewall on my home router?

Is there a data-base of known bugs for 10.11.3 that customers can search, or do I need to be a developer to do this?

Thankyou again for spending the time to discuss this with me.

Donald

There must be a discussion board for developers as well... Any idea?

thanks again.

thank you for your kind response. Parallels is up to date for version 9, but they have changed their price structure now, asking for $49 US every year to go ongoing updates. I don't use it that much to pay that right now. started to scan the error logs and found that a product called airserver was causing lots of errors, so I removed this one.

Because it is intermittent, not sure yet if it is fixed. I have not crashed for a few days, so I'll turn the firewall back on and see if it begins again.

cheers

Just to close off this problem, once I turned the OSX firewal back 'on' and turned on the system the next day, it crashed again.

so I conclude that many of you were correct to say it is caused by the apple firewall.

I found this tech note from apple:

OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem." - Apple Supp…

Thanks for the feedback everyone!