OS X 10.6 EBUSY for zvol + zpool export

gistfile1.txt

Tue Dec 31 12:01:22 2013
panic(cpu 0 caller 0xffffff7f80c63c93): "Hello EBUSY zvol\n"@spa.c:4195
Backtrace (CPU 0), Frame : Return Address
0xffffff806069ba50 : 0xffffff8000204d15 _panic + 0x260
0xffffff806069bb50 : 0xffffff7f80c63c93 net.lundman.zfs + 425107 

0xffffff806069bbe0 : 0xffffff7f80c63e91 net.lundman.zfs + 425617 

0xffffff806069bc20 : 0xffffff7f80ca40f5 net.lundman.zfs + 688373 

0xffffff806069bc70 : 0xffffff7f80ca380c net.lundman.zfs + 686092 

0xffffff806069bcf0 : 0xffffff8000317b03 _spec_ioctl + 0x9c
0xffffff806069bd20 : 0xffffff800030dd67 _VNOP_IOCTL + 0xaa
0xffffff806069bd90 : 0xffffff800030ac87 _utf8_encodelen + 0x6bb
0xffffff806069be00 : 0xffffff8000471e21 _fo_ioctl + 0x53
0xffffff806069be30 : 0xffffff80004952e7 _ioctl + 0x4a1
0xffffff806069bf40 : 0xffffff80004e8168 _unix_syscall64 + 0x220
0xffffff806069bfa0 : 0xffffff80002e4874 _hndl_unix_scall64 + 0x14
      Kernel Extensions in backtrace (with dependencies):
         net.lundman.zfs(1.0.0)@0xffffff7f80bfc000->0xffffff7f80d6cfff
            dependency: com.apple.iokit.IOStorageFamily(1.6.3)@0xffffff7f80884000
            dependency: net.lundman.spl(1.0.0)@0xffffff7f80bf6000

BSD process name corresponding to current thread: zpool

Mac OS version:
10K549

Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun  7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64
System model name: MacBookPro10,1

System uptime in nanoseconds: 102599949423
unloaded kexts:
(none)
loaded kexts:
com.parallels.filesystems.prlufs	2010.12.28 - last loaded 13055066288
net.lundman.zfs	1.0.0
net.lundman.spl	1.0.0
com.parallels.kext.tg	9.0 24172.951362
com.parallels.kext.video	9.0 24172.951362
com.parallels.kext.mouse	9.0 24172.951362
org.tgwbd.driver.ACPIPS2Nub	1.0.0d1
com.apple.filesystems.autofs	2.1.0
com.apple.driver.AudioAUUC	1.57
com.apple.driver.AppleIntelAC97Audio	1.1.0
com.apple.Dont_Steal_Mac_OS_X	7.0.0
com.apple.driver.AppleTyMCEDriver	1.0.2d2
com.apple.iokit.CHUDUtils	364
com.apple.iokit.CHUDProf	366
com.apple.driver.AppleIntelPenrynProfile	76
com.apple.driver.AppleUpstreamUserClient	3.5.7
com.apple.driver.AppleIntelNehalemProfile	76
com.apple.driver.AppleMCCSControl	1.0.20
com.apple.driver.AudioIPCDriver	1.1.6
com.apple.driver.AppleIntelMeromProfile	76
com.apple.driver.ACPI_SMC_PlatformPlugin	4.7.0a1
com.apple.iokit.SCSITaskUserClient	2.6.8
com.apple.driver.ApplePS2Keyboard	1.3.0
com.apple.driver.AppleUSBHub	4.2.4
com.apple.driver.AppleIntelPIIXATA	2.5.1
com.apple.driver.AppleUSBEHCI	4.2.4
com.apple.driver.AppleHPET	1.5
com.apple.iokit.IOAHCIBlockStorage	1.6.4
com.apple.driver.AppleAHCIPort	2.1.7
com.apple.driver.AppleUSBUHCI	4.2.0
com.apple.driver.AppleIntel8254XEthernet	2.1.3b1
com.apple.driver.AppleEFINVRAM	1.4.0
com.apple.driver.AppleACPIButtons	1.3.6
com.apple.BootCache	31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib	1.0.0d1
com.apple.driver.AppleSmartBatteryManager	160.0.0
com.apple.driver.AppleACPIEC	1.3.6
com.apple.driver.AppleRTC	1.3.1
com.apple.driver.AppleSMBIOS	1.7
com.apple.driver.AppleIntelCPUPowerManagementClient	142.6.0
com.apple.driver.AppleAPIC	1.4
com.apple.security.sandbox	1
com.apple.security.quarantine	0
com.apple.nke.applicationfirewall	2.1.14
com.apple.driver.AppleIntelCPUPowerManagement	142.6.0
com.apple.driver.AppleProfileReadCounterAction	76
com.apple.driver.AppleProfileTimestampAction	76
com.apple.driver.AppleProfileThreadInfoAction	76
com.apple.driver.AppleProfileRegisterStateAction	76
com.apple.driver.AppleProfileKEventAction	76
com.apple.driver.AppleProfileCallstackAction	76
com.apple.iokit.IOSurface	74.2
com.apple.iokit.IOBluetoothSerialManager	2.4.5f3
com.apple.iokit.IOSerialFamily	10.0.3
com.apple.iokit.CHUDKernLib	365
com.apple.iokit.IOAudioFamily	1.8.3fc2
com.apple.kext.OSvKernDSPLib	1.3
com.apple.iokit.IONDRVSupport	2.2.1
com.apple.iokit.AppleProfileFamily	76
com.apple.driver.AppleSMC	3.1.0d5
com.apple.driver.IOPlatformPluginFamily	4.7.0a1
com.apple.driver.AppleIntelAC97Controller	1.1.0
com.apple.iokit.IOGraphicsFamily	2.2.1
com.apple.driver.AppleUSBHIDKeyboard	141.5
com.apple.iokit.IOUSBHIDDriver	4.2.0
com.apple.driver.AppleHIDKeyboard	141.5
com.apple.driver.AppleUSBComposite	3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice	2.6.8
com.apple.iokit.IOBDStorageFamily	1.6
com.apple.iokit.IODVDStorageFamily	1.6
com.apple.iokit.IOCDStorageFamily	1.6.1
com.apple.driver.ApplePS2Controller	1.3.0
com.apple.iokit.IOUSBUserClient	4.2.4
com.apple.iokit.IOATAFamily	2.5.1
com.apple.driver.XsanFilter	402.1
com.apple.iokit.IOAHCISerialATAPI	1.2.6
com.apple.iokit.IOSCSIArchitectureModelFamily	2.6.8
com.apple.iokit.IOAHCIFamily	2.0.6
com.apple.iokit.IOUSBFamily	4.2.4
com.apple.driver.AppleEFIRuntime	1.4.0
com.apple.iokit.IONetworkingFamily	1.10
com.apple.iokit.IOHIDFamily	1.6.6
com.apple.driver.AppleFileSystemDriver	2.0
com.apple.iokit.IOSMBusFamily	1.1
com.apple.security.TMSafetyNet	6
com.apple.kext.AppleMatch	1.0.0d1
com.apple.driver.DiskImages	289.1
com.apple.iokit.IOStorageFamily	1.6.3
com.apple.driver.AppleACPIPlatform	1.3.6
com.apple.iokit.IOPCIFamily	2.6.5
com.apple.iokit.IOACPIFamily	1.3.0