datapath-windows: Avoid BSOD when no event queue found.
kd> ??instance
struct _OVS_OPEN_INSTANCE * 0xffffe000`
037f2880
+0x000 cookie : 1
+0x008 fileObject : 0xffffe000`
02c59f20 _FILE_OBJECT
+0x010 eventQueue : (null)
+0x018 packetQueue : 0xffffe000`
02d50100 _OVS_USER_PACKET_QUEUE
+0x020 pid : 2
+0x024 inUse : 0n1
+0x028 dumpState : <unnamed-tag>
+0x038 pidLink : _LIST_ENTRY [ 0xffffe000`
03ad83f0 - 0xffffe000`
03ad83f0 ]
kd> k
Child-SP RetAddr Call Site
ffffd000`
2876eb18 fffff801`
f364b7c6 nt!DbgBreakPointWithStatus
ffffd000`
2876eb20 fffff801`
f364b0d7 nt!KiBugCheckDebugBreak+0x12
ffffd000`
2876eb80 fffff801`
f35c21a4 nt!KeBugCheck2+0x8ab
ffffd000`
2876f290 fffff801`
f35cdbe9 nt!KeBugCheckEx+0x104
ffffd000`
2876f2d0 fffff801`
f35cc43a nt!KiBugCheckDispatch+0x69
ffffd000`
2876f410 fffff800`
02626666 nt!KiPageFault+0x23a
ffffd000`
2876f5a0 fffff800`
026318d7 OVSExt!OvsWaitEventIoctl+0x116 [c:\work\ovs\datapath-windows\ovsext\event.c @ 472]
ffffd000`
2876f610 fffff800`
026339b4 OVSExt!OvsPendEventCmdHandler+0x57 [c:\work\ovs\datapath-windows\ovsext\datapath.c @ 1056]
ffffd000`
2876f660 fffff800`
0264d9c5 OVSExt!InvokeNetlinkCmdHandler+0xf4 [c:\work\ovs\datapath-windows\ovsext\datapath.c @ 938]
ffffd000`
2876f6b0 fffff800`
006f1c18 OVSExt!OvsDeviceControl+0x855 [c:\work\ovs\datapath-windows\ovsext\datapath.c @ 853]
ffffd000`
2876f840 fffff801`
f383c395 NDIS!ndisDummyIrpHandler+0x88
ffffd000`
2876f870 fffff801`
f383cd2a nt!IopXxxControlFile+0x845
ffffd000`
2876fa20 fffff801`
f35cd8b3 nt!NtDeviceIoControlFile+0x56
ffffd000`
2876fa90 00000000`
775c2772 nt!KiSystemServiceCopyEnd+0x13
00000000`
010feef8 00000000`
775c2371 wow64cpu!CpupSyscallStub+0x2
00000000`
010fef00 00000000`
7765323a wow64cpu!DeviceIoctlFileFault+0x31
00000000`
010fefb0 00000000`
7765317e wow64!RunCpuSimulation+0xa
00000000`
010ff000 00007ff8`
f1076bd0 wow64!Wow64LdrpInitialize+0x172
00000000`
010ff540 00007ff8`
f1076aa6 ntdll!_LdrpInitialize+0xd8
00000000`
010ff5b0 00000000`
00000000 ntdll!LdrInitializeThunk+0xe
kd> ??poll
struct _OVS_EVENT_POLL * 0xffffd000`
2876f640
+0x000 cookie : 0x3a9ae28
+0x004 dpNo : 0
SYMBOL_STACK_INDEX: 6
SYMBOL_NAME: OVSExt!OvsWaitEventIoctl+116
FOLLOWUP_NAME: MachineOwner
MODULE_NAME: OVSExt
IMAGE_NAME: OVSExt.sys
DEBUG_FLR_IMAGE_TIMESTAMP:
54498bc5
BUCKET_ID_FUNC_OFFSET: 116
FAILURE_BUCKET_ID: AV_OVSExt!OvsWaitEventIoctl
BUCKET_ID: AV_OVSExt!OvsWaitEventIoctl
ANALYSIS_SOURCE: KM
FAILURE_ID_HASH_STRING: km:av_ovsext!ovswaiteventioctl
FAILURE_ID_HASH: {
07550bfb-c3b5-0412-b95d-
f89a5c4671a9}
Signed-off-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Sorin Vinturis <svinturis@cloudbasesolutions.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>