Unexpected Kernel mode Trap


Hello!
 I get an Unexpected Kernel Mode Trap when I try to use Steam. The application worked fine until today. Every time I launch the program and try to update my Library, my system crashes. I've tried unintalling/re-installing it but it still won't work.
I've uploaded the MINIDUMP and MEMORY files onto my Skydrive.
https://skydrive.live.com/redir?resid=4349129AFC2A74FF%21445

Please help!
Answer
Answer
Hi,

The attached DMP files are of the UNEXPECTED_KERNEL_MODE_TRAP (7f) bug check.

This bug check indicates that the Intel CPU generated a trap and the kernel failed to catch this trap.

BugCheck 7F, {8, fffff801c6a1ee70, ffffd00020fb1ff0, fffff800041c12d4}

The 1st parameter of the bug check is 0x00000008, or Double Fault, indicates that an exception occurs during a call to the handler for a prior exception. Typically, the two exceptions are handled serially. However, there are several exceptions that cannot be handled serially, and in this situation the processor signals a double fault. There are two common causes of a double fault:
  • A kernel stack overflow. This overflow occurs when a guard page is hit, and the kernel tries to push a trap frame. Because there is no stack left, a stack overflow results, causing the double fault.
  • A hardware problem.

If we take a look at the call stack (warning, it's large):


STACK_TEXT: 
fffff801`c6a1ed28 fffff801`c51e57e9 : 00000000`0000007f 00000000`00000008 fffff801`c6a1ee70 ffffd000`20fb1ff0 : nt!KeBugCheckEx
fffff801`c6a1ed30 fffff801`c51e38f4 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiBugCheckDispatch+0x69
fffff801`c6a1ee70 fffff800`041c12d4 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiDoubleFaultAbort+0xb4
ffffd000`20fb1ff0 fffff800`041c15e4 : ffffe000`014f8010 00000000`00000000 00000000`00000000 fffff800`041c12d9 : Ndu!NduHandleNblContextRemoved+0x25c
ffffd000`20fb2070 fffff800`011570be : 01cee554`d1681283 00000004`001a0048 00000000`00200000 00000000`00000000 : Ndu!NduNblNotifyCallback+0x160
ffffd000`20fb20b0 fffff800`00d8d0bb : ffffe000`014028b0 00000000`00000000 00000000`00000000 00000000`00000000 : fwpkclnt!FwppNetBufferListEventNotify+0xae
ffffd000`20fb2180 fffff800`00c6c011 : ffffe000`04f67151 ffffe000`014028b0 ffffe000`014028b0 00000000`00000001 : NETIO!WfpNblInfoCleanup+0x4b
ffffd000`20fb21c0 fffff800`00f2755c : ffffe000`01402a10 ffffe000`014028b0 00000000`00000000 00000000`00000001 : ndis!NdisFreeNetBufferList+0x111
ffffd000`20fb2240 fffff800`00d83501 : ffffe000`014028b0 ffffe000`014f8011 00000000`00000001 00000000`00000000 : tcpip!TcpSendDatagramsComplete+0xac
ffffd000`20fb2280 fffff800`01ccc9cf : ffffe000`014028b0 00000000`00000000 ffffe000`0085d7d8 00000000`00000001 : NETIO!NetioDereferenceNetBufferList+0xb1
ffffd000`20fb22f0 fffff800`00c6e1b5 : ffffd000`20fb2389 00000000`00000001 00000000`00000000 ffffe000`0085d860 : wanarp!WanNdisSendComplete+0x8f
ffffd000`20fb2320 fffff800`00c815c6 : ffffe000`04f8f1a0 ffffe000`014028b0 ffffd000`00000001 ffffd000`20fb2401 : ndis!ndisMSendCompleteNetBufferListsInternal+0x135
ffffd000`20fb23f0 fffff800`01acd31c : 00000000`00000001 00000000`00000000 ffffe000`00886e68 fffff800`00000000 : ndis!NdisFSendNetBufferListsComplete+0x12e86
ffffd000`20fb2520 fffff800`01acdad7 : ffffe000`0083c2b0 fffff800`01a30756 00000000`00000000 fffff800`01acd27f : cfosspeed6+0xad31c
ffffd000`20fb2550 fffff800`01ad2daf : ffffe000`0083c2b0 ffffe000`00000001 ffffe000`00886e40 fffff800`01acd5c4 : cfosspeed6+0xadad7
ffffd000`20fb2580 fffff800`01acff9b : ffffe000`0083c2b0 ffffe000`0085d790 ffffd000`20fb2658 00000000`00000000 : cfosspeed6+0xb2daf
ffffd000`20fb25d0 fffff800`00c6c81f : ffffe000`00871460 ffffe000`014028b0 00000000`00000000 00000000`00000001 : cfosspeed6+0xaff9b
ffffd000`20fb27a0 fffff800`01cd74a3 : ffffe000`04e39790 ffffe000`014028b0 ffffe000`00000000 ffffe000`03e39250 : ndis!NdisSendNetBufferLists+0x25f
ffffd000`20fb2980 fffff800`00f4a2c9 : ffffe000`024a7a60 ffffd000`20fb2d70 ffffe000`02324b98 ffffe000`02324b98 : wanarp!WanIpSendPackets+0x263
ffffd000`20fb2a80 fffff800`00f46c54 : fffff800`010a9180 00000000`00000000 ffffd000`20fb3010 00000000`00000020 : tcpip!IppFragmentPackets+0x699
ffffd000`20fb2bd0 fffff800`00f06475 : fffff800`010a9180 00000000`00000000 00000000`00000000 ffffe000`01402800 : tcpip!IppDispatchSendPacketHelper+0x94
ffffd000`20fb2d60 fffff800`00f45b02 : 00000000`00000000 00000000`00000002 ffffd000`20fb31c0 ffffe000`02324b98 : tcpip!IppPacketizeDatagrams+0x2d5
ffffd000`20fb2f00 fffff800`00f005f2 : ffffe000`01258840 fffff800`00d87307 fffff800`010a9180 ffffe000`01463d70 : tcpip!IppSendDatagramsCommon+0x4a2
ffffd000`20fb30e0 fffff800`00f0a3da : ffffe000`01402c04 ffffd000`20fb3220 ffffe000`014028b0 ffffe000`0121d4f0 : tcpip!IpNlpSendDatagrams+0x42
ffffd000`20fb3120 fffff800`00f5acd1 : 00000000`75b4acc7 ffffe000`002d7f40 00000000`c71ef001 00000000`000005a0 : tcpip!TcpTcbHeaderSend+0x53a
ffffd000`20fb33c0 fffff800`00f08644 : ffffe000`0142ddd0 00000000`00000000 ffffe000`0142dd02 00000000`00000001 : tcpip!TcpTcbCarefulDatagram+0x1341
ffffd000`20fb3770 fffff800`00f57007 : 00000000`00000000 ffffe000`00ac8122 c71ef067`75b4acc7 ffffe000`022016a0 : tcpip!TcpTcbReceive+0x314
ffffd000`20fb38c0 fffff800`00f07625 : ffffe000`00ac7122 ffffe000`0235f140 00000000`00000000 ffffe000`002d7f40 : tcpip!TcpMatchReceive+0x1e7
ffffd000`20fb3a50 fffff800`00f0b9bf : ffffe000`0231c470 ffffd000`20fb5000 ffffd000`20fb7e07 fffff801`c5027e07 : tcpip!TcpPreValidatedReceive+0x385
ffffd000`20fb3b50 fffff800`00f0bcc3 : ffffe000`007ea9c0 ffffe000`04433201 ffffe000`02b9dd40 fffff801`c50447c4 : tcpip!IppDeliverListToProtocol+0x4f
ffffd000`20fb3c10 fffff800`00f1c13c : ffffe000`02fb16a0 00000000`00000001 ffffd000`20fb3d40 ffffd000`20fb3d18 : tcpip!IppProcessDeliverList+0x63
ffffd000`20fb3cb0 fffff800`00f193da : ffffd000`20fb3dd8 ffffe000`04bab030 ffffe000`0235f000 fffff800`00f1b139 : tcpip!IppReceiveHeaderBatch+0x1fc
ffffd000`20fb3de0 fffff800`01ccc701 : ffffe000`00da6c10 00000000`00000000 ffffd000`20fb4201 fffff800`00000000 : tcpip!IppFlcReceivePacketsCore+0x68a
ffffd000`20fb4160 fffff800`00c69cde : ffffe000`04e39790 00000000`00000001 ffffe000`04bab030 00000000`00000001 : wanarp!WanNdisReceivePackets+0x351
ffffd000`20fb42a0 fffff800`00c78892 : ffffe000`02f99502 00000000`00000001 00000000`00000000 00000000`00000001 : ndis!ndisMIndicateNetBufferListsToOpen+0x11e
ffffd000`20fb4360 fffff800`00cbe037 : ffffe000`04f8f1a0 fffff800`01aba501 00000000`00000000 ffffe000`00ad6c48 : ndis!ndisMTopReceiveNetBufferLists+0x2c2
ffffd000`20fb43f0 fffff800`00c92bd0 : 00000000`00000000 00000000`00000000 ffffe000`04bab030 ffffe000`04bab030 : ndis!ndisInvokeNextReceiveHandler+0xb47
ffffd000`20fb4520 fffff800`00c78c0c : 0000002e`00000101 00000000`00000000 ffffe000`00ac7030 ffffe000`00000001 : ndis!ndisFilterIndicateReceiveNetBufferLists+0x1a270
ffffd000`20fb45c0 fffff800`01ad6d99 : 00000000`00000002 ffffd000`20fb4e70 ffffe000`008a2400 ffffd000`20fb4ab0 : ndis!NdisFIndicateReceiveNetBufferLists+0x4c
ffffd000`20fb4600 fffff800`01a6d3a7 : ffffe000`00871460 ffffe000`00ac7030 ffffe000`00000000 00000000`077e0050 : cfosspeed6+0xb6d99
ffffd000`20fb4670 fffff800`01b2ad4e : ffffe000`00884fc0 ffffe000`00ac7030 ffffe000`00ac76e0 ffffe000`009f5440 : cfosspeed6+0x4d3a7
ffffd000`20fb4730 fffff800`01b2aded : ffffe000`008b7b40 ffffe000`00ad6c10 ffffe000`00000000 ffffe000`00000028 : cfosspeed6+0x10ad4e
ffffd000`20fb47f0 fffff800`01b2c51c : ffffe000`008b7b40 ffffe000`009f5340 ffffe000`009f5450 ffffe000`009f5450 : cfosspeed6+0x10aded
ffffd000`20fb4840 fffff800`01b10b09 : ffffe000`008b7b40 ffffe000`009f5340 00000000`00000001 3fffffff`00003306 : cfosspeed6+0x10c51c
ffffd000`20fb4870 fffff800`01ae7423 : ffffe000`0086dce0 ffffe000`009f5340 ffffe000`00bebc20 ffffe000`008a1ad8 : cfosspeed6+0xf0b09
ffffd000`20fb48a0 fffff800`01ae7106 : ffffe000`008a1910 ffffe000`008a1948 ffffe000`009f5450 fffff800`01aeab63 : cfosspeed6+0xc7423
ffffd000`20fb4920 fffff800`01adf130 : ffffe000`008a1910 ffffe000`009f5340 ffffe000`009f5410 00000000`00000000 : cfosspeed6+0xc7106
ffffd000`20fb4960 fffff800`01a433a6 : ffffe000`008a1030 ffffe000`009f5340 ffffe000`009f5300 ffffd000`20fb4a00 : cfosspeed6+0xbf130
ffffd000`20fb4990 fffff800`01a43439 : ffffe000`00860470 ffffe000`009f5340 ffffd000`20fb4a88 fffff800`01a41960 : cfosspeed6+0x233a6
ffffd000`20fb49d0 fffff800`01b45375 : ffffe000`00860470 ffffe000`009f5340 ffffe000`009f5380 fffff800`01abcbaa : cfosspeed6+0x23439
ffffd000`20fb4a00 fffff800`01b45a43 : ffffd000`20fb4ab0 fffff800`01ad2d1e ffffd000`20fb4b20 fffff800`01ac7647 : cfosspeed6+0x125375
ffffd000`20fb4a30 fffff800`01b460a4 : ffffe000`009f5340 fffff800`01acf7c0 00000000`00000000 ffffe000`009f5340 : cfosspeed6+0x125a43
ffffd000`20fb4a90 fffff800`01ac1849 : fffff800`01bad634 ffffd000`20fb4d50 ffffe000`043c35e0 fffff800`01ab8743 : cfosspeed6+0x1260a4
ffffd000`20fb4af0 fffff800`01acfe21 : ffffe000`00886e40 ffffe000`009f5340 ffffd000`20fb4c28 00000000`00000000 : cfosspeed6+0xa1849
ffffd000`20fb4ba0 fffff800`00c6c81f : ffffe000`00871460 ffffe000`043c3480 00000000`00000000 00000000`00000001 : cfosspeed6+0xafe21
ffffd000`20fb4d70 fffff800`01cd74a3 : ffffe000`04e39790 ffffe000`043c3480 ffffe000`00000000 ffffe000`03e39250 : ndis!NdisSendNetBufferLists+0x25f
ffffd000`20fb4f50 fffff800`00f4a2c9 : ffffe000`024a7a60 ffffd000`20fb5340 ffffe000`02324a58 ffffe000`02324a58 : wanarp!WanIpSendPackets+0x263
ffffd000`20fb5050 fffff800`00f46c54 : fffff800`010a9180 00000000`00000000 ffffd000`20fb55d0 fffff801`00000014 : tcpip!IppFragmentPackets+0x699
ffffd000`20fb51a0 fffff800`00f06475 : fffff800`010a9180 00000000`00000000 00000000`00000000 ffffe000`043c3400 : tcpip!IppDispatchSendPacketHelper+0x94
ffffd000`20fb5330 fffff800`00f45b02 : ffffe000`0121d4f0 ffffe000`01258840 ffffd000`20fb5900 ffffe000`02324a58 : tcpip!IppPacketizeDatagrams+0x2d5
ffffd000`20fb54d0 fffff800`00f01a85 : ffffe000`01207c40 fffff800`00c6c107 fffff800`010a9180 ffffe000`01463d70 : tcpip!IppSendDatagramsCommon+0x4a2
ffffd000`20fb56b0 fffff800`00f0a565 : 00000000`00000000 00000000`00000001 00000000`00000000 fffff800`010a9180 : tcpip!IpNlpFastSendDatagram+0x101
ffffd000`20fb5790 fffff800`00f5b6ba : 00000000`000005a0 00000000`00000018 ffffe000`015bdbc0 ffffe000`0151b8f0 : tcpip!TcpTcbHeaderSend+0x6c5
ffffd000`20fb5a30 fffff800`00f08644 : ffffd000`20fb5f98 fffff800`01aecb7c ffffd000`20fb5fb0 fffff800`01b05383 : tcpip!TcpTcbCarefulDatagram+0x1d2b
ffffd000`20fb5de0 fffff800`00f57007 : 00000000`00000000 00000000`0000002b ffffd000`20fb5fe0 ffffe000`022016a0 : tcpip!TcpTcbReceive+0x314
ffffd000`20fb5f30 fffff800`00f07625 : ffffe000`0091c122 ffffe000`0235f000 00000000`00000000 ffffe000`002d7f40 : tcpip!TcpMatchReceive+0x1e7
ffffd000`20fb60c0 fffff800`00f0b9bf : ffffe000`0231c470 ffffd000`20fb5000 ffffd000`20fb7e07 ffffe000`00807e07 : tcpip!TcpPreValidatedReceive+0x385
ffffd000`20fb61c0 fffff800`00f0bcc3 : ffffe000`0091c0d8 ffffe000`00871460 00000000`00000001 fffff800`01ac76a8 : tcpip!IppDeliverListToProtocol+0x4f
ffffd000`20fb6280 fffff800`00f1c13c : ffffe000`00000000 ffffe000`00ad6c10 00000000`0000002e ffffd000`20fb6388 : tcpip!IppProcessDeliverList+0x63
ffffd000`20fb6320 fffff800`00f193da : 00000000`00000000 ffffe000`0142ddd0 ffffe000`0235f000 fffff800`047da351 : tcpip!IppReceiveHeaderBatch+0x1fc
ffffd000`20fb6450 fffff800`01ccc701 : ffffe000`00da6c10 00000000`00000000 ffffd000`20fb6801 fffff800`01bad500 : tcpip!IppFlcReceivePacketsCore+0x68a
ffffd000`20fb67d0 fffff800`00c69cde : ffffe000`04e39790 00000000`00000001 ffffe000`0142ddd0 00000000`00000001 : wanarp!WanNdisReceivePackets+0x351
ffffd000`20fb6910 fffff800`00c78892 : 00000000`00000002 00000000`00000001 00000000`00000000 00000000`00000001 : ndis!ndisMIndicateNetBufferListsToOpen+0x11e
ffffd000`20fb69d0 fffff800`00c6acd5 : ffffe000`04f8f1a0 ffffe000`00fbe501 00000000`00000000 00000000`00000001 : ndis!ndisMTopReceiveNetBufferLists+0x2c2
ffffd000`20fb6a60 fffff800`0462331d : ffffe000`00f05cb0 ffffe000`02f06030 ffffe000`023a3010 00000000`00009ca1 : ndis!NdisMIndicateReceiveNetBufferLists+0xba5


We can see various network routines being called, and then we hit cfosspeed6.sys being called over and over again. This is the cFosSpeed - The Internet Accelerator driver. It's more than likely causing NETBIOS conflicts, so please remove this software ASAP!


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If you're still crashing after removing cFosSpeed, remove and replace avast! with Windows 8's built-in Windows Defender for temporary troubleshooting purposes:

avast! removal tool - http://www.avast.com/uninstall-utility


Regards,


Patrick

Debugger/Reverse Engineer.

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Question Info


Last updated March 4, 2020 Views 960 Applies to: