Wireshark-dev: Re: [Wireshark-dev] Npcap 0.01 call for test about Windows loopback traffic capt
From: Tyson Key <[email protected]>
Date: Sun, 19 Jul 2015 16:41:39 +0100
Hi Yang,

Sorry for the late reply about the BSOD issue (especially in this thread), but here is my debugging information, from BlueScreenView;

Dump File         : 071115-33031-01.dmp
Crash Time        : 11/07/2015 08:56:46 pm
Bug Check String  : BAD_POOL_CALLER
Bug Check Code    : 0x000000c2
Parameter 1       : 00000000`00000007
Parameter 2       : 00000000`00001200
Parameter 3       : 00000000`0c000000
Parameter 4       : ffffe001`f29be558
Caused By Driver  : tcpip.sys
Caused By Address : tcpip.sys+1c2180
File Description  : TCP/IP Driver
Product Name      : Microsoft® Windows® Operating System
Company           : Microsoft Corporation
File Version      : 6.3.9600.16384 (winblue_rtm.130821-1623)
Processor         : x64
Crash Address     : ntoskrnl.exe+150ca0
Stack Address 1   : 
Stack Address 2   : 
Stack Address 3   : 
Computer Name     : 
Full Path         : C:\WINDOWS\Minidump\071115-33031-01.dmp
Processors Count  : 4
Major Version     : 15
Minor Version     : 9600
Dump File Size    : 281,456
Dump File Time    : 11/07/2015 08:57:50 pm

I don't know if they're related to NPCap, or WinPCap (since BSV seems to load the current executable/DLL images from disk, to resolve the vendor names; and the nature of npf.sys is that it's always RAM-resident, and loaded into the TCP/IP stack), but I also have MiniDumps with SYSTEM_SERVICE_EXCEPTION, and SYSTEM_THREAD_EXCEPTION_NOT_HANDLED errors.


2015-07-17 1:57 GMT+01:00 Yang Luo <[email protected]>:
Hi Tyson,

On Thu, Jul 16, 2015 at 6:10 PM, Tyson Key <[email protected]> wrote:
Hi Yang,

Come to think of it, I got exactly the same BSoD error as Jim (BAD_POOL_CALLER). 

About this BAD_POOL_CALLER BSOD, I think there may be some bugs in allocating pool memory. I have found this in MS: https://msdn.microsoft.com/en-us/library/windows/hardware/ff560185(v=vs.85).aspx. It needs the four parameters in your BSOD screen to check the detailed crash reason. It's good if you can provide it:) 

However, my configuration is different (I have a bunch of VMware interfaces, and an Atheros AR9485WB-EG WLAN adaptor, which is also semi-supported by Acrylic Wi-Fi - but BSoDs for a different reason (seems to be related to NDIS drivers, with that)), and multiple loopback adaptors were created on my machine (named "Microsoft KM-TEST Loopback Adaptor", instead of "NPCap Loopback", if memory serves correctly). 

If you run "NPFInstall.exe -il" one time, Npcap will install one adapter for you. This is why you have so many loopback adapters. You should run "NPFInstall.exe -ul" to uninstall the lastest loopback adapter. 
And it seems that Npcap's renaming adapter to "Npcap Loopback Adapter" code doesn't work on Win10 and with no obvious reason. I have reported this to Microsoft to see if there's a solution.

Bizarrely, even after uninstalling NPCap, and replacing it with WinPCap, these KM-TEST adaptors still persist across reboots:
埋め込み画像 1

I assume that these are a side-effect of manually installing the .ini file, after attempting to run the set-up tool ("npfinstall -r", "npfinstall -li", and then "npfinstall -i") via a batch script with Administrator privileges.

I also found that although I could see packets containing a MAC address with the mnemonic "LOOP", I could not capture any ICMP traffic, when trying to ping, or ::1 (using both Microsoft Network Monitor, and Wireshark - the latter of which would not detect any interfaces, after reinstalling NPCap a few times, before eventually replacing it with WinPCap, until I rebooted).

If you have installed multiple loopback adapters using  "NPFInstall.exe -il", Npcap will view only the last one as the real "Npcap Loopback Adapter", so in your picture, it is only "Ethernet 4" that can be recognized by Npcap as loopback adapter. In this adapter, you should be able to see the loopback traffic.

If I get time, I'm going to see if I can reproduce the BSoD, and try writing down the steps involved.

If you found another BSOD, perhaps you can take a picture of it, so I can get enough details about the causes and parameters about it.


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