Preview Build 18956

[Trouble]

today we’re releasing Windows 10 Insider Preview Build 18956 (20H1) to Windows Insiders in the Fast ring.

SOURCE: https://blogs.windows.com/windowsex...ider-preview-build-18956/#odHIioWKjgfCuFcJ.97

 

[Trouble]

Well that was fun.
First time ever that I've had an install into a virtual machine crash the host machine
I ended up with a Blue Screen on my primary machine hosting the Fast Ring VM

SYNTHETIC_WATCHDOG_TIMEOUT (1ca)
A system wide watchdog has expired. This indicates that the system
is hung and not processing timer ticks.
Arguments:
Arg1: 0000000014561928, The time since the watchdog was last reset, in interrupt time.
Arg2: 0000000835ae351d, The current interrupt time.
Arg3: 0000000835b142d1, The current QPC timestamp.
Arg4: 0000000000000003, The index of the clock processor.

After unwinding the stack I found multiple instances all pointing to the network stack referencing
tcpip, ndis and NETIO
But more specifically my vmswitch and Ipv4Global (Global just happens to be the name of my Virtual Switch in my Hyper-V setup).

fffff801`36fb2858 fffff801`4c3c2b68 vmswitch!`string'
fffff801`36fb2860 00000000`000000ff
fffff801`36fb2868 00000000`00000000
fffff801`36fb2870 00000000`00000001
fffff801`36fb2878 fffff801`3ceae6df ndis!NdisAcquireRWLockRead+0x2f
fffff801`36fb2880 00000000`00000002
fffff801`36fb2888 fffff801`4c22c003 vmswitch!VmsExtPtSendNetBufferListsCompleteFinal+0x1e3
fffff801`36fb2890 ffff9485`4b0efc80
fffff801`36fb2898 00000000`00000001
fffff801`36fb28a0 fffff801`3d0947e0 tcpip!WfpEnforceSilentDrop
fffff801`36fb28a8 fffff801`3cabb02c NETIO!ProcessCallout+0x6fc
fffff801`36fb28b0 00000000`00000002
fffff801`36fb28b8 00000000`0000000d
fffff801`36fb28c0 00000000`00000011
fffff801`36fb28c8 ffff9485`416edbb0
fffff801`36fb28d0 ffff9485`46a6da30
fffff801`36fb28d8 00000000`00000000
fffff801`36fb28e0 fffff801`36fb2b40
fffff801`36fb28e8 fffff801`4c22be0c vmswitch!VmsExtPtSendNetBufferListsComplete+0x1c
fffff801`36fb39a0 fffff801`3d21f2e0 tcpip!Ipv4Global
fffff801`36fb39a8 fffff801`3d091000 tcpip!RawReceiveDatagrams+0xc4
fffff801`36fb39b0 00000000`00000000
fffff801`36fb39b8 fffff801`3cead830 ndis!NdisReturnNetBufferLists+0x2d0
fffff801`36fb2858 fffff801`4c3c2b68 vmswitch!`string'
fffff801`36fb2860 00000000`000000ff
fffff801`36fb2868 00000000`00000000
fffff801`36fb2870 00000000`00000001
fffff801`36fb2878 fffff801`3ceae6df ndis!NdisAcquireRWLockRead+0x2f
fffff801`36fb2880 00000000`00000002
fffff801`36fb2888 fffff801`4c22c003 vmswitch!VmsExtPtSendNetBufferListsCompleteFinal+0x1e3
fffff801`36fb2890 ffff9485`4b0efc80
fffff801`36fb2898 00000000`00000001
fffff801`36fb28a0 fffff801`3d0947e0 tcpip!WfpEnforceSilentDrop
fffff801`36fb28a8 fffff801`3cabb02c NETIO!ProcessCallout+0x6fc
fffff801`36fb28b0 00000000`00000002
fffff801`36fb28b8 00000000`0000000d
fffff801`36fb28c0 00000000`00000011
fffff801`36fb28c8 ffff9485`416edbb0
fffff801`36fb28d0 ffff9485`46a6da30
fffff801`36fb28d8 00000000`00000000
fffff801`36fb28e0 fffff801`36fb2b40
fffff801`36fb28e8 fffff801`4c22be0c vmswitch!VmsExtPtSendNetBufferListsComplete+0x1c

After a hard reset with the power button and some interim fiddling about, I managed to get it installed without further incident.

 

[TedWilt]

Installed and works ok so far.