Frequent "(ntoskrnl/mm/mmfault.c:122) Page fault at high IRQL was 2, address NNN", followed by "last-chance exception (Exception Code: 0xc0000006) (Unknown/User defined exception)", on testbots

...

msg_queue: 2 tests executed (0 marked as todo, 0 failures), 0 skipped.

(ntoskrnl/mm/mmfault.c:122) Page fault at high IRQL was 2, address 20b0

Entered debugger on last-chance exception (Exception Code: 0xc0000006) (Unknown/User defined exception)

kdb:>

 bt

Eip:

<NTOSKRNL.EXE:94a50 (/srv/buildbot/work/output-MinGW-i386/sdk/include/ddk/wdm.h:10533 (KeWaitForMultipleObjects))>

Frames:

<win32k.sys:5e4e1 (win32ss/user/ntuser/msgqueue.c:1242 (co_MsqSendMessage))>

<win32k.sys:54079 (win32ss/user/ntuser/message.c:1452 (co_IntSendMessageTimeoutSingle))>

<win32k.sys:5453b (win32ss/user/ntuser/message.c:1507 (co_IntSendMessageTimeout))>

<win32k.sys:548a4 (win32ss/user/ntuser/message.c:1853 (co_IntDoSendMessage))>

<win32k.sys:56ea1 (win32ss/user/ntuser/message.c:2769 (NtUserMessageCall))>

<NTOSKRNL.EXE:130c4e (ntoskrnl/include/internal/i386/ke.h:712 (KiSystemServiceHandler))>

<NTOSKRNL.EXE:3da9 (:0 (KiFastCallEntry))>

<ntdll.dll:d485>

<explorer.exe:20dc6>

<explorer.exe:1ff4b>

<explorer.exe:23227>

<explorer.exe:2845a>

<user32.dll:61699>

<user32.dll:5574b>

<user32.dll:55b94>

<user32.dll:562c1>

<explorer.exe:9be6>

<explorer.exe:156e>

<explorer.exe:16bc>

<explorer.exe:14b38>

<explorer.exe:13c04>

<explorer.exe:13c4d>

<kernel32.dll:10952>

<00000000>

...

[SYSREG] Rebooting machine (retry 1)