Head does this on 2nd boot. Qemu 0.11.1
(ntoskrnl/kd/kdio.c:322) ReactOS 0.4-SVN (Build 20110818-r53292) <Snip> (base/services/umpnpmgr/umpnpmgr.c:2943) Device enumerated: ACPI\PNP0303\2&ccb86d17&0000 (ntoskrnl/io/pnpmgr/pnpmgr.c:2051) ACPI\ThermalZone\2&ccb86d17&0000 is using parent bus driver (acpi) (ntoskrnl/io/pnpmgr/pnpmgr.c:2051) ACPI\Processor\2&ccb86d17&0000 is using parent bus driver (acpi) (ntoskrnl/io/pnpmgr/pnpmgr.c:2051) ACPI\FixedButton\2&ccb86d17&0000 is using parent bus driver (acpi) (ntoskrnl/io/pnpmgr/pnpmgr.c:3609) IRP_MN_QUERY_PNP_DEVICE_STATE failed with status 0xc00000bb (ntoskrnl/io/pnpmgr/pnpmgr.c:3609) IRP_MN_QUERY_PNP_DEVICE_STATE failed with status 0xc00000bb (ntoskrnl/io/pnpmgr/pnpmgr.c:3609) IRP_MN_QUERY_PNP_DEVICE_STATE failed with status 0xc00000bb (base/services/umpnpmgr/umpnpmgr.c:2943) Device enumerated: ACPI\PNP0B00\2&ccb86d17&0000 (base/services/umpnpmgr/umpnpmgr.c:2943) Device enumerated: ACPI\PNP0A03\0 (base/services/umpnpmgr/umpnpmgr.c:2943) Device enumerated: ACPI\Processor\2&ccb86d17&0000 (base/services/umpnpmgr/umpnpmgr.c:2943) Device enumerated: ACPI\FixedButton\2&ccb86d17&0000 WARNING: LdrUnloadAlternateResourceModule at dll/ntdll/ldr/ldrapi.c:1546 is UNIMPLEMENTED! Assertion 'GuardedMutex->Owner != Thread' failed at ntoskrnl/include/internal/ke_x.h line 1596 Entered debugger on embedded INT3 at 0x0008:0x8090375e. kdb:> bt Eip: <ntoskrnl.exe:10375f (lib/rtl/i386/debug_asm.S:32 (DbgBreakPoint))> Frames: <ntoskrnl.exe:c2d89 (ntoskrnl/include/internal/ke_x.h:1596 (MmNotPresentFault@12))> <ntoskrnl.exe:c39d0 (ntoskrnl/mm/mmfault.c:275 (MmAccessFault@16))> <ntoskrnl.exe:6b42 (ntoskrnl/ke/i386/traphdlr.c:1232 (@KiTrap0EHandler@4))> <ntoskrnl.exe:fda74 (ntoskrnl/ke/i386/trap.s:0 (KiTrap0E))> <ntoskrnl.exe:c6267 (ntoskrnl/mm/rmap.c:305 (MmInsertRmap@12))> <ntoskrnl.exe:d03cc (ntoskrnl/mm/section.c:1795 (MmNotPresentFaultSectionView@16))> <ntoskrnl.exe:c308e (ntoskrnl/mm/mmfault.c:180 (MmNotPresentFault@12))> <ntoskrnl.exe:c39d0 (ntoskrnl/mm/mmfault.c:275 (MmAccessFault@16))> <ntoskrnl.exe:6b42 (ntoskrnl/ke/i386/traphdlr.c:1232 (@KiTrap0EHandler@4))> <ntoskrnl.exe:fda74 (ntoskrnl/ke/i386/trap.s:0 (KiTrap0E))> rpcrt4.dll:23a48 ntdll.dll:73b8 ntdll.dll:427f kernel32.dll:9cca msvcrt.dll:c357 msvcrt.dll:c381 rundll32.exe:1cac rundll32.exe:1cf8 kernel32.dll:c5ca --- Press q to abort, any other key to continue --- <00000000> kdb:>
After second retry, it installed, reboot and running tests.