Ticket #6010 (closed defect: fixed)
ACPI conflict with with Serial com port in debug windows guest
|Reported by:||ocean||Owned by:|
can't use windbg to do remote kernel debugging on a windows guest. adding the debug flag in boot.ini and using COM1 with a pipe.
starting windows normally doesn't give problems, com port haven't got any conflict. starting windows with kernel debug make COM port conflict with ACPI, that makes debugging impossible.
i've also found a way to make windows guest lock, it's something like that: adding a COM2 port connected to a pipe to vm and not adding it to devices in windows, then modify COM1 properties in windows guest to use COM2 configuration (base configuration 0002), then start the virtual machine and attach windbg which will say "waiting to reconnect" reboot windows guest in debug mode and windbg will succesfully attach but locks the guest.
in debug mode COM port used to debug conflicts with some ACPI device.
two logs are attached, one with guest in normal mode and COM port without conflict, the other one in debug mode with conflict.
sorry for my bad english.