Re: 64 bit gnumach KDB stack traces

On 05/05/2026 20:04, Samuel Thibault wrote:
> Hello,
>
> Michael Kelly, le mar. 05 mai 2026 19:43:40 +0100, a ecrit:
>> Might it be possible instead to make gdb "gnumach aware" somehow through use
>> of a gdb plugin or similar?
> Usually one rather makes gnumach gdb-aware, by adding a gdbserver, so
> gdb can inspect it at will.
>
> Note that qemu can do that for you, see the "GDB in QEMU" section of
> microkernel/mach/gnumach/debugging on the wiki.
I have done that on occasion but I'm rather thinking of the case where a 
gnumach thread is stuck awaiting an event which never happens. How can 
you switch context to that thread and view its stack and so on?
>> That would be realistic for virtual machines
>> using Qemu but perhaps not so much for real hardware using a serial port.
>> Are serial ports even available for real machines these days?
> On servers, often, otherwise it's USB dongles.
>
> For debugging kernels one usually uses virtual machines anyway.

Yes, perhaps that's true for all kernels.

Cheers,

Mike.