Re: 64 bit gnumach KDB stack traces

Michael Kelly, le mar. 05 mai 2026 20:11:29 +0100, a ecrit:
> On 05/05/2026 20:04, Samuel Thibault wrote:
> > 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?

Ah, yes, in that case you can implement a libthread_db library that you
give to gdb so it knows how to switch between threads in gnumach.

Samuel