On Wed, Nov 19, 2025 at 02:54:30AM +0000, Emmanuel Dreyfus wrote: > On Qemu: > - boot -a sometime hang on a prompt. There is a race somewhere, > I suspect it does not happen on real hardware because Qemu > serial emulation is much faster than a real serial port.
I finally got a console hang on real hardware. Only the output was concerned, I have been able to crash the machine by blindly typing the cnmagic sequence. So there is a real race, something rare enough to be tough to debug. The only hope is that it is the same bug as I observed with boot -a in Qemu, where it can be easily reproduced. Nick, you never explained me what was wrong with my initial version with an lwp in charge of deferred console output. It did not hang on boot -a, that seems to be an attractive feature. -- Emmanuel Dreyfus [email protected]
