id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	field_blocks	field_dependson	field_seealso
604	System sometimes appears wedged under msim	Jakub Jermář	Martin Decky	"The latest mainline (r2266) HelenOS/mips32/msim will appear hung, especially after a longer period of inactivity or when we change focus of the terminal window, but a closer look will reveal that it is only the keyboard input that for some reason does not pass through as it should.

You can try to boot (try to give the system 64M instead of 32M), then let HelenOS rest for some time and see if it appears hung (does not react to keyboard input). If it is still alive, try issuing a couple of commands and switch to some other window on your desktop and then back to the terminal window with msim.

If you indeed manage to hang the system, you will be able to set a breakpoint on exc_dispatch() and see that the kernel is still ticking, only the keyboard interrupts are not processed for some reason.

When the system appears hung, the kernel is executing the WAIT instruction in `scheduler_separated_stack()`, which suggests waiting for an interrupt event."	defect	closed	major	0.7.0	helenos/kernel/mips32	mainline	notadefect	msim, keyboard