On Thu, Jan 03, 2013 at 08:21:31AM -0500, Steven Rostedt wrote:
> Anytime you have something that does the following in order to break
> lock ordering:
>
> repeat:
> lock(A);
> <do something>
> if (!trylock(B)) {
> unlock(A);
> cpu_relax();
> goto repeat;
> }
>
>
> We can live lock, because spinlocks in -rt turn into a mutex. Thus, the
> holder of lock B may not be on another CPU but actually on the current
> CPU and is waiting for the process that is in this loop. If that process
> happens to be an RT task, then the system stops.
Good point, but I'm prety sure we don't have any kind of trylock loops
in either fs/ext4 or fs/jbd2, though.
- Ted
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