Messages in this thread | | | Date | Wed, 7 Dec 2005 09:33:55 +0100 | From | Ingo Molnar <> | Subject | Re: [RT] Race condition on bug output. |
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* Steven Rostedt <rostedt@goodmis.org> wrote:
> Hi Ingo, > > I found a race condition in my kernel which can also be found in > yours. When I trigger the printk in check_periodic_interval, > interrupts are turned on in release_console_sem. Unfortunately, this > can have an interrupt go off there (since they are turned back on > there) and the write_lock system_time_lock will be taken again, thus > producing a deadlock. > > I'm not sure if this is the best solution, but this was the easiest. > > Maybe the CONFIG_PARANOID_GENERIC_TIME should be added in the warnings > in init/main.c too? > > Since interrupts are kept off in the ktimer (hrtimer, whatever) in > printk, this does not affect those patches. This is a PREEMPT_RT only > problem.
thanks, applied.
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