doc: Timer problems can cause RCU CPU stall warnings (b81898e3) · Commits · 戴 / test

Over the past few years, there have been several cases where timekeeping bugs have caused RCU CPU stall warnings, particularly during hardware bringup. This commit therefore adds such bugs to the list of things that can result in RCU CPU stall warnings. Signed-off-by:

Paul E. McKenney <paulmck@kernel.org>

Documentation/RCU/stallwarn.rst

+7 −0

Original line number	Diff line number	Diff line
		@@ -87,6 +87,13 @@ warnings:
		problem really has happened, and seems to be most likely to
		result in RCU CPU stall warnings for CONFIG_NO_HZ_COMMON=n kernels.

		- A hardware or software issue that prevents time-based wakeups
		from occurring. These issues can range from misconfigured or
		buggy timer hardware through bugs in the interrupt or exception
		path (whether hardware, firmware, or software) through bugs
		in Linux's timer subsystem through bugs in the scheduler, and,
		yes, even including bugs in RCU itself.

		- A bug in the RCU implementation.

		- A hardware failure. This is quite unlikely, but has occurred

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