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doc: Timer problems can cause RCU CPU stall warnings

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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>
This commit is contained in:
Paul E. McKenney 2020-04-30 12:23:11 -07:00
parent 2d9c318bfd
commit b81898e3d2
1 changed files with 7 additions and 0 deletions
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7
Documentation/RCU/stallwarn.rst
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@ -87,6 +87,13 @@ warnings:
problem really has happened, and seems to be most likely to problem really has happened, and seems to be most likely to
result in RCU CPU stall warnings for CONFIG_NO_HZ_COMMON=n kernels. 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 bug in the RCU implementation.
- A hardware failure. This is quite unlikely, but has occurred - A hardware failure. This is quite unlikely, but has occurred