On Mon, Dec 29, 2025 at 11:16:15AM -0800, Paul E. McKenney wrote: > If an expedited RCU CPU stall ends just at the stall-warning timeout, > the current code will print an expedited stall-warning message, but one > that doesn't identify any CPUs or tasks causing the stall. This is most > likely to happen for short-timeout stalls, for example, the 20-millisecond > timeouts that are sometimes used for small embedded devices. Needless to > say, these semi-empty stall-warning messages can be rather confusing. > > One option would be to suppress the stall-warning message entirely in > this case, but the near-miss information can be quite valuable. > > This commit therefore detects this race condition and emits a "INFO:
s/This commit therefore detects this/Detect this/ > Expedited stall ended before state dump start" message to clarify matters. > > Reported-by: Borislav Petkov <[email protected]> > Signed-off-by: Paul E. McKenney <[email protected]> > --- > kernel/rcu/tree_exp.h | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) But yeah, makes sense. Acked-by: Borislav Petkov (AMD) <[email protected]> Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette
