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Spanning store had some corner cases which showed up during rcu stress testing. Add explicit tests for those cases. At the same time add some locking for easier visibility of the rcu stress testing. Only a single dump of the tree will happen on the first detected issue instead of flooding the console with output. Link: https://lkml.kernel.org/r/20260130205935.2559335-13-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Alice Ryhl <aliceryhl@google.com> Cc: Andrew Ballance <andrewjballance@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christian Kujau <lists@nerdbynature.de> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: SeongJae Park <sj@kernel.org> Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>