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7b4f1a29c7
Add a test verifying that stacksafe() correctly handles 32-bit scalar spills when comparing stack states for equivalence during state pruning. A 32-bit scalar spill creates slot[0-3] = STACK_INVALID and slot[4-7] = STACK_SPILL. Without the im=4 check in stacksafe(), the STACK_SPILL vs STACK_MISC mismatch at byte 4 causes pruning to fail, forcing the verifier to re-explore a path that is provably safe. Acked-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20260323022410.75444-2-alexei.starovoitov@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>