If you build QEMU with the clang UB sanitizer and do a 'make check-tcg' run, it can fail like this:
TEST vma-pthread-with-libinsn.so on aarch64 ../../util/interval-tree.c:751:32: runtime error: member access within null pointer of type 'IntervalTreeNode' (aka 'struct IntervalTreeNode') SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../util/interval-tree.c:751:32 in SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../util/interval-tree.c:751:32 in make[1]: *** [Makefile:181: run-plugin-vma-pthread-with-libinsn.so] Error 124 make: *** [/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/tests/Makefile.include:56: run-tcg-tests-aarch64-linux-user] Error 2 I only saw this once; when I re-ran the test passed... thanks -- PMM
