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Initially, EXPECT_BUG was implemented with a if (!setjmp) which was semantically incorrect for the setjmp construct and caused a MISRA violation. Upon fixing the MISRA violation, it was changed to if (setjmp != 0) which fixed the MISRA violation but made the test code to never actually run because setjmp will first return 0 during the init of the jump point. This caused EXPECT_BUG to always return true as if a BUG() occurred. In addition, setjmp is relying internally on CPU registers. As a result, local variables may get clobbered. This mainly happens when compiler optimizations are enabled (release builds) and the compiler relies more on registers to hold local variables. In the case of the EXPECT_BUG statement expression, the variable holding the return value was incorrectly getting clobbered in some corner cases leading to false negatives. The easy workaround for this is to declare it as volatile, which prevents the compiler from only relying on registers for this variable. JIRA NVGPU-3562 Change-Id: Ie5e262d630bdd38b22449347a396d4c2cdd3bbe2 Signed-off-by: Nicolas Benech <nbenech@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/2126872 Reviewed-by: Thomas Fleury <tfleury@nvidia.com> Reviewed-by: Philip Elcan <pelcan@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Alex Waterman <alexw@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>