test: fix DebugSymbolsTest.ReqWrapList on PPC64LE #44341
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hmm I ran an LTO build with this and while the PPC64LE failure is gone, the same test now fails on s390x (where it wasn't before |
Currently, DebugSymbolsTest.ReqWrapList fails on PPC64LE when Node has been configured with Link Time Optimization (LTO) and using RHEL 8.5 and gcc: ```console $ . /opt/rh/gcc-toolset-11/enable $ export CC='ccache gcc' $ export CXX='ccache g++' $ ./configure --enable-lto $ make -j8 cctest ... 21:52:27 [ RUN ] DebugSymbolsTest.ReqWrapList 21:52:27 ../test/cctest/test_node_postmortem_metadata.cc:203: Failure 21:52:27 Expected equality of these values: 21:52:27 expected 21:52:27 Which is: 140736537072320 21:52:27 calculated 21:52:27 Which is: 1099680328560 21:52:27 [ FAILED ] DebugSymbolsTest.ReqWrapList (43 ms) ``` After looking into this is seems that the compiler is tampering with the `last` variable when compiling with LTO enabled. This commit suggests adding volatile to this variable to prevent the compiler from tampering with it.
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Re-run of failing LTO builds: https://ci.nodejs.org/job/node-test-commit-linux-lto/30/ |
richardlau
approved these changes
Aug 24, 2022
This was referenced Aug 24, 2022
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Currently, DebugSymbolsTest.ReqWrapList fails on PPC64LE when Node has
been configured with Link Time Optimization (LTO) and using RHEL 8.5
and gcc:
After looking into this is seems that the compiler is tampering with one
or more of the
queue,head,tail, andlastvariables whencompiling with LTO enabled. This commit suggests adding volatile to
these variables to prevent the compiler from tampering with them.
Some additional details can be found in these notes.