Todd Lipcon created KUDU-2378:
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Summary: Crash due to unaligned loads when building with clang 6.0
Key: KUDU-2378
URL: https://issues.apache.org/jira/browse/KUDU-2378
Project: Kudu
Issue Type: Improvement
Affects Versions: 1.7.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
When I built the whole tree with clang 6.0, all_types-itest crashed due to an
illegal instruction. Looking at assembly, it appeared to be that clang had
generated a 'movaps' (aligned load) instruction for a
*reinterpret_cast<int128_t>() call loading into an xmm register. We aren't
careful with alignment about loading other integer types because unaligned
loads of int64s don't have a high penalty, but unaligned load of int128 causes
a crash.
This is likely to crash on other compilers too -- surprised we haven't seen it
yet.
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