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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - unsigned integer overflow in murmur2_or_cityhash<_Size, 64>::__hash_len_17_to_32"
href="https://llvm.org/bugs/show_bug.cgi?id=31131">31131</a>
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<th>Summary</th>
<td>unsigned integer overflow in murmur2_or_cityhash<_Size, 64>::__hash_len_17_to_32
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>gonzalobg88@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>I am hitting a
include/c++/v1/memory:3139:46: runtime error: unsigned integer overflow:
8751185004910830951 * 13011662864482103923 cannot be represented in type
'unsigned long'
SUMMARY: AddressSanitizer: undefined-behavior include/c++/v1/memory:3139:46 in
The function seems to be:
__murmur2_or_cityhash<_Size, 64>::__hash_len_17_to_32(const char *__s, _Size
__len).
Since it is a hash function, I would guess that the unsigned integer overflow
is intentional, and the signature is missing the:
_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
annotation.</pre>
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