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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - msan false positive on std::set destructor"
href="https://bugs.llvm.org/show_bug.cgi?id=39378">39378</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>msan false positive on std::set destructor
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>7.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>skvadrik@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21024" name="attach_21024" title="full preprocessed file that triggers msan error">attachment 21024</a> <a href="attachment.cgi?id=21024&action=edit" title="full preprocessed file that triggers msan error">[details]</a></span>
full preprocessed file that triggers msan error
Consider the following harmless code:
$ cat a.cpp
#include <set>
int main()
{
std::set<int> s;
s.insert (0);
return 0;
}
Memory sanitizer emits an error on it:
$ clang++ -Wall -fsanitize=memory a.cpp -o a -g && ./a
==24666==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x494e6b in std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>,
std::allocator<int> >::_M_erase(std::_Rb_tree_node<int>*)
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/stl_tree.h:1870:7
#1 0x494eff in std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>,
std::allocator<int> >::_M_erase(std::_Rb_tree_node<int>*)
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/stl_tree.h:1872:4
#2 0x494c64 in std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>,
std::allocator<int> >::~_Rb_tree()
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/stl_tree.h:965:9
#3 0x494721 in std::set<int, std::less<int>, std::allocator<int> >::~set()
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/stl_set.h:281:22
#4 0x49445b in main /home/ulya/a.cpp:8:1
#5 0x7f7781dcef09 in __libc_start_main
/usr/src/debug/sys-libs/glibc-2.26-r7/glibc-2.26/csu/../csu/libc-start.c:308
#6 0x41b679 in _start (/home/ulya/a+0x41b679)
SUMMARY: MemorySanitizer: use-of-uninitialized-value
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/bits/stl_tree.h:1870:7 in
std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>,
std::allocator<int> >::_M_erase(std::_Rb_tree_node<int>*)
Exiting
I'm attaching the preprocessed version of the file (it triggers the same error)
with the inlined header for std::set (it comes from GCC, as the paths show).</pre>
</div>
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