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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MemorySanitizer use-of-uninitialized-value in Archive/directory.ll"
href="http://llvm.org/bugs/show_bug.cgi?id=16389">16389</a>
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<th>Summary</th>
<td>MemorySanitizer use-of-uninitialized-value in Archive/directory.ll
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Support Libraries
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>eugeni.stepanov@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Something in commit range 184416 - 184424 triggered a MemorySanitizer report on
Archive/directory.ll test:
WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x7fa48da88e6d in llvm::sys::fs::identify_magic(llvm::StringRef)
lib/Support/PathV2.cpp:785
#1 0x7fa48da8cb35 in llvm::sys::fs::identify_magic(llvm::Twine const&,
llvm::sys::fs::file_magic&) lib/Support/PathV2.cpp:903
#2 0x7fa48c90437a in llvm::Archive::addFileBefore(llvm::StringRef,
llvm::ilist_iterator<llvm::ArchiveMember>, std::string*)
tools/llvm-ar/ArchiveWriter.cpp:180
#3 0x7fa48c899309 in doReplaceOrInsert(std::string*)
tools/llvm-ar/llvm-ar.cpp:624
#4 0x7fa48c89bd8a in main tools/llvm-ar/llvm-ar.cpp:693
#5 0x7fa48af2e76c (/lib/x86_64-linux-gnu/libc.so.6+0x2176c)
#6 0x7fa48c884400 in _start (bin/llvm-ar+0x47400)
Uninitialized value was created by an allocation of 'Magic' in the stack
frame of function 'llvm::sys::fs::identify_magic(llvm::Twine const&,
llvm::sys::fs::file_magic&)'
Code in get_magic() looks weird in several places and does not seem to be
handling empty files well.</pre>
</div>
</p>
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