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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [11.1.0, 12.0.0] AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x000000000000 bp 0x7ffdc47fa0b0 sp 0x7ffdc47f9e18 T0)"
href="https://bugs.llvm.org/show_bug.cgi?id=50108">50108</a>
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<th>Summary</th>
<td>[11.1.0, 12.0.0] AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x000000000000 bp 0x7ffdc47fa0b0 sp 0x7ffdc47f9e18 T0)
</td>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>asan
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>sebastian@pipping.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Hi!
Many thanks for developing Clang and its sanitizers as software libre, it's
been of great help to me multiple times.
I'm running into a situation with AddressSanitizer that could be a bug in
AddressSanitizer, hence this report. The context is libexpat and the related
libexpat issue on GitHub is at <a href="https://github.com/libexpat/libexpat/issues/332">https://github.com/libexpat/libexpat/issues/332</a>
.
Here's how to reproduce it and the related output:
# cd "$(mktemp -d)"
# git clone --depth 1 --branch
issue-332-drop-clang-asan-plus-min-size-workaround
<a href="https://github.com/libexpat/libexpat">https://github.com/libexpat/libexpat</a>
# cd libexpat/
# CC=clang CXX=clang++ LD=clang++ QA_SANITIZER=address
CMAKE_ARGS=-DEXPAT_MIN_SIZE=ON ./.travis.sh
[..]
AddressSanitizer:DEADLYSIGNAL
=================================================================
==30109==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x000000000000 bp 0x7ffc68554570 sp 0x7ffc685542d8 T0)
==30109==Hint: pc points to the zero page.
==30109==The signal is caused by a READ memory access.
==30109==Hint: address points to the zero page.
#0 0x0 (<unknown module>)
#1 0x7f43fba7671f (/lib64/libpthread.so.0+0x1271f)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (<unknown module>)
==30109==ABORTING
[..]
# clang --version
clang version 12.0.0
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm/12/bin
Is this a bug?
Many thanks in advance!
Best
Sebastian</pre>
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