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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - C personality function crashes on ARM EHABI"
href="https://llvm.org/bugs/show_bug.cgi?id=26012">26012</a>
</td>
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<th>Summary</th>
<td>C personality function crashes on ARM EHABI
</td>
</tr>
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<th>Product</th>
<td>compiler-rt
</td>
</tr>
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<th>Version</th>
<td>unspecified
</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>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>compiler-rt
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tzuhsiang.chien@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>If a C function contains a cleanup attribute and the source code is compiled
with -fexceptions, then __gcc_personality_v0() will be called by the unwinder.
However, our __gcc_personality_v0() implementation in compiler-rt is not
compatible with ARM EHABI. Consequently, the mismatch of the function
signature will cause a segmentation fault.
$ cat cleanup.c
extern void my_throw();
int i = 0;
void callback(int *p) {
i = 1;
}
void test_cleanup() {
int a __attribute__((cleanup(callback))) = 1;
my_throw();
}
$ gdb ./bad.out
... skipped ...
Program received signal SIGSEGV, Segmentation fault.
0xb6f6e910 in unw_get_proc_info () from /opt/llvm/lib/libunwind.so.1
(gdb) bt
#0 0xb6f6e910 in unw_get_proc_info () from /opt/llvm/lib/libunwind.so.1
#1 0xb6f73c70 in _Unwind_GetLanguageSpecificData ()
from /opt/llvm/lib/libunwind.so.1
#2 0x000108fc in __gcc_personality_v0 ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)
NOTE: There is a patch (written by Timon Van Overveldt) in the review process
that can fix the problem:
<a href="http://reviews.llvm.org/D15781">http://reviews.llvm.org/D15781</a></pre>
</div>
</p>
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