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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - lld crash on guid collision when using thinlto"
href="https://bugs.llvm.org/show_bug.cgi?id=43250">43250</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>lld crash on guid collision when using thinlto
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>the_jk@opera.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22479" name="attach_22479" title="Full stacktrace">attachment 22479</a> <a href="attachment.cgi?id=22479&action=edit" title="Full stacktrace">[details]</a></span>
Full stacktrace
Happened upon a crash in lld when linking Chromium (see
<a href="https://crbug.com/1000691">https://crbug.com/1000691</a>).
Two global symbols (one function and one variable) from different modules end
up with the same GUID.
When linking using thinlto this leads to a crash because code in
FunctionImportUtils.cpp treats any GlobalValue with a GlobalVarSummary attached
as a GlobalVariable but as both the symbols have the same GUID the global
function also has the GlobalVarSummary attached.
Assert:
ld.lld: chromium/src/third_party/llvm/llvm/include/llvm/Support/Casting.h:264:
typename cast_retty<X, Y *>::ret_type llvm::cast(Y *) [X =
llvm::GlobalVariable, Y = llvm::GlobalValue]: Assertion `isa<X>(Val) &&
"cast<Ty>() argument of incompatible type!"' failed.
Top of stacktrace (full stacktrace attached):
#4 0x000056267cb57788 in llvm::cast<llvm::GlobalVariable, llvm::GlobalValue>
(Val=<optimized out>)
at chromium/src/third_party/llvm/llvm/include/llvm/Support/Casting.h:264
#5 llvm::FunctionImportGlobalProcessing::processGlobalForThinLTO
(this=0x7f7ec9d06720, GV=...)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:252
#6 0x000056267cb5792c in
llvm::FunctionImportGlobalProcessing::processGlobalsForThinLTO
(this=0x7f7ec9d06720)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:296
#7 0x000056267cb57bfd in llvm::FunctionImportGlobalProcessing::run
(this=0x7f7ec9d06720)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:312
#8 llvm::renameModuleForThinLTO (M=..., Index=..., GlobalsToImport=<optimized
out>)
at
chromium/src/third_party/llvm/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp:319</pre>
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