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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 - -gmodules -gpubnames together cause a crash"
href="https://bugs.llvm.org/show_bug.cgi?id=43661">43661</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>-gmodules -gpubnames together cause a crash
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>l.lunak@centrum.cz
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Using together -gmodules and -gpubnames may lead to a nullptr crash (or
infinite loop if Clang is built with -O2).
Steps to reproduce:
See the attached archive, run a.sh . Removing either -gmodule or -gpubnames
avoids the problem.
Relevant part of backtrace:
#3 0x00007ff64b14b300 __restore_rt (/lib64/libpthread.so.0+0x12300)
#4 0x00007ff6495f825c llvm::DwarfCompileUnit::getUniqueID() const
/home/seli/build/src/llvm/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h:110:41
#5 0x00007ff6495f81cd llvm::emitDWARF5AccelTable(llvm::AsmPrinter*,
llvm::AccelTable<llvm::DWARF5AccelTableData>&, llvm::DwarfDebug const&,
llvm::ArrayRef<std::unique_ptr<llvm::DwarfCompileUnit,
std::default_delete<llvm::DwarfCompileUnit> >
<span class="quote">>)::$_3::operator()(llvm::DWARF5AccelTableData const&) const</span >
/home/seli/build/src/llvm/llvm/lib/CodeGen/AsmPrinter/AccelTable.cpp:579:24
#6 0x00007ff6495f8170 unsigned int llvm::function_ref<unsigned int
(llvm::DWARF5AccelTableData
const&)>::callback_fn<llvm::emitDWARF5AccelTable(llvm::AsmPrinter*,
llvm::AccelTable<llvm::DWARF5AccelTableData>&, llvm::DwarfDebug const&,
llvm::ArrayRef<std::unique_ptr<llvm::DwarfCompileUnit,
std::default_delete<llvm::DwarfCompileUnit> > >)::$_3>(long,
llvm::DWARF5AccelTableData const&)
/home/seli/build/src/llvm/llvm/include/llvm/ADT/STLExtras.h:113:5
#7 0x00007ff6495fddac llvm::function_ref<unsigned int
(llvm::DWARF5AccelTableData const&)>::operator()(llvm::DWARF5AccelTableData
const&) const /home/seli/build/src/llvm/llvm/include/llvm/ADT/STLExtras.h:130:5
#8 0x00007ff6495fdbd0 (anonymous
namespace)::Dwarf5AccelTableWriter<llvm::DWARF5AccelTableData>::emitEntry(llvm::DWARF5AccelTableData
const&) const
/home/seli/build/src/llvm/llvm/lib/CodeGen/AsmPrinter/AccelTable.cpp:486:21
#9 0x00007ff6495fce41 (anonymous
namespace)::Dwarf5AccelTableWriter<llvm::DWARF5AccelTableData>::emitData()
const
/home/seli/build/src/llvm/llvm/lib/CodeGen/AsmPrinter/AccelTable.cpp:506:30
#10 0x00007ff6495ead29 (anonymous
namespace)::Dwarf5AccelTableWriter<llvm::DWARF5AccelTableData>::emit() const
/home/seli/build/src/llvm/llvm/lib/CodeGen/AsmPrinter/AccelTable.cpp:539:3
#11 0x00007ff6495ea462 llvm::emitDWARF5AccelTable(llvm::AsmPrinter*,
llvm::AccelTable<llvm::DWARF5AccelTableData>&, llvm::DwarfDebug const&,
llvm::ArrayRef<std::unique_ptr<llvm::DwarfCompileUnit,
std::default_delete<llvm::DwarfCompileUnit> > >)
/home/seli/build/src/llvm/llvm/lib/CodeGen/AsmPrinter/AccelTable.cpp:575:3
#12 0x00007ff649631905 llvm::DwarfDebug::endModule()
/home/seli/build/src/llvm/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:1256:3
In the lambda in llvm::emitDWARF5AccelTable() the value returned by
"DD.lookupCU(CUDie)" is nullptr. Presumably some of the debug info is not
present because of -gmodules and the PCH used, but this code doesn't account
for such a case?</pre>
</div>
</p>
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