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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Throwing C++ exceptions crashes in code which is compiled with clang++ 8 and running on Cygwin64"
href="https://bugs.llvm.org/show_bug.cgi?id=43668">43668</a>
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<th>Summary</th>
<td>Throwing C++ exceptions crashes in code which is compiled with clang++ 8 and running on Cygwin64
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>zettsu.tatsuya@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Throwing C++ exceptions crashes in code which is compiled with clang++ 8.0.1
(Target: x86_64-unknown-windows-cygnus) and running on Cygwin 64-bit
installation 3.0.7. Compiling with -O0 option causes a crash and compiling with
-O2 option does not.
This does not occur with Cygwin g++ 7.4.0, MinGW g++ 8.2.0 and Windows native
clang++ 8.0.1 (Target: x86_64-pc-windows-msvc).
The following code crashes. Full source code is available on
<a href="https://github.com/zettsu-t/throwAndCatch">https://github.com/zettsu-t/throwAndCatch</a> .
1. A free function calls another function
2. The later function invokes (calls the operator() of) a std::function
instance
3. The invoked instance throws an exception.
void invokeFunc(std::function<void(void)>& func) {
func();
}
void throwInLocal(void) {
throw std::runtime_error("Error");
}
std::function<void(void)> funcObj = &throwInLocal;
invokeFunc(funcObj);
This is a gdb backtrace when throwing an exception crashed.
gdb: unknown target exception 0x20474343 at 0x7fface6ea839
Thread 1 "throw_catch_clang" received signal ?, Unknown signal.
0x00007fface6ea839 in RaiseException () from
/cygdrive/c/WINDOWS/System32/KERNELBASE.dll
(gdb) bt
#0 0x00007fface6ea839 in RaiseException () from
/cygdrive/c/WINDOWS/System32/KERNELBASE.dll
#1 0x00000003de6bcbf1 in cyggcc_s-seh-1!_Unwind_RaiseException () from
/usr/bin/cyggcc_s-seh-1.dll
#2 0x00000003c3599148 in cygstdc++-6!.cxa_throw () from
/usr/bin/cygstdc++-6.dll
#3 0x0000000100401948 in (anonymous namespace)::throwInLocal () at
throw_catch_main.cpp:12
#4 0x0000000100402c65 in std::_Function_handler<void (), void
(*)()>::_M_invoke(std::_Any_data const&)
(__functor=...) at
/usr/lib/gcc/x86_64-pc-cygwin/7.4.0/include/c++/bits/std_function.h:316
#5 0x00000001004032aa in std::function<void ()>::operator()() const
(this=0xffffcb58)
at
/usr/lib/gcc/x86_64-pc-cygwin/7.4.0/include/c++/bits/std_function.h:706
#6 0x00000000ffffc8a8 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
I found invoking the std::function instance in other statements prevents
crashes like shown below.
std::function<void(void)> funcObj = &throwInLocal;
funcObj();
invokeFunc(funcObj);</pre>
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