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From: "ks132 at yandex dot ru" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug backtrace/29374] New: Internal-error when printing exception
 backtrace
Date: Sun, 17 Jul 2022 20:31:45 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29374

            Bug ID: 29374
           Summary: Internal-error when printing exception backtrace
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: backtrace
          Assignee: unassigned at sourceware dot org
          Reporter: ks132 at yandex dot ru
  Target Milestone: ---

For this code:

#include <map>
#include <stdexcept>
#include <sstream>

class Handler
{
public:
   typedef int key_type;
   typedef std::map<key_type, int> map_type;

public:
   void operator()(const key_type& key) const
   {
      find(key);
   }

private:
   int find( const key_type& key ) const
   {
      typename map_type::const_iterator it =3D data.find(key);
      if(it =3D=3D data.end())
      {
         std::ostringstream ost;
         throw std::runtime_error(ost.str());
      }

      return it->second;
   }

private:
   map_type data;
};

class State
{
public:
   void find( int type )
   {
      handlers( type );
   }

private:
   Handler  handlers;
};

int main()
{
   State state;
   state.find( 0 );
}

built with GCC 12.1.1 with optimization:
g++ -O1 -g repro.cpp

GDB crashes with internal-error:
$ gdb -batch -ex "catch throw" -ex r -ex bt a.out=20
Catchpoint 1 (throw)
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Catchpoint 1 (exception thrown), 0x00007ffff7e256d1 in __cxa_throw () from
/lib64/libstdc++.so.6
#0  0x00007ffff7e256d1 in __cxa_throw () from /lib64/libstdc++.so.6
#1  0x0000000000401430 in Handler::find (this=3Dthis@entry=3D0x7fffffffde90,
../../gdb/../gdbsupport/array-view.h:217: internal-error: copy: Assertion
`dest.size () =3D=3D src.size ()' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
----- Backtrace -----
0x55895414fe3f ???
0x558954589ab4 ???
0x558954589d50 ???
0x55895472cbf4 ???
0x5589541f729d ???
0x55895420f912 ???
0x558954214239 ???
0x55895421434a ???
0x55895421446a ???
0x5589544b2e88 ???
0x5589544b36d0 ???
0x5589544b80cc ???
0x5589544b9277 ???
0x558954187074 ???
0x5589545205b7 ???
0x55895433c5b1 ???
0x55895433c681 ???
0x55895433e613 ???
0x55895433f13e ???
0x55895407de6d ???
0x7f1fbff9754f ???
0x7f1fbff97608 ???
0x558954086744 ???
0xffffffffffffffff ???
---------------------

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

Aborted (core dumped)

--=20
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