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c++/2495: Calling a function that has a throw, but an out of frame exception handler via inferior function call results in sigabrt delivery to inferior
- From: pmuldoon at redhat dot com
- To: gdb-gnats at sources dot redhat dot com
- Date: 5 Aug 2008 17:26:33 -0000
- Subject: c++/2495: Calling a function that has a throw, but an out of frame exception handler via inferior function call results in sigabrt delivery to inferior
- Reply-to: pmuldoon at redhat dot com
>Number: 2495
>Category: c++
>Synopsis: Calling a function that has a throw, but an out of frame exception handler via inferior function call results in sigabrt delivery to inferior
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: change-request
>Submitter-Id: net
>Arrival-Date: Tue Aug 05 17:28:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator: pmuldoon@redhat.com
>Release: 6.8
>Organization:
>Environment:
>Description:
Please see attached test case C++ file. The test case has three functions
call_none () - basic test of inferior function call. Print then return.
call_throw_with_inframe_handler () - test where an exception is thrown and caught locally, within the same frame.
call_throw_no_inframe_handler () - test where an exception is thrown, but not caught locally. The catch for this is in main().
Output from GDB:
g++ -g infthrow.cxx -o infthrow
gdb infthrow
(gdb) b main
Breakpoint 1 at 0x400b8c: file infthrow.cxx, line 31.
(gdb) r
Starting program: /home/pmuldoon/exceptions/infthrow
Breakpoint 1, main () at infthrow.cxx:31
31 call_throw_with_inframe_handler ();
(gdb) print call_throw_with_inframe_handler()
Throw exception with the handler in another frame.
Local exception handled.
$1 = void
(gdb) print call_none()
Do nothing.
$2 = void
(gdb) print call_throw_no_inframe_handler()
throw exception with the handler in another frame
terminate called after throwing an instance of 'int'
Program received signal SIGABRT, Aborted.
0x0000003c49e32215 in raise () from /lib64/libc.so.6
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on"
Evaluation of the expression containing the function (call_throw_no_inframe_handler()) will be abandoned.
It appears that when __cxa_throw calls __Unwind_RaiseException it is returning _URC_END_OF_STACK which means it cannot find a matching handler in any frame. This is probably due to the mechanics of inferior function calls. As a result, it cannot find the handler in main() and this defaults to the default C++ handler which calls abort.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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