[Octave-bug-tracker] [bug #62207] segfault in bug-35881/bug-35881.tst in 32-bit ARM and MIPS

[Arun Giridhar]

Follow-up Comment #11, bug #62207 (project octave):

The sequence seems to be:

1. In the process of cleaning up, the function remove_all_breakpoints() is
called.

2. In the process of getting a list of breakpoints to clean up one by one, it
is going through a list of relevant lines and expressions.

3. Finding none, it is returning -1 for line number or expression number.

4. In certain circumstances (32 bit architecture etc), this causes a
segfault.

The location seems to be this in pt-bp.cc:


    117   void
    118   tree_breakpoint::visit_break_command (tree_break_command& cmd)
    119   {
    120     if (cmd.line () >= m_line)
    121       take_action (cmd);
    122   }


What happens here if cmd.line() is -1? Will the take_action() always be
skipped? Can m_line ever be -1?


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