[Bug c++/25894] New: gdb crash on uncanny command

["jengelh at inai dot de" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25894

            Bug ID: 25894
           Summary: gdb crash on uncanny command
           Product: gdb
           Version: 8.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: jengelh at inai dot de
  Target Milestone: ---

» cat x.cpp 
struct T { int v; };
int main()
{
        T t, *u = &t;
        u->T::v = 2;
        return u->T::v;
}

» g++ x.cpp -ggdb3
» gdb a.out 
GNU gdb (GDB; openSUSE Tumbleweed) 8.3.1
(gdb) b main
Breakpoint 1 at 0x1129: file x.cpp, line 4.
(gdb) r
Starting program: /dev/shm/a.out 
Breakpoint 1, main () at x.cpp:4
4               T t, *u = &t;
(gdb) n
5               u->T::v = 2;
(gdb) 
6               return u->T::v;
(gdb) l u->T::v
../../gdb/cp-namespace.c:178: internal-error: block_symbol
cp_lookup_bare_symbol(const language_defn*, const char*, const block*,
domain_enum, int): Assertion `strstr (name, "::") == NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) 

A nonsensical command should not crash gdb.

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