[Bug gdb/27743] Internal error psymtab.c

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27743

--- Comment #15 from Simon Marchi <simark at simark dot ca> ---
(In reply to Ethan Zhang from comment #11)
> I have found it to be related to link time optimization and setting a break
> point with absolute path.
> 
> Compile a piece of source code with gcc9 using link time optimization, for
> example:
>     g++-9 -ggdb -flto test.cpp -o test
> 
> Load "test" into GDB 10, then set break point using absolute path:
>     break /path/to/test:(line number)
> 
> That should be enough to reproduce the issue.
> 
> And it seems to only appear when the program is compiled with gcc9 with lto,
> debug using gdb10 and have a break point set in absolute path.
> 
> The content of the source code doesn't seem to make a difference.
> If the source code is compiled in gcc10 with lto, this issue doesn't appear.
> If the break point is set through relative path, this issue doesn't appear.

Oh, that triggers the bug for me indeed!  Here's my full setup:

- Ubuntu 20.04
- Package gcc-arm-none-eabi (arm-none-eabi-gcc (15:9-2019-q4-0ubuntu1) 9.2.1
20191025 (release) [ARM/arm-9-branch revision 277599])
- Source file:

---8<---
extern "C" void _exit(int code)
{
  for (;;);
}

int main(void) {
    return 0;
}
--->8---

- Compiler command: arm-none-eabi-g++ -ggdb -flto test.cpp -o test
- GDB command:

$ ./gdb -nx -q --data-directory=data-directory ~/test -ex "b
/home/smarchi/test.cpp:7"
Reading symbols from /home/smarchi/test...
/home/smarchi/src/binutils-gdb/gdb/psymtab.c:132: internal-error: bool
partial_map_expand_apply(objfile*, const char*, const char*, partial_symtab*,
gdb::function_view<bool(symtab*)>): Assertion `pst->user == NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) 

I'll attach the binary shortly.

And indeed, I don't see the problem with master.

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