[Bug rust/20603] New: gdb fails to properly restart a rust test executable

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20603

            Bug ID: 20603
           Summary: gdb fails to properly restart a rust test executable
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: rust
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

This is on x86-64 Fedora 24.

I'm debugging a rust test program built with "cargo test".
I have some breakpoints set.
During debugging I fix a bug and recompile.
Then I re-"run" in gdb.

This ought to work, but doesn't restore my breakpoints.
I'm not sure if this is some generic gdb bug or something
specific to rust (haven't tried other programs).

gdb shows this:

(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
`/home/tromey/gdb/gimli/target/debug/gimli-3e606a263c016831' has changed;
re-reading symbols.
Error in re-setting breakpoint 3: Cannot access memory at address
0x5555556037b0
warning: Missing auto-load script at offset 0 in section .debug_gdb_scripts
of file /home/tromey/gdb/gimli/target/debug/gimli-3e606a263c016831.
Use `info auto-load python-scripts [REGEXP]' to list them.
Starting program: /home/tromey/gdb/gimli/target/debug/gimli-3e606a263c016831
test_eval_arith
warning: Probes-based dynamic linker interface failed.
Reverting to original interface.

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