[Bug symtab/31626] New: [gdb/symtab] data races in gdb.rust/dwindex.exp

[Bug symtab/31626] New: [gdb/symtab] data races in gdb.rust/dwindex.exp

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31626

            Bug ID: 31626
           Summary: [gdb/symtab] data races in gdb.rust/dwindex.exp
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Created attachment 15457
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15457&action=edit
gdb.log

I did a run with fedora asahi 39 and -fsanitize=thread, and ran into a issues I
haven't seen before in test-case gdb.rust/dwindex.exp:
...
SUMMARY: ThreadSanitizer: data race bfd.h:2449 in bfd_get_section_limit_octets
SUMMARY: ThreadSanitizer: data race /home/vries/gdb/src/bfd/bfdio.c:514 in
bfd_seek
...

Rust compiler version:
...
$ rustc --version
rustc 1.77.0 (aedd173a2 2024-03-17) (Fedora 1.77.0-1.fc39)
...

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[Bug symtab/31626] [gdb/symtab] data races in gdb.rust/dwindex.exp

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31626

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org
             Blocks|                            |29366


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=29366
[Bug 29366] [meta] New DWARF indexer meta bug
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[Bug symtab/31626] [gdb/symtab] data races in gdb.rust/dwindex.exp

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31626

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |31751


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=31751
[Bug 31751] re-enable background DWARF reading
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[Bug symtab/31626] [gdb/symtab] data races in gdb.rust/dwindex.exp

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31626

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Both load_auto_scripts_for_objfile and gdb_bfd_map_section call
bfd_get_full_section_contents, which might seek/read.

The BFD threading approach is that really only one thread
can use a BFD at a time, so in this case we probably need
the locking in gdb.

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