[Bug gdb/29311] [gdb] ThreadSanitizer: data race (/lib64/libtsan.so.2+0x4c5e2) in free

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29311

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 14188
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14188&action=edit
LOG.txt

When trying to reproduce from the command line:
...
$ bash -x ./gdb.sh ./outputs/gdb.ada/char_enum_unicode/foo -batch -ex "break
foo.adb:26" 2>&1 | tee LOG.txt^C
...
I run into a different problem:
...
WARNING: ThreadSanitizer: data race (pid=30917)
  Write of size 8 at 0x7b0400004070 by main thread:
    #0 free <null> (libtsan.so.2+0x4c5e2)
    #1 xfree<char> /data/vries/gdb_versions/devel/src/gdb/../gdbsupport/gdb-x\
free.h:37 (gdb+0x650f17)
    #2 charset_vector::clear() /data/vries/gdb_versions/devel/src/gdb/charset\
.c:703 (gdb+0x651354)
    #3 charset_vector::~charset_vector() /data/vries/gdb_versions/devel/src/g\
db/charset.c:697 (gdb+0x6512d3)
    #4 <null> <null> (libtsan.so.2+0x32643)
    #5 captured_main_1 /data/vries/gdb_versions/devel/src/gdb/main.c:1310 (gd\
b+0xa3975a)

  Previous read of size 1 at 0x7b0400004072 by thread T1:
    [failed to restore the stack]
...

Same thing if I remove -batch and type quit instead.

So, is this a problem with

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