Created attachment 1744665 [details] bt full I was inspecting a gnome-shell core and wanted to print a variable. I tab-completed it, some warning got printed, then Enter aborted gdb. gdb-10.1-2.fc34.x86_64 #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:49 #1 0x00007fece54db8a4 in __GI_abort () at abort.c:79 #2 0x000055ebffc6c6f8 in std::__replacement_assert (__file=__file@entry=0x55ec00263438 "/usr/include/c++/11/string_view", __line=__line@entry=211, __function=__function@entry=0x55ec002632e0 "constexpr const value_type& std::basic_string_view<_CharT, _Traits>::operator[](std::basic_string_view<_CharT, _Traits>::size_type) const [with _CharT = char; _Traits = std::char_traits<char>; std::ba"..., __condition=__condition@entry=0x55ec00264cbe "__pos < this->_M_len") at /usr/include/c++/11/x86_64-redhat-linux/bits/c++config.h:2624 #3 0x000055ebffc729b7 in std::basic_string_view<char, std::char_traits<char> >::operator[] (this=<synthetic pointer>, __pos=0) at /usr/include/c++/11/string_view:211 #4 std::basic_string_view<char, std::char_traits<char> >::operator[] (__pos=0, this=<synthetic pointer>) at /usr/include/c++/11/string_view:209 #5 ada_lookup_name_info::ada_lookup_name_info (this=0x7ffc2602b2b8, lookup_name=...) at ../../gdb/ada-lang.c:13595 #6 0x000055ebffc74cc8 in gdb::optional<ada_lookup_name_info>::emplace<lookup_name_info const&> (this=0x7ffc2602b2b8) at ../../gdb/../gdbsupport/gdb_optional.h:155 #7 lookup_name_info::maybe_init<gdb::optional<ada_lookup_name_info>>(gdb::optional<ada_lookup_name_info>&) const (field=..., this=0x7ffc2602b2a0) at ../../gdb/symtab.h:312 #8 lookup_name_info::ada (this=0x7ffc2602b2a0) at ../../gdb/symtab.h:277 #9 ada_symbol_name_matches (symbol_search_name=0x55ec025a0350 "annobin_abi_note.c.exit", lookup_name=..., comp_match_res=0x55ec11875f10) at ../../gdb/ada-lang.c:13658 #10 0x000055ec0001e119 in compare_symbol_name (match_res=..., lookup_name=..., symbol_language=<optimized out>, symbol_name=0x55ec025a0350 "annobin_abi_note.c.exit") at ../../gdb/symtab.c:5264 #11 completion_list_add_name (tracker=..., symbol_language=<optimized out>, symname=0x55ec025a0350 "annobin_abi_note.c.exit", lookup_name=..., text=0x7ffc2602b530 "", word=0x7ffc2602b530 "") at ../../gdb/symtab.c:5280 #12 0x000055ec0001ebf8 in completion_list_add_msymbol (word=0x7ffc2602b530 "", text=0x7ffc2602b530 "", lookup_name=..., sym=0x55ec026505a0, tracker=...) at ../../gdb/symtab.c:5352 #13 default_collect_symbol_completion_matches_break_on (tracker=..., mode=<optimized out>, name_match_type=<optimized out>, text=<optimized out>, word=<optimized out>, break_on=<optimized out>, code=<optimized out>) at ../../gdb/symtab.c:5695 #14 0x000055ec0001f4c4 in language_defn::collect_symbol_completion_matches (code=TYPE_CODE_UNDEF, word=0x7ffc2602b410 "\020_\207\021\354U", text=0x7ffc2602b530 "", name_match_type=symbol_name_match_type::EXPRESSION, mode=complete_symbol_mode::EXPRESSION, tracker=..., this=<optimized out>) at ../../gdb/language.h:475 #15 collect_symbol_completion_matches (tracker=..., mode=mode@entry=complete_symbol_mode::EXPRESSION, name_match_type=name_match_type@entry=symbol_name_match_type::EXPRESSION, text=text@entry=0x7ffc2602b530 "", word=word@entry=0x7ffc2602b530 "") at ../../gdb/symtab.c:5819 #16 0x000055ebffd4cee7 in complete_files_symbols (word=0x7ffc2602b530 "", text=<optimized out>, tracker=...) at ../../gdb/completer.c:614 #17 complete_expression (tracker=..., text=0x7ffc2602b522 "configuration ", word=0x7ffc2602b530 "") at ../../gdb/completer.c:1182 #18 0x000055ebfff1bdc3 in print_command_completer (ignore=0x55ec02437b90, tracker=..., text=<optimized out>) at ../../gdb/printcmd.c:1241 #19 0x000055ebffd4acfd in complete_line_internal_1 (tracker=..., text=<optimized out>, line_buffer=<optimized out>, point=<optimized out>, reason=handle_brkchars) at ../../gdb/completer.c:1537 #20 0x000055ebffd4ad46 in complete_line_internal (tracker=..., text=<optimized out>, line_buffer=<optimized out>, point=<optimized out>, reason=<optimized out>) at ../../gdb/completer.c:1556 #21 0x000055ebffd4b7b6 in gdb_completion_word_break_characters_throw () at ../../gdb/completer.c:2012 #22 gdb_completion_word_break_characters () at ../../gdb/completer.c:2050 #23 0x00007fece63fa08a in _rl_find_completion_word (fp=fp@entry=0x7ffc2602b678, dp=dp@entry=0x7ffc2602b67c) at ../complete.c:1076 #24 0x00007fece63ff67c in rl_complete_internal (what_to_do=9) at ../complete.c:2007 #25 0x00007fece63f70e7 in _rl_dispatch_subseq (key=9, map=<optimized out>, got_subseq=<optimized out>) at ../readline.c:852 #26 0x00007fece63f7605 in _rl_dispatch (key=<optimized out>, map=<optimized out>) at ../readline.c:798 #27 0x00007fece63f80a5 in readline_internal_char () at ../readline.c:632 #28 0x00007fece641a225 in rl_callback_read_char () at ../callback.c:262 #29 0x000055ebffde4d86 in gdb_rl_callback_read_char_wrapper_noexcept () at ../../gdb/event-top.c:178 #30 0x000055ebffde59f4 in gdb_rl_callback_read_char_wrapper (client_data=<optimized out>) at ../../gdb/event-top.c:194 #31 0x000055ebffde4b68 in stdin_event_handler (error=<optimized out>, client_data=0x55ec02236ec0) at ../../gdb/event-top.c:519 #32 0x000055ec00226686 in gdb_wait_for_event (block=block@entry=0) at ../../gdbsupport/event-loop.cc:673 #33 0x000055ec0022693a in gdb_wait_for_event (block=0) at ../../gdbsupport/event-loop.cc:569 #34 gdb_do_one_event () at ../../gdbsupport/event-loop.cc:190 #35 0x000055ebffeaaab5 in start_event_loop () at ../../gdb/main.c:356 #36 captured_command_loop () at ../../gdb/main.c:416 #37 0x000055ebffead525 in captured_main (data=<optimized out>) at ../../gdb/main.c:1299 #38 gdb_main (args=<optimized out>) at ../../gdb/main.c:1314 #39 0x000055ebffc55290 in main (argc=<optimized out>, argv=<optimized out>) at ../../gdb/gdb.c:40
(In reply to Ivan Molodetskikh from comment #0) > I was inspecting a gnome-shell core and wanted to print a variable. I > tab-completed it, some warning got printed, then Enter aborted gdb. Do you recall the string you entered which you then tried to tab-complete? Do you know if this problem is reproducible without the core file?
I tried reproducing it the same way I got the crash with the same core file, but I couldn't get the crash again. The interaction was something like up up up p con<Tab><Tab> Display all 200 possibilities? n p conf<Tab><Tab> At this point it printed something weird into the output and pressing Enter lead to an abort. However, when I try this now "p conf<Tab><Tab>" works as intended (shows a few things starting with conf).
This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle. Changing version to 34.
I'm able to reproduce this bug now. I'm working on a fix...
I believe that this patch... https://sourceware.org/pipermail/gdb-patches/2021-February/175976.html ...fixes this bug. I'm still waiting for it to be reviewed.
I'm changing the version back to 'rawhide' since the problem requires that the build use -D_GLIBCXX_DEBUG in the CFLAGS in order to trigger the assertion failure. This only happens in rawhide gdb releases. (I've tested the gdb binary from gdb-10.1-4.fc34.x86_64 and cannot reproduce the problem.)
Patch mentioned in comment 5 has been applied and the rawhide package has been successfully rebuilt. I'm closing this bug.
FEDORA-2021-41af532e06 has been submitted as an update to Fedora 34. https://bodhi.fedoraproject.org/updates/FEDORA-2021-41af532e06
FEDORA-2021-41af532e06 has been pushed to the Fedora 34 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-41af532e06` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-41af532e06 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2021-41af532e06 has been pushed to the Fedora 34 stable repository. If problem still persists, please make note of it in this bug report.