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From: "guillaume at morinfr dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug breakpoints/29277] New: jit_event_handler: Assertion
 `jiter->jiter_data != nullptr' failed with separate debug files
Date: Wed, 22 Jun 2022 19:20:11 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29277

            Bug ID: 29277
           Summary: jit_event_handler: Assertion `jiter->jiter_data !=3D
                    nullptr' failed with separate debug files
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: guillaume at morinfr dot org
  Target Milestone: ---

Similar to https://sourceware.org/bugzilla/show_bug.cgi?id=3D27889, we are
hitting the same assertion handler with separate debug files.

This is just by running the program. No bp set but it does crash in the
breakpoint code:

----- Backtrace -----=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c94740570e gdb_internal_backtrace_1=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/bt-utils.c:122=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c9474057b6 _Z22gdb_internal_backtracev=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/bt-utils.c:168=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c9479240d6 internal_vproblem=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/utils.c:394=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c947924409 _Z15internal_verrorPKciS0_P13__va_list_tag=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/utils.c:471=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c947a87bcc _Z14internal_errorPKciS0_z=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdbsupport/errors.cc:55=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c94766927a _Z17jit_event_handlerP7gdbarchP7objfile=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/jit.c:1252=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c9473d2a40 handle_jit_event=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/breakpoint.c:5552=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c9473d2dbd _Z20bpstat_run_callbacksP6bpstat=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/breakpoint.c:5753=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c947650b18 process_event_stop_test=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/infrun.c:6452=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x55c9476509ed handle_signal_stop=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20
        /usr/scratch/tmp/gdb-12.1/gdb/infrun.c:6420
0x55c94764ed12 handle_inferior_event
        /usr/scratch/tmp/gdb-12.1/gdb/infrun.c:5681
0x55c94764ac59 _Z20fetch_inferior_eventv
        /usr/scratch/tmp/gdb-12.1/gdb/infrun.c:4085
0x55c94762b0bb _Z22inferior_event_handler19inferior_event_type
        /usr/scratch/tmp/gdb-12.1/gdb/inf-loop.c:41
0x55c947690fbf handle_target_event
        /usr/scratch/tmp/gdb-12.1/gdb/linux-nat.c:4154
0x55c947a889e1 handle_file_event
        /usr/scratch/tmp/gdb-12.1/gdbsupport/event-loop.cc:574
0x55c947a88f80 gdb_wait_for_event
        /usr/scratch/tmp/gdb-12.1/gdbsupport/event-loop.cc:700
0x55c947a87d00 _Z16gdb_do_one_eventv
        /usr/scratch/tmp/gdb-12.1/gdbsupport/event-loop.cc:212
0x55c9476be153 start_event_loop
        /usr/scratch/tmp/gdb-12.1/gdb/main.c:421
0x55c9476be287 captured_command_loop
        /usr/scratch/tmp/gdb-12.1/gdb/main.c:481
0x55c9476bfd5f captured_main
        /usr/scratch/tmp/gdb-12.1/gdb/main.c:1351
0x55c9476bfdc5 _Z8gdb_mainP18captured_main_args
        /usr/scratch/tmp/gdb-12.1/gdb/main.c:1366
0x55c9473071fe main
        /usr/scratch/tmp/gdb-12.1/gdb/gdb.c:32

The objfile is:
p  *jit_bp_sym.objfile
$2 =3D {original_name =3D 0x55c94a129950
"build-id/cb/38660bc052d7379d50faef77e2dec1.debug", addr_low =3D 0, flags =
=3D
{m_enum_value =3D (OBJF_REORDERED | OBJF_PSYMTABS_READ | OBJF_MAINLINE)},
  pspace =3D 0x55c949e5a8b0, compunit_symtabs =3D 0x55c94aea7cc0, obfd =3D
0x55c94a076e50, per_bfd =3D 0x55c94a0e7760, mtime =3D 1655843985, objfile_o=
bstack =3D
{chunk_size =3D 4064, chunk =3D 0x55c94f504a10,
    object_base =3D 0x55c94f508f90 "", next_free =3D 0x55c94f508f90 "", chu=
nk_limit
=3D 0x55c94f508fdb "", temp =3D {i =3D 0, p =3D 0x0}, alignment_mask =3D 15=
, chunkfun =3D
{plain =3D 0x55c9473716d4 <xmalloc(size_t)>,
    extra =3D 0x55c9473716d4 <xmalloc(size_t)>}, freefun =3D {plain =3D
0x55c94772b7d2 <xfree<void>(void*)>, extra =3D 0x55c94772b7d2
<xfree<void>(void*)>}, extra_arg =3D 0x0, use_extra_arg =3D 0, maybe_empty_=
object =3D
0,
    alloc_failed =3D 0}, sf =3D 0x55c947f5f5e0 <elf_sym_fns>, qf =3D
std::forward_list =3D {[0] =3D std::unique_ptr<quick_symbol_functions> =3D =
{get() =3D
0x55c94a109de0}}, registry_data =3D {data =3D 0x55c94a12ac00,
    num_data =3D 21}, section_offsets =3D std::vector of length 46, capacit=
y 46 =3D
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,=
 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0}, sect_index_text =3D 12, sect_index_data =3D 28, sect_index_bss =
=3D 31,
sect_index_rodata =3D 15, sections =3D 0x55c94a1299a0, sections_end =3D
0x55c94a129df0, separate_debug_objfile =3D 0x0,
  separate_debug_objfile_backlink =3D 0x55c94a024d80, separate_debug_objfil=
e_link
=3D 0x0, stats =3D {n_syms =3D 34783, n_stabs =3D 0, n_types =3D 31535, sz_=
strtab =3D 0},
template_symbols =3D 0x55c94f402c90,
  static_links =3D std::unique_ptr<htab> =3D {get() =3D 0x0}, jiter_data =3D
std::unique_ptr<jiter_objfile_data> =3D {get() =3D 0x0}, jited_data =3D
std::unique_ptr<jited_objfile_data> =3D {get() =3D 0x0},
  skip_jit_symbol_lookup =3D false}

A member of our team suggested here that the code should be calling
jit_event_handler should be called with the
jit_bp_sym.objfile->separate_debug_objfile_backlink if it is set.  With this
change, gdb does not crash anymore but we're unfamiliar with the gdb code so
this might be incorrect.

Thanks in advance.

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