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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/27893] [fission] segfault in
 dw2_expand_symtabs_matching_one
Date: Thu, 20 May 2021 23:03:40 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27893

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> When running test-case gdb.base/jit-elf-so.exp with target board fission,=
 I
> run into:
> ...
> (gdb) PASS: gdb.base/jit-elf-so.exp: one_jit_test-1: continue to breakpoi=
nt:
> break here after-dlopen
> break
> /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/jit-elf-main.c:=
76^M
> ERROR: GDB process no longer exists
> GDB process exited with wait status 8504 exp9 0 0 CHILDKILLED SIGABRT SIG=
ABRT
> UNRESOLVED: gdb.base/jit-elf-so.exp: one_jit_test-1: setting breakpoint at
> /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/jit-elf-main.c:=
76
> (eof)
> ...
>=20
>=20
> In more detail:
> ...
> $ gdb --args gdb -q -batch -x ./outputs/gdb.base/jit-elf-so/gdb.in.1=20
>   ...
> Thread 1 "gdb" received signal SIGSEGV, Segmentation fault.
> 0x000000000066f46c in dw2_expand_symtabs_matching_one(dwarf2_per_cu_data =
*,
> dwarf2_per_objfile *, gdb::function_view<bool(char const*, bool)>,
> gdb::function_view<bool(compunit_symtab*)>)
>     (per_cu=3D0x29b67a0, per_objfile=3D0x2442110, file_matcher=3D...,
> expansion_notify=3D...)
>     at /home/vries/gdb_versions/devel/src/gdb/dwarf2/read.c:4119
> 4119      if (file_matcher =3D=3D NULL || per_cu->v.quick->mark)
> (gdb)=20
> ...

And the segfault happens because file_matcher !=3D NULL and per_cu->v.quick=
 =3D=3D
NULL.

--=20
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