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From: "zbigniew2011 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30872] New: Assertion `buffer.copy_insn_closure.get () !=
 nullptr' failed
Date: Tue, 19 Sep 2023 09:43:55 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: 13.1
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: zbigniew2011 at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30872

            Bug ID: 30872
           Summary: Assertion `buffer.copy_insn_closure.get () !=3D nullptr'
                    failed
           Product: gdb
           Version: 13.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: zbigniew2011 at gmail dot com
  Target Milestone: ---

During any attempt of debugging session with ARM32 assembler binary gdb
13.1/13.2 breaks on regular basis:

(gdb) break _start
Breakpoint 1 at 0x1005c
(gdb) run
Starting program: /home/zb/devel/pi-asm-master/06_first_data.bin=20

Breakpoint 1, 0x0001005c in _start ()
(gdb) nexti
0x00010060 in _start ()
(gdb) nexti
/build/gdb-qUBixh/gdb-13.2/gdb/displaced-stepping.c:287: internal-error:
copy_insn_closure_by_addr: Assertion `buffer.copy_insn_closure.get () !=3D
nullptr' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
----- Backtrace -----
0x4ce739 ???
0x6ea34b ???
0x6ea4f1 ???
0x7ce215 ???
0x53065b ???
[..]
0x585b15 ???
0x584a49 ???
---------------------
/build/gdb-qUBixh/gdb-13.2/gdb/displaced-stepping.c:287: internal-error:
copy_insn_closure_by_addr: Assertion `buffer.copy_insn_closure.get () !=3D
nullptr' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) n

About any simple assembler program can be used to repeat this; it happens a=
ll
the time. Still I paste the one used in that attempt:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
.section .rodata=20
msg:
    .ascii "Hello, World\n"

.text
.align 2

SYS_EXIT =3D 1
SYS_WRITE =3D 4
STDOUT =3D 1

.global _start

exit:
    mov    r7, #SYS_EXIT
    svc    #0

_start:
    mov    r7, #SYS_WRITE
    mov    r0, #STDOUT
    ldr    r1, =3Dmsg
    mov    r2, #13
    svc    #0

    // Now exit
    mov    r0, #0
    b      exit
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
as program.s -o program.o && ld program.o -o program.bin
Then simply: gdb -q ./program.bin =E2=80=94 and the rest like above; after =
second or
third =E2=80=9Enexti=E2=80=9D gdb will ALWAYS break.

Tested both 13.1 and 13.2 versions of gdb.

Gear: Banana Pi M2+, Armbian =E2=80=9EBookworm=E2=80=9D, ARM32 =E2=80=94 he=
re's an excerpt from
cpuinfo:

processor       : 0
model name      : ARMv7 Processor rev 5 (v7l)
BogoMIPS        : 22.85
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva i=
divt
vfpd32 lpae evtstrm=20
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xc07
CPU revision    : 5
[..]
Hardware        : Allwinner sun8i Family
Revision        : 0000
Serial          : 02c00081f0069981

--=20
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