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From: "georgebateman16 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/29871] New: "p tail.y ++ (diff.y / 2)" command causes crash
Date: Sat, 10 Dec 2022 21:03:15 +0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: 12.1
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: georgebateman16 at gmail dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29871

            Bug ID: 29871
           Summary: "p tail.y ++ (diff.y / 2)" command causes crash
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: georgebateman16 at gmail dot com
  Target Milestone: ---

Created attachment 14491
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14491&action=3Ded=
it
GDB session resulting in crash

While debugging a C application I entered the command "p tail.y ++ (diff.y /
2)". (This was a typo; I intended to write "+=3D".) This caused GDB to cras=
h and
output the attached backtrace, starting with:

/build/gdb-YpKTRx/gdb-12.1/gdb/gdbtypes.c:3914: internal-error:
is_nocall_function: Assertion `type->code () =3D=3D TYPE_CODE_FUNC || type-=
>code ()
=3D=3D TYPE_CODE_METHOD' failed.

The tail and diff objects are instances of the below struct, if that is
relevant.

typedef struct {
    int x;
    int y;
} coord;

System information (also in the attachment):

GCC VERSION

Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/usr/lib/gcc/x86_64-linux-gnu/12/lto-wrapper
OFFLOAD_TARGET_NAMES=3Dnvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=3D1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion=3D'Debian 12.2.0-9'
--with-bugurl=3Dfile:///usr/share/doc/gcc-12/README.Bugs
--enable-languages=3Dc,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=3D/usr
--with-gcc-major-version-only --program-suffix=3D-12
--program-prefix=3Dx86_64-linux-gnu- --enable-shared --enable-linker-build-=
id
--libexecdir=3D/usr/lib --without-included-gettext --enable-threads=3Dposix
--libdir=3D/usr/lib --enable-nls --enable-clocale=3Dgnu --enable-libstdcxx-=
debug
--enable-libstdcxx-time=3Dyes --with-default-libstdcxx-abi=3Dnew
--enable-gnu-unique-object --disable-vtable-verify --enable-plugin
--enable-default-pie --with-system-zlib --enable-libphobos-checking=3Drelea=
se
--with-target-system-zlib=3Dauto --enable-objc-gc=3Dauto --enable-multiarch
--disable-werror --enable-cet --with-arch-32=3Di686 --with-abi=3Dm64
--with-multilib-list=3Dm32,m64,mx32 --enable-multilib --with-tune=3Dgeneric
--enable-offload-targets=3Dnvptx-none=3D/build/gcc-12-lH3g9c/gcc-12-12.2.0/=
debian/tmp-nvptx/usr,amdgcn-amdhsa=3D/build/gcc-12-lH3g9c/gcc-12-12.2.0/deb=
ian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver --enable-checking=3Drelease
--build=3Dx86_64-linux-gnu --host=3Dx86_64-linux-gnu --target=3Dx86_64-linu=
x-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (Debian 12.2.0-9)=20

Linux gbat-hp-linux 6.0.0-4-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.0.8-1
(2022-11-11) x86_64 GNU/Linux

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