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Date: Tue, 9 Jan 2024 09:57:57 +1100
From: Stephen Rothwell <sfr@canb.auug.org.au>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: lucas.dimarchi@intel.com, ogabbay@kernel.org,
 thomas.hellstrom@linux.intel.com, linux-kernel@vger.kernel.org,
 intel-xe@lists.freedesktop.org
Subject: Re: [BUG] allmodconfig build error in next-20240108
Message-ID: <20240109095757.1313b2d9@canb.auug.org.au>
In-Reply-To: <45ad1d0f-a10f-483e-848a-76a30252edbe@paulmck-laptop>
References: <45ad1d0f-a10f-483e-848a-76a30252edbe@paulmck-laptop>
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Hi Paul,

On Mon, 8 Jan 2024 13:33:36 -0800 "Paul E. McKenney" <paulmck@kernel.org> w=
rote:
>
> Recent -next trees get the following build error for allmodconfig builds:
>=20
> ------------------------------------------------------------------------
>=20
> drivers/gpu/drm/xe/xe_gt_pagefault.c: In function =E2=80=98xe_guc_pagefau=
lt_handler=E2=80=99:
> ./include/linux/fortify-string.h:57:33: error: writing 16 bytes into a re=
gion of =C2=A0size 0 [-Werror=3Dstringop-overflow=3D]
> =C2=A0=C2=A0=C2=A057 | #define __underlying_memcpy =C2=A0 =C2=A0 __builti=
n_memcpy
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0| =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 ^
> ./include/linux/fortify-string.h:644:9: note: in expansion of macro =E2=
=80=98__underlying_memcpy=E2=80=99
> =C2=A0=C2=A0644 | =C2=A0 =C2=A0 =C2=A0 =C2=A0 __underlying_##op(p, q, __f=
ortify_size); \
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0| =C2=A0 =C2=A0 =C2=A0 =C2=A0 ^~~~~~~=
~~~~~~
> ./include/linux/fortify-string.h:689:26: note: in expansion of macro =E2=
=80=98__fortify_memcpy_chk=E2=80=99
> =C2=A0=C2=A0689 | #define memcpy(p, q, s)=C2=A0 __fortify_memcpy_chk(p, q=
, s, \
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ^~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/xe/xe_gt_pagefault.c:340:17: note: in expansion of macro =
=E2=80=98memcpy=E2=80=99
> =C2=A0=C2=A0340 | =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 memcpy(pf_queue->data + pf_queue->tail, msg, len * sizeof(u32));
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0| =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 ^~~~~~
> In file included from drivers/gpu/drm/xe/xe_device_types.h:17,
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0from drivers/gpu/drm/xe/xe_vm_types.h:16,
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0from drivers/gpu/drm/xe/xe_bo.h:13,
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0from drivers/gpu/drm/xe/xe_gt_pagefault.c:16:
> drivers/gpu/drm/xe/xe_gt_types.h:102:25: note: at offset [1144, 265324] i=
nto destination object =E2=80=98tile=E2=80=99 of size 8
> =C2=A0=C2=A0102 | =C2=A0 =C2=A0 =C2=A0 =C2=A0 struct xe_tile *tile;
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0|

Which architecture?  What compiler and version?  Anything special in your b=
uild
setup?  I do x86_64 allmodconfig builds all day with gcc v13.2 and I don't =
see
this failure.

--=20
Cheers,
Stephen Rothwell

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