On 2025-12-17 01:12, Grygorii Strashko wrote:
Hi Andrew,
On 17.12.25 01:54, Andrew Cooper wrote:
On 16/12/2025 11:35 pm, Grygorii Strashko wrote:
Hi All,
I experience build failure with following Kconfig combination:
CONFIG_DEBUG=n and CONFIG_XEN_IBT=n
with gcc:
gcc --version
gcc (Ubuntu 11.4.0-1ubuntu1~22.04.2) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There
is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
Is this known issue?
====== log ===============
CC arch/x86/x86_emulate.o
In file included from arch/x86/x86_emulate.c:27:
arch/x86/x86_emulate/x86_emulate.c: In function ‘x86_emulate’:
arch/x86/x86_emulate/x86_emulate.c:70:36: error: writing 1 byte into
a
region of size 0 [-Werror=stringop-overflow=]
70 | gcc11_wrap(ptr)[0 - PFX_BYTES] = ext < ext_8f08 ? 0xc4 :
0x8f; \
arch/x86/x86_emulate/x86_emulate.c:78:9: note: in expansion of macro
‘copy_VEX’
78 | copy_VEX(ptr, vex); \
| ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:8140:13: note: in expansion of
macro ‘copy_REX_VEX’
8140 | copy_REX_VEX(opc, rex_prefix, vex);
| ^~~~~~~~~~~~
In file included from arch/x86/x86_emulate/x86_emulate.c:11,
from arch/x86/x86_emulate.c:27:
arch/x86/x86_emulate/private.h:691:17: note: at offset [0, 4095] into
destination object of size [0, 9223372036854775807] allocated by
‘map_domain_page’
691 | (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) +
\
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:60:21: note: in expansion of macro
‘get_stub’
60 | uint8_t *buf_ = get_stub(stub); \
| ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:3354:15: note: in expansion of
macro ‘init_prefixes’
3354 | opc = init_prefixes(stub);
| ^~~~~~~~~~~~~
arch/x86/x86_emulate/private.h:691:17: note: at offset [1, 4096] into
destination object of size [0, 9223372036854775807] allocated by
‘map_domain_page’
691 | (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) +
\
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:94:21: note: in expansion of macro
‘get_stub’
94 | uint8_t *buf_ = get_stub(stub); \
| ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:3402:15: note: in expansion of
macro ‘init_evex’
3402 | opc = init_evex(stub);
[...]
Hmm - that looks like more of the GCC 11 bounds bugs, but that's what
the gcc11_wrap() visible at the top is supposed to be fixing.
Neither of those CONFIG options ought to be relevant.
Which Ubuntu is this? Is it something local, or from one of our CI
containers? Is this on staging, or local?
Local. Nothing special - "Ubuntu 22.04.5 LTS"
======== apt show gcc
Package: gcc
Version: 4:11.2.0-1ubuntu1
The minimum gcc version is 5.1 on staging, perhaps this is due to that
Priority: optional
Build-Essential: yes
Section: devel
Source: gcc-defaults (1.193ubuntu1)
Origin: Ubuntu
Maintainer: Ubuntu Developers <[email protected]>
Original-Maintainer: Debian GCC Maintainers
<[email protected]>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 51,2 kB
Provides: c-compiler, gcc-x86-64-linux-gnu (= 4:11.2.0-1ubuntu1)
Depends: cpp (= 4:11.2.0-1ubuntu1), gcc-11 (>= 11.2.0-1~)
Recommends: libc6-dev | libc-dev
Suggests: gcc-multilib, make, manpages-dev, autoconf, automake,
libtool, flex, bison, gdb, gcc-doc
Conflicts: gcc-doc (<< 1:2.95.3)
Task: ubuntustudio-video, ubuntustudio-publishing, ubuntu-mate-core,
ubuntu-mate-desktop
Download-Size: 5 112 B
APT-Manual-Installed: yes
APT-Sources: http://ua.archive.ubuntu.com/ubuntu jammy/main amd64
Packages
Description: GNU C compiler
This is the GNU C compiler, a fairly portable optimizing compiler for
C.
.
This is a dependency package providing the default GNU C compiler.
--
Nicola Vetrini, B.Sc.
Software Engineer
BUGSENG (https://bugseng.com)
LinkedIn: https://www.linkedin.com/in/nicola-vetrini-a42471253
