https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106297
Bug ID: 106297
Summary: stringop-overflow misbehaviour on atomic
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chipitsine at gmail dot com
Target Milestone: ---
repro steps
git clone https://github.com/haproxy/haproxy
cd haproxy
export CC=/path/to/gcc
make CC=$CC ERR=1 TARGET=linux-glibc
error reported:
src/haproxy.c: In function ‘run_poll_loop’:
include/haproxy/atomic.h:428:39: error: ‘__atomic_load_8’ writing 8 bytes into
a region of size 0 overflows the destination [-Werror=stringop-overflow=]
428 | #define _HA_ATOMIC_LOAD(val) __atomic_load_n(val,
__ATOMIC_RELAXED)
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/haproxy.c:2843:46: note: in expansion of macro ‘_HA_ATOMIC_LOAD’
2843 | if
((_HA_ATOMIC_LOAD(&ha_tgroup_ctx[i].stopping_threads) &
ha_tgroup_info[i].threads_enabled) !=
| ^~~~~~~~~~~~~~~
compilation terminated due to -Wfatal-errors.
error was reviewed by Willy Tarreau in
https://github.com/haproxy/haproxy/issues/1767 and it is considered as false
positive.
I bisected gcc, breaking change is:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=88b504b7a8c5affb0ffa97990d22af2b199e36ed
