test_maps_tearing_from_split times out when READ_IMPLIES_EXEC is set. This happens by default on pre-ARMv6 CPUs, which lack no-execute support. split_vma() re-maps the first page with mod_info->prot | PROT_EXEC to make it differ from its neighbours. With READ_IMPLIES_EXEC the original mapping is already executable, so no split occurs and the test hangs waiting for the modifier child. Use PROT_NONE for the split mapping, which always differs from its readable neighbours. Fixes: beb69e817246 ("selftests/proc: add /proc/pid/maps tearing from vma split test") Assisted-by: Codex:gpt-5.6-terra Signed-off-by: Karl Mehltretter --- Tested on: - QEMU versatilepb/ARM926EJ-S: maps and smaps fail before, pass after - QEMU realview-eb-mpcore/ARM11MPCore: maps and smaps pass before and after Changes since v1: - v1 went out without any recipients in To: and received no reply in 19 days. - No functional change. reworked the commit message. v1: https://lore.kernel.org/all/20260720061835.6290-1-kmehltretter@gmail.com/ tools/testing/selftests/proc/proc-maps-race.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/proc/proc-maps-race.c b/tools/testing/selftests/proc/proc-maps-race.c index 1026d8c400e1..415eccb70468 100644 --- a/tools/testing/selftests/proc/proc-maps-race.c +++ b/tools/testing/selftests/proc/proc-maps-race.c @@ -490,7 +490,8 @@ static bool query_addr_at(int maps_fd, void *addr, static inline bool split_vma(FIXTURE_DATA(proc_maps_race) *self) { - return mmap(self->mod_info->addr, self->page_size, self->mod_info->prot | PROT_EXEC, + /* PROT_NONE differs from both readable neighbors. */ + return mmap(self->mod_info->addr, self->page_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0) != MAP_FAILED; } -- 2.53.0