On Fri Jul 17, 2026 at 7:37 AM EDT, Jiayuan Chen wrote: > Every arena reserves a 4GB kernel vmalloc region at creation, and on a > KASAN build that eagerly populates ~512MB of shadow memory per arena. When > several arena tests run in parallel their shadow adds up, exhausts the > memory of a small CI VM and trips the OOM killer during map creation. > > Make the dedicated arena tests (arena_* and libarena*) serial so they no > longer pile up in the parallel phase. That alone brings the peak number of > live arenas back within the CI memory budget. > > A few other tests such as verifier_arena*, stream and compute_live_registers > create an arena too, but they run inside shared RUN_TESTS()/RUN() suites, so > turning them serial would drag many unrelated subtests along with them. > Leave those as-is. > > Signed-off-by: Jiayuan Chen <[email protected]>
Reviewed-by: Emil Tsalapatis <[email protected]> > --- > tools/testing/selftests/bpf/prog_tests/arena_atomics.c | 2 +- > tools/testing/selftests/bpf/prog_tests/arena_direct_value.c | 2 +- > tools/testing/selftests/bpf/prog_tests/arena_htab.c | 2 +- > tools/testing/selftests/bpf/prog_tests/arena_list.c | 2 +- > tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c | 2 +- > tools/testing/selftests/bpf/prog_tests/arena_strsearch.c | 2 +- > tools/testing/selftests/bpf/prog_tests/libarena.c | 2 +- > tools/testing/selftests/bpf/prog_tests/libarena_asan.c | 2 +- > 8 files changed, 8 insertions(+), 8 deletions(-) > > diff --git a/tools/testing/selftests/bpf/prog_tests/arena_atomics.c > b/tools/testing/selftests/bpf/prog_tests/arena_atomics.c > index d98577a6babc..1ad5d03d07ad 100644 > --- a/tools/testing/selftests/bpf/prog_tests/arena_atomics.c > +++ b/tools/testing/selftests/bpf/prog_tests/arena_atomics.c > @@ -222,7 +222,7 @@ static void test_store_release(struct arena_atomics *skel) > "store_release64_result"); > } > > -void test_arena_atomics(void) > +void serial_test_arena_atomics(void) > { > struct arena_atomics *skel; > int err; > diff --git a/tools/testing/selftests/bpf/prog_tests/arena_direct_value.c > b/tools/testing/selftests/bpf/prog_tests/arena_direct_value.c > index 4b4adb3f4b71..01fcf4965ea4 100644 > --- a/tools/testing/selftests/bpf/prog_tests/arena_direct_value.c > +++ b/tools/testing/selftests/bpf/prog_tests/arena_direct_value.c > @@ -66,7 +66,7 @@ static void test_arena_direct_value_one_past_end(void) > close(map_fd); > } > > -void test_arena_direct_value(void) > +void serial_test_arena_direct_value(void) > { > if (test__start_subtest("one_past_end")) > test_arena_direct_value_one_past_end(); > diff --git a/tools/testing/selftests/bpf/prog_tests/arena_htab.c > b/tools/testing/selftests/bpf/prog_tests/arena_htab.c > index d69fd2465f53..91ccf0402980 100644 > --- a/tools/testing/selftests/bpf/prog_tests/arena_htab.c > +++ b/tools/testing/selftests/bpf/prog_tests/arena_htab.c > @@ -81,7 +81,7 @@ static void test_arena_htab_asm(void) > arena_htab_asm__destroy(skel); > } > > -void test_arena_htab(void) > +void serial_test_arena_htab(void) > { > if (test__start_subtest("arena_htab_llvm")) > test_arena_htab_llvm(); > diff --git a/tools/testing/selftests/bpf/prog_tests/arena_list.c > b/tools/testing/selftests/bpf/prog_tests/arena_list.c > index 4f2866a615ce..2648e06f53d0 100644 > --- a/tools/testing/selftests/bpf/prog_tests/arena_list.c > +++ b/tools/testing/selftests/bpf/prog_tests/arena_list.c > @@ -68,7 +68,7 @@ static void test_arena_list_add_del(int cnt, bool > nonsleepable) > arena_list__destroy(skel); > } > > -void test_arena_list(void) > +void serial_test_arena_list(void) > { > if (test__start_subtest("arena_list_1")) > test_arena_list_add_del(1, false); > diff --git a/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c > b/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c > index acb9d53b5973..545b05d7a0aa 100644 > --- a/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c > +++ b/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c > @@ -101,7 +101,7 @@ static void test_arena_spin_lock_size(int size) > return; > } > > -void test_arena_spin_lock(void) > +void serial_test_arena_spin_lock(void) > { > repeat = 1000; > if (test__start_subtest("arena_spin_lock_1")) > diff --git a/tools/testing/selftests/bpf/prog_tests/arena_strsearch.c > b/tools/testing/selftests/bpf/prog_tests/arena_strsearch.c > index f81a0c066505..0c1c6cbfa0f1 100644 > --- a/tools/testing/selftests/bpf/prog_tests/arena_strsearch.c > +++ b/tools/testing/selftests/bpf/prog_tests/arena_strsearch.c > @@ -23,7 +23,7 @@ static void test_arena_str(void) > arena_strsearch__destroy(skel); > } > > -void test_arena_strsearch(void) > +void serial_test_arena_strsearch(void) > { > if (test__start_subtest("arena_strsearch")) > test_arena_str(); > diff --git a/tools/testing/selftests/bpf/prog_tests/libarena.c > b/tools/testing/selftests/bpf/prog_tests/libarena.c > index ba5a5a50f7c0..df7e4b8dc394 100644 > --- a/tools/testing/selftests/bpf/prog_tests/libarena.c > +++ b/tools/testing/selftests/bpf/prog_tests/libarena.c > @@ -202,7 +202,7 @@ static void run_libarena_parallel_test(struct libarena > *skel, struct bpf_program > run_libarena_parallel_fini(skel, name, prefixlen); > } > > -void test_libarena(void) > +void serial_test_libarena(void) > { > struct arena_alloc_reserve_args args; > struct libarena *skel; > diff --git a/tools/testing/selftests/bpf/prog_tests/libarena_asan.c > b/tools/testing/selftests/bpf/prog_tests/libarena_asan.c > index f897405f701d..9c31b17dbf39 100644 > --- a/tools/testing/selftests/bpf/prog_tests/libarena_asan.c > +++ b/tools/testing/selftests/bpf/prog_tests/libarena_asan.c > @@ -85,7 +85,7 @@ static void run_test(void) > * Run the test depending on whether LLVM can compile arena ASAN > * programs. > */ > -void test_libarena_asan(void) > +void serial_test_libarena_asan(void) > { > #ifdef HAS_BPF_ARENA_ASAN > run_test();
