From: Hou Tao <houtao1@xxxxxxxxxx> Hi, The patchset aims to fix the kmemleak problem reported by Hsin-Wei Hung [0]. Patch #1 fixes the kmemleak problem by re-checking map->usercnt after timer->timer is assigned. Patch #2 adds a selftest for the kmemleak problem. But it is a bit hard to reproduce the kmemleak by only running the test and I managed to reproduce the problem by both running the test and injecting delay before timer->timer is assigned in bpf_timer_init(). Please see individual patches for more details. And comments are always welcome. [0]: https://lore.kernel.org/bpf/CABcoxUaT2k9hWsS1tNgXyoU3E-=PuOgMn737qK984fbFmfYixQ@xxxxxxxxxxxxxx Hou Tao (2): bpf: Check map->usercnt again after timer->timer is assigned selftests/bpf: Test race between map uref release and bpf timer init kernel/bpf/helpers.c | 14 +- .../bpf/prog_tests/timer_init_race.c | 138 ++++++++++++++++++ .../selftests/bpf/progs/timer_init_race.c | 56 +++++++ 3 files changed, 207 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/timer_init_race.c create mode 100644 tools/testing/selftests/bpf/progs/timer_init_race.c -- 2.29.2
