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| author |   Hou Tao <houtao1@huawei.com> | 2023-09-01 19:19:54 +0800 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2023-09-08 08:42:19 -0700 |
| commit | 29c11aa8082b6dbef2cffbcd5e81be27e9b50a5b (patch) | |
| tree | eefb00f136148f550bbad6d8b82e4fe75b4215c5 /kernel/bpf/task_iter.c | |
| parent | bpf: Enable IRQ after irq_work_raise() completes in unit_free{_rcu}() (diff) | |
| download | linux-rng-29c11aa8082b6dbef2cffbcd5e81be27e9b50a5b.tar.xz linux-rng-29c11aa8082b6dbef2cffbcd5e81be27e9b50a5b.zip | |
selftests/bpf: Test preemption between bpf_obj_new() and bpf_obj_drop()
The test case creates 4 threads and then pins these 4 threads in CPU 0.
These 4 threads will run different bpf program through
bpf_prog_test_run_opts() and these bpf program will use bpf_obj_new()
and bpf_obj_drop() to allocate and free local kptrs concurrently.
Under preemptible kernel, bpf_obj_new() and bpf_obj_drop() may preempt
each other, bpf_obj_new() may return NULL and the test will fail before
applying these fixes as shown below:
test_preempted_bpf_ma_op:PASS:open_and_load 0 nsec
test_preempted_bpf_ma_op:PASS:attach 0 nsec
test_preempted_bpf_ma_op:PASS:no test prog 0 nsec
test_preempted_bpf_ma_op:PASS:no test prog 0 nsec
test_preempted_bpf_ma_op:PASS:no test prog 0 nsec
test_preempted_bpf_ma_op:PASS:no test prog 0 nsec
test_preempted_bpf_ma_op:PASS:pthread_create 0 nsec
test_preempted_bpf_ma_op:PASS:pthread_create 0 nsec
test_preempted_bpf_ma_op:PASS:pthread_create 0 nsec
test_preempted_bpf_ma_op:PASS:pthread_create 0 nsec
test_preempted_bpf_ma_op:PASS:run prog err 0 nsec
test_preempted_bpf_ma_op:PASS:run prog err 0 nsec
test_preempted_bpf_ma_op:PASS:run prog err 0 nsec
test_preempted_bpf_ma_op:PASS:run prog err 0 nsec
test_preempted_bpf_ma_op:FAIL:ENOMEM unexpected ENOMEM: got TRUE
#168 preempted_bpf_ma_op:FAIL
Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED
Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20230901111954.1804721-4-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/task_iter.c')
0 files changed, 0 insertions, 0 deletions