libbpf: Fix race when pinning maps in parallel

When loading in parallel multiple programs which use the same to-be
pinned map, it is possible that two instances of the loader will call
bpf_object__create_maps() at the same time. If the map doesn't exist
when both instances call bpf_object__reuse_map(), then one of the
instances will fail with EEXIST when calling bpf_map__pin().

Fix the race by retrying reusing a map if bpf_map__pin() returns
EEXIST. The fix is similar to the one in iproute2: e4c4685fd6e4 ("bpf:
Fix race condition with map pinning").

Before retrying the pinning, we don't do any special cleaning of an
internal map state. The closer code inspection revealed that it's not
required:

    - bpf_object__create_map(): map->inner_map is destroyed after a
      successful call, map->fd is closed if pinning fails.
    - bpf_object__populate_internal_map(): created map elements is
      destroyed upon close(map->fd).
    - init_map_slots(): slots are freed after their initialization.

Signed-off-by: Martynas Pumputis <m@lambda.lt>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210726152001.34845-1-m@lambda.lt

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 6c68346..a1ca6fb 100644 (file)
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4657,10 +4657,13 @@ bpf_object__create_maps(struct bpf_object *obj)
        char *cp, errmsg[STRERR_BUFSIZE];
        unsigned int i, j;
        int err;
+       bool retried;
 
        for (i = 0; i < obj->nr_maps; i++) {
                map = &obj->maps[i];
 
+               retried = false;
+retry:
                if (map->pin_path) {
                        err = bpf_object__reuse_map(map);
                        if (err) {
@@ -4668,6 +4671,12 @@ bpf_object__create_maps(struct bpf_object *obj)
                                        map->name);
                                goto err_out;
                        }
+                       if (retried && map->fd < 0) {
+                               pr_warn("map '%s': cannot find pinned map\n",
+                                       map->name);
+                               err = -ENOENT;
+                               goto err_out;
+                       }
                }
 
                if (map->fd >= 0) {
@@ -4701,9 +4710,13 @@ bpf_object__create_maps(struct bpf_object *obj)
                if (map->pin_path && !map->pinned) {
                        err = bpf_map__pin(map, NULL);
                        if (err) {
+                               zclose(map->fd);
+                               if (!retried && err == -EEXIST) {
+                                       retried = true;
+                                       goto retry;
+                               }
                                pr_warn("map '%s': failed to auto-pin at '%s': %d\n",
                                        map->name, map->pin_path, err);
-                               zclose(map->fd);
                                goto err_out;
                        }
                }