From: Matt Fleming <mfleming@xxxxxxxxxxxxxx> Calls to kfree() in trie_free() can be expensive for KASAN-enabled kernels. This can cause soft lockup warnings when traversing large maps, watchdog: BUG: soft lockup - CPU#41 stuck for 76s! [kworker/u518:14:1158211] Avoid an unbounded loop and periodically check whether we should reschedule. Signed-off-by: Matt Fleming <mfleming@xxxxxxxxxxxxxx> --- kernel/bpf/lpm_trie.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c index be66d7e520e0..a35619cd99f6 100644 --- a/kernel/bpf/lpm_trie.c +++ b/kernel/bpf/lpm_trie.c @@ -646,6 +646,8 @@ static void trie_free(struct bpf_map *map) RCU_INIT_POINTER(*slot, NULL); break; } + + cond_resched(); } out: -- 2.34.1
