Re: [syzbot] [net?] WARNING in stack_depot_save_flags (2)

[syzbot <syzbot+1827030ed7bc886dd0a5@syzkaller.appspotmail.com>]

> #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Patch testing via #syz test is temporarily disabled.
See https://github.com/google/syzkaller/issues/8122 for details.

>
> diff --git a/lib/stackdepot.c b/lib/stackdepot.c
> index 90c52f2e0d3f4..da4dba8b40bd3 100644
> --- a/lib/stackdepot.c
> +++ b/lib/stackdepot.c
> @@ -299,7 +299,13 @@ static bool depot_init_pool(void **prealloc)
>  		/* Bail out if we reached the pool limit. */
>  		WARN_ON_ONCE(pools_num > stack_max_pools); /* should never happen */
>  		WARN_ON_ONCE(!new_pool); /* to avoid unnecessary pre-allocation */
> -		WARN_ONCE(1, "Stack depot reached limit capacity");
> +		/*
> +		 * Exhaustion is a handled resource limit, not a bug:
> +		 * all users cope with a failed save, and privileged workloads
> +		 * (e.g. BPF JIT churning unique stacks under KASAN) can reach
> +		 * it legitimately. Keep a one-time notice, not a WARN() splat.
> +		 */
> +		pr_warn_once("Stack depot reached limit capacity");
>  		return false;
>  	}
>