Re: [PATCHv2 bpf-next 1/9] uprobe: Add support for session consumer

[Peter Zijlstra]

On Mon, Jul 01, 2024 at 06:41:07PM +0200, Jiri Olsa wrote:

> +static void
> +uprobe_consumer_account(struct uprobe *uprobe, struct uprobe_consumer *uc)
> +{
> +	static unsigned int session_id;
> +
> +	if (uc->session) {
> +		uprobe->sessions_cnt++;
> +		uc->session_id = ++session_id ?: ++session_id;
> +	}
> +}

The way I understand this code, you create a consumer every time you do
uprobe_register() and unregister makes it go away.

Now, register one, then 4g-1 times register+unregister, then register
again.

The above seems to then result in two consumers with the same
session_id, which leads to trouble.

Hmm?