Re: [PATCH bpf-next v3 1/2] bpf: Implement dtor for struct file BTF ID

On Fri, Apr 24, 2026 at 4:20 PM Justin Suess <[email protected]> wrote:
>
>
> So either:
>
> 1. allocating memory for a new irq_work on the fly, which is an
> operation that can fail. So if we're under memory pressure the
> element never gets freed.
>
> 2. preallocate an irq work for every element ahead of time.

obviously that's not what I was referring to.
irq_work is rarely used directly like that.
The common pattern is:
defer_free()
{
        if (llist_add(head + s->offset, &df->objects))
                irq_work_queue(&df->work);

but before going there.
Please enumerate "other dtors broken in NMI".
What exactly is broken?
What is the sequence of events?
All map types with kptrs? or particular ones?