Re: [PATCH] io_uring/io-wq: fix worker accounting when canceling creation callbacks

On Tue, 11 Aug 2026 00:01:27 -0700, Vishnu Razdan wrote:
> create_worker_cb() reserves an io-wq worker slot only after its
> task-work callback runs. If the callback is canceled before then,
> io_worker_cancel_cb() still decrements acct->nr_workers. When an
> existing worker retires with its creation callback pending, that
> worker has already decremented the same account's worker count.
> 
> The resulting undercount permits worker creation beyond the account's
> configured limit. On an AST2600 OpenBMC system, an unchanged sensor
> daemon reached 4,291 threads with the original kernel. With an
> equivalent downstream fix, 25 passive samples under its normal
> workload showed 6-9 threads.
> 
> [...]

Applied, thanks!

[1/1] io_uring/io-wq: fix worker accounting when canceling creation callbacks
      commit: 297b5ccea4acacaa47c150f043bce695202afbf1

Best regards,
-- 
Jens Axboe