Re: [PATCH v3 0/7] efi/runtime-wrappers: bound the wait for EFI runtime service calls

[Ard Biesheuvel]

On Wed, 1 Jul 2026, at 15:28, Breno Leitao wrote:
> Hello Ard,
>
> On Tue, Jun 16, 2026 at 05:09:33AM -0700, Breno Leitao wrote:
>> When an EFI runtime service call hangs in firmware, the kworker on
>> efi_rts_wq is stuck inside the firmware call and cannot be cancelled.
>> The kernel currently waits indefinitely on the completion, and the
>> caller holds efi_runtime_lock for the duration, so every subsequent
>> EFI runtime caller (efivarfs, NVRAM writes, set_wakeup_time, ACPI PRM
>> handlers, ...) is wedged until reboot. The only externally visible
>> symptom is a "workqueue lockup" message and userspace processes
>> piling up uninterruptibly on the semaphore.
>
> I'd appreciate your thoughts on this approach. Is there anything you'd
> like me to adjust or improve before we move forward?
>

This looks fine now, apologies for the delayed response.

I've queued this up for v7.3