Re: spinlock recursion when running q800 emulation in qemu

Finn Thain
2024-03-09T22:17:16Z

On Sun, 10 Mar 2024, Michael Schmitz wrote:

> But I've now got this in ARAnyM:
>
> BUG: spinlock recursion on CPU#0, pool_workqueue_/3
> ...

OK. I am unable to reproduce the BUG, unfortunately.

>
> mfp_timer_c_hander() has a local_irq_save() / local_irq_restore() pair
> around the legacy_timer_tick() invocation so this spinlock recursion
> does appear to work even without reentering the scheduling timer routine
>

IIUC it is not spinlock usage that's at issue. IIUC the problem is either
the implementation of the locking primitives or the tests to verify their
properties.