Re: [PATCH v3] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512

[Catalin Marinas]

On Wed, Mar 13, 2024 at 05:13:33PM +0000, Russell King wrote:
> So, I wonder whether what you're seeing is a latent bug which is
> being tickled by the presence of the CPU masks being off-stack
> changing the kernel timing.
> 
> I would suggest the printk debug approach may help here to see when
> the OPPs are begun to be parsed, when they're created etc and their
> timing relationship to being used. Given the suspicion, it's possible
> that the mere addition of printk() may "fix" the problem, which again
> would be another semi-useful data point.

It might be an init order problem. Passing "initcall_debug" on the
cmdline might help a bit.

It would also be useful in dev_pm_opp_set_config(), in the WARN_ON
block, to print opp_table->opp_list.next to get an idea whether it looks
like a valid pointer or memory corruption.

-- 
Catalin