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Re: ath9k: hwrng blocks for several minutes when phy is un-associated

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Hey Gregory,

On Fri, Jun 24, 2022 at 1:36 AM Gregory Erwin <gregerwin256@xxxxxxxxx> wrote:
>
> No luck.
>
> The first patch caused a warning and oops with ath9k_rng_read() at the
> top of the call stack when reading from /dev/hwrng:
>   WARNING: CPU: 1 PID: 454 at kernel/kthread.c:75 kthread_should_stop+0x2a/0x30
>   BUG: kernel NULL pointer dereference, address: 0000000000000000
>
> The second didn't have a noticeable effect, for better or worse.

Alright. That's actually getting us somewhere. So the path in question
here is from reading /dev/hwrng, not from the kthread that's doing the
same read.

Can you do a `cat /dev/hwrng > /dev/null`, and then do whatever it is
you do that causes everything to hang, and then while things are hung
in the bad way, look at the contents of /proc/[the pid of the cat you
just ran]/stack?

Jason



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