On Thu, Nov 24, 2016 at 02:06:57PM +0800, miaoqing at codeaurora.org wrote:

quoted

quoted

Okay, so i was 0, so running UP probably isn't going to help.  r7 is
also spec_priv->rfs_chan_spec_scan.

So, I think the question is... how is this NULL - and has it always
been NULL...

The problem appears to be that ath_cmn_process_fft() isn't called that
often.  When it is, it crashes in ath_cmn_is_fft_buf_full() because
spec_priv->rfs_chan_spec_scan is NULL when ATH9K_DEBUGFS=n. :-(

I'm running with ATH9K_DEBUGFS=y now.  If it goes a couple of days
without crashing, I'll gin up a patch.

A similar patch was applied to ath-next branch:
https://patchwork.kernel.org/patch/9431163/.

Hmm.  Ok, I'm giving it a spin on my board with SMP=y, ATH9K_DEBUGFS=n
(so the only change from known crashing is the patch) and we'll see how
it goes.

Honestly, though, I think the real problem is when kernels are built
without ATH9K_DEBUGFS.  Did the reporter of the crash say if that was
enabled on his system or not?

I'm concerned that there may be other code lurking that secretly depends
on ATH9K_DEBUGFS being enabled.

thx,

Jason.