Re: [PATCH v2 14/30] cxlflash: Fix to avoid stall while waiting on TMF

On Sep 21, 2015, at 1:24 PM, Brian King [off-list ref] wrote:
On 09/16/2015 04:30 PM, Matthew R. Ochs wrote:

quoted

Borrowing the TMF waitq's spinlock causes a stall condition when
waiting for the TMF to complete. To remedy, introduce our own spin
lock to serialize TMF and use the appropriate wait services.

Can you clarify what stall condition you were seeing. Its not obvious
to me what this fixes. Do you have soft lockup logs from the failure?

I believe we saw cascading RCU stalls.

I couldn't find any more details in my notes or development commits.
Unfortunately the logs are long gone as this was fixed in June.