August 24, 2017 9:37 PM, "Eric Wheeler" [off-list ref] wrote:

quoted

A fast fix can be:

@@ -404,7 +404,8 @@ long bch_bucket_alloc(struct cache *ca, unsigned

reserve, bool wait)

finish_wait(&ca->set->bucket_wait, &w);
out:
- wake_up_process(ca->alloc_thread);
+ if (ca->alloc_thread)
+ wake_up_process(ca->alloc_thread);

trace_bcache_alloc(ca, reserve);

But for a proper fix, we should not open user space access interface
before necessary resources are ready.

Great catch!

Jorg, does this fix it?

Hi!

I hopefully find some time over the weekend and try it -- it's a bit painful because the machine is
headless and I have to move a monitor around to see the results...


   j