On Wed, 3 Aug 2016, Marc MERLIN wrote: > This happens on all kernels up to 4.7. > Sorry, it happens earlier than ethernet coming up or my storage, so I can't > use netconsole or other text dumps: > https://goo.gl/photos/ubsi6maZXsjkevYY7 > > Looks like the warning happens on the registration of one of my bcache, but > I can't tell which one or why. > > Does the trace give any hints? > (please ignore the load modules errors below, different issue) Does it cause a problem, or just warn? 73 uint8_t bch_inc_gen(struct cache *ca, struct bucket *b) 74 { 75 uint8_t ret = ++b->gen; 76 77 ca->set->need_gc = max(ca->set->need_gc, bucket_gc_gen(b)); 78 WARN_ON_ONCE(ca->set->need_gc > BUCKET_GC_GEN_MAX); 79 80 return ret; 81 } It looks like something needs garbage collected but perhaps isn't. You could write to sysfs/.../trigger_gc: https://evilpiepirate.org/git/linux-bcache.git/tree/Documentation/bcache.txt trigger_gc Writing to this file forces garbage collection to run. If that doesn't work, I wonder what increasing BUCKET_GC_GEN_MAX would do, though I don't know if that is safe. Its set to 96U, so its not on on a bit boundary which sounds like it could be slightly safer---but I wouldn't try it unless this is a test machine. -- Eric Wheeler > > Thanks, > Marc > -- > "A mouse is a device used to point at the xterm you want to type in" - A.S.R. > Microsoft is to operating systems .... > .... what McDonalds is to gourmet cooking > Home page: http://marc.merlins.org/ > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
