----- Ursprüngliche Mail ----- > Von: "Slava Pestov" <sp@xxxxxxxxx> > An: "Thomas Klaube" <thomas@xxxxxxxxxx> > CC: "Kent Overstreet" <kmo@xxxxxxxxxxxxx>, linux-bcache@xxxxxxxxxxxxxxx > Gesendet: Sonntag, 31. August 2014 22:34:52 > Betreff: Re: bcache bug / fs freeze on heavy IO > > Hi Thomas, Hi Slava, > > Aug 26 01:52:06 ubuntu kernel: [18378.656038] BUG: unable to handle kernel > > NULL pointer dereference at 0000000000000099 > > I believe this is fixed in 3.17: > > http://evilpiepirate.org/git/linux-bcache.git/commit/?h=bcache-dev&id=2452cc89063a2a6890368f185c4b6d7d8802179e > > Can you either try upgrading your kernel, or as a workaround try > increasing your bucket size. This will lower the btree depth (depth 2 > trees won't hit this problem). I upgraded to 3.17.0-rc3 and rerun the fio tests for 10 hours without any problems (no suspect messages in dmesg, no fs errors and no hanging tasks or other problems). So it seems I am unable to trigger the problem in 3.17.0-rc3 but I will perform some more tests.... Thanx and regards Thomas Klaube -- 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
