From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gabriel de Perthuis Subject: Re: [BUG] unable to handle kernel NULL pointer dereference at 000000000000006c (bch_insert_data) Date: Mon, 14 Oct 2013 14:38:12 +0200 Message-ID: <525BE5B4.6000003@gmail.com> References: <1381699461.2306.6.camel@ThinkPad-X230.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1381699461.2306.6.camel-aTCQVLFAsbFNyYP8qUDXA8/Rnsmy/zvw/z7RTEddyNg@public.gmane.org> Sender: linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Igor Gnatenko , linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-bcache@vger.kernel.org > On testday we found: https://bugzilla.redhat.com/show_bug.cgi?id=1018615 > which have dmesg after sysrq-t (also have some lines down). > We setted cache_mode to writeback, mounted to foldear and started copy > files to mounted bcache folder. It was copied some % and stayed. > We running 3.11.4 kernel, which have fix for flushing data. > > [ 1550.135293] BUG: unable to handle kernel NULL pointer dereference at 000000000000006c > [ 1550.135335] IP: [] bch_insert_data+0x19/0x30 [bcache] That's the bug mentioned here: http://comments.gmane.org/gmane.linux.kernel.bcache.devel/2113 http://comments.gmane.org/gmane.linux.kernel.bcache.devel/2109 http://comments.gmane.org/gmane.linux.kernel.bcache.devel/2108 It's a regression that stops writeback and made 3.11.4. The fix is in 3.12-rc5 and will be in 3.11.5.