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Date: Wed, 30 Jul 2014 19:53:15 -0700 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Fengguang Wu <fengguang.wu@...el.com> Cc: David Rientjes <rientjes@...gle.com>, Christoph Hellwig <hch@...radead.org>, Al Viro <viro@...iv.linux.org.uk>, Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>, Yuanhan Liu <yuanhan.liu@...el.com>, linux-fsdevel@...r.kernel.org, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [delayed_fput] BUG: unable to handle kernel paging request at ffff8800122a0ad0 On Wed, Jul 30, 2014 at 7:40 PM, Fengguang Wu <fengguang.wu@...el.com> wrote: > On Wed, Jul 30, 2014 at 04:00:58PM -0700, Alexei Starovoitov wrote: >> On Wed, Jul 30, 2014 at 3:51 PM, David Rientjes <rientjes@...gle.com> wrote: >> > On Wed, 30 Jul 2014, Christoph Hellwig wrote: >> > >> >> On Wed, Jul 30, 2014 at 11:55:41AM +0800, Fengguang Wu wrote: >> >> > Greetings, >> >> > >> >> > 0day kernel testing robot got the below dmesg and the first bad commit is >> >> >> >> How does this manage to trip over a 2 year old commit now? >> >> may be because all kernels are built with gcc 4.8.2 ? >> Fengguang, did you recently switch to new compiler? >> I think all older builds were with 4.6.3 > > Alexei, I've been using gcc 4.8.2 for 4 months. > > Maybe it's because I test new randconfigs every day. And the problem > may only show up with very specific kernel config? It seems a lot of odd crashes suddenly showed up and I'm guessing it may be related to compiler... See commit 2062afb4f8 ("Fix gcc-4.9.0 miscompilation of load_balance() in scheduler") it's a nasty gcc bug that affects 4.9 and 4.8. I think it makes sense to apply that workaround before debugging much with 4.8 just to eliminate the possibility of miscompiled code. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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