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Message-ID: <4FA345DA4F4AE44899BD2B03EEEC2FA9119886EE@SACEXCMBX04-PRD.hq.netapp.com> Date: Thu, 3 Jan 2013 22:12:32 +0000 From: "Myklebust, Trond" <Trond.Myklebust@...app.com> To: Tejun Heo <tj@...nel.org> CC: "J. Bruce Fields" <bfields@...ldses.org>, "Adamson, Dros" <Weston.Adamson@...app.com>, Dave Jones <davej@...hat.com>, Linux Kernel <linux-kernel@...r.kernel.org>, "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org> Subject: Re: nfsd oops on Linus' current tree. On Thu, 2013-01-03 at 17:08 -0500, Tejun Heo wrote: > Hello, > > On Thu, Jan 03, 2013 at 03:11:20PM -0500, J. Bruce Fields wrote: > > Both rpciod and nfsiod already set WQ_MEM_RECLAIM. > > > > But, right, looking at kernel/workqueue.c, it seems that the dedicated > > "rescuer" threads are invoked only in the case when work is stalled > > because a new worker thread isn't allocated quickly enough. > > Because that's the *only* case where progress can't be guaranteed > otherwise. > > > So, what to do that's simplest enough that it would work for > > post-rc2/stable? I was happy having just a simple dedicated > > thread--these are only started when nfsd is, so there's no real thread > > proliferation problem. > > The analysis is likely completely wrong, so please don't go off doing > something unnecessary. Please take look at what's causing the > deadlocks again. The analysis is a no-brainer: We see a deadlock due to one work item waiting for completion of another work item that is queued on the same CPU. There is no other dependency between the two work items. -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@...app.com www.netapp.com -- 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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