From: "Torsten Kaiser" Subject: Re: [NFS] [BUG] 2.6.24-rc2-mm1 - kernel bug on nfs v4 Date: Sat, 17 Nov 2007 20:40:22 +0100 Message-ID: <64bb37e0711171140w5f1451e0qea081a4fbc7a45f7__11182.1653358222$1195332540$gmane$org@mail.gmail.com> References: <473DA608.1020804@linux.vnet.ibm.com> <64bb37e0711170953p67d1be49lf4eaa190d662e2b4@mail.gmail.com> <20071117180946.GA14055@elte.hu> <20071117101957.7562639d.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Trond Myklebust , Peter Zijlstra , LKML , Kamalesh Babulal , linuxppc-dev-mnsaURCQ41sdnm+yROfE0A@public.gmane.org, nfs@lists.sourceforge.net, Andy Whitcroft , Ingo Molnar , Jan Blunck , Balbir Singh To: "Andrew Morton" Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1ItTWf-0003JZ-A7 for nfs@lists.sourceforge.net; Sat, 17 Nov 2007 11:40:22 -0800 Received: from py-out-1112.google.com ([64.233.166.177]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1ItTWk-0003tZ-T5 for nfs@lists.sourceforge.net; Sat, 17 Nov 2007 11:40:27 -0800 Received: by py-out-1112.google.com with SMTP id a25so1954226pyi for ; Sat, 17 Nov 2007 11:40:25 -0800 (PST) In-Reply-To: <20071117101957.7562639d.akpm@linux-foundation.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Nov 17, 2007 7:19 PM, Andrew Morton wrote: > > On Sat, 17 Nov 2007 19:09:46 +0100 Ingo Molnar wrote: > > > > > * Torsten Kaiser wrote: > > > > > Sadly lockdep does not work for me, as it gets turned off early: > > > [ 39.851594] --------------------------------- > > > [ 39.855963] inconsistent {softirq-on-W} -> {in-softirq-W} usage. > > > [ 39.861981] swapper/0 [HC0[0]:SC1[1]:HE0:SE0] takes: > > > [ 39.866963] (&n->list_lock){-+..}, at: [] > > > > hey, that means it found a bug - which is not sad at all :-) It was sad, that it found a bug that I was not searching for. ;) > mutter. > > Torsten, you could try CONFIG_SLAB=y, CONFIG_SLUB=n to see if you can make > some progress on the NFS problem. I should had thought of that myself... OK anyway here is the result: The hang is reproducable, emerge froze the system again after download the source. Lockdep triggers immedetly before the freeze, but the result is still not helpful: [ 221.565011] INFO: trying to register non-static key. [ 221.566999] the code is fine but needs lockdep annotation. [ 221.569206] turning off the locking correctness validator. [ 221.571404] [ 221.571405] Call Trace: [ 221.572996] [] __lock_acquire+0x4c4/0x1140 [ 221.575298] [] lock_acquire+0x55/0x70 [ 221.577429] [] __wake_up+0x2d/0x70 [ 221.579457] [] _spin_lock_irqsave+0x34/0x50 [ 221.581800] [] _spin_unlock_irqrestore+0x55/0x70 [ 221.584317] [] __wake_up+0x2d/0x70 [ 221.586344] [] rpc_async_schedule+0x0/0x10 [ 221.588648] [] nfs_free_unlinkdata+0x1e/0x50 [ 221.591023] [] rpc_release_calldata+0x26/0x50 [ 221.593428] [] run_workqueue+0x16f/0x210 [ 221.595662] [] trace_hardirqs_on+0xc1/0x160 [ 221.598004] [] worker_thread+0x0/0xb0 [ 221.600130] [] worker_thread+0x0/0xb0 [ 221.602265] [] worker_thread+0x6d/0xb0 [ 221.604431] [] autoremove_wake_function+0x0/0x30 [ 221.606939] [] worker_thread+0x0/0xb0 [ 221.609067] [] worker_thread+0x0/0xb0 [ 221.611199] [] kthread+0x4b/0x80 [ 221.613156] [] child_rip+0xa/0x12 [ 221.615151] [] restore_args+0x0/0x30 [ 221.617247] [] kthread+0x0/0x80 [ 221.619162] [] child_rip+0x0/0x12 [ 221.621147] [ 221.621749] INFO: lockdep is turned off. [ 226.369259] SysRq : Emergency Sync [ 226.331342] Emergency Sync complete [ 227.064545] SysRq : Emergency Remount R/O [ 228.193491] SysRq : Emergency Sync [ 228.155593] Emergency Sync complete [ 228.767931] SysRq : Resetting I also had another BUG output during system startup, but that should be unrelated: [ 103.254681] BUG: sleeping function called from invalid context at kernel/rwsem.c:20 [ 103.257757] in_atomic():0, irqs_disabled():1 [ 103.259469] 1 lock held by artsd/5883: [ 103.259470] #0: (pm_qos_lock){....}, at: [] pm_qos_add_requirement+0x6b/0xf0 [ 103.263316] irq event stamp: 49712 [ 103.263318] hardirqs last enabled at (49711): [] __kmalloc+0x10d/0x180 [ 103.263321] hardirqs last disabled at (49712): [] _spin_lock_irqsave+0x1a/0x50 [ 103.263326] softirqs last enabled at (48820): [] unix_release_sock+0x79/0x240 [ 103.263330] softirqs last disabled at (48818): [] _write_lock_bh+0x9/0x30 [ 103.263333] [ 103.263333] Call Trace: [ 103.263335] [] down_read+0x15/0x40 [ 103.263338] [] __blocking_notifier_call_chain+0x46/0x90 [ 103.263341] [] pm_qos_add_requirement+0x93/0xf0 [ 103.263344] [] snd_pcm_hw_params+0x2fa/0x380 [ 103.263347] [] snd_pcm_common_ioctl1+0xb4c/0xdc0 [ 103.263350] [] __do_fault+0x227/0x470 [ 103.263353] [] __lock_acquire+0x745/0x1140 [ 103.263357] [] _spin_unlock_irqrestore+0x55/0x70 [ 103.263359] [] trace_hardirqs_on+0xc1/0x160 [ 103.263362] [] snd_pcm_playback_ioctl1+0x48/0x240 [ 103.263365] [] snd_pcm_playback_ioctl+0x36/0x50 [ 103.263367] [] vfs_ioctl+0x2f/0xa0 [ 103.263369] [] do_vfs_ioctl+0x260/0x2e0 [ 103.263371] [] trace_hardirqs_on+0xc1/0x160 [ 103.263373] [] sys_ioctl+0x91/0xb0 [ 103.263376] [] system_call+0x7e/0x83 [ 103.263379] Torsten ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. 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