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Message-ID: <4DDC38FE.5010700@kernel.org> Date: Tue, 24 May 2011 16:02:22 -0700 From: Yinghai Lu <yinghai@...nel.org> To: Alex Williamson <alex.williamson@...hat.com> CC: David Woodhouse <dwmw2@...radead.org>, Vinod Koul <vinod.koul@...el.com>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, Jesse Barnes <jbarnes@...tuousgeek.org>, iommu@...ts.linux-foundation.org, Dan Williams <dan.j.williams@...el.com>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH] pci, dmar: Update dmar units devices list during hotplug On 05/24/2011 03:38 PM, Alex Williamson wrote: > On Tue, 2011-05-24 at 14:45 -0700, Yinghai Lu wrote: >> No, it does not work. > > I didn't say this wasn't without some effort, just thought it might give > you a jump start. ok, let me debug it tonight. looks like that pdev is not freed, but already get removed from the device tree. may need to pass pci_dev pointer directly. > > Alex > >> [ 592.792864] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 >> [ 592.793279] IP: [<ffffffff8136271a>] dmar_match_scope+0x27/0xb6 >> [ 592.804488] PGD 0 >> [ 592.804629] Oops: 0000 [#1] SMP >> [ 592.804849] CPU 1 >> [ 592.804947] Modules linked in: >> [ 592.824426] >> [ 592.824521] Pid: 14498, comm: kworker/u:7 Tainted: G W 2.6.39-tip-yh-06738-g5d55a15-dirty #1043 Oracle Corporation Sun Fire X4800 M2 / >> [ 592.844637] RIP: 0010:[<ffffffff8136271a>] [<ffffffff8136271a>] dmar_match_scope+0x27/0xb6 >> [ 592.864410] RSP: 0018:ffff881ffce45a70 EFLAGS: 00010293 >> [ 592.864673] RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000000 >> [ 592.884403] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88fffeef6000 >> [ 592.904205] RBP: ffff881ffce45ab0 R08: 0000000000000000 R09: 0000000000000000 >> [ 592.904535] R10: 0000000000000000 R11: ffff88dffedda320 R12: 0000000000000000 >> [ 592.924419] R13: 0000000000000000 R14: ffff88fffeef6000 R15: 0000000000000000 >> [ 592.924748] FS: 0000000000000000(0000) GS:ffff88207d800000(0000) knlGS:0000000000000000 >> [ 592.944447] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b >> [ 592.964196] CR2: 0000000000000010 CR3: 00000000023cb000 CR4: 00000000000006e0 >> [ 592.964541] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> [ 592.984308] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 >> [ 593.004091] Process kworker/u:7 (pid: 14498, threadinfo ffff881ffce44000, task ffff881ffce3c560) >> [ 593.004492] Stack: >> [ 593.024051] ffff881ffce45a80 ffffffff8134bf6a ffff881ffce45ab0 ffff88407d002640 >> [ 593.024479] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 >> [ 593.044272] ffff881ffce45ae0 ffffffff81363e4a ffff881ffce45b00 ffff88dffe1c1d00 >> [ 593.064027] Call Trace: >> [ 593.064156] [<ffffffff8134bf6a>] ? pci_get_device+0x16/0x18 >> [ 593.064441] [<ffffffff81363e4a>] device_to_iommu+0x4c/0x77 >> [ 593.084054] [<ffffffff81364163>] domain_remove_one_dev_info+0x39/0x1fc >> [ 593.084361] [<ffffffff8136637f>] device_notifier+0x52/0x78 >> [ 593.104093] [<ffffffff81c24cc3>] notifier_call_chain+0x68/0x9f >> [ 593.123814] [<ffffffff81193710>] ? sysfs_schedule_callback+0x1df/0x1df >> [ 593.124125] [<ffffffff8109f209>] __blocking_notifier_call_chain+0x4c/0x61 >> [ 593.143899] [<ffffffff8109f232>] blocking_notifier_call_chain+0x14/0x16 >> [ 593.144207] [<ffffffff81414909>] __device_release_driver+0xcd/0xd2 >> [ 593.163934] [<ffffffff81414933>] device_release_driver+0x25/0x32 >> [ 593.164222] [<ffffffff814144bd>] bus_remove_device+0x8e/0x9f >> [ 593.183934] [<ffffffff8141255e>] device_del+0x130/0x17f >> [ 593.184186] [<ffffffff814125c3>] device_unregister+0x16/0x23 >> [ 593.203888] [<ffffffff813473e5>] pci_stop_bus_device+0x61/0x83 >> [ 593.223661] [<ffffffff8134c88a>] ? remove_callback+0x1f/0x3c >> [ 593.223932] [<ffffffff813473b4>] pci_stop_bus_device+0x30/0x83 >> [ 593.243652] [<ffffffff81347470>] pci_remove_bus_device+0x1a/0xba >> [ 593.243955] [<ffffffff8134c896>] remove_callback+0x2b/0x3c >> [ 593.263631] [<ffffffff8119372c>] sysfs_schedule_callback_work+0x1c/0x5f >> [ 593.263962] [<ffffffff8109433b>] process_one_work+0x231/0x3e6 >> [ 593.283667] [<ffffffff810942ac>] ? process_one_work+0x1a2/0x3e6 >> [ 593.283958] [<ffffffff81094829>] worker_thread+0x17c/0x240 >> [ 593.303651] [<ffffffff810add32>] ? trace_hardirqs_on+0xd/0xf >> [ 593.303927] [<ffffffff810946ad>] ? manage_workers+0xab/0xab >> [ 593.323617] [<ffffffff81099ea5>] kthread+0xa0/0xa8 >> [ 593.323845] [<ffffffff810adbcc>] ? trace_hardirqs_on_caller+0x1f/0x178 >> [ 593.343620] [<ffffffff81c29614>] kernel_thread_helper+0x4/0x10 >> [ 593.343888] [<ffffffff81c218c4>] ? _raw_spin_unlock_irq+0x30/0x36 >> [ 593.363642] [<ffffffff810add32>] ? trace_hardirqs_on+0xd/0xf >> [ 593.383357] [<ffffffff81c21bc0>] ? retint_restore_args+0xe/0xe >> [ 593.383624] [<ffffffff81099e05>] ? __init_kthread_worker+0x5b/0x5b >> [ 593.403441] [<ffffffff81c29610>] ? gs_change+0xb/0xb >> [ 593.403667] Code: 41 5f c9 c3 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 18 66 66 66 66 90 45 31 ed 89 f3 49 89 d4 49 89 fe 44 0f b7 f9 eb 72 >> [ 593.424146] 8b 44 24 10 49 8b 16 48 8b 80 88 00 00 00 44 3b 38 75 57 48 >> [ 593.443684] RIP [<ffffffff8136271a>] dmar_match_scope+0x27/0xb6 >> [ 593.443968] RSP <ffff881ffce45a70> >> [ 593.463319] CR2: 0000000000000010 >> [ 593.463510] ---[ end trace 75ddbb3d94414ea9 ]--- >> [ 593.465841] BUG: unable to handle kernel >> > > -- 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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