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Message-ID: <20131115115235.GA2281@intel.com> Date: Fri, 15 Nov 2013 13:52:35 +0200 From: Mika Westerberg <mika.westerberg@...ux.intel.com> To: Bjorn Helgaas <bhelgaas@...gle.com> Cc: Yinghai Lu <yinghai@...nel.org>, Andreas Noever <andreas.noever@...il.com>, Matthew Garrett <mjg59@...f.ucam.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Rafael J. Wysocki" <rjw@...k.pl>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Subject: Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list_scan On Thu, Oct 24, 2013 at 09:33:50PM -0600, Bjorn Helgaas wrote: > On Wed, Oct 23, 2013 at 11:53 PM, Yinghai Lu <yinghai@...nel.org> wrote: > > On Tue, Oct 22, 2013 at 8:32 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote: > >> On Thu, Oct 17, 2013 at 7:59 AM, Andreas Noever <andreas.noever@...il.com> wrote: > >>> On Wed, Oct 16, 2013 at 10:21 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote: > >>>> On Tue, Oct 15, 2013 at 03:44:52AM +0100, Matthew Garrett wrote: > >>>>> On Mon, Oct 14, 2013 at 05:50:38PM -0600, Bjorn Helgaas wrote: > >>>>> > On Mon, Oct 14, 2013 at 4:47 PM, Andreas Noever <andreas.noever@...il.com> wrote: > >>>>> > > When I unplug the Thunderbolt ethernet adapter on my MacBookPro Linux > >>>>> > > crashes a few seconds later. Using > >>>>> > > echo 1 > /sys/bus/pci/devices/0000:08:00.0/remove > >>>>> > > to remove a bridge two levels above the device triggers the fault immediately: > > >>>> We save a pci_dev pointer in the pci_pme_list, which of course has a > >>>> longer lifetime than the pci_dev itself, but we don't acquire a reference > >>>> on it, so I suspect the pci_dev got released before we got around to > >>>> doing the pci_pme_list_scan(). > >>>> > >>>> Andreas, can you try the patch below? It's against v3.12-rc2, but it > >>>> should apply to v3.11, too. > >>> > >>> I have tested your patch against 3.11 where it solves the problem. Thanks! > >>> > >>> Unfortunately I could not reproduce the problem in 3.12-rc5. I only > >>> get the following warning (and no crash): > >>> > >>> tg3 0000:0a:00.0: PME# disabled > >>> pcieport 0000:09:00.0: PME# disabled > >>> pciehp 0000:09:00.0:pcie24: unloading service driver pciehp > >>> pci_bus 0000:0a: dev 00, dec refcount to 0 > >>> pci_bus 0000:0a: dev 00, released physical slot 9 > >>> ------------[ cut here ]------------ > >>> WARNING: CPU: 0 PID: 122 at drivers/pci/pci.c:1430 > >>> pci_disable_device+0x84/0x90() > >>> Device pcieport > >>> disabling already-disabled device > >>> ... > > >>> Bisection points to 928bea964827d7824b548c1f8e06eccbbc4d0d7d . > >> > >> This is "PCI: Delay enabling bridges until they're needed" by Yinghai. > > > > that double disabling should be addressed by: > > > > https://lkml.org/lkml/2013/4/25/608 > > > > [PATCH] PCI: Remove duplicate pci_disable_device for pcie port > > I'll look at that patch again. I had some questions about it the > first time, but perhaps it makes more sense after 928bea9648 has been > applied. Bjorn, Are there any plans to apply the above patch? I'm seeing that warning on all my TBT test machines: [ 122.914180] pcieport 0000:06:05.0: PME# disabled [ 122.915386] ------------[ cut here ]------------ [ 122.916513] WARNING: CPU: 0 PID: 1060 at drivers/pci/pci.c:1430 pci_disable_device+0x7c/0x90() [ 122.917589] Device pcieport [ 122.917589] disabling already-disabled device [ 122.918681] Modules linked in: [ 122.920803] CPU: 0 PID: 1060 Comm: kworker/0:2 Not tainted 3.12.0 #193 [ 122.921877] Hardware name: /D33217CK, BIOS GKPPT10H.86A.0042.2013.0422.1439 04/22/2013 [ 122.922989] Workqueue: kacpi_hotplug hotplug_event_work [ 122.924097] 0000000000000009 ffff88006de81ab0 ffffffff817ca961 ffff88006de81af8 [ 122.925241] ffff88006de81ae8 ffffffff810445c8 ffff88006ea15800 ffff88006ea15800 [ 122.926385] ffffffff81c5ac80 ffff88006ea14098 ffff88006eb35c28 ffff88006de81b48 [ 122.927519] Call Trace: [ 122.928626] [<ffffffff817ca961>] dump_stack+0x45/0x56 [ 122.929757] [<ffffffff810445c8>] warn_slowpath_common+0x78/0xa0 [ 122.930884] [<ffffffff81044637>] warn_slowpath_fmt+0x47/0x50 [ 122.932003] [<ffffffff812deb3d>] ? do_pci_disable_device+0x4d/0x60 [ 122.933116] [<ffffffff812debcc>] pci_disable_device+0x7c/0x90 [ 122.934235] [<ffffffff812ebfb5>] pcie_portdrv_remove+0x15/0x20 [ 122.935345] [<ffffffff812e0318>] pci_device_remove+0x28/0x60 [ 122.936442] [<ffffffff81424f24>] __device_release_driver+0x64/0xd0 [ 122.937543] [<ffffffff81424fae>] device_release_driver+0x1e/0x30 [ 122.938636] [<ffffffff81424837>] bus_remove_device+0xf7/0x140 [ 122.939718] [<ffffffff81421575>] device_del+0x135/0x1d0 [ 122.940806] [<ffffffff812db4c4>] pci_stop_bus_device+0x94/0xa0 [ 122.941890] [<ffffffff812db46b>] pci_stop_bus_device+0x3b/0xa0 [ 122.942957] [<ffffffff812db5cd>] pci_stop_and_remove_bus_device+0xd/0x20 [ 122.944004] [<ffffffff812f3992>] trim_stale_devices+0x62/0xc0 [ 122.945034] [<ffffffff812f39db>] trim_stale_devices+0xab/0xc0 [ 122.946042] [<ffffffff812f39db>] trim_stale_devices+0xab/0xc0 [ 122.947034] [<ffffffff812f3dbe>] acpiphp_check_bridge+0x7e/0xd0 [ 122.948036] [<ffffffff812f4bf2>] hotplug_event+0xf2/0x230 [ 122.949042] [<ffffffff8130dcf3>] ? acpi_os_release_object+0x9/0xd [ 122.950054] [<ffffffff812f4d52>] hotplug_event_work+0x22/0x60 [ 122.951067] [<ffffffff8105da2a>] process_one_work+0x17a/0x430 [ 122.952084] [<ffffffff8105e619>] worker_thread+0x119/0x390 [ 122.953095] [<ffffffff8105e500>] ? manage_workers.isra.25+0x2a0/0x2a0 [ 122.954107] [<ffffffff810647bb>] kthread+0xbb/0xc0 [ 122.955115] [<ffffffff81064700>] ? kthread_create_on_node+0x110/0x110 [ 122.956136] [<ffffffff817db3fc>] ret_from_fork+0x7c/0xb0 [ 122.957141] [<ffffffff81064700>] ? kthread_create_on_node+0x110/0x110 [ 122.958145] ---[ end trace a0dcbb3b178e4755 ]--- -- 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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