Date:	Tue, 22 Oct 2013 21:32:16 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Andreas Noever <andreas.noever@...il.com>
Cc:	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>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list_scan

[+cc Yinghai]

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:
>>> > [+cc Rafael, Mika, Kirill, linux-pci]
>>> >
>>> > 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:
>>> >
>>> > There have been significant changes in acpiphp related to Thunderbolt
>>> > since v3.11.
>>>
>>> Apple don't expose Thunderbolt via ACPI, so it appears as native PCIe.
>>> I'd be surprised if acpiphp makes a difference here.
>>
>> Yeah, you're right; I wasn't paying attention.
>>
>> 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
> Modules linked in:
>  btusb bluetooth joydev hid_apple bcm5974 nls_utf8 nls_cp437 hfsplus
> vfat fat snd_hda_codec_hdmi x86_pkg_temp_thermal intel_powerclamp
> coretemp kvm_intel kvm cfg80211 uvcvideo crc32_pclmul crc32c_intel
> videobuf2_vmalloc ghash_clmulni_intel aesni_intel videobuf2_memops
> aes_x86_64 glue_helper videobuf2_core tg3 videodev lrw gf128mul
> ablk_helper iTCO_wdt hid_generic iTCO_vendor_support cryptd media
> applesmc input_polldev usbhid ptp microcode snd_hda_codec_cirrus hid
> pps_core libphy rfkill i2c_i801 pcspkr snd_hda_intel apple_gmux
> lib80211 snd_hda_codec acpi_cpufreq snd_hwdep snd_pcm snd_page_alloc
> snd_timer mei_me snd mei processor soundcore lpc_ich evdev mfd_core
> apple_bl ac battery ext4 crc16 mbcache jbd2 sd_mod ahci libahci libata
> xhci_hcd ehci_pci sdhci_pci ehci_hcd sdhci scsi_mod mmc_core
>  usbcore usb_common nouveau mxm_wmi wmi ttm i915 video button
> i2c_algo_bit intel_agp intel_gtt drm_kms_helper drm i2c_core
> CPU: 0 PID: 122 Comm: kworker/u16:5 Not tainted 3.12.0-1-dirty #30
> Hardware name: Apple Inc. MacBookPro10,1/Mac-C3EC7CD22292981F, BIOS
> MBP101.88Z.00EE.B03.1212211437 12/21/2012
> Workqueue: sysfsd sysfs_schedule_callback_work
>  0000000000000009 ffff88044c021c00 ffffffff814c4288 ffff88044c021c48
>  ffff88044c021c38 ffffffff81061b7d ffff880458a5c000 ffffffff8187c5c0
>  ffff880458a5c000 ffff880458a5b098 0000000000000000 ffff88044c021c98
> Call Trace:
>  [<ffffffff814c4288>] dump_stack+0x54/0x8d
>  [<ffffffff81061b7d>] warn_slowpath_common+0x7d/0xa0
>  [<ffffffff81061bec>] warn_slowpath_fmt+0x4c/0x50
>  [<ffffffff812bdd92>] ? do_pci_disable_device+0x52/0x60
>  [<ffffffff813097f3>] ? acpi_pci_irq_disable+0x4c/0x8d
>  [<ffffffff812bde24>] pci_disable_device+0x84/0x90
>  [<ffffffff812cc62a>] pcie_portdrv_remove+0x1a/0x20
>  [<ffffffff812bfcdb>] pci_device_remove+0x3b/0xb0
>  [<ffffffff81381caf>] __device_release_driver+0x7f/0xf0
>  [<ffffffff81381d43>] device_release_driver+0x23/0x30
>  [<ffffffff813814d8>] bus_remove_device+0x108/0x180
>  [<ffffffff8137de75>] device_del+0x135/0x1d0
>  [<ffffffff812ba394>] pci_stop_bus_device+0x94/0xa0
>  [<ffffffff812ba33b>] pci_stop_bus_device+0x3b/0xa0
>  [<ffffffff812ba4a2>] pci_stop_and_remove_bus_device+0x12/0x20
>  [<ffffffff812c15c5>] remove_callback+0x25/0x40
>  [<ffffffff81212ad4>] sysfs_schedule_callback_work+0x14/0x80
>  [<ffffffff8107c9e8>] process_one_work+0x178/0x470
>  [<ffffffff8107d3b1>] worker_thread+0x121/0x3a0
>  [<ffffffff8107d290>] ? manage_workers.isra.21+0x2b0/0x2b0
>  [<ffffffff810840f0>] kthread+0xc0/0xd0
>  [<ffffffff81084030>] ? kthread_create_on_node+0x120/0x120
>  [<ffffffff814d2dfc>] ret_from_fork+0x7c/0xb0
>  [<ffffffff81084030>] ? kthread_create_on_node+0x120/0x120
> ---[ end trace b39a15fa94fbb2a2 ]---
>
>
> Bisection points to 928bea964827d7824b548c1f8e06eccbbc4d0d7d .

This is "PCI: Delay enabling bridges until they're needed" by Yinghai.

Yinghai, please comment.

> From this commit on the pci_pme_list_scan crash disappears and the
> warning appears.
>
> Since this commit seems to just mask the problem I went ahead and
> tested your patch on 3.12-rc5 as well. It seems to work (not crash)
> but the warning is still there.
>
> The above warning was triggered by removing the 08 bridge via sysfs.
> The same warning can be triggered by unplugging the adapter (dmesg
> below). The ethernet card is removed immediately. The bridges follow
> 15 seconds later together with the warning. The topology is:
> 06:03.0 -- 08 -- 09 -- 0a (tg3)
> (full lspci -vv is attached)
>
> [   25.077577] pciehp 0000:06:03.0:pcie24: Card not present on Slot(3-1)
> [   25.077626] tg3 0000:0a:00.0: PME# disabled
> [   26.284664] tg3 0000:0a:00.0: tg3_abort_hw timed out,
> TX_MODE_ENABLE will not clear MAC_TX_MODE=ffffffff
> [   27.669942] tg3 0000:0a:00.0 ens9: No firmware running
> [   38.661674] tg3 0000:0a:00.0 ens9: Link is down
> [   40.094609] pcieport 0000:09:00.0: PME# disabled
> [   40.094771] pciehp 0000:09:00.0:pcie24: unloading service driver pciehp
> [   40.094781] pci_bus 0000:0a: dev 00, dec refcount to 0
> [   40.094795] pci_bus 0000:0a: dev 00, released physical slot 9
> [   40.094981] ------------[ cut here ]------------
> [   40.094992] WARNING: CPU: 0 PID: 53 at drivers/pci/pci.c:1430
> pci_disable_device+0x84/0x90()
> [   40.094995] Device pcieport
> disabling already-disabled device
> [   40.094997] Modules linked in:
> [   40.094999]  btusb bluetooth joydev hid_apple bcm5974
> lib80211_crypt_tkip nls_cp437 vfat fat snd_hda_codec_hdmi nls_utf8
> x86_pkg_temp_thermal intel_powerclamp hfsplus coretemp wl(O) kvm_intel
> kvm crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel
> aes_x86_64 glue_helper lrw gf128mul iTCO_wdt ablk_helper tg3 cryptd
> cfg80211 hid_generic applesmc iTCO_vendor_support input_polldev usbhid
> ptp hid snd_hda_codec_cirrus microcode pps_core libphy i2c_i801 pcspkr
> snd_hda_intel rfkill snd_hda_codec lib80211 uvcvideo snd_hwdep
> videobuf2_vmalloc videobuf2_memops snd_pcm videobuf2_core videodev
> acpi_cpufreq mei_me apple_gmux snd_page_alloc mei snd_timer lpc_ich
> mfd_core snd media battery apple_bl soundcore evdev processor ac ext4
> crc16 mbcache jbd2 sd_mod ahci libahci libata xhci_hcd ehci_pci
> sdhci_pci ehci_hcd
> [   40.095212]  sdhci scsi_mod mmc_core usbcore usb_common nouveau
> mxm_wmi wmi ttm i915 video button i2c_algo_bit intel_agp intel_gtt
> drm_kms_helper drm i2c_core
> [   40.095242] CPU: 0 PID: 53 Comm: kworker/0:1 Tainted: G        W  O
> 3.12.0-1-dirty #31
> [   40.095246] Hardware name: Apple Inc.
> MacBookPro10,1/Mac-C3EC7CD22292981F, BIOS
> MBP101.88Z.00EE.B03.1212211437 12/21/2012
> [   40.095253] Workqueue: pciehp-3 pciehp_power_thread
> [   40.095256]  0000000000000009 ffff880458ab5b98 ffffffff814c42b8
> ffff880458ab5be0
> [   40.095262]  ffff880458ab5bd0 ffffffff81061b7d ffff880458a5c000
> ffffffff8187c5c0
> [   40.095268]  ffff880458a5c000 ffff880458a5b098 0000000000000000
> ffff880458ab5c30
> [   40.095287] Call Trace:
> [   40.095293]  [<ffffffff814c42b8>] dump_stack+0x54/0x8d
> [   40.095298]  [<ffffffff81061b7d>] warn_slowpath_common+0x7d/0xa0
> [   40.095302]  [<ffffffff81061bec>] warn_slowpath_fmt+0x4c/0x50
> [   40.095306]  [<ffffffff812bddb2>] ? do_pci_disable_device+0x52/0x60
> [   40.095310]  [<ffffffff81309823>] ? acpi_pci_irq_disable+0x4c/0x8d
> [   40.095313]  [<ffffffff812bde44>] pci_disable_device+0x84/0x90
> [   40.095317]  [<ffffffff812cc65a>] pcie_portdrv_remove+0x1a/0x20
> [   40.095321]  [<ffffffff812bfd0b>] pci_device_remove+0x3b/0xb0
> [   40.095325]  [<ffffffff81381cdf>] __device_release_driver+0x7f/0xf0
> [   40.095328]  [<ffffffff81381d73>] device_release_driver+0x23/0x30
> [   40.095331]  [<ffffffff81381508>] bus_remove_device+0x108/0x180
> [   40.095336]  [<ffffffff8137dea5>] device_del+0x135/0x1d0
> [   40.095350]  [<ffffffff812ba394>] pci_stop_bus_device+0x94/0xa0
> [   40.095353]  [<ffffffff812ba33b>] pci_stop_bus_device+0x3b/0xa0
> [   40.095357]  [<ffffffff812ba4a2>] pci_stop_and_remove_bus_device+0x12/0x20
> [   40.095361]  [<ffffffff812d2e48>] pciehp_unconfigure_device+0xa8/0x1b0
> [   40.095364]  [<ffffffff812d27a8>] pciehp_disable_slot+0x68/0x200
> [   40.095368]  [<ffffffff812d29c3>] pciehp_power_thread+0x83/0xf0
> [   40.095372]  [<ffffffff8107c9e8>] process_one_work+0x178/0x470
> [   40.095375]  [<ffffffff8107d3b1>] worker_thread+0x121/0x3a0
> [   40.095379]  [<ffffffff8107d290>] ? manage_workers.isra.21+0x2b0/0x2b0
> [   40.095382]  [<ffffffff810840f0>] kthread+0xc0/0xd0
> [   40.095385]  [<ffffffff81084030>] ? kthread_create_on_node+0x120/0x120
> [   40.095389]  [<ffffffff814d2e3c>] ret_from_fork+0x7c/0xb0
> [   40.095392]  [<ffffffff81084030>] ? kthread_create_on_node+0x120/0x120
> [   40.095404] ---[ end trace 12862498ad48cb36 ]---
> [   40.095513] pcieport 0000:08:00.0: PME# disabled
> [   40.096296] pci_bus 0000:0a: busn_res: [bus 0a] is released
> [   40.096367] pci_bus 0000:09: busn_res: [bus 09-0a] is released
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