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Date: Sun, 27 Oct 2013 02:39:30 +0200 From: Andreas Noever <andreas.noever@...il.com> To: Bjorn Helgaas <bhelgaas@...gle.com> Cc: Yinghai Lu <yinghai@...nel.org>, 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> Subject: Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list_scan > Sorry, I didn't understand this. Is this supposed to be an > explanation of how 928bea fixes the oops that Andreas saw? If so, can > you be a little more explicit about when the pci_dev got freed and > when pci_pme_list_scan() walked the list and accessed the freed area? I did some more debugging and it seems that 928bea is innocent after all. I added some debugging statements to pci_pme_active. The additional delay seems to make the oops easier to trigger and I can now replicate it up to https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5137a2ee2007d9cbbbeebd14abe08357a079b607 which makes much more sense. Here is what's going on (in 3.11). First of all pci_pme_activate is only ever called with false as the second paramter during boot. Now when I unplug the adapter, the first call is: [<ffffffff814b1cc7>] dump_stack+0x54/0x8d [<ffffffff812ae970>] pci_pme_active+0x30/0x210 [<ffffffff813bf2bc>] ? pci_read+0x2c/0x30 (this should be pci_stop_dev imho) [<ffffffff812ac8ae>] pci_stop_bus_device+0x4e/0xa0 [<ffffffff812ac89b>] pci_stop_bus_device+0x3b/0xa0 [<ffffffff812ac89b>] pci_stop_bus_device+0x3b/0xa0 [<ffffffff812aca02>] pci_stop_and_remove_bus_device+0x12/0x20 [<ffffffff812c4698>] pciehp_unconfigure_device+0xa8/0x1b0 [<ffffffff812c3ff8>] pciehp_disable_slot+0x68/0x200 [<ffffffff812c4213>] pciehp_power_thread+0x83/0xf0 [<ffffffff8107b5b8>] process_one_work+0x178/0x470 [<ffffffff8107bf81>] worker_thread+0x121/0x3a0 [<ffffffff8107be60>] ? manage_workers.isra.21+0x2b0/0x2b0 [<ffffffff81082d80>] kthread+0xc0/0xd0 [<ffffffff81060000>] ? SyS_unshare+0x220/0x280 [<ffffffff81082cc0>] ? kthread_create_on_node+0x120/0x120 [<ffffffff814c07ec>] ret_from_fork+0x7c/0xb0 [<ffffffff81082cc0>] ? kthread_create_on_node+0x120/0x120 tg3 0000:0a:00.0: PME# disabled This is still fine. But then it gets interesting. The next call is: [<ffffffff814b1cc7>] dump_stack+0x54/0x8d [<ffffffff812ae970>] pci_pme_active+0x30/0x210 [<ffffffff812aebb5>] __pci_enable_wake+0x65/0x160 [<ffffffff812aecd5>] pci_wake_from_d3+0x25/0x40 [<ffffffffa0511c29>] tg3_power_down+0x29/0x40 [tg3] [<ffffffffa0511d4c>] tg3_close+0x10c/0x1d0 [tg3] [<ffffffff813d67b5>] __dev_close_many+0x85/0xd0 [<ffffffff813d68cb>] dev_close_many+0x8b/0x100 [<ffffffff813d8dd8>] rollback_registered_many+0xd8/0x250 [<ffffffff813d8f7d>] rollback_registered+0x2d/0x40 [<ffffffff813da828>] unregister_netdevice_queue+0x58/0xb0 [<ffffffff813da89c>] unregister_netdev+0x1c/0x30 [<ffffffffa050104b>] tg3_remove_one+0x6b/0x120 [tg3] [<ffffffff812b1b0b>] pci_device_remove+0x3b/0xb0 [<ffffffff81371c1f>] __device_release_driver+0x7f/0xf0 [<ffffffff81371cb3>] device_release_driver+0x23/0x30 [<ffffffff81371484>] bus_remove_device+0xf4/0x170 [<ffffffff8136df45>] device_del+0x135/0x1d0 [<ffffffff812ac8f4>] pci_stop_bus_device+0x94/0xa0 [<ffffffff812ac89b>] pci_stop_bus_device+0x3b/0xa0 [<ffffffff812ac89b>] pci_stop_bus_device+0x3b/0xa0 [<ffffffff812aca02>] pci_stop_and_remove_bus_device+0x12/0x20 [<ffffffff812c4698>] pciehp_unconfigure_device+0xa8/0x1b0 [<ffffffff812c3ff8>] pciehp_disable_slot+0x68/0x200 [<ffffffff812c4213>] pciehp_power_thread+0x83/0xf0 [<ffffffff8107b5b8>] process_one_work+0x178/0x470 [<ffffffff8107bf81>] worker_thread+0x121/0x3a0 [<ffffffff8107be60>] ? manage_workers.isra.21+0x2b0/0x2b0 [<ffffffff81082d80>] kthread+0xc0/0xd0 [<ffffffff81060000>] ? SyS_unshare+0x220/0x280 [<ffffffff81082cc0>] ? kthread_create_on_node+0x120/0x120 [<ffffffff814c07ec>] ret_from_fork+0x7c/0xb0 [<ffffffff81082cc0>] ? kthread_create_on_node+0x120/0x120 tg3 0000:0a:00.0: PME# enabled On removal tg3 calls pci_wake_from_d3 to enable/disable wake-on-lan. This then calls pci_pme_activate(dev, true) for a device which is about to be deleted. The linked commit does no longer call pci_wake_from_d3, which "fixes" the problem. Andreas -- 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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