Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list_scan

[Bjorn Helgaas]

[+cc Rafael, Mika, Kirill, linux-pci]

On Mon, Oct 14, 2013 at 4:47 PM, Andreas Noever
<andreas.noever@xxxxxxxxx> 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.  Any chance you can try reproduce this problem on a
current kernel, e.g., v3.12-rc5?  If it still happens, can you collect
a complete dmesg log, acpidump, and "lspci -vv" output, and attach
them to a new http://bugzilla.kernel.org report?

Since you're doing a remove two levels above the Thunderbolt device,
and it looks like pciehp is handling this part, you might be seeing
something new, but the info above will still be a good start in
looking at it.

Bjorn

> pciehp 0000:09:00.0:pcie24: unloading service driver pciehp
> pci_bus 0000:0a: busn_res: [bus 0a] is released
> pci_bus 0000:09: busn_res: [bus 09-0a] is released
> general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> ....
> Workqueue: events pci_pme_list_scan
> task: ffff88044b0b8000 ti: ffff88044ac62000 task.ti: ffff88044ac62000
> RIP: 0010:[<ffffffff812bdc8c>]  [<ffffffff812bdc8c>] pci_pme_list_scan+0x3c/0xe0
> RSP: 0018:ffff88044ac63e10  EFLAGS: 00010202
> RAX: ffff88045601e7b0 RBX: ffffffff8187b070 RCX: 0000000000000000
> RDX: 6b6b6b6b6b6b6b6b RSI: ffff88044ac63da0 RDI: ffff880453250ca8
> RBP: ffff88044ac63e20 R08: ffff88044ac63da0 R09: 0001f9e0c287afc0
> R10: 0001f9e0c287afc0 R11: 0000000000000000 R12: ffff880453250ca8
> R13: ffff88046d053d00 R14: ffff88046d058200 R15: ffffffff8187afc8
> FS:  0000000000000000(0000) GS:ffff88046d040000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fd301d57000 CR3: 000000000280d000 CR4: 00000000001407e0
> Stack:
>  ffffffff8187afc0 ffff88044a920e40 ffff88044ac63e68 ffffffff8107ddd6
>  000000006d053d00 0000000000000000 ffff88046d053d00 ffff88046d053d18
>  ffff88044a920e70 ffff88044b0b8000 ffff88044a920e40 ffff88044ac63ec8
> Call Trace:
>  [<ffffffff8107ddd6>] process_one_work+0x176/0x470
>  [<ffffffff8107e79b>] worker_thread+0x11b/0x3a0
>  [<ffffffff8107e680>] ? manage_workers.isra.21+0x2b0/0x2b0
>  [<ffffffff810855e0>] kthread+0xc0/0xd0
>  [<ffffffff81085520>] ? kthread_create_on_node+0x110/0x110
>  [<ffffffff814f4c2c>] ret_from_fork+0x7c/0xb0
>  [<ffffffff81085520>] ? kthread_create_on_node+0x110/0x110
> Code: 54 53 e8 f8 c6 22 00 4c 8b 25 01 d4 5b 00 49 81 fc 70 b0 87 81
> 0f 84 98 00 00 00 49 8b 1c 24 4c 89 e7 eb 36 0f 1f 00 48 8b 50 10 <48>
> 8b 52 38 48 85 d2 74 07 8b 4a 78 85 c9 75 0a 31 f6 48 89 c7
> RIP  [<ffffffff812bdc8c>] pci_pme_list_scan+0x3c/0xe0
>  RSP <ffff88044ac63e10>
> ---[ end trace 3905f90a7dacf7b3 ]---
>
> The offending line is:
> (gdb) list *(pci_pme_list_scan+0x3c)
> 0xffffffff812bdc8c is in pci_pme_list_scan (drivers/pci/pci.c:1551).
> 1546            if (!list_empty(&pci_pme_list)) {
> 1547                    list_for_each_entry_safe(pme_dev, n,
> &pci_pme_list, list) {
> 1548                            if (pme_dev->dev->pme_poll) {
> 1549                                    struct pci_dev *bridge;
> 1550
> 1551                                    bridge = pme_dev->dev->bus->self;
> 1552                                    /*
> 1553                                     * If bridge is in low power state, the
> 1554                                     * configuration space of
> subordinate devices
> 1555                                     * may be not accessible
> If I read the disassembly correctly then the deref of bus seems to
> cause the oops.
>
> An almost identical bug was reported (and fixed) some time ago:
> http://lkml.indiana.edu/hypermail/linux/kernel/1302.1/01165.html
>
> Andreas
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