Re: warn_slowpath_common in drivers/pci/search.c:44 on linux-3.4.0

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On Sat, May 26, 2012 at 2:25 AM, Antonio Quartulli <ordex@xxxxxxxxxxxxx> wrote:
> Hello,
>
> I'm getting this warning with linux-3.4.0. My laptop is a DELL E5420.
> Please tell me if you need further testing/debug.

Hi Antonio,

Thanks for the report.  Is this a regression?  If so, what's the most
recent kernel that works correctly?  Can you collect a complete dmesg
log and the output of "lspci -vv"?

> [    1.054279] WARNING: at drivers/pci/search.c:44 pci_find_upstream_pcie_bridge+0x5e/0x70()
> [    1.054385] Hardware name: Latitude E5420
> [    1.054457] Modules linked in:
> [    1.054568] Pid: 1, comm: swapper/0 Not tainted 3.4.0ordex+ #3
> [    1.054643] Call Trace:
> [    1.054716]  [<ffffffff81033d4a>] warn_slowpath_common+0x7a/0xb0
> [    1.054793]  [<ffffffff81033d95>] warn_slowpath_null+0x15/0x20
> [    1.054869]  [<ffffffff8123899e>] pci_find_upstream_pcie_bridge+0x5e/0x70
> [    1.054949]  [<ffffffff813babe7>] intel_iommu_device_group+0x77/0x100
> [    1.055027]  [<ffffffff813b52d5>] add_iommu_group+0x35/0x60
> [    1.055113]  [<ffffffff813b52a0>] ? bus_set_iommu+0x50/0x50
> [    1.055191]  [<ffffffff8132c586>] bus_for_each_dev+0x56/0x90
> [    1.055267]  [<ffffffff813b528b>] bus_set_iommu+0x3b/0x50
> [    1.055344]  [<ffffffff818c4920>] intel_iommu_init+0xab0/0xb3f
> [    1.055421]  [<ffffffff81120b26>] ? sys_mkdirat+0x76/0xd0
> [    1.055499]  [<ffffffff8189b0db>] ? memblock_find_dma_reserve+0x13d/0x13d
> [    1.055578]  [<ffffffff8189b0ee>] pci_iommu_init+0x13/0x3e
> [    1.055655]  [<ffffffff810001ca>] do_one_initcall+0x3a/0x170
> [    1.055732]  [<ffffffff81897c35>] kernel_init+0x148/0x1cc
> [    1.055807]  [<ffffffff81897588>] ? do_early_param+0x86/0x86
> [    1.055884]  [<ffffffff814fc914>] kernel_thread_helper+0x4/0x10
> [    1.055963]  [<ffffffff8105de60>] ? finish_task_switch+0x80/0x110
> [    1.056040]  [<ffffffff814fafdd>] ? retint_restore_args+0xe/0xe
> [    1.056126]  [<ffffffff81897aed>] ? start_kernel+0x30b/0x30b
> [    1.056203]  [<ffffffff814fc910>] ? gs_change+0xb/0xb
>
>
>
> --
> Antonio Quartulli
>
> ..each of us alone is worth nothing..
> Ernesto "Che" Guevara
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