https://bugzilla.kernel.org/show_bug.cgi?id=80911
Bug ID: 80911
Summary: 3.16-rcX crashes on resume from Suspend-To-RAM
Product: ACPI
Version: 2.5
Kernel Version: 3.16-rc1
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Sleep-Wake
Assignee: [email protected]
Reporter: [email protected]
Regression: No
From: [email protected]
> My Dell M4400 has been pretty well-supported by Linux a couple of
> years now, but recent 3.16-rcX cause hard crashes when resuming from
> Suspend-to-RAM.
>
> This is tricky to debug, as device drivers are not yet restored by the
> time that the crash happens. So, I can't use Page-UP to scroll the
> screen and see the full crash information. I also cannot use the
> netconsole; the ethernet device is still suspended. For similar
> reasons, crash kernels don't seem to work either.
>
> After about a day of false starts and a lengthy bi-secting session, I
> finally narrowed things down to this change list:
>
> eec15edbb0e14485998635ea7c62e30911b465f0 is the first bad commit
> commit eec15edbb0e14485998635ea7c62e30911b465f0
> Author: Zhang Rui <[email protected]>
> Date: Fri May 30 04:23:01 2014 +0200
>
> ACPI / PNP: use device ID list for PNPACPI device enumeration
>
> ACPI can be used to enumerate PNP devices, but the code does not
> handle this in the right way currently. Namely, if an ACPI device
> object
> 1. Has a _CRS method,
> 2. Has an identification of
> "three capital characters followed by four hex digits",
> 3. Is not in the excluded IDs list,
> it will be enumerated to PNP bus (that is, a PNP device object will
> be create for it). This means that, actually, the PNP bus type is
> used as the default bus type for enumerating _HID devices in ACPI.
>
> However, more and more _HID devices need to be enumerated to the
> platform bus instead (that is, platform device objects need to be
> created for them). As a result, the device ID list in acpi_platform.c
> is used to enforce creating platform device objects rather than PNP
> device objects for matching devices. That list has been continuously
> growing recently, unfortunately, and it is pretty much guaranteed to
> grow even more in the future.
>
> To address that problem it is better to enumerate _HID devices
> as platform devices by default. To this end, change the way of
> enumerating PNP devices by adding a PNP ACPI scan handler that
> will use a device ID list to create PNP devices for the ACPI
> device objects whose device IDs are present in that list.
>
> The initial device ID list in the PNP ACPI scan handler contains
> all of the pnp_device_id strings from all the existing PNP drivers,
> so this change should be transparent to the PNP core and all of the
> PNP drivers. Still, in the future it should be possible to reduce
> its size by converting PNP drivers that need not be PNP for any
> technical reasons into platform drivers.
>
> Signed-off-by: Zhang Rui <[email protected]>
> [rjw: Rewrote the changelog, modified the PNP ACPI scan handler code]
> Signed-off-by: Rafael J. Wysocki <[email protected]>
> Reviewed-by: Mika Westerberg <[email protected]>
>
> :040000 040000
> b7c07232aa46ae7b6faf9a907fb7274a02e4680fc2e05b31a61dccd087c554adecc89a
> 43a1ed81f7
> M drivers
> :040000 040000
> 4eda970292fffbeebe167f9210502527df4e8ab421e9e6fd84c780a34bf3d48b5e7618
> b551da3b1a
> M include
>
> I took a photo of the crash. It feels silly to do, but I couldn't
> think of a better solution. You can find it at
> https://drive.google.com/file/d/0B8SxqKDe4hyheTlTLXY2YThkMXM
>
> As I mentioned earlier, a bunch of information has already scrolled
> off the screen, but hopefully what is visible is somewhat helpful.
>
> I will have only limited internet access the next couple of weeks. But
> I wanted to make sure I at least got the result of the bisection out
> to LKML. I will make every best effort to collect additional data, if
> asked to do so; but some of it might be delayed for a little bit,
> until I can get access to reasonably powerful hardware or reasonably
> fast internet.
>
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