From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org Subject: [Bug 78530] New: Memory corruption on Lenovo t440p with runpm Date: Sat, 10 May 2014 15:22:28 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0034394715==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: nouveau-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Nouveau" To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org List-Id: nouveau.vger.kernel.org --===============0034394715== Content-Type: multipart/alternative; boundary="1399735348.5df0d8051.17865"; charset="us-ascii" --1399735348.5df0d8051.17865 Date: Sat, 10 May 2014 15:22:28 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=78530 Priority: medium Bug ID: 78530 Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Summary: Memory corruption on Lenovo t440p with runpm QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org Severity: normal Classification: Unclassified OS: All Reporter: nikoamia-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Hardware: Other Status: NEW Version: unspecified Component: Driver/nouveau Product: xorg On recent kernels with runpm the system crashes (with a big memory corruption) when nvidia card is disabled and then enabled on Lenovo T440p laptops with recent BIOSes (1.16+). My investigations into this: 1. The crash occurs even with just acpi_call, so it looks like on those BIOSes there is some new kind of procedure for enabling nvidia. 2. ACPI calls from Windows and Linux does not differ much (and trying Windows' calling sequence does not help). Also, DSDT from 1.14 and 1.16 BIOSes basically do not differ. 3. The bug can be workarounded by disabling all memory upper than 4GB 4. This bug affects not really memory (there is no corruption of regular memory), but devices using memory regions. For example, I can load system from ramdisk with all such devices disabled, (1) perform acpi nvidia disable-enable and (2) try to load such module (order of (1) and (2) does not matter) -- errors pile up, even if I unload and load this module. My own hypothesis is that something with PCI bus gets broken -- maybe some reinitialization needs to be performed? Links: 1. https://github.com/Bumblebee-Project/bbswitch/issues/78 (main discussion place) 2. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268669 (ubuntu bug report) 3. https://bbs.archlinux.org/viewtopic.php?pid=1414109 (one of forum threads about this) -- You are receiving this mail because: You are the assignee for the bug. --1399735348.5df0d8051.17865 Date: Sat, 10 May 2014 15:22:28 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"
Priority medium
Bug ID 78530
Assignee nouveau@lists.freedesktop.org
Summary Memory corruption on Lenovo t440p with runpm
QA Contact xorg-team@lists.x.org
Severity normal
Classification Unclassified
OS All
Reporter nikoamia@gmail.com
Hardware Other
Status NEW
Version unspecified
Component Driver/nouveau
Product xorg 

On recent kernels with runpm the system crashes (with a big memory corruption)
when nvidia card is disabled and then enabled on Lenovo T440p laptops with
recent BIOSes (1.16+).

My investigations into this:
1. The crash occurs even with just acpi_call, so it looks like on those BIOSes
there is some new kind of procedure for enabling nvidia.
2. ACPI calls from Windows and Linux does not differ much (and trying Windows'
calling sequence does not help). Also, DSDT from 1.14 and 1.16 BIOSes basically
do not differ.
3. The bug can be workarounded by disabling all memory upper than 4GB
4. This bug affects not really memory (there is no corruption of regular
memory), but devices using memory regions. For example, I can load system from
ramdisk with all such devices disabled, (1) perform acpi nvidia disable-enable
and (2) try to load such module (order of (1) and (2) does not matter) --
errors pile up, even if I unload and load this module.

My own hypothesis is that something with PCI bus gets broken -- maybe some
reinitialization needs to be performed?

Links:
1. https://github.com/Bumblebee-Project/bbswitch/issues/78 (main discussion
place)
2. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268669 (ubuntu bug
report)
3. https://bbs.archlinux.org/viewtopic.php?pid=1414109 (one of forum threads
about this)

You are receiving this mail because:
  • You are the assignee for the bug.
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