Messages in this thread |  | | | Date | Fri, 9 Mar 2012 13:00:15 -0500 | | From | Dave Jones <> | | Subject | Re: inode->i_wb_list corruption. |
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(trimmed cc)
On Sat, Mar 10, 2012 at 12:14:37AM +0800, Yang Bai wrote: > On Fri, Mar 9, 2012 at 11:19 PM, Dave Jones <davej@redhat.com> wrote: > > And with that, this arrived.. > > https://bugzilla.redhat.com/show_bug.cgi?id=788433#c3 > > > > I'm leaning strongly towards believing this is yet another case of i915 > > corrupting memory on resume. > > Nice catch. I am wondering > 1) why all lists being affected and > 2) why all list_head's prev being set to NULL. > > Any ideas?
This is probably the same bug: https://bugzilla.kernel.org/show_bug.cgi?id=37142 Petr noticed that the corruption is 32 bytes getting zeroed at the beginning of a page.
I think this may be responsible for a lot of different bugs that we've had reported.
i915_drm_thaw is a deep nest of functions though, so this is going to be hard to track down where that write is coming from. Because the corruption seems to happen to pages that are already allocated, we probably can't even rely on DEBUG_PAGEALLOC, though it might be worth trying.
Dave
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