Re: Bug: 2.6.24-smp: Eeek! page_mapcount(page) went negative! (-1)

On Wed, 6 Feb 2008, kerndev@xxxxxxxxxxxxxxx wrote:

Before digging into this myself (don't really have enought time),
I thought I'd submit it here...

Thanks for the report.

Feb 6 09:09:47 sc-software kernel: Eeek! page_mapcount(page) went negative!

These very often turn out the be due to bad RAM or some such:
worth running memtest86+ overnight when you can, though its
success wouldn't be conclusive.

(-1)
Feb 6 09:09:47 sc-software kernel: page pfn = 12b1b1
Feb 6 09:09:47 sc-software kernel: page->flags = 80080014
Feb 6 09:09:47 sc-software kernel: page->count = 0

That's a free page which shouldn't have appeared in the pagetable.
It could be that there's a bit error somewhere in that pfn of 12b1b1.

Feb 6 09:09:47 sc-software kernel: page->mapping = 00000000
Feb 6 09:09:47 sc-software kernel: vma->vm_ops = 0x0
Feb 6 09:09:47 sc-software kernel: ------------[ cut here ]------------
Feb 6 09:09:47 sc-software kernel: kernel BUG at mm/rmap.c:631!
Feb 6 09:09:47 sc-software kernel: invalid opcode: 0000 [#2] PREEMPT SMP
Feb 6 09:09:47 sc-software kernel: Modules linked in: shpchp pci_hotplug
ohci1394 ieee1394
Feb 6 09:09:47 sc-software kernel:
Feb 6 09:09:47 sc-software kernel: Pid: 3710, comm: X Tainted: G D

But that [#2] and that D taint both say there was already a problem
before this: anything showing in the log for that?

Hugh
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