* Re: [Bugme-new] [Bug 37072] New: Random BUG at include/linux/swapops.h:105
[not found] <bug-37072-10286@https.bugzilla.kernel.org/>
@ 2011-06-20 20:53 ` Andrew Morton
2011-06-20 21:10 ` Christoph Lameter
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Morton @ 2011-06-20 20:53 UTC (permalink / raw)
To: Christoph Lameter; +Cc: bugme-daemon, linux-mm, luke-jr+linuxbugs
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Fri, 10 Jun 2011 01:09:48 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=37072
>
> Summary: Random BUG at include/linux/swapops.h:105
> Product: Memory Management
> Version: 2.5
> Kernel Version: 2.6.39
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: high
> Priority: P1
> Component: Other
> AssignedTo: akpm@linux-foundation.org
> ReportedBy: luke-jr+linuxbugs@utopios.org
> Regression: Yes
>
>
> Didn't have a sensible console working apparently... photo of monitor:
> http://www.facebook.com/photo.php?pid=2522123&l=ec1a1e6145&id=1496065002
>
handle_mm_fault
->handle_pte_fault
->do_swap_page
->migration_entry_wait
->migration_entry_to_page
->BUG_ON(!PageLocked(p))
How is this supposed to ever work?
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [Bugme-new] [Bug 37072] New: Random BUG at include/linux/swapops.h:105
2011-06-20 20:53 ` [Bugme-new] [Bug 37072] New: Random BUG at include/linux/swapops.h:105 Andrew Morton
@ 2011-06-20 21:10 ` Christoph Lameter
0 siblings, 0 replies; 2+ messages in thread
From: Christoph Lameter @ 2011-06-20 21:10 UTC (permalink / raw)
To: Andrew Morton; +Cc: bugme-daemon, linux-mm, luke-jr+linuxbugs
On Mon, 20 Jun 2011, Andrew Morton wrote:
> handle_mm_fault
> ->handle_pte_fault
> ->do_swap_page
> ->migration_entry_wait
> ->migration_entry_to_page
> ->BUG_ON(!PageLocked(p))
>
> How is this supposed to ever work?
A page is always locked during migration. Thus a migration entry can
only exist while a page is locked. The migration entries purpose is
to hold off establishing new references to a page that is locked.
See unmap_and_move().
Looks like some of the recent patches may cause an unlock the page without
removal of the migration entry?
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^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-37072-10286@https.bugzilla.kernel.org/>
2011-06-20 20:53 ` [Bugme-new] [Bug 37072] New: Random BUG at include/linux/swapops.h:105 Andrew Morton
2011-06-20 21:10 ` Christoph Lameter
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