Re: [Bug 43227] New: BUG: Bad page state in process wcg_gfam_6.11_i

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On Fri, May 11, 2012 at 12:59:21PM -0700, Andrew Morton wrote:
 
 > > https://bugzilla.kernel.org/show_bug.cgi?id=43227
 > > 
 > > [67031.755786] BUG: Bad page state in process wcg_gfam_6.11_i  pfn:02519
 > > [67031.755790] page:ffffea0000094640 count:0 mapcount:0 mapping:         
 > > (null) index:0x7f1eb293b
 > > [67031.755792] page flags: 0x4000000000000014(referenced|dirty)
 > 
 > AFAICT we got this warning because the page allocator found a free page
 > with PG_referenced and PG_dirty set.
 > 
 > It would be a heck of a lot more useful if we'd been told about this
 > when the page was freed, not when it was reused!  Can anyone think of a
 > reason why PAGE_FLAGS_CHECK_AT_FREE doesn't include these flags (at
 > least)?

We got a similar bug reported in Fedora against 3.3.4 yesterday.

https://bugzilla.redhat.com/show_bug.cgi?id=820603

:[162276.196730] BUG: Bad page state in process transmission-gt  pfn:1bddff
:[162276.196735] page:ffffea0006f77fc0 count:0 mapcount:0 mapping: (null) index:0x7f2fdb962
:[162276.196737] page flags: 0x40000000000014(referenced|dirty)

Different trace, but same result.

	Dave

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