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Date:	Thu, 22 May 2014 11:41:00 -0400
From:	Dave Jones <davej@...hat.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 3.15.0-rc6: VM_BUG_ON_PAGE(PageTail(page), page)

On Thu, May 22, 2014 at 05:08:09PM +0200, Vlastimil Babka wrote:
 
 > > RIP: 0010:[<ffffffffbb718d98>]  [<ffffffffbb718d98>] PageTransHuge.part.23+0xb/0xd
 > > Call Trace:
 > >   [<ffffffffbb1728a3>] isolate_migratepages_range+0x7a3/0x870
 > >   [<ffffffffbb172d90>] compact_zone+0x370/0x560
 > >   [<ffffffffbb173022>] compact_zone_order+0xa2/0x110
 > >   [<ffffffffbb1733f1>] try_to_compact_pages+0x101/0x130
 > > ...
 > > Code: 75 1d 55 be 6c 00 00 00 48 c7 c7 8a 2f a2 bb 48 89 e5 e8 6c 49 95 ff 5d c6 05 74 16 65 00 01 c3 55 31 f6 48 89 e5 e8 28 bd a3 ff <0f> 0b 0f 1f 44 00 00 55 48 89 e5 41 57 45 31 ff 41 56 49 89 fe
 > > RIP  [<ffffffffbb718d98>]
 > >
 > > That BUG is..
 > >
 > > 413 static inline int PageTransHuge(struct page *page)
 > > 414 {
 > > 415         VM_BUG_ON_PAGE(PageTail(page), page);
 > > 416         return PageHead(page);
 > > 417 }
 > 
 > Any idea which of the two PageTransHuge() calls in 
 > isolate_migratepages_range() that is? Offset far in the function suggest 
 > it's where the lru lock is already held, but I'm not sure as decodecode 
 > of your dump and objdump of my own compile look widely different.

Yeah, the only thing the code: matches is the BUG() which is in another section.
(see end of file at http://paste.fedoraproject.org/104155/40077293/raw/)

Maybe you can make more sense of that disassembly than I can..

	Dave


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