linux-kernel - Re: mm,x86: warning at arch/x86/mm/pat.c:781 untrack

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Message-ID: <5393D995.8010805@oracle.com>
Date:	Sat, 07 Jun 2014 23:33:41 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	suresh.b.siddha@...el.com, Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: mm,x86: warning at arch/x86/mm/pat.c:781 untrack_pfn+0x65/0xb0()

On 04/11/2014 08:50 AM, Sasha Levin wrote:
> Hi all,
> 
> While fuzzing with trinity inside a KVM tools guest running the latest -next
> kernel I've stumbled on the following:

Ping? Still happening (rarely on -next):

[ 5818.038245] WARNING: CPU: 4 PID: 22726 at arch/x86/mm/pat.c:781 untrack_pfn+0x65/0xb0()
[ 5818.044203] Modules linked in:
[ 5818.045172] CPU: 4 PID: 22726 Comm: trinity-c239 Tainted: G        W     3.15.0-rc8-next-20140606-sasha-00021-ga9d3a0b-dirty #596
[ 5818.048317]  0000000000000009 ffff8800024d3be8 ffffffff9e50fe6b 0000000000000001
[ 5818.050516]  0000000000000000 ffff8800024d3c28 ffffffff9b15f96c ffff8800024d3c38
[ 5818.052567]  ffff88000203f400 0000000000000000 ffff8800024d3d68 ffff8800024d3d68
[ 5818.053785] Call Trace:
[ 5818.054483] dump_stack (lib/dump_stack.c:52)
[ 5818.055586] warn_slowpath_common (kernel/panic.c:430)
[ 5818.056763] warn_slowpath_null (kernel/panic.c:465)
[ 5818.057789] untrack_pfn (arch/x86/mm/pat.c:781 (discriminator 3))
[ 5818.059412] unmap_single_vma (mm/memory.c:1327)
[ 5818.061530] ? pagevec_lru_move_fn (include/linux/pagevec.h:44 mm/swap.c:435)
[ 5818.063412] unmap_vmas (mm/memory.c:1377 (discriminator 1))
[ 5818.064610] unmap_region (mm/mmap.c:2363 (discriminator 3))
[ 5818.065453] ? validate_mm_rb (mm/mmap.c:404)
[ 5818.066422] ? vma_rb_erase (mm/mmap.c:449 include/linux/rbtree_augmented.h:219 include/linux/rbtree_augmented.h:227 mm/mmap.c:488)
[ 5818.067316] do_munmap (mm/mmap.c:3359 mm/mmap.c:2561)
[ 5818.068126] move_vma (mm/mremap.c:313)
[ 5818.069000] SyS_mremap (mm/mremap.c:446 mm/mremap.c:508 mm/mremap.c:477)
[ 5818.069839] tracesys (arch/x86/kernel/entry_64.S:542)


Thanks,
Sasha
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