linux-kernel - Re: [lkp] [mm] 3f5d849cb0: page dumped because: VM_BUG_ON

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Date:	Mon, 14 Dec 2015 10:26:53 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	kernel test robot <ying.huang@...ux.intel.com>
Cc:	lkp@...org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Baron <jbaron@...mai.com>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [lkp] [mm] 3f5d849cb0: page dumped because:
 VM_BUG_ON_PAGE(!PageLocked(page))

On Mon, Dec 14, 2015 at 02:57:38PM +0800, kernel test robot wrote:
> FYI, we noticed the below changes on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> commit 3f5d849cb0b7e177c363f0c36732326f184b495b ("mm: memcontrol: switch to the updated jump-label API")
> 
> 
> +------------------------------------------------+------------+------------+
> |                                                | bf344f1f72 | 3f5d849cb0 |
> +------------------------------------------------+------------+------------+
> | boot_successes                                 | 4          | 3          |
> | boot_failures                                  | 50         | 53         |
> | IP-Config:Auto-configuration_of_network_failed | 50         | 52         |
> | BUG:kernel_test_crashed                        | 0          | 1          |
> | kernel_BUG_at_mm/filemap.c                     | 0          | 1          |
> | invalid_opcode:#[##]SMP                        | 0          | 1          |
> | RIP:unlock_page                                | 0          | 1          |
> | Kernel_panic-not_syncing:Fatal_exception       | 0          | 1          |
> +------------------------------------------------+------------+------------+
> 
> It is possible that this is a false positive, because the reproduction
> is too low 1/48.
> 
> 
> [   13.114169] page:ffff8800135f1780 count:18 mapcount:10 mapping:ffff880015b25e71 index:0x7f08a73a0
> [   13.115380] flags: 0x40068(uptodate|lruudevd[203]: worker [224] did not accept message -1 (Connection refused), kill it
> |active|swapbacked)
> [   13.117074] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))

I'm fairly certain this is this unlocked page issue:
http://www.spinics.net/lists/kernel/msg2142719.html

The fix went into Linus's tree only yesterday:
dfd01f0 ("sched/wait: Fix the signal handling fix")
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