linux-kernel - [LKP] [x86, mm] BUG: Bad page state in process swapper/0 pfn:02500

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Date:	Mon, 17 Nov 2014 14:05:28 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Subject: [LKP] [x86, mm] BUG: Bad page state in process swapper/0  pfn:02500

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git x86/pmd-nx
commit 3622dcc2b4f4eaf23bae2511a30fc449d0e5f0d9 ("x86, mm: set NX across entire PMD at boot")


+------------------------------------------+------------+------------+
|                                          | b23dc5a7cc | 3622dcc2b4 |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 0          |
| boot_failures                            | 0          | 19         |
| BUG:Bad_page_state_in_process            | 0          | 19         |
| BUG:Bad_page_map_in_process              | 0          | 14         |
| BUG:Bad_rss-counter_state_mm:#idx:val    | 0          | 2          |
| backtrace:free_reserved_area             | 0          | 19         |
| backtrace:free_init_pages                | 0          | 19         |
| backtrace:mark_rodata_ro                 | 0          | 19         |
| backtrace:vm_munmap                      | 0          | 2          |
| backtrace:SyS_munmap                     | 0          | 2          |
| backtrace:do_execve                      | 0          | 12         |
| backtrace:SyS_execve                     | 0          | 12         |
| backtrace:do_group_exit                  | 0          | 10         |
| backtrace:SyS_exit_group                 | 0          | 10         |
| backtrace:vfs_read                       | 0          | 3          |
| backtrace:SyS_read                       | 0          | 3          |
| general_protection_fault                 | 0          | 3          |
| RIP:release_pages                        | 0          | 3          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 3          |
+------------------------------------------+------------+------------+


[    5.435374] PM: Hibernation image not present or could not be loaded.
[    5.437869] Freeing unused kernel memory: 1448K (ffffffff8215b000 - ffffffff822c5000)
[    5.439558] Write protecting the kernel read-only data: 16384k
[    5.441103] BUG: Bad page state in process swapper/0  pfn:02500
[    5.442204] page:ffffea0000094000 count:0 mapcount:-127 mapping:          (null) index:0x2
[    5.443939] flags: 0x1ffff8000000000()
[    5.444891] page dumped because: nonzero mapcount
[    5.445861] Modules linked in:
[    5.446711] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.18.0-rc4-00185-g3622dcc #1
[    5.448369] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.449450]  ffffffff81cf3ba4 ffff880037a33d78 ffffffff819ea6b0 00000000000010ac
[    5.451360]  ffffea0000094000 ffff880037a33da8 ffffffff8119b29c 0000000000000000
[    5.453289]  ffffea0000094000 0000000000000001 0000000000000000 ffff880037a33de8
[    5.455234] Call Trace:
[    5.455942]  [<ffffffff819ea6b0>] dump_stack+0x4e/0x68
[    5.456971]  [<ffffffff8119b29c>] bad_page+0xf5/0x113
[    5.457972]  [<ffffffff8119b379>] free_pages_prepare+0xbf/0x13f
[    5.459067]  [<ffffffff8119d65e>] free_hot_cold_page+0x35/0x1a0
[    5.460178]  [<ffffffff8119d878>] __free_pages+0x1b/0x24
[    5.461219]  [<ffffffff8119d930>] free_reserved_area+0xaf/0x10b
[    5.462339]  [<ffffffff8106c126>] free_init_pages+0x8d/0x99
[    5.463407]  [<ffffffff8106cb1a>] mark_rodata_ro+0xb6/0x11c
[    5.464522]  [<ffffffff819e15b5>] ? rest_init+0x89/0x89
[    5.465533]  [<ffffffff819e15d2>] kernel_init+0x1d/0xdf
[    5.466596]  [<ffffffff819f15bc>] ret_from_fork+0x7c/0xb0
[    5.467633]  [<ffffffff819e15b5>] ? rest_init+0x89/0x89
[    5.468711] Disabling lock debugging due to kernel taint
[    5.470302] Freeing unused kernel memory: 1488K (ffffffff8248c000 - ffffffff82600000)
[    5.472182] Freeing unused kernel memory: 20K (ffff8800019fb000 - ffff880001a00000)
[    5.477823] Freeing unused kernel memory: 1812K (ffff880001e3b000 - ffff880002000000)
[    5.582078] BUG: Bad page state in process udevd  pfn:0248c
[    5.582103] BUG: Bad page state in process udevd  pfn:024a0
[    5.582104] page:ffffea0000092800 count:2 mapcount:0 mapping:ffff88003ec8ea69 index:0x2
[    5.582107] flags: 0x1ffff8000080068(uptodate|lru|active|swapbacked)



	--yliu

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