Re: [PATCH v2 1/3] mm/hwpoison: fix bug triggered by unpoison empty zero page

[Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>]

On Tue, Aug 27, 2013 at 10:39:29AM +0800, Wanpeng Li wrote:
> v1 -> v2:
>  * ignore empty zero page for madvise_hwpoison directly
> 
> [   57.579580] Injecting memory failure for page 0x19d0 at 0xb77d2000
> [   57.579824] MCE 0x19d0: non LRU page recovery: Ignored
> [   91.290453] MCE: Software-unpoisoned page 0x19d0
> [   91.290456] BUG: Bad page state in process bash  pfn:019d0
> [   91.290466] page:f3461a00 count:0 mapcount:0 mapping:  (null) index:0x0
> [   91.290467] page flags: 0x40000404(referenced|reserved)
> [   91.290469] Modules linked in: nfsd auth_rpcgss i915 nfs_acl nfs lockd video drm_kms_helper drm bnep rfcomm sunrpc bluetooth psmouse parport_pc ppdev lp serio_raw fscache parport gpio_ich lpc_ich mac_hid i2c_algo_bit tpm_tis wmi usb_storage hid_generic usbhid hid e1000e firewire_ohci firewire_core ahci ptp libahci pps_core crc_itu_t
> [   91.290486] CPU: 3 PID: 2123 Comm: bash Not tainted 3.11.0-rc6+ #12
> [   91.290487] Hardware name: LENOVO 7034DD7/        , BIOS 9HKT47AUS 01//2012
> [   91.290488]  00000000 00000000 e9625ea0 c15ec49b f3461a00 e9625eb8 c15ea119 c17cbf18
> [   91.290491]  ef084314 000019d0 f3461a00 e9625ed8 c110dc8a f3461a00 00000001 00000000
> [   91.290494]  f3461a00 40000404 00000000 e9625ef8 c110dcc1 f3461a00 f3461a00 000019d0
> [   91.290497] Call Trace:
> [   91.290501]  [<c15ec49b>] dump_stack+0x41/0x52
> [   91.290504]  [<c15ea119>] bad_page+0xcf/0xeb
> [   91.290515]  [<c110dc8a>] free_pages_prepare+0x12a/0x140
> [   91.290517]  [<c110dcc1>] free_hot_cold_page+0x21/0x110
> [   91.290519]  [<c11123c1>] __put_single_page+0x21/0x30
> [   91.290521]  [<c1112815>] put_page+0x25/0x40
> [   91.290524]  [<c11544e7>] unpoison_memory+0x107/0x200
> [   91.290526]  [<c104a537>] ? ns_capable+0x27/0x60
> [   91.290528]  [<c1155720>] hwpoison_unpoison+0x20/0x30
> [   91.290530]  [<c1178266>] simple_attr_write+0xb6/0xd0
> [   91.290532]  [<c11781b0>] ? generic_fh_to_dentry+0x50/0x50
> [   91.290535]  [<c1158c60>] vfs_write+0xa0/0x1b0
> [   91.290537]  [<c11781b0>] ? generic_fh_to_dentry+0x50/0x50
> [   91.290539]  [<c11590df>] SyS_write+0x4f/0x90
> [   91.290549]  [<c15f9a81>] sysenter_do_call+0x12/0x22
> [   91.290550] Disabling lock debugging due to kernel taint
> 
> Testcase:
> 
> #define _GNU_SOURCE
> #include <stdlib.h>
> #include <stdio.h>
> #include <sys/mman.h>
> #include <unistd.h>
> #include <fcntl.h>
> #include <sys/types.h>
> #include <errno.h>
> 
> #define PAGES_TO_TEST 1
> #define PAGE_SIZE	4096
> 
> int main(void)
> {
> 	char *mem;
> 
> 	mem = mmap(NULL, PAGES_TO_TEST * PAGE_SIZE,
> 			PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
> 
> 	if (madvise(mem, PAGES_TO_TEST * PAGE_SIZE, MADV_HWPOISON) == -1)
> 		return -1;
> 
> 	munmap(mem, PAGES_TO_TEST * PAGE_SIZE);
> 
> 	return 0;
> }
> 
> There is one page reference count for default empty zero page, madvise_hwpoison
> add another one by get_user_pages_fast. memory_hwpoison reduce one page reference
> count since it's a non LRU page. unpoison_memory release the last page reference
> count and free empty zero page to buddy system which is not correct since empty
> zero page has PG_reserved flag. This patch fix it by ignore empty zero page for 
> madvise_hwpoison directly. 
> 
> Suggested-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>

Thank you.

Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>

> ---
>  mm/madvise.c        | 2 ++
>  mm/memory-failure.c | 3 +++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/mm/madvise.c b/mm/madvise.c
> index 212f5f1..a20764c 100644
> --- a/mm/madvise.c
> +++ b/mm/madvise.c
> @@ -352,6 +352,8 @@ static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
>  		int ret = get_user_pages_fast(start, 1, 0, &p);
>  		if (ret != 1)
>  			return ret;
> +		if (page_to_pfn(p) == my_zero_pfn(0))
> +			continue;
>  		if (bhv == MADV_SOFT_OFFLINE) {
>  			pr_info("Soft offlining page %#lx at %#lx\n",
>  				page_to_pfn(p), start);
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 7cdabc0..68cbca0 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1331,6 +1331,9 @@ int unpoison_memory(unsigned long pfn)
>  	if (!pfn_valid(pfn))
>  		return -ENXIO;
>  
> +	if (pfn == my_zero_pfn(0))
> +		return 0;
> +
>  	p = pfn_to_page(pfn);
>  	page = compound_head(p);

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