Re: [Bug 203715] New: BUG: unable to handle kernel NULL pointer dereference under stress (possibly related to https://lkml.org/lkml/2019/5/24/292 ?)

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On Thu, Jun 06, 2019 at 03:44:24PM +0100, Mel Gorman wrote:
> > (I applied the patch on top of e577c8b64d58fe307ea4d5149d31615df2d90861,
> > right?)
> 
> Please try the following on top of 5.2-rc3
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 9e1b9acb116b..69f4ddfddfa4 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -277,8 +277,7 @@ __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source,
>  	}
>  
>  	/* Ensure the end of the pageblock or zone is online and valid */
> -	block_pfn += pageblock_nr_pages;
> -	block_pfn = min(block_pfn, zone_end_pfn(zone) - 1);
> +	block_pfn = min(pageblock_end_pfn(block_pfn), zone_end_pfn(zone) - 1);
>  	end_page = pfn_to_online_page(block_pfn);
>  	if (!end_page)
>  		return false;
> @@ -289,7 +288,7 @@ __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source,
>  	 * is necessary for the block to be a migration source/target.
>  	 */
>  	do {
> -		if (pfn_valid_within(pfn)) {
> +		if (pfn_valid(pfn)) {
>  			if (check_source && PageLRU(page)) {
>  				clear_pageblock_skip(page);
>  				return true;

Any news with this patch?

-- 
Mel Gorman
SUSE Labs




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