On Mon, May 07, 2012 at 01:37:43PM +0200, Johannes Weiner wrote: > From: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx> > > When bootmem releases an unaligned chunk of memory at the beginning of > a node to the page allocator, it iterates from that unaligned PFN but > checks an aligned word of the page bitmap. The checked bits do not > correspond to the PFNs and, as a result, reserved pages can be freed. > > Properly shift the bitmap word so that the lowest bit corresponds to > the starting PFN before entering the freeing loop. > > This bug has been around since 41546c1 "bootmem: clean up > free_all_bootmem_core" (2.6.27) without known reports. > > Signed-off-by: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Tejun Heo <tj@xxxxxxxxxx> Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>