On Fri, 19 Oct 2012, Kamezawa Hiroyuki wrote: > From c5849c9034abeec3f26bf30dadccd393b0c5c25e Mon Sep 17 00:00:00 2001 > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > Date: Fri, 19 Oct 2012 17:00:55 +0900 > Subject: [PATCH] hold task->mempolicy while numa_maps scans. > > /proc/<pid>/numa_maps scans vma and show mempolicy under > mmap_sem. It sometimes accesses task->mempolicy which can > be freed without mmap_sem and numa_maps can show some > garbage while scanning. > > This patch tries to take reference count of task->mempolicy at reading > numa_maps before calling get_vma_policy(). By this, task->mempolicy > will not be freed until numa_maps reaches its end. > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Looks good, but the patch is whitespace damaged so it doesn't apply. When that's fixed: Acked-by: David Rientjes <rientjes@xxxxxxxxxx> Thanks for following through on this! -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>