On 09/22/2014 07:04 PM, Hugh Dickins wrote: >> but I'm not sure what went wrong. > Most likely would be a zeroing of the radix_tree node, just as you > were experiencing zeroing of other mm structures in earlier weeks. > > Not that I've got any suggestions on where to take it from there. I've added poisoning to a few mm related structures, and managed to confirm that the issue here is indeed corruption rather than something specific with the given structures. Right now I'm looking into making KASan (Cc Andrey) to mark the poison bytes somehow so it would trigger an error on access, that way we'll know what's corruption them. Andrey, since it takes a while to trigger this corruption, could you confirm that if I kasan_poison_shadow() a few bytes I will get a KASan report on any read/write to them? Thanks, Sasha -- 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>