2014-09-27 7:02 GMT+04:00 Sasha Levin <sasha.levin@xxxxxxxxxx>: > 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? > That's right. Note that poison value has to be negative. Address and size of poisoned area has to be aligned to 8 bytes. -- Best regards, Andrey Ryabinin -- 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>