On Wed, May 24, 2017 at 08:46:57AM -0400, Jan Stancek wrote: > > > ----- Original Message ----- > > Hi, > > > > I'm seeing rare crashes during NFS cthon with krb5 auth. After > > some digging I arrived at potential problem with sha1-avx2. > > Adding more sha1_avx2 experts to CC. > > > > > Problem appears to be that sha1_transform_avx2() reads beyond > > number of blocks you pass, if it is an odd number. It appears > > to try read one block more. This creates a problem if it falls > > beyond a page and there's nothing there. > > As noted in my reply, worst case appears to be read ahead > of up to 3 SHA1 blocks beyond end of data: > http://marc.info/?l=linux-crypto-vger&m=149373371023377 > > +----------+---------+---------+---------+ > | 2*SHA1_BLOCK_SIZE | 2*SHA1_BLOCK_SIZE | > +----------+---------+---------+---------+ > ^ page boundary > ^ data end > > It is still reproducible with 4.12-rc2. Can someone from Intel please look into this? Otherwise we'll have to disable sha-avx2. Thanks, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
