On Mon, Jul 11 2016 at 4:31am -0400, Matthias Dahl <ml_linux-kernel@xxxxxxxxxxxxxxxx> wrote: > Hello, > > I made a few more tests and here my observations: > > - kernels 4.4.8 and 4.5.5 show the same behavior > > - the moment dd starts, memory usage spikes rapidly and within a just > a few seconds has filled up all 32 GiB of RAM > > - dd w/ direct i/o works just fine > > - mkfs.ext4 unfortunately shows the same behavior as dd w/o direct i/o > and such makes creation of an ext4 fs on dm-crypt a game of luck > > (much more exposed so with e2fsprogs 1.43.1) > > I am kind of puzzled that this bug has seemingly gone so long unnoticed > since it is rather severe and makes dm-crypt unusable to a certain > degree > for fs encryption (or at least the initial creation of the fs). Am I > missing something here or doing something terribly stupid? Not clear. Certainly haven't had any reports of memory leaks with dm-crypt. Something must explain the execessive nature of your leak but it isn't a known issue. Have you tried running with kmemleak enabled? -- 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>