-----BEGIN PGP SIGNED MESSAGE----- Hash: RIPEMD160 Jonas Meurer wrote: > On 05/04/2006 Ruben Garcia wrote: >> I have been using encrypted swap for some time now on an amd32 without >> any problems. >> I recently switched to an amd64 and I'm getting oopses every six hours >> or so. >> I tried loop->dm-crypt-≥swap, which is unsafe. > > do you mean, that you use a swap file, not a swap partition? > I tried both. I found later that using a swap file was known to oops, but I can't find the reference now. I can look next week if you are interested. >> I then tried dmcrypt->swap, which is correct according to >> http://www.saout.de/misc/dm-crypt/ >> >> Both of them are giving me the oopses. > > this means that both, an encrypted swap file, and an encrypted swap > partition cause the oopses? > Yes. I then switched to unencrypted swap, and have not had a problem for a few days, so I'm quite sure it is due to encrypted swap. >> Does anybody know if there might be a problem with amd64 and encrypted > swap? > > i'm member of the debian cryptsetup maintainer team, and we got a > bugreport about this issue. for the submitter, encrypted swap files > (over loop, no other way to access files with dm-crypt) cause oopses, > but encrypted swap partitions don't do. > Yes, it's because in that case there may be a kmalloc() which produces a second call to kswapd, which then oopses because it is already called. > I'm able to reproduce this bug, so yes, at least swap files mounted as > loop device crash the system. > I run debian amd64, but the submitter of the bugreport uses an i386 > system, thus i don't think that it's related to amd64. > Yes, I didn't have any problem with encrypted swap in i386 either. I'm using Ubuntu 5.10, and just changed the kernel to 2.6.16.1. > please see http://bugs.debian.org/351393 for more information about the > bugreport. > > here is a script which causes my system to crash with encrypted swap > file, while it doesn't crash with encrypted swap partition: > # perl -e ' <at> foo = (); push( <at> foo, "x"x1000) for (1..10**5); > fork for (1..10**5); sleep 60' > > ... > jonas I'm going to be away next week. I will add the encrypted swap partition again when I come back and run your program. I'll post if I get it to crash. How long does it take? How much RAM do you have? I have 1Gb ram and 1Gb swap. I get the oopses after using arount 200Mb of the swap partition, using freenet. I'll report again afterwards. Thanks! -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFENkXTjJvgg3iy84QRAy9VAJ45lJ7OaRhjyNJdJqbRcu46l+iHPQCeOjqR sdI4+G/etSKwtd/waBAIurw= =2aol -----END PGP SIGNATURE----- --------------------------------------------------------------------- - http://www.saout.de/misc/dm-crypt/ To unsubscribe, e-mail: dm-crypt-unsubscribe@xxxxxxxx For additional commands, e-mail: dm-crypt-help@xxxxxxxx
