Hi! Maybe this is the same issue as reported in thread "Re: [dm-devel] Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt". Because I've been subscribed to this mailing list just for a few days, and there doesn't seem to be a mailing list archive on gmane, I don't have the first posting of that thread. Anyway: I observed a reproducible bug after switching from Linux 2.6.24 to the latest 2.6.25-rc4 kernel. On Linux 2.6.24 I had no such problem. When writing to a slightly bigger DM-Crypt-LUKS volume, I experience lock-ups in the form of stuck, non-terminating, non-"kill -9"-able processes. These are the steps to reproduce it on my Debian-like system with a vanilla 2.6.25-rc4 kernel; no X-windows, no 3rd party or non-GPL modules installed (more system details below): ***** root@mymachine:/$ .... # Create an empty 3000 MiB container file in /tmp: cd /tmp dd if=/dev/zero of=crypt.img bs=1M count=3000 # setup loop-device: LOOP=`losetup -s -f crypt.img` echo "Using loop device $LOOP" # creating DM-LUKS-volume: cryptsetup -c aes-xts-plain -s 384 luksFormat $LOOP cryptsetup luksOpen $LOOP test-mapping # I used an ext2-FS mkfs.ext2 -m 0 /dev/mapper/test-mapping mount /dev/mapper/test-mapping /mnt # Now, to reproduce the hang, I have to write to a file # on the mounted volume, but more than once: dd if=/dev/zero of=/mnt/testFile bs=1M count=2500 # seems to work.... And again: dd if=/dev/zero of=/mnt/testFile bs=1M count=2500 # .... .... ... Nothing. Hangs.... # (If not: trying a few more times seems to always work # producing the hang... ****** CTRL-C ... nothing Other terminal: killall dd ... nothing killall -9 dd ... nothing ps -aux shows dd in state "D" or "D+"... ****** Here are a few details describing my computer setup: PC style system AMD64 (64-Bit-mode) SATA harddisk 3GiB RAM running a Kubuntu 7.10 (Gutsy) with a Vanilla Linux 2.6.25-rc4 If the above behavior can't easily be reproduced, I'd be happy to provide more information as requested. (File-attachements seem not to work on this list) HTH, Ulrich --------------------------------------------------------------------- dm-crypt mailing list - http://www.saout.de/misc/dm-crypt/ To unsubscribe, e-mail: dm-crypt-unsubscribe@xxxxxxxx For additional commands, e-mail: dm-crypt-help@xxxxxxxx
