Hi Martin
On 4/26/07, Martin Michlmayr <[EMAIL PROTECTED]> wrote:
Gordon, can you check if LUKS still doesn't work under heavy load with
2.6.21 (I can give you .debs if you want)?
Unfortunately, I can still trigger the problem, although instead of
cryptsetup asking me for the passphrase three times and then returning
"Command failed: No key available with this passphrase", it now just
fails with "Command failed". The problem is intermittent though. Below
are some examples of trying to access the LUKS partition under heavy
load. In the first case, the access works, but then a little while
later, it fails. In the third case, it works again. I sure that the
second case was not a case of typing in the passphrase incorrectly
because the problem is repeatable as shown in the forth case.
[EMAIL PROTECTED]:~$ uname -a
Linux LKG7102D7 2.6.21-1-ixp4xx #1 Thu Apr 26 20:40:53 MDT 2007
armv5tel GNU/Linux
[EMAIL PROTECTED]:~$ uptime
08:57:11 up 9:19, 3 users, load average: 3.94, 1.54, 0.81
[EMAIL PROTECTED]:~$ sudo cryptsetup luksOpen /dev/sda2 x
Enter LUKS passphrase:
key slot 0 unlocked.
Command successful.
[EMAIL PROTECTED]:~$ sudo cryptsetup luksClose x
[EMAIL PROTECTED]:~$ uptime
08:57:49 up 9:20, 3 users, load average: 4.79, 2.05, 1.01
[EMAIL PROTECTED]:~$ uptime
09:04:02 up 9:26, 3 users, load average: 3.93, 3.46, 1.98
[EMAIL PROTECTED]:~$ sudo cryptsetup luksOpen /dev/sda2 x
Enter LUKS passphrase:
Command failed.
[EMAIL PROTECTED]:~$ uptime
09:04:29 up 9:27, 3 users, load average: 4.29, 3.57, 2.06
[EMAIL PROTECTED]:~$ uptime
09:06:35 up 9:29, 3 users, load average: 2.27, 3.01, 2.03
[EMAIL PROTECTED]:~$ sudo cryptsetup luksOpen /dev/sda2 x
Enter LUKS passphrase:
key slot 0 unlocked.
Command successful.
[EMAIL PROTECTED]:~$ uptime
09:07:14 up 9:29, 3 users, load average: 2.61, 2.99, 2.07
[EMAIL PROTECTED]:~$ uptime
09:18:58 up 9:41, 3 users, load average: 2.52, 2.47, 2.17
[EMAIL PROTECTED]:~$ sudo cryptsetup luksOpen /dev/sda2 x
Enter LUKS passphrase:
Command failed.
[EMAIL PROTECTED]:~$ uptime
09:19:31 up 9:42, 3 users, load average: 3.18, 2.63, 2.23
To trigger the heavy load conditions, I am compiling apt on the NSLU2.
Occasionally, to up the load on the NSLU2, I run Linus's test program
that he used to track down the mmap problem, but the problem does
trigger if I am just compiling apt. Also, the load does not need to be
that high to trigger the problem:
[EMAIL PROTECTED]:~$ uptime
09:24:12 up 9:46, 3 users, load average: 1.93, 2.26, 2.17
[EMAIL PROTECTED]:~$ sudo cryptsetup luksOpen /dev/sda2 x
Enter LUKS passphrase:
Command failed.
[EMAIL PROTECTED]:~$ uptime
09:25:35 up 9:48, 3 users, load average: 1.69, 2.13, 2.13
[EMAIL PROTECTED]:~$ free
total used free shared buffers cached
Mem: 29912 28800 1112 0 104 4640
-/+ buffers/cache: 24056 5856
Swap: 88316 18640 69676
I have not been able to get the problem to occur under light load conditions.
This problem looks like it is going to be a tricky one to track down.
Gordon
--
Gordon Farquharson
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