qmail/plesk problem

Jeremy Kitchen · *nix forums Guru Wannabe Joined: 14 Jan 2005 Posts: 212

On Tuesday 18 July 2006 16:12, you wrote:

jasonm@layeredtech.com · *nix forums beginner Joined: 18 Jul 2006 Posts: 1

We have come upon an error in qmail, with splogger, running on plesk.
It seem like the
qmail log is filling up the fifo queue, and the freezes the processes.

This is the plesks solution for this problem:
"the problem is rare but we've faced it before: for some reason qmail
stops to work after some time. The reason is unknown but most likely it
is hardware problem or very low level linux kernel bug which appears
only in rare conditions.

The only way to make freezed qmail to work again is to do 'cat' on
qmail-send's 0 fd:

[root@h17 ~]# ps axww | grep qmail-send
6714 pts/2 S 0:00 qmail-send
[root@h17 ~]# cat /proc/6714/fd/0 > /dev/null

and qmail immidiately starts to work normally. But this action breaks
mail logging -- maillog stops updating with info from qmail.

As I already told the reason is unknown and you are the second person
who have this problem. Last time I saw it almost 2 years ago -- we've
tried to resolve the problem using all available ways: qmail
recompilation, Linux kernel upgrading, tuning kernel parameters but no
luck. Only migration to another hardware resolved the problem.

I suggest you to check hardware of the server very carefully and do all
possible tests on it.

Currently, I've ran 'screen' session where 'cat /proc/6714/fd/0

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