Re: Boot hangs starting postfix

[YONETANI Tomokazu <qhwt+dragonfly-bugs@xxxxxxxxxx>]

On Sun, Jun 13, 2004 at 12:13:41PM -0700, Matthew Dillon wrote:
>     Please try this debugging patch.  It doesn't fix anything but it adds
>     some debugging printfs that I am hoping will help Joerg, Hiten, and I
>     figure out what is going on.  I also tsleep() for a few ticks to 
>     (hopefully) prevent livelock from locking up the whole system.
>  
>     What I am guessing you will see is a continuous stream of messages
>     on the console from two different PIDs when it gets to the postfix
>     startup, but you should still be able to ssh into the box and take
>     a snapshot by running 'dmesg'.
> 
>     p.s. if there is some sort of race going on the printf() might interfere
>     with it and stop the livelock, but if that occurs it should not be
>     considered fixed :-).
> 
> 						-Matt

[joseph, if you happen to have corrupted messages in the queue, please don't
remove it before giving other people a clue to fix this lock up.]

Yes, this at least keeps ssh alive, and the following messages repeated
until I removed corrupted messages (files in /var/spool/postfix/corrupt/)

Jun 14 10:46:55 fred /kernel: lf_setlock: 0xcf8df6d4 pid 0 type 3 flags 00000030
 [00000000,7fffffffffffffff]
Jun 14 10:46:55 fred /kernel: lf_setlock: 0xcf8df7f4 pid 0 type 3 flags 00000030
 [00000000,7fffffffffffffff]

I was so stupid that I didn't keep the corrupted messages, and
now older kernel(without your patch) doesn't lock up anymore!
Just creating pair of empty files in the corrupt/ directory doesn't
reproduce it.

> Index: kern_lockf.c
> ===================================================================
[snip]