How to find out on which resource process _flocks ?

Hi folks,

i have a strange problem with some PHP webapp running under apache here:

The primary script uses PHP's cUrl library to perform another HTTP request to localhost, thus 2 instances of httpd are involved:

F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
5 48 4614 3990 16 0 40144 18560 flock_ S ? 0:00 /usr/sbin/httpd
5 48 4615 3990 15 0 42060 21140 - S ? 0:00 /usr/sbin/httpd

However, the secondary apache process (4614 in this case) "flock_" s on some resource and then terminates after an hour or so.
My logfiles give no indication on what resource the process blocks, so is there a straightforward way to find out?

I already tried "lsof -p 4614" which obviously shows some open files, but none of them with a lock...

Any help or pointers welcome :-)

Cheers
Andreas

Andreas Wollschlaeger schrieb:
> Hi folks,
>
> i have a strange problem with some PHP webapp running under apache here:
>
> The primary script uses PHP's cUrl library to perform another HTTP
> request to localhost, thus 2 instances of httpd are involved:
>
> F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME
> COMMAND
> 5 48 4614 3990 16 0 40144 18560 flock_ S ? 0:00
> /usr/sbin/httpd
> 5 48 4615 3990 15 0 42060 21140 - S ? 0:00
> /usr/sbin/httpd
>
> However, the secondary apache process (4614 in this case) "flock_" s on
> some resource and then terminates after an hour or so.
> My logfiles give no indication on what resource the process blocks, so
> is there a straightforward way to find out?
>
> I already tried "lsof -p 4614" which obviously shows some open files,
> but none of them with a lock...
>
> Any help or pointers welcome :-)
>
> Cheers
> Andreas

Well, a former colleagu of mine once told me that it sometimes even helpful to talk to some goldfish :-)

I just found out i have to apply lsof on the PARENT process, which obviously holds a lock
(the PHP session cache file) in this case.

Cheers and have good day y'all
Andreas