file descriptor leak in 5.2-RC
Oliver Brandmueller
ob at e-Gitt.NET
Thu Dec 25 12:46:30 PST 2003
Hi.
On Wed, Dec 24, 2003 at 11:08:46AM -0500, Robert Watson wrote:
> Hmm. So this makes multiple reports, so we definitely have a problem.
> Are you using any sort of threaded applications -- if so, which threading
> packates are you using (linuxthreads, libc_r, libkse, et al). Do you know
> if you're making use of /dev/fd/*, or /dev/std* in scripts on your system?
> Do you have any reports of unusual process exits (via signals, etc)? If
> you look at the output of lsof or fstat while the system is actively
> running, it might be interesting to get a list of the kinds of sockets in
> use. Somewhere, presumably we're slipping a file descriptor reference,
> perhaps in a failure mode that turns up frequently in your environment.
> Helping to identify what differentiates your environment from the ones
> where this doesn't turn up may help track down the problem. The areas
> I've asked you to look at above are "interesting" file descriptor handling
> cases, and the problem might well be in one of these.
- No Linuxulator.
- Tried different Threading libs.
- I do not have any unusual exits (since upgrading the RAM to a
resonable high size).
What's special is, that amavisd feeds a lot of mails to clamd via
socket. I did not do any counting by now, if the number of
kern.openfiles minus the values I get with lsof/fstat are close to the
number of mails feeded through the socket, but a rough guess is that the
number of leaked file descriptor is very close to the number of mails
that have been going through the system.
I saw in high traffic times about 6000-8000 kern.openfiles after 10-12
minutes of filtering, that sums up to about 10 per second. I will count
the number of mails fed through the system next time I try and will see
if I can see any relation (same number, twice or unrelated). I can do
the next test within the next few hours.
- Oliver
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