Unix domain socket leak in 6-STABLE

[Marc G. Fournier]

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- --On Wednesday, June 13, 2007 09:17:36 -0700 Jeremy Chadwick 
<koitsu at FreeBSD.org> wrote:


> I've seen this kind of problem with domain sockets (at least on Linux
> with a multi-use tool called busybox) where on error conditions the
> code never bothered to close the existing socket it opened, thus
> resulting in leaks/resource exhaustion over time.  The code later got
> fixed, but a pretty nasty bug especially when the program is used in
> a lot of embedded products...
>
> In regards to FreeBSD, I remember reading some mails from Robert Watson
> last month in regards to UNIX domain socket code changes:
>
> http://monkey.org/freebsd/archive/freebsd-stable/200705/msg00200.html

'k, just to ring in here ... I can definitely attest to there being a leak 
here, as it was me that was originally burned by it ... in my case, I 
eventually was able to isolate which VPS/jail was causing it and haven't run it 
since, but was never able to determine exactly what was causing it, since there 
wasn't really anything unusual running in that jail :(

But ... based on the discussions that were had at the time, it was my 
understanding that if all applications were shut down on the server (to the 
bare minimal), eventually the kernel GC should clean up all residual sockets 
... when I did this (shut down all applications but the very bare minimum) and 
waited for 10+ minutes, socket usage never drop'd below about 4k sockets in 
use, or something like that ...

Unlike Ulrich, I wasn't running LDAP at the time, so that wasn't the cause for 
me ...

I could easily enough restart that jail if there was some more useful 
information I could get from it, but the thread kinda dwindled off over time, 
and rebooting a server ever 3 days was getting a wee bit annoying to my clients 
:)

But, if someone has something they'd like me to do to provide more info, I'm 
willing to do it (short of anything that requires DDB / console access ... that 
server is remote) ...

- ----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email . scrappy at hub.org                              MSN . scrappy at hub.org
Yahoo . yscrappy               Skype: hub.org        ICQ . 7615664
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