Date: Sat, 17 Sep 2005 16:58:58 GMT From: Bob Frazier <bobf@mrp3.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/86261: 'out of buffer space' after many PPPoE re-dial attempts, connectivity lost Message-ID: <200509171658.j8HGwwnJ060799@www.freebsd.org> Resent-Message-ID: <200509171700.j8HH0Op0091435@freefall.freebsd.org>
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>Number: 86261
>Category: kern
>Synopsis: 'out of buffer space' after many PPPoE re-dial attempts, connectivity lost
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Sep 17 17:00:24 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Bob Frazier
>Release: 5.4-STABLE (7/21/2005)
>Organization:
SFT INc.
>Environment:
FreeBSD BSDServer.SFT.local 5.4-STABLE FreeBSD 5.4-STABLE #0: Sat Jul 23 04:33:01 PDT 2005 root@BSDServer.SFT.local:/usr/obj/usr/src/sys/MY_KERNEL i386
>Description:
At various times my DSL service provider loses connectivity, and ppp must re-dial the PPPoE connection to maintain it. After the system has been running for quite some time. uptime would have likely been since the last kernel build (around 7/22/2005). Since that time period, countless re-dials by ppp have been performed.
At approximately midnight, I had a series of redials take place, which ultimately resulted in the following errors in /var/log/messages, and a complete loss of internet connectivity.
Sep 16 23:59:13 BSDServer routed[289]: ignore RTM_CHANGE without mask
Sep 16 23:59:13 BSDServer routed[289]: ignore RTM_CHANGE without mask
(these two errors happen all of the time whenever the ppp connection is established)
Sep 16 23:59:25 BSDServer ppp[230]: tun0: Warning: deflink: Reducing configured MRU from 1500 to 1492
(this is also normal)
Sep 17 00:01:00 BSDServer routed[289]: Send sendto(tun0, 216.175.112.1.520): No buffer space available
Sep 17 00:01:30 BSDServer routed[289]: Send sendto(tun0, 216.175.112.1.520): No buffer space available
Sep 17 00:03:30 BSDServer last message repeated 4 times
The previous sequence then repeated itself every few minutes as ppp attempted to re-dial the PPPoE connection indefinitely. I am using a Zyxel DSL modem through earthlink.
>How-To-Repeat:
I have only seen this problem once before, and it was caused by the same thing - ISP drops connection a sufficient number of times until ppp has re-dialed enough to cause the 'no buffer space available' error. An extremely unreliable DSL connection (constantly dropping) with a lot of internet traffic and connections to services like IRC that stay up for days at a time over this connection, gigabytes of data transferred, services like http and ftp and ssh providing content, etc. connected to the internet for several weeks using PPPoE over a DSL connection where 'ppp' is providing the PPPoE login. At some point a resource limit is exceeded, and then all internet connectivity is lost.
>Fix:
rebooting the system restored connectivity in both cases. This problem never occurred prior to FreeBSD 5.3-RELEASE, possibly not even until FreeBSD 5.4-RELEASE.
>Release-Note:
>Audit-Trail:
>Unformatted:
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