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Bug #2534

closed

Network connections freeze with heavy email traffic

Added by ftigeot about 11 years ago. Updated about 11 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
03/27/2013
Due date:
% Done:

100%

Estimated time:

Description

When under heavy load (receiving a stream of mails at 1Gb/s from a LAN machine), network connections freeze on a mail relay machine.
This machine is also a PPP/ADSL router.

The console shows this message:
Warning, objcache(cluster mbuf): Exhausted!

netstat -m output:
5306/4480 mbuf clusters in use (current/max)

Some processes (most often ppp and sendmail) end up in a weird state, as shown by these top outputs:

PID USERNAME   NICE  SIZE    RES    STATE CPU  TIME   CTIME    CPU COMMAND
 1879 root         0    14M  2864K     CPU0  0   0:00    0:00  0.34% top
  260 root         0    24M  2476K  tunread  2   0:05    0:05  0.00% ppp
PID USERNAME   NICE  SIZE    RES    STATE CPU  TIME   CTIME    CPU COMMAND
82699 ftigeot      0    15M  2872K     CPU3  3   0:00    0:00  0.39% top
  265 root         0    25M  1172K objcache  1 154:06  154:06  0.00% ppp

Only a reboot allows the machine to resume network operations.

A core dump is available in leaf:~ftigeot/crash/crash.objcache

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