Experimental Physics and
Industrial Control System

We are experiencing problems here with VxWorks 5.5 and EPICS 3.13.10. In
short, if a running IOC loaded with reasonable CA traffic is disconnected
from the network for 5 seconds and then reconnected, the network connection
will die forever (until reboot). No UDP, TCP, ICMP packets are processed by
the IOC anymore.

In more detail:
Whenever this happens, the serial debug console outputs messages like:

sendto failed: S_errno_ENOBUFS
0x195c160 (CA_online): ../online_notify.c: CA beacon error was
"S_errno_ENOBUFS"

Another observation is that I see several TCP and UDP sockets with 0.0.0.0
addresses, even before I let the system die. See below:

TEST-VME-ANDY > inetstatShow
Active Internet connections (including servers)
PCB Proto Recv-Q Send-Q Local Address Foreign Address (state)
-------- ----- ------ ------ ------------------ ------------------ -------
1d392c0 TCP 0 0 129.129.129.245.5064 129.129.128.46.59589 ESTABLISHED
1d393c8 TCP 0 0 0.0.0.0.5064 0.0.0.0.0 LISTEN
1d39134 TCP 0 0 129.129.129.245.1034 129.129.128.46.6500 CLOSE_WAIT
1d38fa8 TCP 0 0 0.0.0.0.111 0.0.0.0.0 LISTEN
1d38d98 TCP 0 0 0.0.0.0.513 0.0.0.0.0 LISTEN
1d38b88 TCP 0 0 0.0.0.0.23 0.0.0.0.0 LISTEN
1d394d0 UDP 0 0 0.0.0.0.1028 0.0.0.0.0
1d3944c UDP 0 0 0.0.0.0.5064 0.0.0.0.0
1d3923c UDP 0 0 0.0.0.0.1027 0.0.0.0.0
1d38f24 UDP 0 0 0.0.0.0.1026 0.0.0.0.0
1d391b8 UDP 0 0 0.0.0.0.5065 0.0.0.0.0
1d38ea0 UDP 0 0 0.0.0.0.111 0.0.0.0.0
value = 1 = 0x1
TEST-VME-ANDY >

Finally: it doesn't seem to be an mbuf or cluster allocation problem. We are
using higher values than VxWorks default. When I check with mbufShow,
ifShow, inetstatShow, netStackDataPoolShow and netStackSysPoolShow, no
unusual numbers are shown, except:

I can see with netStackDataPoolShow, that the 128byte clusters decrease
dramatically from initially 400 free clusters to 250 or with more network
load even down to 0 after a disconnect/reconnect. However, they don't have
to become 0 in order to kill the network stack.

All help is appreciated.
Andreas

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