Bug #3614
closed
dhcpd: send_packet: No buffer space available
Added by Eugene Vignanker about 10 years ago.
Updated over 8 years ago.
Affected Architecture:
amd64
Description
DHCPD service fails with "No buffer space available" error in the log after period of interface inactivity. pfSense version is 2.1.2 on x64 platform.
Reproduction steps:
1. Create a LAN, assign a static IP and start DHCP Demon on the LAN;
2. Connect an external switch to the LAN;
3. Connect a computer to the switch and obtain an IP address;
4. Disconnect the external switch and leave pfSense for a couple of hours;
5. Reconnect the external switch;
6. Attempt to get an IP address fails.
Files
- Status changed from New to Feedback
guessing this is probably either misconfigured traffic shaper, or needing to tune some parameters, maybe mbufs (kern.ipc.nmbclusters) or kern.ipc.maxsockbuf possibly.
Traffic shaper is disabled on all interfaces. I read about traffic shaper possibly causing this, but this is not the case. Attached zip archive has "netstat -m" output that shows no issues in mbuf allocation.
In my case the only way to reliably reproduce the problem is to power-off a switch that connected to the internal interface and power-on after a couple of hours (overnight, for example). I cannot reproduce the problem when switch is up all the time.
- Status changed from Feedback to Resolved
- Target version set to 2.2
someone else who could reliably replicate this issue confirmed it's fixed in 2.2
Same happens on my Soekris net6501-70:
- Release "2.2.5-DEVELOPMENT (i386) built on Tue Oct 20 09:14:46 CDT 2015".
- Notebook with Intel 82579LM ethernet adapter connected directly to the LAN port of the firewall (no switch).
Logs:
Oct 21 17:55:13 router dhcpd: DHCPDISCOVER from a0:b3:cc:26:d1:66 via em1
Oct 21 17:55:13 router dhcpd: DHCPOFFER on 192.168.229.4 to a0:b3:cc:26:d1:66 via em1
Oct 21 17:55:13 router dhcpd: send_packet: No buffer space available
Oct 21 17:55:13 router dhcpd: dhcp.c:3271: Failed to send 300 byte long packet over em1 interface.
Shortly after, garbage is logged to /var/log/dhcpd.log. Client gets no ip address.
No traffic shaper, no System Tunables changed.
Output of netstat -m :
12457/1718/14175 mbufs in use (current/cache/total)
4093/973/5066/26584 mbuf clusters in use (current/cache/total/max)
4093/967 mbuf+clusters out of packet secondary zone in use (current/cache)
0/12/12/13291 4k (page size) jumbo clusters in use (current/cache/total/max)
0/0/0/3938 9k jumbo clusters in use (current/cache/total/max)
0/0/0/2215 16k jumbo clusters in use (current/cache/total/max)
11300K/2423K/13723K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters delayed (4k/9k/16k)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
0/9/6656 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
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