skbuff alloc of size 1926 failed

[andrzejmleczko@…]

After 4 days of uptime i got this kind of errors in dmesg:

size 1926 failed
skbuff alloc of size 1926 failed
skbuff alloc of size 1926 failed
alloc_pages_slowpath: 452 callbacks suppressed
swapper: page allocation failure. order:0, mode:0x4020
Call Trace:[<802537f4>] 0x802537f4
[<802537f4>] 0x802537f4
[<800adf34>] 0x800adf34
[<800d0018>] 0x800d0018
[<80076374>] 0x80076374
[<800d0b64>] 0x800d0b64
[<800d1944>] 0x800d1944
[<834a4080>] 0x834a4080
[<801cb76c>] 0x801cb76c
....

Logs are attached to ticket

using:
ATTITUDE ADJUSTMENT (bleeding edge, r28458) ----------
DIR-825B2

[Andrzej Mleczko <andrzejmleczko@…>]

I forgot to mention that system is running on full ext-root

[jow]

You are out of RAM. Limit the maximum allowed number of conntrack entries to 4096 and reduce the tcp idle timeout to 300 in sysctl.conf. No, swap does not help here.

[Andrzej Mleczko <andrzejmleczko@…>]

I'll try this. Thx :)

[anonymous123]

Just had the same issue on a TP-Link WR741ND on OpenWRT Backfire [r28263]. I did some iperf tests yesterday between one WR741ND, a WR1043ND, a Dlink DIR300, a Nokia N900 and a laptop (AR928X Wireless Network Adapter (PCI-Express) (rev 01)). This morning the laptop was still connected to the WR741ND, I could also ping its master interface just fine (usually < 5ms latency), the one I was connected to.

dmesg:

skbuff alloc of size 1926 failed
[...]
skbuff alloc of size 1926 failed
skbuff alloc of size 1926 failed
skbuff alloc of size 1926 failed
skbuff alloc of size 1926 failed
eth1: out of memory
skbuff alloc of size 1926 failed
ieee80211 phy0: failed to reallocate TX buffer
ieee80211 phy0: failed to copy skb for wlan1

There still seems to be enough RAM left (at least this morning) on the according WR741ND:

# free
              total         used         free       shared      buffers
  Mem:        29372        15884        13488            0         1132
 Swap:            0            0            0
Total:        29372        15884        13488

[jow]

Milestone Attitude Adjustment 12.09 deleted