Public bug reported:
tc filter seems still leak with ubuntu kernel 4.15.0-36-generic,
it can be reproduced with the following steps.
```
tc qdisc add dev eth0 ingress
tc filter add dev eth0 ingress protocol ip prio 1 handle 800::1 u32 match ip
dst 192.168.5.113/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
tc filter add dev eth0 ingress protocol ip prio 1 handle 800::2 u32 match ip
dst 192.168.5.46/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
tc filter del dev eth0 ingress protocol ip prio 1 handle 800::1 u32 match ip
dst 192.168.5.113/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
tc filter add dev eth0 ingress protocol ip prio 1 handle 800::1 u32 match ip
dst 192.168.5.113/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
```
the last command will get this error
```
RTNETLINK answers: No space left on device
We have an error talking to the kernel
```
upstream 4.15(eol) also have this issue, but 4.16.2 fixed, and ubuntu 4.15.0-36
already patched upstream 4.16.2 fix patch.
however this issue still exist, I think the difference between 4.15 and 4.16
caused this issue.
please kindly help check it.
Thanks.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: tc
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Description changed:
- tc filter seems still leaks with ubuntu kernel 4.15.0-36-generic,
+ tc filter seems still leak with ubuntu kernel 4.15.0-36-generic,
it can be reproduced with the following steps.
```
tc qdisc add dev eth0 ingress
tc filter add dev eth0 ingress protocol ip prio 1 handle 800::1 u32 match ip
dst 192.168.5.113/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
tc filter add dev eth0 ingress protocol ip prio 1 handle 800::2 u32 match ip
dst 192.168.5.46/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
tc filter del dev eth0 ingress protocol ip prio 1 handle 800::1 u32 match ip
dst 192.168.5.113/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
tc filter add dev eth0 ingress protocol ip prio 1 handle 800::1 u32 match ip
dst 192.168.5.113/32 police rate 10Mbit burst 10Mbit mtu 64kb drop flowid :1
```
the last command will get this error
```
RTNETLINK answers: No space left on device
We have an error talking to the kernel
```
upstream 4.15(eol) also have this issue, but 4.16.2 fixed, and ubuntu
4.15.0-36 already patched upstream 4.16.2 fix patch.
however this issue still exist, I think the difference between 4.15 and 4.16
caused this issue.
please kindly help check it.
Thanks.
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https://bugs.launchpad.net/bugs/1797669
Title:
tc filter add after delete get error "No space left on device"
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