Bug 91941

Summary:	device refcounting broken when moving a route across devices
Product:	Networking	Reporter:	Lubomir Rintel (lkundrak)
Component:	IPV6	Assignee:	Hideaki YOSHIFUJI (yoshfuji)
Status:	NEW ---
Severity:	normal	CC:	hannes
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.10 -- 3.18	Subsystem:
Regression:	No	Bisected commit-id:

Description Lubomir Rintel 2015-01-23 19:46:32 UTC

[root@rhel7-5 lkundrak]# sh -x lal
+ ip link add dev0 type dummy
+ ip link set dev0 up
+ ip link add dev1 type dummy
+ ip link set dev1 up
+ ip addr add 2001:db8:8086::2/64 dev dev0
+ ip route add 2001:db8:8086::/48 dev dev0 proto static metric 20
+ ip route add 2001:db8:8088::/48 dev dev1 proto static metric 10
+ ip route replace 2001:db8:8086::/48 dev dev1 proto static metric 20
+ ip link del dev0 type dummy
Message from syslogd@rhel7-5 at Jan 23 10:54:41 ...
 kernel:unregister_netdevice: waiting for dev0 to become free. Usage count = 2
 
Message from syslogd@rhel7-5 at Jan 23 10:54:51 ...
 kernel:unregister_netdevice: waiting for dev0 to become free. Usage count = 2

Comment 1 hannes 2015-01-26 14:11:51 UTC

Addressed in patch:

http://patchwork.ozlabs.org/patch/432749/