https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242746
Bug ID: 242746
Summary: Deleting (or re-setting) an IP address with ifconfig
holds (leaks?) memory
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: ghuckri...@blackberry.com
Overview:
Setting an IP address consumes 'ifaddr' typed memory. When destroying the IP
address the memory is not freed.
This memory does not appear to be collected later, as running the below script
shows no recovery after continuously re-setting the ip address for 16 hours.
The leaked memory was tracked down to the ifa_alloc() function, see line 845 of
https://svnweb.freebsd.org/base/head/sys/net/if.c?revision=355070&view=markup
Instrumenting the code revealed that there are more ifa_ref() calls than
ifa_free() calls. This results in the memory being held, as the system
believes there is still a reference to this memory.
Steps to Reproduce:
'ifconfig <interface> inet' an address and then 'ifconfig <interface> inet
delete' it.
Actual Results:
# vmstat -m | grep ifaddr
ifaddr 141 36K - 235 16,32,64,128,256,512,2048,4096
#
# ifconfig em1 inet 192.168.200.44
# vmstat -m | grep ifaddr
ifaddr 142 36K - 236 16,32,64,128,256,512,2048,4096
# ifconfig em1 inet delete 192.168.200.44
# vmstat -m | grep ifaddr
ifaddr 142 36K - 236 16,32,64,128,256,512,2048,4096
# cat /tmp/loop
while true
do
ifconfig em1 192.168.200.33
sleep 1
vmstat -m | grep ifaddr
done
# /tmp/loop
ifaddr 135 37K - 294 16,32,64,128,256,512,2048,4096
ifaddr 136 38K - 295 16,32,64,128,256,512,2048,4096
ifaddr 137 38K - 296 16,32,64,128,256,512,2048,4096
ifaddr 138 39K - 297 16,32,64,128,256,512,2048,4096
....snip (16 hours worth of logs)...
ifaddr 1834875 917406K - 1835088 16,32,64,128,256,512,2048,4096
ifaddr 1834876 917407K - 1835089 16,32,64,128,256,512,2048,4096
ifaddr 1834877 917407K - 1835090 16,32,64,128,256,512,2048,4096
ifaddr 1834878 917408K - 1835091 16,32,64,128,256,512,2048,4096
ifaddr 1834879 917408K - 1835092 16,32,64,128,256,512,2048,4096
^C
#
Expected Results:
Not to leak/hold onto memory.
Build Date & Hardware:
HEADr355854 on amd64 target with any networking interface
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