Date: Fri, 20 Dec 2019 21:13:27 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 242746] Deleting (or re-setting) an IP address with ifconfig holds (leaks?) memory Message-ID: <bug-242746-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D242746 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: bugs@FreeBSD.org Reporter: ghuckriede@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 scr= ipt 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 84= 5 of https://svnweb.freebsd.org/base/head/sys/net/if.c?revision=3D355070&view=3D= 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 #=20 # 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=20 sleep 1=20 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 16,32,64,128,256,512,2048,4= 096 ifaddr 1834876 917407K - 1835089 16,32,64,128,256,512,2048,4= 096 ifaddr 1834877 917407K - 1835090 16,32,64,128,256,512,2048,4= 096 ifaddr 1834878 917408K - 1835091 16,32,64,128,256,512,2048,4= 096 ifaddr 1834879 917408K - 1835092 16,32,64,128,256,512,2048,4= 096 ^C # Expected Results: Not to leak/hold onto memory. Build Date & Hardware: HEADr355854 on amd64 target with any networking interface --=20 You are receiving this mail because: You are the assignee for the bug.=
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