Date: Fri, 2 Jul 2010 13:07:08 GMT From: Boris Kochergin <spawk@acm.poly.edu> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/148317: FreeBSD 7.x hostap memory leak in net80211 or Atheros driver Message-ID: <201007021307.o62D78oE070775@www.freebsd.org> Resent-Message-ID: <201007021310.o62DA5bd058585@freefall.freebsd.org>
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>Number: 148317 >Category: kern >Synopsis: FreeBSD 7.x hostap memory leak in net80211 or Atheros driver >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Jul 02 13:10:05 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Boris Kochergin >Release: 7.3-RELEASE-p1 >Organization: Polytechnic Institute of NYU >Environment: FreeBSD varick-ap-2 7.3-RELEASE-p1 FreeBSD 7.3-RELEASE-p1 #3: Wed Jun 16 09:56:35 EDT 2010 boris@varick-ap-2:/usr/obj/usr/src/sys/VARICK-5501-AP i386 >Description: When using an Atheros 5212 PCI controller as a busy 7.x access point, a memory leak occurs frequently and eventually leads to a panic. The problem has been observed on multiple machines. Relevant "vmstat -m" output when the leak is observed: 80211node 12677 101401K - 120901 16,512 Running "ifconfig ath0 down" (ath0 being the controller in hostap mode) frees the memory. The problem occurs with all three rate-control algorithms. I have eliminated some possible allocations that might cause the leak and have narrowed it down to two: Line 595 of /usr/src/sys/net80211/ieee80211_node.c: MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node), M_80211_NODE, M_NOWAIT | M_ZERO); Line 3164 of /usr/src/sys/dev/ath/if_ath.c: an = malloc(space, M_80211_NODE, M_NOWAIT|M_ZERO); It looks like both are supposed to be freed by node_free() in /usr/src/sys/net80211/ieee80211_node.c, but there is some code path where that doesn't happen, and should. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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