It looks like this got into Karmic a while ago in 2.6.31-17.54 [1].
[1]
http://changelogs.ubuntu.com/changelogs/pool/main/l/linux/linux_2.6.31-17.54/changelog
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Released
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WARNING: at /build/buildd/linux-2.6.31/net/mac80211/iface.c:651
ieee80211_teardown_sdata+0xda/0x1a0 [mac80211]()
https://bugs.launchpad.net/bugs/457523
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