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Date: Sun, 16 Jan 2011 02:59:14 +0100 From: Helmut Schaa <helmut.schaa@...glemail.com> To: Ivo Van Doorn <ivdoorn@...il.com> Cc: Ingo Brunberg <ingo_brunberg@....de>, linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org Subject: Re: BUG in rt2x00lib_txdone() with 2.6.37-rc8 Am Samstag, 15. Januar 2011 schrieb Ivo Van Doorn: > Hi, > > > Just a shot in the dark but since the stack trace shows the newly added > > watchdog this might be the result of a race between a regular txdone work > > (mac80211 workqueue) vs the watchdog work (global workqueue). > > > > I guess the following situation could happen: > > A regular tx done work calls rt2x00lib_txdone which first sets entry->skb to > > NULL, calls the driver specific clear_entry and afterwards increases > > Q_INDEX_DONE. If the watchdog work calls rt2x00lib_txdone on a different CPU > > inbetween the skb might be NULL and cause the above oops. > > This could be, would be interesting to know if compat-wireless also shows > this problem. Because the queue refactoring code which should have solved > these race conditions was added after 2.6.37. I also guess that this issue would be fixed in compat-wireless due to the queue refactoring. But I guess that is way too big for a stable kernel :( Helmut -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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