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Date: Tue, 19 Aug 2008 11:51:32 +1000 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: Steven Rostedt <srostedt@...hat.com> Cc: Eran Liberty <liberty@...ricom.com>, linuxppc-dev@...abs.org, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>, linux-kernel@...r.kernel.org, rostedt@...dmis.org Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3) On Mon, 2008-08-18 at 11:07 -0400, Steven Rostedt wrote: > Eran Liberty wrote: > > After compiling a kernel with ftrace I started to experience all sorts > > of crashes. > > Just to make sure... > > ftrace enables markers too, and RCU has tracing with the markers. This > may not be the problem, but I just want to eliminate as many variables > as possible. > Could you disable ftrace, but keep the markers on too. Also, could you > enable ftrace again and turn on the FTRACE_STARTUP_TEST. I spent some time last week tracking one of those crashes and it appears that we are getting corruption of some of the non-volatile registers. So far, I found out that it -seems- to be coming from stack frame corruption during a timer interrupt. I haven't had a chance to dig further yet. Cheers, Ben. -- 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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