Date: Thu, 21 Apr 2011 22:40:42 +0530
From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
        Linux-mm <linux-mm@kvack.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Christoph Hellwig <hch@infradead.org>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Oleg Nesterov <oleg@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
        SystemTap <systemtap@sources.redhat.com>,
        Jim Keniston <jkenisto@linux.vnet.ibm.com>,
        Roland McGrath <roland@hack.frob.com>,
        Andi Kleen <andi@firstfloor.org>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v3 2.6.39-rc1-tip 15/26] 15: uprobes: Handing int3 and
 singlestep exception.
Message-ID: <20110421171042.GI10698@linux.vnet.ibm.com>
Reply-To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
References: <20110401143223.15455.19844.sendpatchset@localhost6.localdomain6>
 <20110401143527.15455.32854.sendpatchset@localhost6.localdomain6>
 <1303218185.8345.0.camel@twins>
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* Peter Zijlstra <peterz@infradead.org> [2011-04-19 15:03:05]:

> On Fri, 2011-04-01 at 20:05 +0530, Srikar Dronamraju wrote:
> > +       if (unlikely(!utask)) {
> > +               utask = add_utask();
> > +
> > +               /* Failed to allocate utask for the current task. */
> > +               BUG_ON(!utask);
> 
> That's not really nice is it ;-) means I can make the kernel go BUG by
> simply applying memory pressure.
> 

The other option would be remove the probe and set the ip to
the breakpoint address and restart the thread.


-- 
Thanks and Regards
Srikar
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