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Date: Fri, 27 Jul 2012 12:20:38 -0400 From: Dave Jones <davej@...hat.com> To: Linux Kernel <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: lockdep trace from posix timers On Tue, Jul 24, 2012 at 04:36:13PM -0400, Dave Jones wrote: > Linus tree as of 5fecc9d8f59e765c2a48379dd7c6f5cf88c7d75a > > Dave > > ====================================================== > [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ] > 3.5.0+ #122 Not tainted > ------------------------------------------------------ > trinity-child2/5327 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: > blocked: (tasklist_lock){.+.+..}, instance: ffffffff81c05098, at: [<ffffffff8109762b>] posix_cpu_timer_del+0x2b/0xe0 > > and this task is already holding: > blocked: (&(&new_timer->it_lock)->rlock){-.-...}, instance: ffff880143bce170, at: [<ffffffff81093d49>] __lock_timer+0x89/0x1f0 > which would create a new lock dependency: > (&(&new_timer->it_lock)->rlock){-.-...} -> (tasklist_lock){.+.+..} > > but this new dependency connects a HARDIRQ-irq-safe lock: > (&(&new_timer->it_lock)->rlock){-.-...} > ... which became HARDIRQ-irq-safe at: Shall I start bisecting this ? I can trigger it very easily, but if you can give me a set of commits to narrow down, it'll speed up the bisection. Dave -- 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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