130 lines
5.8 KiB
Diff
130 lines
5.8 KiB
Diff
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Delivered-To: jwboyer@gmail.com
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id 1UYKmx-0005xg-JP; Fri, 03 May 2013 20:32:59 +0200
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Date: Fri, 3 May 2013 20:32:58 +0200 (CEST)
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From: Thomas Gleixner <tglx@linutronix.de>
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To: Dave Jones <davej@redhat.com>
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cc: Yinghai Lu <yinghai@kernel.org>,
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Linux Kernel <linux-kernel@vger.kernel.org>
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Subject: Re: clockevents_program_event WARN_ON preventing boot.
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In-Reply-To: <20130503144912.GB1283@redhat.com>
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Message-ID: <alpine.LFD.2.02.1305032015060.2990@ionos>
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References: <20130430212007.GB18598@redhat.com> <20130430213719.GA14988@redhat.com> <alpine.LFD.2.02.1305021234510.3972@ionos> <20130502154621.GA23990@redhat.com> <alpine.LFD.2.02.1305022152280.2891@ionos> <CAE9FiQXpV451xTzAJyNdC-+-oqF9v8Cy5evcNOHKFffERw2SwA@mail.gmail.com>
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<alpine.LFD.2.02.1305022304370.2891@ionos> <CAE9FiQWFK_ropzW_qQLcNxLYyek8-PHGW-8SxfZJSijvdrss1A@mail.gmail.com> <alpine.LFD.2.02.1305022337470.2891@ionos> <20130503144912.GB1283@redhat.com>
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On Fri, 3 May 2013, Dave Jones wrote:
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> On Fri, May 03, 2013 at 12:49:20AM +0200, Thomas Gleixner wrote:
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>
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> > I'm fundamentally confused and Daves observation about slub debug does
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> > not make it less confusing.
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> >
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> > It'd be nice if you could add some more instrumentation or bisect the
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> > issue.
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>
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> Here's what I ended up with..
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> b352bc1cbc29134a356b5c16ee2281807a7b984e is the first bad commit
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> commit b352bc1cbc29134a356b5c16ee2281807a7b984e
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> Author: Thomas Gleixner <tglx@linutronix.de>
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> Date: Tue Mar 5 14:25:32 2013 +0100
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>
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> tick: Convert broadcast cpu bitmaps to cpumask_var_t
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>
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> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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> Link: http://lkml.kernel.org/r/20130306111537.366394000@linutronix.de
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> Cc: Rusty Russell <rusty@rustcorp.com.au>
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>
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I bet you have CONFIG_CPUMASK_OFFSTACK enabled.
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/me is a moron and rumages for a brown paperbag.
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Patch below.
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Thanks,
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tglx
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------------>
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Subject: tick: Use zalloc_cpumask_var for allocating offstack cpumasks
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Fri, 03 May 2013 20:22:36 +0200
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commit b352bc1cbc (tick: Convert broadcast cpu bitmaps to
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cpumask_var_t) broke CONFIG_CPUMASK_OFFSTACK in a very subtle way.
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Instead of allocating the cpumasks with zalloc_cpumask_var it uses
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alloc_cpumask_var, so we can get random data there, which of course
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confuses the logic completely and causes random failures.
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Reported-by: Dave Jones <davej@redhat.com>
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Reported-by: Yinghai Lu <yinghai@kernel.org>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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kernel/time/tick-broadcast.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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Index: linux-2.6/kernel/time/tick-broadcast.c
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===================================================================
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--- linux-2.6.orig/kernel/time/tick-broadcast.c
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+++ linux-2.6/kernel/time/tick-broadcast.c
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@@ -785,11 +785,11 @@ bool tick_broadcast_oneshot_available(vo
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void __init tick_broadcast_init(void)
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{
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- alloc_cpumask_var(&tick_broadcast_mask, GFP_NOWAIT);
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- alloc_cpumask_var(&tmpmask, GFP_NOWAIT);
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+ zalloc_cpumask_var(&tick_broadcast_mask, GFP_NOWAIT);
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+ zalloc_cpumask_var(&tmpmask, GFP_NOWAIT);
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#ifdef CONFIG_TICK_ONESHOT
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- alloc_cpumask_var(&tick_broadcast_oneshot_mask, GFP_NOWAIT);
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- alloc_cpumask_var(&tick_broadcast_pending_mask, GFP_NOWAIT);
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- alloc_cpumask_var(&tick_broadcast_force_mask, GFP_NOWAIT);
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+ zalloc_cpumask_var(&tick_broadcast_oneshot_mask, GFP_NOWAIT);
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+ zalloc_cpumask_var(&tick_broadcast_pending_mask, GFP_NOWAIT);
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+ zalloc_cpumask_var(&tick_broadcast_force_mask, GFP_NOWAIT);
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#endif
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}
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--
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