linux-kernel - Re: [2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot

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Date:	Thu, 20 Mar 2008 00:50:34 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Dave Hansen <haveblue@...ibm.com>,
	Eric Piel <eric.piel@...mplin-utc.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Renninger <trenn@...e.de>,
	Len Brown <len.brown@...el.com>,
	Linus Torvalds <torvalds@...l.org>,
	Christoph Hellwig <hch@...radead.org>,
	Markus Gaugusch <dsdt@...gusch.at>, linux-acpi@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot

Am 17.03.2008 13:23 schrieb Peter Zijlstra:
> On Sun, 2008-03-16 at 13:11 -0700, Dave Hansen wrote:
> 
>>>  ACPI: Core revision 20070126
>>> +INFO: trying to register non-static key.
>>> +the code is fine but needs lockdep annotation.
>>> +turning off the locking correctness validator.
>>> +Pid: 0, comm: swapper Not tainted 2.6.25-rc5-mm1-testing #3
>>> + [<c014321e>] __lock_acquire+0x144/0xb6e
>>> + [<c010b1a2>] ? native_sched_clock+0xe0/0xff
>>> + [<c017fc57>] ? kmem_cache_alloc+0x89/0xc9
>>> + [<c0142ce0>] ? trace_hardirqs_on+0xe8/0x11d
>>> + [<c014404f>] lock_acquire+0x6a/0x90
>>> + [<c013b460>] ? down_trylock+0xc/0x27
>>> + [<c03016cb>] _spin_lock_irqsave+0x42/0x72
>>> + [<c013b460>] ? down_trylock+0xc/0x27
>>> + [<c013b460>] down_trylock+0xc/0x27
>>> + [<c021fa65>] acpi_os_wait_semaphore+0x67/0x13d
>>> + [<c023a39e>] acpi_ut_acquire_mutex+0x65/0xcf
>>> + [<c0230261>] acpi_ns_root_initialize+0x1a/0x289
>>> + [<c043ad54>] acpi_initialize_subsystem+0x47/0x6a
>>> + [<c043afd4>] acpi_early_init+0x57/0xf8
>>> + [<c04248ff>] start_kernel+0x34d/0x35a
>>> + [<c0424019>] i386_start_kernel+0x8/0xa
>>> + =======================
>>>  ACPI: Checking initramfs for custom DSDT
[...]
> Looks like another of the semaphore thingies.. Does this go away once
> you apply the semaphore lockdep fixup from here:
> 
>   http://lkml.org/lkml/2008/3/12/63

Yes, it does. With that patch on top of Dave's, I see no stack
backtraces in dmesg anymore.

HTH
T.

-- 
Tilman Schmidt                          E-Mail: tilman@...p.cc
Bonn, Germany
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