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

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Date:	Sat, 15 Mar 2008 13:47:52 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Dave Hansen <haveblue@...ibm.com>
CC:	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>,
	Arjan van de Ven <arjanv@...hat.com>
Subject: Re: [2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot

Am 15.03.2008 00:29 schrieb Dave Hansen:
> Anyway, I'm sick of too much bitching and too little coding.  Andrew,
> here's a patch for -mm that will at least shut up the spinlock warnings.

Sorry to say, it doesn't. That is, it does shut up the warning I
reported, but there's a new one appearing now instead, three lines
later. Here's the dmesg diff:

@@ -216,29 +216,30 @@
 CPU0: Thermal monitoring enabled
 Compat vDSO mapped to ffffe000.
 Checking 'hlt' instruction... OK.
-BUG: spinlock bad magic on CPU#0, swapper/0
- lock: c2c19380, .magic: 00000000, .owner: swapper/0, .owner_cpu: 0
-Pid: 0, comm: swapper Not tainted 2.6.25-rc5-mm1-testing #2
- [<c01f728c>] spin_bug+0x7c/0x87
- [<c01f72b0>] _raw_spin_unlock+0x19/0x71
- [<c0301922>] _spin_unlock+0x1d/0x3c
- [<c01981aa>] mnt_want_write+0x62/0x88
- [<c018c382>] sys_mkdirat+0x86/0xd6
- [<c04260ab>] ? clean_path+0x16/0x4a
- [<c017fd6f>] ? kfree+0xd8/0xec
- [<c018c3e2>] sys_mkdir+0x10/0x12
- [<c0426353>] do_name+0x112/0x1b3
- [<c042558b>] write_buffer+0x1d/0x2c
- [<c04255fe>] flush_window+0x64/0xb3
- [<c04272f5>] unpack_to_rootfs+0x62c/0x8b9
- [<c04275a2>] populate_rootfs+0x20/0x109
- [<c0429ed2>] ? alternative_instructions+0x153/0x158
- [<c04248f5>] start_kernel+0x343/0x355
- [<c0424019>] i386_start_kernel+0x8/0xa
- =======================
 Unpacking initramfs... done
-Freeing initrd memory: 8767k freed
+Freeing initrd memory: 8834k freed
 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
 Parsing all Control Methods:
 Table [DSDT](id 0001) - 637 Objects with 63 Devices 160 Methods 41 Regions

HTH
T.

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