linux-kernel - odd lockdep messages

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Date:	Mon, 08 Mar 2010 13:30:53 -0500
From:	Valdis.Kletnieks@...edu
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: odd lockdep messages

(Not sure when this started, just noticed it... Wasn't present in
2.6.33-rc7-mmotm0210, is in 2.6.33-mmotm0302 and -mmotm0304).

Seen in dmesg:

 dmesg | grep -C 5 'BUG: key'
[    0.978944] Monitor-Mwait will be used to enter C-1 state
[    0.979944] Monitor-Mwait will be used to enter C-2 state
[    0.980943] Monitor-Mwait will be used to enter C-3 state
[    0.981056] Marking TSC unstable due to TSC halts in idle
[    0.981298] Switching to clocksource hpet
[    1.012163] BUG: key ffff88011efbf500 not in .data!
[    1.012284] BUG: key ffff88011efbf548 not in .data!
[    1.015935] thermal LNXTHERM:01: registered as thermal_zone0
[    1.016070] ACPI: Thermal Zone [THM] (39 C)
[    1.022610] Real Time Clock Driver v1.12b
[    1.022955] Linux agpgart interface v0.103
[    1.023342] Hangcheck: starting hangcheck timer 0.9.0 (tick is 180 seconds, margin is 60 seconds).
--
[    1.876870] iwlagn 0000:0c:00.0: setting latency timer to 64
[    1.876914] iwlagn 0000:0c:00.0: Detected Intel Wireless WiFi Link 5100AGN REV=0x54
[    1.899041] iwlagn 0000:0c:00.0: Tunable channels: 13 802.11bg, 24 802.11a channels
[    1.899170] iwlagn 0000:0c:00.0: irq 31 for MSI/MSI-X
[    1.899467] iwlagn 0000:0c:00.0: firmware: requesting iwlwifi-5000-2.ucode
[    1.899537] BUG: key ffff88011c57e670 not in .data!
[    1.899629] console [netcon0] enabled
[    1.899644] netconsole: network logging started
[    1.899699] ohci1394 0000:03:01.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
[    2.053034] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    2.052015] ohci1394: fw-host0: Set PHY Reg timeout [0xffffffff/0x00004000/100]
--
[   10.518458] usb 5-1: Manufacturer: Broadcom Corp
[   10.518460] usb 5-1: SerialNumber: 0123456789ABCD
[   10.520315] usb 5-1: config 0 descriptor??
[   10.586699] iwlagn 0000:0c:00.0: request for firmware file 'iwlwifi-5000-2.ucode' failed.
[   10.586873] iwlagn 0000:0c:00.0: firmware: requesting iwlwifi-5000-1.ucode
[   10.586962] BUG: key ffff88011c57e670 not in .data!
[   10.594431] iwlagn 0000:0c:00.0: request for firmware file 'iwlwifi-5000-1.ucode' failed.
[   10.594436] iwlagn 0000:0c:00.0: no suitable firmware found!
[   10.594658] iwlagn 0000:0c:00.0: PCI INT A disabled
[   10.611235] usb 1-4.1: new low speed USB device using ehci_hcd and address 5
[   10.713441] usb 1-4.1: New USB device found, idVendor=045e, idProduct=0023

(-0302 threw BUG: 3 times, the first 2 and the last. In -0304, the third
one appears as well).

Worth instrumenting and chasing down? If so, what should a crash test dummy
be doing here? ;)


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