linux-kernel - suspend-related lockdep warning

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Message-Id: <20071128024355.5931c6ec.akpm@linux-foundation.org>
Date:	Wed, 28 Nov 2007 02:43:55 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: suspend-related lockdep warning


2.6.24-rc3-mm2 (which will be released if it boots on two more machines and
if I stay awake) will say this during suspend-to-RAM on the Vaio:

[   91.876445] Syncing filesystems ... done.
[   92.382595] Freezing user space processes ... WARNING: at kernel/lockdep.c:2662 check_flags()
[   92.384000] Pid: 1925, comm: dbus-daemon Not tainted 2.6.24-rc3-mm2 #32
[   92.384177]  [<c0104a74>] show_trace_log_lvl+0x12/0x25
[   92.384335]  [<c01052ff>] show_trace+0xd/0x10
[   92.384469]  [<c01059be>] dump_stack+0x55/0x5d
[   92.384605]  [<c0136a29>] check_flags+0x7f/0x11a
[   92.384746]  [<c0139cfb>] lock_acquire+0x3a/0x86
[   92.384886]  [<c031f4de>] _spin_lock+0x26/0x53
[   92.385023]  [<c0141d3b>] refrigerator+0x13/0xc8
[   92.385163]  [<c01274c8>] get_signal_to_deliver+0x32/0x3fb
[   92.385326]  [<c01030f4>] do_notify_resume+0x8c/0x699
[   92.385476]  [<c0103c18>] work_notifysig+0x13/0x1b
[   92.385620]  =======================
[   92.385719] irq event stamp: 309
[   92.385809] hardirqs last  enabled at (309): [<c0103c79>] syscall_exit_work+0x11/0x26
[   92.386045] hardirqs last disabled at (308): [<c0103b42>] syscall_exit+0x14/0x25
[   92.386265] softirqs last  enabled at (0): [<c011bea5>] copy_process+0x374/0x130e
[   92.386491] softirqs last disabled at (0): [<00000000>] 0x0
[   92.392457] (elapsed 0.00 seconds) done.
[   92.392581] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
[   92.392882] PM: Entering mem sleep
[   92.392974] Suspending console(s)

this has been happening for quite some time and might even be happening in
mainline.  

Also, a few seconds after resume has completed we get a whimper from the
hangcheck driver:

[    1.762425] usb 2-1: configuration #1 chosen from 1 choice
[    1.826548] input: Microsoft Microsoft Wireless Optical Mouse_ 1.00 as /class/input/input9
[    1.866211] input: USB HID v1.11 Mouse [Microsoft Microsoft Wireless Optical Mouse_ 1.00] on usb-0000:00:1d.1-1
[    5.757927] Hangcheck: hangcheck value past margin!

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