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Message-ID: <20070228004641.GC12600@redhat.com>
Date: Tue, 27 Feb 2007 19:46:41 -0500
From: Dave Jones <davej@...hat.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Fwd: oprofile lockdep warning on rc1
This happened on a 2.6.21rc1 kernel.
Dave
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http://www.codemonkey.org.uk
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From: Richard Hughes <hughsient@...il.com>
To: Development discussions related to Fedora Core <fedora-devel-list@...hat.com>
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Date: Tue, 27 Feb 2007 21:59:07 +0000
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On Tue, 2007-02-27 at 14:52 -0500, Adam Jackson wrote:
>
>
> Well it's at least partly Xorg's fault, but it would be helpful to
> know
> what the slow path is there; so if you do file a bug against Xorg,
> please accompany it with oprofile goodness.
Well, I get this:
CPU: Core Solo / Duo, speed 1662.57 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Unhalted clock cycles) with a unit mask
of 0x00 (Unhalted core cycles) count 860000
CPU_CLK_UNHALT...|
samples| %|
------------------
12704 82.6330 /usr/bin/Xorg
CPU_CLK_UNHALT...|
samples| %|
------------------
12066 94.9780 /usr/lib/xorg/modules/libfb.so
286 2.2513 /usr/bin/Xorg
216 1.7003 /usr/lib/xorg/modules/drivers/nv_drv.so
75 0.5904 /lib/libc-2.5.90.so
48 0.3778 /usr/lib/xorg/modules/libxaa.so
6 0.0472 /usr/lib/xorg/modules/extensions/libextmod.so
3 0.0236 /lib/librt-2.5.90.so
1 0.0079 /usr/lib/libXfont.so.1.4.1
1 0.0079 /usr/lib/xorg/modules/input/mouse_drv.so
1 0.0079 /usr/lib/xorg/modules/input/synaptics_drv.so
1 0.0079 /usr/lib/xorg/modules/libramdac.so
But also I get this (!!!):
oprofile: using NMI interrupt.
=================================
[ INFO: inconsistent lock state ]
2.6.20-1.2949.fc7 #1
---------------------------------
inconsistent {hardirq-on-W} -> {in-hardirq-W} usage.
swapper/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
(oprofilefs_lock){+-..}, at: [<f8c6db5e>] nmi_cpu_setup+0x15/0x4f
[oprofile]
{hardirq-on-W} state was registered at:
[<c0442440>] __lock_acquire+0x448/0xba4
[<c0442f8e>] lock_acquire+0x56/0x6f
[<c0614949>] _spin_lock+0x2b/0x38
[<f8c6d33c>] oprofilefs_ulong_from_user+0x4e/0x74 [oprofile]
[<f8c6d38c>] ulong_write_file+0x2a/0x38 [oprofile]
[<c047e20b>] vfs_write+0xaf/0x163
[<c047e859>] sys_write+0x3d/0x61
[<c0405134>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
irq event stamp: 23424902
hardirqs last enabled at (23424901): [<c0614d4d>]
_spin_unlock_irqrestore+0x36/0x3c
hardirqs last disabled at (23424902): [<c0405bb5>]
call_function_interrupt+0x29/0x38
softirqs last enabled at (23424892): [<c042c0d8>] __do_softirq
+0xdc/0xe2
softirqs last disabled at (23424885): [<c04074dc>] do_softirq+0x61/0xd0
other info that might help us debug this:
no locks held by swapper/0.
stack backtrace:
[<c04062a5>] show_trace_log_lvl+0x1a/0x2f
[<c0406869>] show_trace+0x12/0x14
[<c04068ed>] dump_stack+0x16/0x18
[<c0440f67>] print_usage_bug+0x141/0x14b
[<c0441620>] mark_lock+0xa2/0x419
[<c04423b1>] __lock_acquire+0x3b9/0xba4
[<c0442f8e>] lock_acquire+0x56/0x6f
[<c0614949>] _spin_lock+0x2b/0x38
[<f8c6db5e>] nmi_cpu_setup+0x15/0x4f [oprofile]
[<c0417e6a>] smp_call_function_interrupt+0x3f/0x5b
[<c0405bbf>] call_function_interrupt+0x33/0x38
[<c0614896>] _spin_unlock+0x16/0x20
[<c043ded6>] clockevents_notify+0x3e/0x42
[<c0532f67>] acpi_state_timer_broadcast+0x2e/0x31
[<c05338e8>] acpi_processor_idle+0x285/0x419
[<c040348e>] cpu_idle+0xb7/0xdd
[<c0418eef>] start_secondary+0x330/0x338
[<00000000>] 0x0
=======================
Why do the simplest bugs always turn into the most complicated ones ;-)
Richard.
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