linux-kernel - lockdep WARNING on check_critical

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Message-ID: <20120905015937.GA20175@localhost>
Date:	Wed, 5 Sep 2012 09:59:37 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>
Subject: lockdep WARNING on check_critical_timing()

Greetings,

This is possibly an aged warning.

        if (!hardirq_count()) {
                if (softirq_count()) {
                        /* like the above, but with softirqs */
=>                      DEBUG_LOCKS_WARN_ON(current->softirqs_enabled);

[    3.600059] Testing tracer preemptoff: 
[    3.760076] ------------[ cut here ]------------
[    3.760866] WARNING: at /c/kernel-tests/src/stable/kernel/lockdep.c:3506 check_flags+0x125/0x154()
[    3.762160] Modules linked in:
[    3.762643] Pid: 1, comm: swapper/0 Not tainted 3.6.0-rc3-00013-g01f8a27 #158
[    3.763679] Call Trace:
[    3.764053]  [<c1020916>] warn_slowpath_common+0x4d/0x62
[    3.764838]  [<c105c000>] ? check_flags+0x125/0x154
[    3.765567]  [<c102093f>] warn_slowpath_null+0x14/0x18
[    3.766317]  [<c105c000>] check_flags+0x125/0x154
[    3.766998]  [<c105e02f>] lock_acquire+0x3b/0xef
[    3.767689]  [<c12461ba>] _raw_spin_lock_irqsave+0x3e/0x4e
[    3.768494]  [<c12404b8>] ? check_critical_timing+0x112/0x160
[    3.769340]  [<c12404b8>] check_critical_timing+0x112/0x160
[    3.770047]  [<c1027474>] ? __do_softirq+0x19b/0x1f9
[    3.770047]  [<c1027474>] ? __do_softirq+0x19b/0x1f9
[    3.770047]  [<c1088549>] trace_preempt_on+0x8d/0xc9
[    3.770047]  [<c1027238>] ? __local_bh_enable+0x87/0x8a
[    3.770047]  [<c1046c85>] sub_preempt_count+0x7f/0x9c
[    3.770047]  [<c1027238>] __local_bh_enable+0x87/0x8a
[    3.770047]  [<c1027474>] __do_softirq+0x19b/0x1f9
[    3.770047]  [<c10272d9>] ? ftrace_define_fields_irq_handler_entry+0x45/0x45
[    3.770047]  <IRQ>  [<c1027723>] ? irq_exit+0x4f/0xa9
[    3.770047]  [<c1015e03>] ? smp_apic_timer_interrupt+0x70/0x7e
[    3.770047]  [<c1246daf>] ? apic_timer_interrupt+0x2f/0x34
[    3.770047]  [<c108007b>] ? ring_buffer_discard_commit+0x24c/0x24c
[    3.770047]  [<c1139c87>] ? __const_udelay+0x1/0x1c
[    3.770047]  [<c108566f>] ? trace_selftest_startup_preemptoff+0x74/0xed
[    3.770047]  [<c1085b57>] ? register_tracer+0x11c/0x1f7
[    3.770047]  [<c13c1bf3>] ? init_function_trace+0xf/0xf
[    3.770047]  [<c13c1c00>] ? init_irqsoff_tracer+0xd/0x11
[    3.770047]  [<c1001158>] ? do_one_initcall+0x70/0x118
[    3.770047]  [<c13afa03>] ? kernel_init+0xec/0x169
[    3.770047]  [<c13af917>] ? start_kernel+0x2f2/0x2f2
[    3.770047]  [<c124773a>] ? kernel_thread_helper+0x6/0x10

Thanks,
Fengguang

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