linux-kernel - rebalance_domains() triggered a lockdep warning

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Date:	Fri, 17 Aug 2012 17:23:07 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: rebalance_domains() triggered a lockdep warning

Greetings,

rebalance_domains() triggered this warning in lockdep.c:

                if (DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)) {
                        printk("possible reason: unannotated irqs-on.\n");
                }

[    2.736251] Testing tracer branch: [    2.740329] tsc: Refined TSC clocksource calibration: 2833.318 MHz
[    2.784799] ------------[ cut here ]------------
[    2.785509] WARNING: at /c/kernel-tests/src/tip/kernel/lockdep.c:3493 check_flags+0xc0/0x1d0()
[    2.786661] Hardware name: Bochs

[    2.787155] Modules linked in:
[    2.787860] Pid: 0, comm: swapper/0 Not tainted 3.6.0-rc1-00010-g25cd20b #68
[    2.788736] Call Trace:
[    2.788736]  <IRQ>  [<ffffffff8105bb1e>] warn_slowpath_common+0xae/0xf0
[    2.788736]  [<ffffffff8105bb7a>] warn_slowpath_null+0x1a/0x20
[    2.788736]  [<ffffffff810e62f0>] check_flags+0xc0/0x1d0
[    2.788736]  [<ffffffff810ea162>] lock_acquire+0x72/0x230
[    2.788736]  [<ffffffff811319af>] ? rb_reserve_next_event+0x5f/0x370
[    2.788736]  [<ffffffff810c68cb>] rebalance_domains+0x7b/0x480
[    2.788736]  [<ffffffff810c6850>] ? load_balance+0xdb0/0xdb0
[    2.788736]  [<ffffffff81140845>] ? ftrace_likely_update+0xe5/0x260
[    2.788736]  [<ffffffff810c6d28>] run_rebalance_domains+0x58/0x220
[    2.788736]  [<ffffffff8106a697>] __do_softirq+0x127/0x6c0
[    2.788736]  [<ffffffff8144af7c>] call_softirq+0x1c/0x30
[    2.788736]  [<ffffffff81006145>] do_softirq+0x175/0x280
[    2.788736]  [<ffffffff8106b0b7>] irq_exit+0xc7/0x130
[    2.788736]  [<ffffffff810ba9fd>] scheduler_ipi+0xfd/0x150
[    2.788736]  [<ffffffff8103610a>] smp_reschedule_interrupt+0x2a/0x30
[    2.788736]  [<ffffffff8144aaef>] reschedule_interrupt+0x6f/0x80
[    2.788736]  <EOI>  [<ffffffff81040026>] ? native_safe_halt+0x6/0x10
[    2.788736]  [<ffffffff8101262d>] default_idle+0x56d/0x580
[    2.788736]  [<ffffffff81013886>] cpu_idle+0x156/0x160
[    2.788736]  [<ffffffff81416b2c>] rest_init+0x160/0x174
[    2.788736]  [<ffffffff814169cc>] ? csum_partial_copy_generic+0x16c/0x16c
[    2.788736]  [<ffffffff81e2f24a>] start_kernel+0x61c/0x629
[    2.788736]  [<ffffffff81e2e8f5>] ? repair_env_string+0x9f/0x9f
[    2.788736]  [<ffffffff81e2e369>] x86_64_start_reservations+0x165/0x169
[    2.788736]  [<ffffffff81e2e5ee>] x86_64_start_kernel+0x281/0x290

Thanks,
Fengguang

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