linux-kernel - Re: [PATCH 0/2] [GIT PULL] tracing/ring-buffer: updates to tip

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Date:	Thu, 7 May 2009 19:50:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/2] [GIT PULL] tracing/ring-buffer: updates to tip


hm, i turned the self-test back on, and almost immediately got the 
lockdep assert below.

config attached.

	Ingo

[    1.779027] calling  init_irqsoff_tracer+0x0/0x14 @ 1
[    1.780020] Testing tracer irqsoff: 
[    1.780516] =============================================
[    1.781146] PASSED
[    1.781151] initcall init_irqsoff_tracer+0x0/0x14 returned 0 after 976 usecs
[    1.781155] calling  init_wakeup_tracer+0x0/0x22 @ 1
[    1.781160] Testing tracer wakeup: [ INFO: possible recursive locking detected ]
[    1.808746] 2.6.30-rc4-tip #39622
[    1.812064] ---------------------------------------------
[    1.817481] rb_consumer/942 is trying to acquire lock:
[    1.822608]  (&cpu_buffer->reader_lock){......}, at: [<ffffffff804cedd7>] ring_buffer_reset_cpu+0xe4/0x173
[    1.832342] 
[    1.832342] but task is already holding lock:
[    1.838177]  (&cpu_buffer->reader_lock){......}, at: [<ffffffff804d1144>] ring_buffer_consume+0xf9/0x189
[    1.847734] 
[    1.847734] other info that might help us debug this:
[    1.854275] 1 lock held by rb_consumer/942:
[    1.858460]  #0:  (&cpu_buffer->reader_lock){......}, at: [<ffffffff804d1144>] ring_buffer_consume+0xf9/0x189
[    1.868472] 
[    1.868472] stack backtrace:
[    1.872862] Pid: 942, comm: rb_consumer Not tainted 2.6.30-rc4-tip #39622
[    1.879646] Call Trace:
[    1.882093]  [<ffffffff804ab1b2>] print_deadlock_bug+0xe3/0xf2
[    1.887924]  [<ffffffff8043ae10>] ? sched_clock+0x33/0x39
[    1.893345]  [<ffffffff804ab2f7>] check_deadlock+0x136/0x163
[    1.899012]  [<ffffffff804ac97d>] validate_chain+0x614/0x620
[    1.904667]  [<ffffffff8043af56>] ? native_sched_clock+0x7d/0x98
[    1.910668]  [<ffffffff804ad139>] __lock_acquire+0x7b0/0x826
[    1.916337]  [<ffffffff804a9b45>] ? trace_hardirqs_off+0xd/0xf
[    1.922162]  [<ffffffff804d049e>] ? rb_move_tail+0x274/0x34b
[    1.927823]  [<ffffffff8043af56>] ? native_sched_clock+0x7d/0x98
[    1.933816]  [<ffffffff804ad2ab>] lock_acquire+0xfc/0x128
[    1.939203]  [<ffffffff804cedd7>] ? ring_buffer_reset_cpu+0xe4/0x173
[    1.945563]  [<ffffffff811541db>] _spin_lock_irqsave+0x59/0x91
[    1.951396]  [<ffffffff804cedd7>] ? ring_buffer_reset_cpu+0xe4/0x173
[    1.957760]  [<ffffffff804cedd7>] ring_buffer_reset_cpu+0xe4/0x173
[    1.963964]  [<ffffffff804d95ff>] tracing_reset+0x46/0x9a
[    1.969336]  [<ffffffff80434114>] ? restore_args+0x0/0x30
[    1.974757]  [<ffffffff804dda2e>] time_hardirqs_off+0x100/0x152
[    1.980673]  [<ffffffff804cfa17>] ? rb_get_reader_page+0x2c/0x272
[    1.986747]  [<ffffffff804a9b45>] ? trace_hardirqs_off+0xd/0xf
[    1.992579]  [<ffffffff804cfa17>] ? rb_get_reader_page+0x2c/0x272
[    1.998694]  [<ffffffff804a9aac>] trace_hardirqs_off_caller+0x1f/0xab
[    2.005112]  [<ffffffff804a9b45>] trace_hardirqs_off+0xd/0xf
[    2.010770]  [<ffffffff804cfa17>] rb_get_reader_page+0x2c/0x272
[    2.016691]  [<ffffffff804d00f8>] rb_buffer_peek+0x111/0x11c
[    2.022391]  [<ffffffff804d1157>] ring_buffer_consume+0x10c/0x189
[    2.028475]  [<ffffffff804d2fd6>] ring_buffer_consumer+0x43/0x1f0
[    2.034546]  [<ffffffff804d3183>] ? ring_buffer_consumer_thread+0x0/0x8d
[    2.041249]  [<ffffffff804d31a4>] ring_buffer_consumer_thread+0x21/0x8d
[    2.047859]  [<ffffffff8049a2a0>] kthread+0x5b/0x88
[    2.052747]  [<ffffffff804347ba>] child_rip+0xa/0x20
[    2.057704]  [<ffffffff804758d0>] ? finish_task_switch+0x40/0x152
[    2.063818]  [<ffffffff80434114>] ? restore_args+0x0/0x30
[    2.069206]  [<ffffffff8115045c>] ? schedule+0x19d/0x8fd
[    2.074533]  [<ffffffff8049a245>] ? kthread+0x0/0x88
[    2.079501]  [<ffffffff804347b0>] ? child_rip+0x0/0x20
[    2.409100] PASSED
[    2.410017] Testing tracer wakeup_rt: PASSED
[    2.613891] initcall init_wakeup_tracer+0x0/0x22 returned 0 after 812500 usecs

View attachment "config" of type "text/plain" (65261 bytes)