linux-kernel - Re: [PATCH][GIT PULL] ring-buffer: only warn on wrap if buffer is bigger than two pages

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Message-ID: <20090421143509.GA5243@elte.hu>
Date:	Tue, 21 Apr 2009 16:35:09 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH][GIT PULL] ring-buffer: only warn on wrap if buffer is
	bigger than two pages


here's a new one:

 Testing event sched_kthread_stop: <4>------------[ cut here ]------------
 WARNING: at kernel/fork.c:988 copy_process+0x147/0xf7d()
 Modules linked in:

config attached, bootlog below. This warning has the signs of some 
sort of lockdep interaction. (this too is a new one - it never 
triggered before)

	Ingo

device: 'network_throughput': device_add
PM: Adding info for No Bus:network_throughput
initcall pm_qos_power_init+0x0/0xca returned 0 after 22529 usecs
calling  software_resume+0x0/0x1b9 @ 1
initcall software_resume+0x0/0x1b9 returned -2 after 46 usecs
initcall software_resume+0x0/0x1b9 returned with error code -2 
calling  debugfs_kprobe_init+0x0/0x89 @ 1
initcall debugfs_kprobe_init+0x0/0x89 returned 0 after 34 usecs
calling  taskstats_init+0x0/0x95 @ 1
registered taskstats version 1
initcall taskstats_init+0x0/0x95 returned 0 after 2760 usecs
calling  clear_boot_tracer+0x0/0x2d @ 1
initcall clear_boot_tracer+0x0/0x2d returned 0 after 1 usecs
calling  event_trace_self_tests_init+0x0/0x38 @ 1
Running tests on trace events:
Testing event kfree_skb: OK
Testing event kmalloc: OK
Testing event kmem_cache_alloc: OK
Testing event kmalloc_node: OK
Testing event kmem_cache_alloc_node: OK
Testing event kfree: OK
Testing event kmem_cache_free: OK
Testing event irq_handler_exit: OK
Testing event irq_handler_entry: OK
Testing event softirq_entry: OK
Testing event softirq_exit: OK
Testing event lock_acquired: OK
Testing event lock_acquire: OK
Testing event lock_release: OK
Testing event lock_contended: OK
Testing event sched_kthread_stop: OK
Testing event sched_kthread_stop_ret: OK
Testing event sched_wait_task: OK
Testing event sched_wakeup: OK
Testing event sched_wakeup_new: OK
Testing event sched_switch: OK
Testing event sched_migrate_task: OK
Testing event sched_process_free: OK
Testing event sched_process_exit: OK
Testing event sched_process_wait: OK
Testing event sched_process_fork: OK
Testing event sched_signal_send: OK
Running tests on trace event systems:
Testing event system skb: OK
Testing event system kmem: OK
Testing event system irq: OK
Testing event system lockdep: OK
Testing event system sched: OK
Running tests on all trace events:
Testing all events: OK
Running tests again, along with the function tracer
Running tests on trace events:
Testing event kfree_skb: OK
Testing event kmalloc: OK
Testing event kmem_cache_alloc: OK
Testing event kmalloc_node: OK
Testing event kmem_cache_alloc_node: OK
Testing event kfree: OK
Testing event kmem_cache_free: OK
Testing event irq_handler_exit: OK
Testing event irq_handler_entry: OK
Testing event softirq_entry: OK
Testing event softirq_exit: OK
Testing event lock_acquired: OK
Testing event lock_acquire: OK
Testing event lock_release: OK
Testing event lock_contended: OK
Testing event sched_kthread_stop: <4>------------[ cut here ]------------
WARNING: at kernel/fork.c:988 copy_process+0x147/0xf7d()
Modules linked in:
Pid: 2, comm: kthreadd Not tainted 2.6.30-rc2-tip-01581-gf4879a9-dirty #34509
Call Trace:
 [<ffffffff80249801>] warn_slowpath+0x96/0xca
 [<ffffffff8026f200>] ? trace_hardirqs_on_caller+0xff/0x14c
 [<ffffffff8026f25a>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff80261cb6>] ? __mutex_init+0x5a/0x64
 [<ffffffff802accdf>] ? perf_counter_init_task+0x65/0x17b
 [<ffffffff80247ca6>] copy_process+0x147/0xf7d
 [<ffffffff80211d57>] ? trace+0x3a/0x73
 [<ffffffff80248c7b>] do_fork+0x19f/0x478
 [<ffffffff8025f03c>] ? kthreadd+0xb8/0x11c
 [<ffffffff80212f12>] kernel_thread+0x82/0xe0
 [<ffffffff808cbad4>] ? schedule+0x11f/0x5e1
 [<ffffffff8025f0a0>] ? kthread+0x0/0x80
 [<ffffffff80212f70>] ? child_rip+0x0/0x20
 [<ffffffff8025f050>] ? kthreadd+0xcc/0x11c
 [<ffffffff80fde140>] ? early_idt_handler+0x0/0x71
 [<ffffffff80212f7a>] child_rip+0xa/0x20
 [<ffffffff80212a52>] ? restore_args+0x0/0x30
 [<ffffffff8025ef84>] ? kthreadd+0x0/0x11c
 [<ffffffff80212f70>] ? child_rip+0x0/0x20
---[ end trace 0843ba422c5d704e ]---
OK
Testing event sched_kthread_stop_ret: OK
Testing event sched_wait_task: OK
Testing event sched_wakeup: OK
Testing event sched_wakeup_new: OK
Testing event sched_switch: OK
Testing event sched_migrate_task: OK
Testing event sched_process_free: OK
Testing event sched_process_exit: OK
Testing event sched_process_wait: OK
Testing event sched_process_fork: OK
Testing event sched_signal_send: OK
Running tests on trace event systems:
Testing event system skb: OK
Testing event system kmem: OK
Testing event system irq: OK
Testing event system lockdep: OK
Testing event system sched: OK
Running tests on all trace events:
Testing all events: OK
initcall event_trace_self_tests_init+0x0/0x38 returned 0 after 444440 usecs
calling  fail_page_alloc_debugfs+0x0/0xe4 @ 1
initcall fail_page_alloc_debugfs+0x0/0xe4 returned 0 after 78 usecs
calling  max_swapfiles_check+0x0/0x8 @ 1
initcall max_swapfiles_check+0x0/0x8 returned 0 after 1 usecs

View attachment "config" of type "text/plain" (65088 bytes)