linux-kernel - Re: [PATCH -mm] oprofile: BUG scheduling while atomic

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Date:	Mon, 22 Sep 2008 11:55:05 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrea Righi <righi.andrea@...il.com>
Cc:	robert.richter@....com, Andrew Morton <akpm@...ux-foundation.org>,
	oprofile-list@...ts.sf.net, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] oprofile: BUG scheduling while atomic


* Andrea Righi <righi.andrea@...il.com> wrote:

> nmi_shutdown() calls unregister_die_notifier() from an atomic context
> after setting preempt_disable() via get_cpu_var():
> 
> [ 1049.404154] BUG: scheduling while atomic: oprofiled/7796/0x00000002
> [ 1049.404171] INFO: lockdep is turned off.
> [ 1049.404176] Modules linked in: oprofile af_packet rfcomm l2cap kvm_intel kvm i915 drm acpi_cpufreq cpufreq_userspace cpufreq_conservative cpufreq_ondemand cpufreq_powersave freq_table container sbs sbshc dm_mod arc4 ecb cryptomgr aead snd_hda_intel crypto_blkcipher snd_pcm_oss crypto_algapi snd_pcm iwlagn iwlcore snd_timer iTCO_wdt led_class btusb iTCO_vendor_support snd psmouse bluetooth mac80211 soundcore cfg80211 snd_page_alloc intel_agp video output button battery ac dcdbas evdev ext3 jbd mbcache sg sd_mod piix ata_piix libata scsi_mod dock tg3 libphy ehci_hcd uhci_hcd usbcore thermal processor fan fuse
> [ 1049.404362] Pid: 7796, comm: oprofiled Not tainted 2.6.27-rc5-mm1 #30
> [ 1049.404368] Call Trace:
> [ 1049.404384]  [<ffffffff804769fd>] thread_return+0x4a0/0x7d3
> [ 1049.404396]  [<ffffffff8026ad92>] generic_exec_single+0x52/0xe0
> [ 1049.404405]  [<ffffffff8026ae1a>] generic_exec_single+0xda/0xe0
> [ 1049.404414]  [<ffffffff8026aee3>] smp_call_function_single+0x73/0x150
> [ 1049.404423]  [<ffffffff804770c5>] schedule_timeout+0x95/0xd0
> [ 1049.404430]  [<ffffffff80476083>] wait_for_common+0x43/0x180
> [ 1049.404438]  [<ffffffff80476154>] wait_for_common+0x114/0x180
> [ 1049.404448]  [<ffffffff80236980>] default_wake_function+0x0/0x10
> [ 1049.404457]  [<ffffffff8024f810>] synchronize_rcu+0x30/0x40
> [ 1049.404463]  [<ffffffff8024f890>] wakeme_after_rcu+0x0/0x10
> [ 1049.404472]  [<ffffffff80479ca0>] _spin_unlock_irqrestore+0x40/0x80
> [ 1049.404482]  [<ffffffff80256def>] atomic_notifier_chain_unregister+0x3f/0x60
> [ 1049.404501]  [<ffffffffa03d8801>] nmi_shutdown+0x51/0x90 [oprofile]
> [ 1049.404517]  [<ffffffffa03d6134>] oprofile_shutdown+0x34/0x70 [oprofile]
> [ 1049.404532]  [<ffffffffa03d721e>] event_buffer_release+0xe/0x40 [oprofile]
> [ 1049.404543]  [<ffffffff802bdcdd>] __fput+0xcd/0x240
> [ 1049.404551]  [<ffffffff802baa74>] filp_close+0x54/0x90
> [ 1049.404560]  [<ffffffff8023e1d1>] put_files_struct+0xb1/0xd0
> [ 1049.404568]  [<ffffffff8023f82f>] do_exit+0x18f/0x930
> [ 1049.404576]  [<ffffffff8020be03>] restore_args+0x0/0x30
> [ 1049.404584]  [<ffffffff80240006>] do_group_exit+0x36/0xa0
> [ 1049.404592]  [<ffffffff8020b7cb>] system_call_fastpath+0x16/0x1b
> 
> This can be easily triggered with 'opcontrol --shutdown'.
> 
> Simply move get_cpu_var() above unregister_die_notifier().
> 
> Signed-off-by: Andrea Righi <righi.andrea@...il.com>

applied to tip/x86/urgent, thanks Andrea!

Robert, do you agree with the fix?

	Ingo
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