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Date: Mon, 31 Oct 2005 11:34:13 -0800
From: Andrew Morton <akpm@osdl.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: linux-kernel@vger.kernel.org, Ashok Raj <ashok.raj@intel.com>,
       Dave Jones <davej@codemonkey.org.uk>, Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.14-git3: scheduling while atomic from cpufreq on Athlon64
Message-Id: <20051031113413.34a599cd.akpm@osdl.org>
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"Rafael J. Wysocki" <rjw@sisk.pl> wrote:
>
> Hi,
> 
> I'm getting some "scheduling while atomic" messages from 2.6.14-git3 on boot
> and on suspend/resume, eg.:
> 
> NET: Registered protocol family 1
> powernow-k8: Found 1 AMD Athlon 64 / Opteron processors (version 1.50.4)
> powernow-k8:    0 : fid 0x0 (800 MHz), vid 0x12 (1100 mV)
> powernow-k8:    1 : fid 0x8 (1600 MHz), vid 0x6 (1400 mV)
> powernow-k8:    2 : fid 0xa (1800 MHz), vid 0x2 (1500 mV)
> cpu_init done, current fid 0xa, vid 0x2
> scheduling while atomic: swapper/0x00000001/1
> 
> Call Trace:<ffffffff8035014a>{schedule+122} <ffffffff80163576>{poison_obj+70}
>        <ffffffff801be269>{sysfs_new_dirent+41} <ffffffff80162989>{dbg_redzone1+25}
>        <ffffffff801be269>{sysfs_new_dirent+41} <ffffffff80163908>{cache_alloc_debugcheck_after+280}
>        <ffffffff8011cf1b>{powernowk8_target+139} <ffffffff80162989>{dbg_redzone1+25}
>        <ffffffff802e0830>{cpufreq_stat_notifier_policy+304}
>        <ffffffff802dfdb4>{__cpufreq_driver_target+116} <ffffffff801be269>{sysfs_new_dirent+41}
>        <ffffffff802e097e>{cpufreq_governor_performance+62}
>        <ffffffff802dec8d>{__cpufreq_governor+173} <ffffffff802df3a8>{__cpufreq_set_policy+440}
>        <ffffffff802df5bf>{cpufreq_set_policy+79} <ffffffff802df946>{cpufreq_add_dev+806}
>        <ffffffff802df540>{handle_update+0} <ffffffff802ae21a>{sysdev_driver_register+170}
>        <ffffffff802df106>{cpufreq_register_driver+198} <ffffffff8010c122>{init+194}
>        <ffffffff8010f556>{child_rip+8} <ffffffff8010c060>{init+0}
>        <ffffffff8010f54e>{child_rip+0} 
> scheduling while atomic: swapper/0x00000001/1
> 
> Call Trace:<ffffffff8035014a>{schedule+122} <ffffffff802e2453>{cpufreq_frequency_table_target+371}
>        <ffffffff8011d60c>{powernowk8_target+1916} <ffffffff802dfdb4>{__cpufreq_driver_target+116}
>        <ffffffff801be269>{sysfs_new_dirent+41} <ffffffff802e097e>{cpufreq_governor_performance+62}
>        <ffffffff802dec8d>{__cpufreq_governor+173} <ffffffff802df3a8>{__cpufreq_set_policy+440}
>        <ffffffff802df5bf>{cpufreq_set_policy+79} <ffffffff802df946>{cpufreq_add_dev+806}
>        <ffffffff802df540>{handle_update+0} <ffffffff802ae21a>{sysdev_driver_register+170}
>        <ffffffff802df106>{cpufreq_register_driver+198} <ffffffff8010c122>{init+194}
>        <ffffffff8010f556>{child_rip+8} <ffffffff8010c060>{init+0}
>        <ffffffff8010f54e>{child_rip+0} 
> input: AT Translated Set 2 keyboard//class/input as input1
> scheduling while atomic: swapper/0x00000001/1
> 
> Call Trace:<ffffffff8035014a>{schedule+122} <ffffffff802e2453>{cpufreq_frequency_table_target+371}
>        <ffffffff8011cf1b>{powernowk8_target+139} <ffffffff802dfdb4>{__cpufreq_driver_target+116}
>        <ffffffff801be269>{sysfs_new_dirent+41} <ffffffff802e097e>{cpufreq_governor_performance+62}
>        <ffffffff802dec8d>{__cpufreq_governor+173} <ffffffff802df417>{__cpufreq_set_policy+551}
>        <ffffffff802df5bf>{cpufreq_set_policy+79} <ffffffff802df946>{cpufreq_add_dev+806}
>        <ffffffff802df540>{handle_update+0} <ffffffff802ae21a>{sysdev_driver_register+170}
>        <ffffffff802df106>{cpufreq_register_driver+198} <ffffffff8010c122>{init+194}
>        <ffffffff8010f556>{child_rip+8} <ffffffff8010c060>{init+0}
>        <ffffffff8010f54e>{child_rip+0} 
> scheduling while atomic: swapper/0x00000001/1
> 
> Call Trace:<ffffffff8035014a>{schedule+122} <ffffffff802e2453>{cpufreq_frequency_table_target+371}
>        <ffffffff8011d60c>{powernowk8_target+1916} <ffffffff802dfdb4>{__cpufreq_driver_target+116}
>        <ffffffff801be269>{sysfs_new_dirent+41} <ffffffff802e097e>{cpufreq_governor_performance+62}
>        <ffffffff802dec8d>{__cpufreq_governor+173} <ffffffff802df417>{__cpufreq_set_policy+551}
>        <ffffffff802df5bf>{cpufreq_set_policy+79} <ffffffff802df946>{cpufreq_add_dev+806}
>        <ffffffff802df540>{handle_update+0} <ffffffff802ae21a>{sysdev_driver_register+170}
>        <ffffffff802df106>{cpufreq_register_driver+198} <ffffffff8010c122>{init+194}
>        <ffffffff8010f556>{child_rip+8} <ffffffff8010c060>{init+0}
>        <ffffffff8010f54e>{child_rip+0} 

Well I can't find it.  Ingo, didn't you have a debug patch which would help
us identify where this atomic section started?

> Additionally there are some problems with freezing processes by swsusp.

More details on this?
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