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From: Sergei Trofimovich on 15 Jul 2010 13:20
> > [ 7.582027] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/1255
> > [ 7.582038] caller is nr_iowait_cpu+0x15/0x2b
> > [ 7.582044] Pid: 1255, comm: modprobe Not tainted 2.6.35-rc3 #87
> > [ 7.582048] Call Trace:
> > [ 7.582059] [<ffffffff81185470>] debug_smp_processor_id+0xc4/0xe0
> > [ 7.582067] [<ffffffff810265cd>] nr_iowait_cpu+0x15/0x2b
> > [ 7.582075] [<ffffffff81053b78>] update_ts_time_stats+0x37/0x72
> > [ 7.582083] [<ffffffff8104f5b5>] ? ktime_get+0x60/0xb9
> > [ 7.582089] [<ffffffff81053d2d>] get_cpu_idle_time_us+0x44/0x63
> > [ 7.582100] [<ffffffff8126f516>] cpufreq_governor_dbs+0xe1/0x3cf
> > [ 7.582109] [<ffffffff8104bb5e>] ? notifier_call_chain+0x32/0x5e
> > [ 7.582116] [<ffffffff8126c87e>] __cpufreq_governor+0xc7/0x105
> > [ 7.582124] [<ffffffff8126d66c>] __cpufreq_set_policy+0x1a8/0x222
> > [ 7.582131] [<ffffffff8126d977>] cpufreq_add_dev_interface+0x291/0x2ac
> > [ 7.582139] [<ffffffff8126e22e>] ? handle_update+0x0/0x33
> > [ 7.582147] [<ffffffff8126e107>] cpufreq_add_dev+0x4b9/0x4c9
> > [ 7.582157] [<ffffffff811ff373>] sysdev_driver_register+0xbf/0x119
> > [ 7.582164] [<ffffffff8126c9a8>] cpufreq_register_driver+0xb9/0x1a5
> > [ 7.582174] [<ffffffffa02e40d7>] acpi_cpufreq_init+0xd7/0x10d [acpi_cpufreq]
> > [ 7.582183] [<ffffffffa02e4000>] ? acpi_cpufreq_init+0x0/0x10d [acpi_cpufreq]
> > [ 7.582191] [<ffffffff810001ef>] do_one_initcall+0x59/0x149
> > [ 7.582199] [<ffffffff8105cced>] sys_init_module+0x9c/0x1db
> > [ 7.582206] [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b
> >
> > Attached whole config and dmesg.
>
> It seems to be reproducible on each boot. Today's one:
> [ 20.242755] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/1462
> [ 20.242765] caller is nr_iowait_cpu+0x15/0x2b
> [ 20.242770] Pid: 1462, comm: modprobe Not tainted 2.6.35-rc3 #87
> [ 20.242774] Call Trace:
> [ 20.242784] [<ffffffff81185470>] debug_smp_processor_id+0xc4/0xe0
> [ 20.242790] [<ffffffff810265cd>] nr_iowait_cpu+0x15/0x2b
> [ 20.242798] [<ffffffff81053b78>] update_ts_time_stats+0x37/0x72
> [ 20.242805] [<ffffffff8104f5b5>] ? ktime_get+0x60/0xb9
> [ 20.242811] [<ffffffff81053d2d>] get_cpu_idle_time_us+0x44/0x63
> [ 20.242820] [<ffffffff8126f516>] cpufreq_governor_dbs+0xe1/0x3cf
> [ 20.242828] [<ffffffff8104bb5e>] ? notifier_call_chain+0x32/0x5e
> [ 20.242835] [<ffffffff8126c87e>] __cpufreq_governor+0xc7/0x105
> [ 20.242842] [<ffffffff8126d66c>] __cpufreq_set_policy+0x1a8/0x222
> [ 20.242848] [<ffffffff8126d977>] cpufreq_add_dev_interface+0x291/0x2ac
> [ 20.242855] [<ffffffff8126e22e>] ? handle_update+0x0/0x33
> [ 20.242863] [<ffffffff8126e107>] cpufreq_add_dev+0x4b9/0x4c9
> [ 20.242871] [<ffffffff811ff373>] sysdev_driver_register+0xbf/0x119
> [ 20.242878] [<ffffffff8126c9a8>] cpufreq_register_driver+0xb9/0x1a5
> [ 20.242887] [<ffffffffa02e40d7>] acpi_cpufreq_init+0xd7/0x10d [acpi_cpufreq]
> [ 20.242894] [<ffffffffa02e4000>] ? acpi_cpufreq_init+0x0/0x10d [acpi_cpufreq]
> [ 20.242902] [<ffffffff810001ef>] do_one_initcall+0x59/0x149
> [ 20.242909] [<ffffffff8105cced>] sys_init_module+0x9c/0x1db
> [ 20.242915] [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b

Who cares, but v2.6.35-rc5-25-g2f7989e does not contain this problem anymore.

--

Sergei
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