linux-kernel - 2.6.35-rc1: Call trace: BUG: using smp_processor_id() in preemptible [00000000] code: cpufreq-set/2344 (cpufreq-releated?)

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Date:	Mon, 31 May 2010 08:27:23 +0200
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	LKML <linux-kernel@...r.kernel.org>, cpufreq@...r.kernel.org
Cc:	Dave Jones <davej@...hat.com>, Thomas Renninger <trenn@...e.de>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	markgross <mgross@...ux.intel.com>
Subject: 2.6.35-rc1: Call trace: BUG: using smp_processor_id() in preemptible 
	[00000000] code: cpufreq-set/2344 (cpufreq-releated?)

Hi,

with 2.6.35-rc1 I get a cpufreq-related Call trace on startup on a
32-bit Debian/sid system.

Below I added (see investigations at the end):

1. the version of cpufrequtils I am using
2. an output of cpufreq-related loaded kernel-modules
3. an output of cpufreq-related setting in kernel-config

Furthermore, I have attched the full dmesg output and kernel-config file.

Here is the Call trace:

[   31.647049] BUG: using smp_processor_id() in preemptible [00000000]
code: cpufreq-set/2344
[   31.647299] caller is nr_iowait_cpu+0xb/0x1a
[   31.647303] Pid: 2344, comm: cpufreq-set Not tainted
2.6.35-rc1-iniza-686-kms #1
[   31.647306] Call Trace:
[   31.647314]  [<c111fdd9>] ? debug_smp_processor_id+0xa5/0xb8
[   31.647319]  [<c1022f93>] ? nr_iowait_cpu+0xb/0x1a
[   31.647325]  [<c104a93c>] ? update_ts_time_stats+0x36/0x92
[   31.647329]  [<c1045fcb>] ? ktime_get+0x5b/0xd9
[   31.647333]  [<c104aae9>] ? get_cpu_idle_time_us+0x36/0x62
[   31.647340]  [<f94e433d>] ? get_cpu_idle_time+0x12/0x127 [cpufreq_ondemand]
[   31.647345]  [<c10dea11>] ? sysfs_add_file_mode+0x48/0x66
[   31.647350]  [<c10e0827>] ? internal_create_group+0xcf/0x134
[   31.647355]  [<f94e4a3b>] ? cpufreq_governor_dbs+0xaa/0x2a3
[cpufreq_ondemand]
[   31.647361]  [<c119d94a>] ? __cpufreq_governor+0x2c/0x63
[   31.647365]  [<c119e80a>] ? __cpufreq_set_policy+0xea/0x11d
[   31.647370]  [<c119ea74>] ? store_scaling_governor+0x58/0x7c
[   31.647375]  [<c119ee09>] ? handle_update+0x0/0x8
[   31.647381]  [<c1225d70>] ? _raw_spin_unlock_irqrestore+0x22/0x2c
[   31.647385]  [<c119ea1c>] ? store_scaling_governor+0x0/0x7c
[   31.647389]  [<c119e708>] ? store+0x3c/0x54
[   31.647393]  [<c10de76d>] ? sysfs_write_file+0xb8/0xe5
[   31.647397]  [<c10de6b5>] ? sysfs_write_file+0x0/0xe5
[   31.647403]  [<c109f7c6>] ? vfs_write+0x7f/0xda
[   31.647408]  [<c101dad8>] ? do_page_fault+0x1fb/0x25f
[   31.647412]  [<c109f8b4>] ? sys_write+0x3c/0x60
[   31.647417]  [<c1002e18>] ? sysenter_do_call+0x12/0x28

Hope this helps fixing the problem.

Kind Regards,
- Sedat -

P.S.:
Recently I watched a video with a speeh of Greg K-H [1] and extracted
the maintainers/contributors via:

$ ./scripts/get_maintainer.pl -f drivers/cpuidle/governors/menu.c <---
nr_iowait_cpu()
$ ./scripts/get_maintainer.pl -f drivers/cpufreq/cpufreq_ondemand.c
<--- [cpufreq_ondemand]

[1] Write and Submit your first Linux kernel Patch:
http://fosdem.org/2010/schedule/events/linuxkernelpatch

------ INVESTIGATIONS -----

$ env COLUMNS=120 dpkg -l | grep -i cpufreq
ii  cpufrequtils             007-1                    utilities to
deal with the cpufreq Linux kernel feature
ii  libcpufreq0              007-1                    shared library
to deal with the cpufreq Linux kernel feature

$ sudo lsmod | grep freq | sort
acpi_cpufreq            4343  1
cpufreq_conservative     6260  0
cpufreq_ondemand        5810  2
cpufreq_performance      590  0
cpufreq_powersave        582  0
cpufreq_stats           1969  0
freq_table              1647  3 acpi_cpufreq,cpufreq_ondemand,cpufreq_stats
mperf                    899  1 acpi_cpufreq
processor              22099  3 acpi_cpufreq

$ grep -i freq /boot/config-2.6.35-rc1-iniza-686-kms | grep -i cpu
# CPU Frequency scaling
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=m
# CONFIG_CPU_FREQ_DEBUG is not set
CONFIG_CPU_FREQ_STAT=m
# CONFIG_CPU_FREQ_STAT_DETAILS is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=m
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=m
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m
# CPUFreq processor drivers
# CONFIG_X86_PCC_CPUFREQ is not set
CONFIG_X86_ACPI_CPUFREQ=m
CONFIG_X86_CPUFREQ_NFORCE2=m

View attachment "dmesg_2.6.35-rc1-iniza-686-kms.txt" of type "text/plain" (62594 bytes)

View attachment "config-2.6.35-rc1-iniza-686-kms.txt" of type "text/plain" (116642 bytes)