Greetings,
Lockdep doesn't approve of cpufreq, and seemingly with cause... I had to
poke SysRq-O.
[ 1103.164377] Disabling non-boot CPUs ...
[ 1103.171094] stopped custom tracer.
[ 1103.174614]
[ 1103.174618] =======================================================
[ 1103.182692] [ INFO: possible circular locking dependency detected ]
[ 1103.189178] 2.6.19.1-rt14-smp #3
[ 1103.192564] -------------------------------------------------------
[ 1103.199062] s2ram/6643 is trying to acquire lock:
[ 1103.203976] (cpu_bitmask_lock){--..}, at: [<c104a085>] lock_cpu_hotplug+0x22/0x6d
[ 1103.211988]
[ 1103.211991] but task is already holding lock:
[ 1103.218112] (workqueue_mutex){--..}, at: [<c1038a2a>] workqueue_cpu_callback+0x1c6/0x299
[ 1103.226702]
[ 1103.226706] which lock already depends on the new lock.
[ 1103.226708]
[ 1103.235197]
[ 1103.235203] the existing dependency chain (in reverse order) is:
[ 1103.242992]
[ 1103.242994] -> #3 (workqueue_mutex){--..}:
[ 1103.248905] [<c1042c21>] add_lock_to_list+0x39/0x91
[ 1103.254859] [<c10454fc>] __lock_acquire+0xc65/0xd3a
[ 1103.260760] [<c104562e>] lock_acquire+0x5d/0x79
[ 1103.266271] [<c13ec1b2>] _mutex_lock+0x2b/0x38
[ 1103.271801] [<c1038516>] __create_workqueue+0x5f/0x16c
[ 1103.278013] [<c131cf1f>] cpufreq_governor_dbs+0x274/0x321
[ 1103.284429] [<c131ae69>] __cpufreq_governor+0x22/0x15e
[ 1103.290652] [<c131b426>] __cpufreq_set_policy+0xe6/0x135
[ 1103.296994] [<c131b990>] store_scaling_governor+0xa8/0x1e8
[ 1103.303577] [<c131c335>] store+0x37/0x4a
[ 1103.308517] [<c10c14a9>] sysfs_write_file+0x87/0xc1
[ 1103.314442] [<c10801e8>] vfs_write+0xa6/0x170
[ 1103.319795] [<c108089c>] sys_write+0x3d/0x64
[ 1103.325060] [<c1003293>] syscall_call+0x7/0xb
[ 1103.330450] [<b7cc9e0e>] 0xb7cc9e0e
[ 1103.334948] [<ffffffff>] 0xffffffff
[ 1103.339453]
[ 1103.339456] -> #2 (dbs_mutex){--..}:
[ 1103.347070] [<c1042c21>] add_lock_to_list+0x39/0x91
[ 1103.347089] [<c10454fc>] __lock_acquire+0xc65/0xd3a
[ 1103.347098] [<c104562e>] lock_acquire+0x5d/0x79
[ 1103.347105] [<c13ec1b2>] _mutex_lock+0x2b/0x38
[ 1103.347115] [<c131cdba>] cpufreq_governor_dbs+0x10f/0x321
[ 1103.347124] [<c131ae69>] __cpufreq_governor+0x22/0x15e
[ 1103.347134] [<c131b426>] __cpufreq_set_policy+0xe6/0x135
[ 1103.347142] [<c131b990>] store_scaling_governor+0xa8/0x1e8
[ 1103.347151] [<c131c335>] store+0x37/0x4a
[ 1103.347158] [<c10c14a9>] sysfs_write_file+0x87/0xc1
[ 1103.347167] [<c10801e8>] vfs_write+0xa6/0x170
[ 1103.347176] [<c108089c>] sys_write+0x3d/0x64
[ 1103.347184] [<c1003293>] syscall_call+0x7/0xb
[ 1103.347192] [<b7cc9e0e>] 0xb7cc9e0e
[ 1103.347212] [<ffffffff>] 0xffffffff
[ 1103.347221]
[ 1103.347222] -> #1 (&policy->lock){--..}:
[ 1103.347227] [<c1042c21>] add_lock_to_list+0x39/0x91
[ 1103.347235] [<c10454fc>] __lock_acquire+0xc65/0xd3a
[ 1103.347242] [<c104562e>] lock_acquire+0x5d/0x79
[ 1103.347250] [<c13ec1b2>] _mutex_lock+0x2b/0x38
[ 1103.347258] [<c131b854>] cpufreq_set_policy+0x35/0x79
[ 1103.347266] [<c131c0f5>] cpufreq_add_dev+0x2b4/0x451
[ 1103.347274] [<c126734f>] sysdev_driver_register+0x59/0x96
[ 1103.347284] [<c131c582>] cpufreq_register_driver+0x66/0xfc
[ 1103.347292] [<c1630df9>] cpufreq_p4_init+0x3a/0x51
[ 1103.347301] [<c10004b1>] init+0x128/0x3da
[ 1103.347308] [<c1003f1b>] kernel_thread_helper+0x7/0x1c
[ 1103.347316] [<ffffffff>] 0xffffffff
[ 1103.347371]
[ 1103.347372] -> #0 (cpu_bitmask_lock){--..}:
[ 1103.347380] [<c1043846>] print_circular_bug_tail+0x39/0x73
[ 1103.347389] [<c1045375>] __lock_acquire+0xade/0xd3a
[ 1103.347397] [<c104562e>] lock_acquire+0x5d/0x79
[ 1103.347404] [<c13ec1b2>] _mutex_lock+0x2b/0x38
[ 1103.347412] [<c104a085>] lock_cpu_hotplug+0x22/0x6d
[ 1103.347420] [<c131bc31>] cpufreq_driver_target+0x27/0x5d
[ 1103.347429] [<c131c2d9>] cpufreq_cpu_callback+0x47/0x6c
[ 1103.347437] [<c1034fd6>] notifier_call_chain+0x2c/0x39
[ 1103.347446] [<c1034fff>] raw_notifier_call_chain+0x8/0xa
[ 1103.347454] [<c1049dc5>] _cpu_down+0x4c/0x25c
[ 1103.347463] [<c104a1b5>] disable_nonboot_cpus+0x92/0x16d
[ 1103.347471] [<c104fc39>] enter_state+0x72/0x1a6
[ 1103.347480] [<c104fe10>] state_store+0xa3/0xac
[ 1103.347488] [<c10c1170>] subsys_attr_store+0x20/0x25
[ 1103.347496] [<c10c14a9>] sysfs_write_file+0x87/0xc1
[ 1103.347503] [<c10801e8>] vfs_write+0xa6/0x170
[ 1103.347511] [<c108089c>] sys_write+0x3d/0x64
[ 1103.347519] [<c1003293>] syscall_call+0x7/0xb
[ 1103.347526] [<b7e7be0e>] 0xb7e7be0e
[ 1103.347535] [<ffffffff>] 0xffffffff
[ 1103.347544]
[ 1103.347545] other info that might help us debug this:
[ 1103.347546]
[ 1103.347549] 2 locks held by s2ram/6643:
[ 1103.347551] #0: (cpu_add_remove_lock){--..}, at: [<c104a136>] disable_nonboot_cpus+0x13/0x16d
[ 1103.347561] #1: (workqueue_mutex){--..}, at: [<c1038a2a>] workqueue_cpu_callback+0x1c6/0x299
[ 1103.347570]
[ 1103.347571] stack backtrace:
[ 1103.347576] [<c1004303>] dump_trace+0x1c1/0x1f0
[ 1103.347584] [<c100434c>] show_trace_log_lvl+0x1a/0x30
[ 1103.347589] [<c1004abd>] show_trace+0x12/0x14
[ 1103.347595] [<c1004bde>] dump_stack+0x19/0x1b
[ 1103.347600] [<c1043877>] print_circular_bug_tail+0x6a/0x73
[ 1103.347606] [<c1045375>] __lock_acquire+0xade/0xd3a
[ 1103.347611] [<c104562e>] lock_acquire+0x5d/0x79
[ 1103.347616] [<c13ec1b2>] _mutex_lock+0x2b/0x38
[ 1103.347621] [<c104a085>] lock_cpu_hotplug+0x22/0x6d
[ 1103.347627] [<c131bc31>] cpufreq_driver_target+0x27/0x5d
[ 1103.347633] [<c131c2d9>] cpufreq_cpu_callback+0x47/0x6c
[ 1103.347639] [<c1034fd6>] notifier_call_chain+0x2c/0x39
[ 1103.347644] [<c1034fff>] raw_notifier_call_chain+0x8/0xa
[ 1103.347651] [<c1049dc5>] _cpu_down+0x4c/0x25c
[ 1103.347656] [<c104a1b5>] disable_nonboot_cpus+0x92/0x16d
[ 1103.347662] [<c104fc39>] enter_state+0x72/0x1a6
[ 1103.347668] [<c104fe10>] state_store+0xa3/0xac
[ 1103.347674] [<c10c1170>] subsys_attr_store+0x20/0x25
[ 1103.347679] [<c10c14a9>] sysfs_write_file+0x87/0xc1
[ 1103.347684] [<c10801e8>] vfs_write+0xa6/0x170
[ 1103.347690] [<c108089c>] sys_write+0x3d/0x64
[ 1103.347695] [<c1003293>] syscall_call+0x7/0xb
[ 1103.347701] [<b7e7be0e>] 0xb7e7be0e
[ 1103.347706] =======================
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