[Bug 81701] New: OOPS in cpufreq driver with AMD Kaveri CPU

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            Bug ID: 81701
           Summary: OOPS in cpufreq driver with AMD Kaveri CPU
           Product: Power Management
           Version: 2.5
    Kernel Version: 3.16.0
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: cpufreq
          Assignee: cpufreq@xxxxxxxxxxxxxxx
          Reporter: oleksandr@xxxxxxxxxxxxxx
        Regression: No

Occasionally I get my machine hung completely. Fortunately, I've got and saved 
oops listing using netconsole before hang, and here it is [1].

Here is little piece of oops from the link above:

[15051.270461] BUG: unable to handle kernel paging request at 00000000ff5ae8e4
[15051.271583] IP: [<ffffffff8109ae6e>] srcu_notifier_call_chain+0xe/0x20
[15051.956205] Call Trace:
[15051.980641]  [<ffffffff81606085>] ? __cpufreq_notify_transition+0x95/0x1e0
[15052.005640]  [<ffffffff816081ee>] cpufreq_notify_transition+0x3e/0x70
[15052.030240]  [<ffffffff816083d8>] cpufreq_freq_transition_begin+0xe8/0x130
[15052.054522]  [<ffffffff813b8940>] ? ucs2_strncmp+0x70/0x70
[15052.078208]  [<ffffffff816089bf>] __target_index+0xbf/0x1a0
[15052.101348]  [<ffffffff81608b9c>] __cpufreq_driver_target+0xfc/0x160
[15052.124250]  [<ffffffff8160b0d4>] od_check_cpu+0xa4/0xb0
[15052.146789]  [<ffffffff8160c9ec>] dbs_check_cpu+0x16c/0x1c0
[15052.168935]  [<ffffffff8160b4dd>] od_dbs_timer+0x11d/0x180
[15052.190607]  [<ffffffff8108e6ff>] process_one_work+0x17f/0x4c0
[15052.211825]  [<ffffffff8108f46b>] worker_thread+0x11b/0x3f0
[15052.232490]  [<ffffffff8108f350>] ? create_and_start_worker+0x80/0x80
[15052.253127]  [<ffffffff81096479>] kthread+0xc9/0xe0
[15052.273292]  [<ffffffff810963b0>] ? flush_kthread_worker+0xb0/0xb0
[15052.293487]  [<ffffffff81793efc>] ret_from_fork+0x7c/0xb0
[15052.313544]  [<ffffffff810963b0>] ? flush_kthread_worker+0xb0/0xb0

Also here is my lspci [2] and cpuinfo [3] as well.

Vanilla 3.15.8 and 3.16.0 are affected as well as latest Ubuntu 3.13 kernel.

No visible reason to trigger the bug. After hang machine doesn't respond via 
network, there's no disk IO, and also it doesn't respond to pressing power 
button in order to perform soft off.

[1] https://gist.github.com/085af9da81197faf6637
[2] https://gist.github.com/318ebda5576b099590b8
[3] https://gist.github.com/9c1307463c7ad6835b2d

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