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Date:	Thu, 07 Aug 2014 23:53:17 +0300
From:	Oleksandr Natalenko <oleksandr@...alenko.name>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pm@...r.kernel.org
Subject: Re: [BUG] oops in cpufreq driver with AMD Kaveri CPU

Disabling cpufreq code in kernel config works around this issue.

Is this bug related to sleeping in atomic context, which is caused by improper 
GFP_KERNEL usage instead of GFP_ATOMIC? Should I test tat patch, or there will 
be another fix?

On Tuesday 05 August 2014 00:39:11 Oleksandr Natalenko wrote:
> Hello.
> 
> 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
-- 
Oleksandr post-factum Natalenko, MSc
pf-kernel community
https://natalenko.name/
--
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