linux-kernel - BUG: sleeping function called from invalid context at drivers/cpufreq/cpufreq.c:370

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Date:	Thu, 25 Sep 2014 15:59:04 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, oleg@...hat.com, torvalds@...ux-foundation.org,
	tglx@...utronix.de, ilya.dryomov@...tank.com,
	linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: BUG: sleeping function called from invalid context at
 drivers/cpufreq/cpufreq.c:370

On Thu, 2014-09-25 at 11:56 +0200, Mike Galbraith wrote: 
> On Thu, 2014-09-25 at 11:15 +0200, Peter Zijlstra wrote:
> 
> > I suppose just flipping the scheudle() and try_to_freeze() should do the
> > trick. Ugly code that, but then again, I think audit is known for that.
> > 
> > Can you give that a go?
> 
> Yeah, seems that fixed that one.

pcc-cpufreq: spin_lock() -> wait_event() -> gripe() gripe() gripe()...

[   50.756280] BUG: sleeping function called from invalid context at drivers/cpufreq/cpufreq.c:370
[   50.850582] in_atomic(): 1, irqs_disabled(): 0, pid: 2636, name: modprobe
[   50.926744] Preemption disabled at:[<ffffffffa04d74d7>] pcc_cpufreq_target+0x27/0x200 [pcc_cpufreq]
[   51.025044]
[   51.045454] CPU: 57 PID: 2636 Comm: modprobe Tainted: G            E  3.17.0-default #7
[   51.136727] Hardware name: Hewlett-Packard ProLiant DL980 G7, BIOS P66 07/07/2010
[   51.218484]  00000000ffffffff ffff88026c46b828 ffffffff81589dbd 0000000000000000
[   51.300293]  ffff880037978090 ffff88026c46b848 ffffffff8108e1df ffff880037978090
[   51.382666]  0000000000000000 ffff88026c46b878 ffffffff8108e298 ffff88026d73ec00
[   51.464884] Call Trace:
[   51.495159]  [<ffffffff81589dbd>] dump_stack+0x4d/0x90
[   51.555439]  [<ffffffff8108e1df>] ___might_sleep+0x10f/0x180
[   51.620610]  [<ffffffff8108e298>] __might_sleep+0x48/0xd0
[   51.684774]  [<ffffffff8145b905>] cpufreq_freq_transition_begin+0x75/0x140 drivers/cpufreq/cpufreq.c:370 wait_event(policy->transition_wait, !policy->transition_ongoing);
[   51.767992]  [<ffffffff8108fc99>] ? preempt_count_add+0xb9/0xc0
[   51.833294]  [<ffffffffa04d7513>] pcc_cpufreq_target+0x63/0x200 [pcc_cpufreq] drivers/cpufreq/pcc-cpufreq.c:207 spin_lock(&pcc_lock);
[   51.930204]  [<ffffffff810e0d0f>] ? update_ts_time_stats+0x7f/0xb0
[   52.009288]  [<ffffffff8145be55>] __cpufreq_driver_target+0x85/0x170
[   52.082479]  [<ffffffff8145e4c8>] od_check_cpu+0xa8/0xb0
[   52.143874]  [<ffffffff8145ef10>] dbs_check_cpu+0x180/0x1d0
[   52.207329]  [<ffffffff8145f310>] cpufreq_governor_dbs+0x3b0/0x720
[   52.276916]  [<ffffffff8145ebe3>] od_cpufreq_governor_dbs+0x33/0xe0
[   52.349048]  [<ffffffff814593d9>] __cpufreq_governor+0xa9/0x210
[   52.415040]  [<ffffffff81459fb2>] cpufreq_set_policy+0x1e2/0x2e0
[   52.480473]  [<ffffffff8145a6cc>] cpufreq_init_policy+0x8c/0x110
[   52.545829]  [<ffffffff8145c9a0>] ? cpufreq_update_policy+0x1b0/0x1b0
[   52.615796]  [<ffffffff8108fb99>] ? preempt_count_sub+0xb9/0x100
[   52.681961]  [<ffffffff8145c6c6>] __cpufreq_add_dev+0x596/0x6b0
[   52.746288]  [<ffffffffa016c608>] ? pcc_cpufreq_probe+0x4b4/0x4b4 [pcc_cpufreq]
[   52.830472]  [<ffffffff8145c7ee>] cpufreq_add_dev+0xe/0x10
[   52.894106]  [<ffffffff81408e81>] subsys_interface_register+0xc1/0xf0
[   52.970763]  [<ffffffff8108fb99>] ? preempt_count_sub+0xb9/0x100
[   53.038953]  [<ffffffff8145b3d7>] cpufreq_register_driver+0x117/0x2a0
[   53.110751]  [<ffffffffa016c65d>] pcc_cpufreq_init+0x55/0x9f8 [pcc_cpufreq]
[   53.186920]  [<ffffffffa016c608>] ? pcc_cpufreq_probe+0x4b4/0x4b4 [pcc_cpufreq]
[   53.267583]  [<ffffffff81000298>] do_one_initcall+0xc8/0x1f0
[   53.330601]  [<ffffffff811a731d>] ? __vunmap+0x9d/0x100
[   53.388285]  [<ffffffff810eb9a0>] do_init_module+0x30/0x1b0
[   53.451958]  [<ffffffff810edfa6>] load_module+0x686/0x710
[   53.514007]  [<ffffffff810ebb20>] ? do_init_module+0x1b0/0x1b0
[   53.581246]  [<ffffffff810ee1db>] SyS_init_module+0x9b/0xc0
[   53.644024]  [<ffffffff8158f7a9>] system_call_fastpath+0x16/0x1b


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