From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Linux PM list <linux-pm@vger.kernel.org>
Subject: Re: BUG: sleeping function called from invalid context at drivers/cpufreq/cpufreq.c:370
Date: Sat, 27 Sep 2014 21:57:59 +0200 [thread overview]
Message-ID: <2063016.pueklnzY3W@vostro.rjw.lan> (raw)
In-Reply-To: <1411798486.5097.46.camel@marge.simpson.net>
On Saturday, September 27, 2014 08:14:46 AM Mike Galbraith wrote:
> On Sat, 2014-09-27 at 00:44 +0200, Rafael J. Wysocki wrote:
>
> > Shouldn't that be pcc-cpufreq.c rather?
>
> Yeah, silly mouse copy/pasted the wrong gitk bits.
>
> > Also moving the spin_lock(&pcc_lock) after the cpufreq_freq_transition_begin()
> > should fix the problem too (like the below). Have you tried that?
>
> Have now. Yup, works and is prettier.
OK, thanks!
Below it goes again with full changelog.
---
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Subject: cpufreq: pcc-cpufreq: Fix wait_event() under spinlock
Fix the following bug introduced by commit 8fec051eea73 (cpufreq:
Convert existing drivers to use cpufreq_freq_transition_{begin|end})
that forgot to move the spin_lock() in pcc_cpufreq_target() past
cpufreq_freq_transition_begin() which calls wait_event():
BUG: sleeping function called from invalid context at drivers/cpufreq/cpufreq.c:370
in_atomic(): 1, irqs_disabled(): 0, pid: 2636, name: modprobe
Preemption disabled at:[<ffffffffa04d74d7>] pcc_cpufreq_target+0x27/0x200 [pcc_cpufreq]
[ 51.025044]
CPU: 57 PID: 2636 Comm: modprobe Tainted: G E 3.17.0-default #7
Hardware name: Hewlett-Packard ProLiant DL980 G7, BIOS P66 07/07/2010
00000000ffffffff ffff88026c46b828 ffffffff81589dbd 0000000000000000
ffff880037978090 ffff88026c46b848 ffffffff8108e1df ffff880037978090
0000000000000000 ffff88026c46b878 ffffffff8108e298 ffff88026d73ec00
Call Trace:
[<ffffffff81589dbd>] dump_stack+0x4d/0x90
[<ffffffff8108e1df>] ___might_sleep+0x10f/0x180
[<ffffffff8108e298>] __might_sleep+0x48/0xd0
[<ffffffff8145b905>] cpufreq_freq_transition_begin+0x75/0x140 drivers/cpufreq/cpufreq.c:370 wait_event(policy->transition_wait, !policy->transition_ongoing);
[<ffffffff8108fc99>] ? preempt_count_add+0xb9/0xc0
[<ffffffffa04d7513>] pcc_cpufreq_target+0x63/0x200 [pcc_cpufreq] drivers/cpufreq/pcc-cpufreq.c:207 spin_lock(&pcc_lock);
[<ffffffff810e0d0f>] ? update_ts_time_stats+0x7f/0xb0
[<ffffffff8145be55>] __cpufreq_driver_target+0x85/0x170
[<ffffffff8145e4c8>] od_check_cpu+0xa8/0xb0
[<ffffffff8145ef10>] dbs_check_cpu+0x180/0x1d0
[<ffffffff8145f310>] cpufreq_governor_dbs+0x3b0/0x720
[<ffffffff8145ebe3>] od_cpufreq_governor_dbs+0x33/0xe0
[<ffffffff814593d9>] __cpufreq_governor+0xa9/0x210
[<ffffffff81459fb2>] cpufreq_set_policy+0x1e2/0x2e0
[<ffffffff8145a6cc>] cpufreq_init_policy+0x8c/0x110
[<ffffffff8145c9a0>] ? cpufreq_update_policy+0x1b0/0x1b0
[<ffffffff8108fb99>] ? preempt_count_sub+0xb9/0x100
[<ffffffff8145c6c6>] __cpufreq_add_dev+0x596/0x6b0
[<ffffffffa016c608>] ? pcc_cpufreq_probe+0x4b4/0x4b4 [pcc_cpufreq]
[<ffffffff8145c7ee>] cpufreq_add_dev+0xe/0x10
[<ffffffff81408e81>] subsys_interface_register+0xc1/0xf0
[<ffffffff8108fb99>] ? preempt_count_sub+0xb9/0x100
[<ffffffff8145b3d7>] cpufreq_register_driver+0x117/0x2a0
[<ffffffffa016c65d>] pcc_cpufreq_init+0x55/0x9f8 [pcc_cpufreq]
[<ffffffffa016c608>] ? pcc_cpufreq_probe+0x4b4/0x4b4 [pcc_cpufreq]
[<ffffffff81000298>] do_one_initcall+0xc8/0x1f0
[<ffffffff811a731d>] ? __vunmap+0x9d/0x100
[<ffffffff810eb9a0>] do_init_module+0x30/0x1b0
[<ffffffff810edfa6>] load_module+0x686/0x710
[<ffffffff810ebb20>] ? do_init_module+0x1b0/0x1b0
[<ffffffff810ee1db>] SyS_init_module+0x9b/0xc0
[<ffffffff8158f7a9>] system_call_fastpath+0x16/0x1b
Fixes: 8fec051eea73 (cpufreq: Convert existing drivers to use cpufreq_freq_transition_{begin|end})
Reported-and-tested-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: 3.15+ <stable@vger.kernel.org> # 3.15+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/cpufreq/pcc-cpufreq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-pm/drivers/cpufreq/pcc-cpufreq.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/pcc-cpufreq.c
+++ linux-pm/drivers/cpufreq/pcc-cpufreq.c
@@ -204,7 +204,6 @@ static int pcc_cpufreq_target(struct cpu
u32 input_buffer;
int cpu;
- spin_lock(&pcc_lock);
cpu = policy->cpu;
pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu);
@@ -216,6 +215,7 @@ static int pcc_cpufreq_target(struct cpu
freqs.old = policy->cur;
freqs.new = target_freq;
cpufreq_freq_transition_begin(policy, &freqs);
+ spin_lock(&pcc_lock);
input_buffer = 0x1 | (((target_freq * 100)
/ (ioread32(&pcch_hdr->nominal) * 1000)) << 8);
next prev parent reply other threads:[~2014-09-27 19:38 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-24 8:18 [PATCH 00/11] nested sleeps, fixes and debug infrastructure Peter Zijlstra
2014-09-24 8:18 ` [PATCH 01/11] locking/mutex: Dont assume TASK_RUNNING Peter Zijlstra
2014-10-28 11:09 ` [tip:sched/core] locking/mutex: Don't " tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 02/11] wait: Provide infrastructure to deal with nested blocking Peter Zijlstra
2014-09-29 21:02 ` Oleg Nesterov
2014-10-02 7:37 ` Peter Zijlstra
2014-10-02 21:21 ` Oleg Nesterov
2014-10-28 11:09 ` [tip:sched/core] sched/wait: " tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 03/11] wait: Add might_sleep() Peter Zijlstra
2014-10-28 11:09 ` [tip:sched/core] sched/wait: Add might_sleep() checks tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 04/11] exit: Deal with nested sleeps Peter Zijlstra
2014-10-28 11:10 ` [tip:sched/core] sched, " tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 05/11] inotify: " Peter Zijlstra
2014-10-28 11:10 ` [tip:sched/core] sched, " tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 06/11] tty: " Peter Zijlstra
2014-10-28 11:10 ` [tip:sched/core] sched, " tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 07/11] smp: Correctly deal " Peter Zijlstra
2014-10-28 11:11 ` [tip:sched/core] sched, " tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 08/11] module: Fix nested sleep Peter Zijlstra
2014-09-29 22:18 ` Oleg Nesterov
2014-09-30 13:43 ` Peter Zijlstra
2014-10-28 11:11 ` [tip:sched/core] sched, modules: Fix nested sleep in add_unformed_module() tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 09/11] net: Clean up sk_wait_event() vs might_sleep() Peter Zijlstra
2014-09-24 8:36 ` Peter Zijlstra
2014-10-28 11:11 ` [tip:sched/core] sched, net: Clean up sk_wait_event() vs. might_sleep() tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 10/11] sched: Debug nested sleeps Peter Zijlstra
2014-09-29 22:13 ` Oleg Nesterov
2014-09-30 13:49 ` Peter Zijlstra
2014-09-30 21:47 ` Oleg Nesterov
2014-10-01 16:10 ` Peter Zijlstra
2014-10-01 18:35 ` Oleg Nesterov
2014-10-02 9:07 ` Peter Zijlstra
2014-10-02 21:34 ` Oleg Nesterov
2014-10-28 11:11 ` [tip:sched/core] " tip-bot for Peter Zijlstra
2014-09-24 8:18 ` [PATCH 11/11] sched: Exclude cond_resched() from nested sleep test Peter Zijlstra
2014-10-28 11:12 ` [tip:sched/core] " tip-bot for Peter Zijlstra
2014-09-25 8:30 ` [PATCH 00/11] nested sleeps, fixes and debug infrastructure Mike Galbraith
2014-09-25 9:06 ` Peter Zijlstra
2014-09-25 9:10 ` Mike Galbraith
2014-09-25 9:15 ` Peter Zijlstra
2014-09-25 9:56 ` Mike Galbraith
2014-09-25 13:59 ` BUG: sleeping function called from invalid context at drivers/cpufreq/cpufreq.c:370 Mike Galbraith
2014-09-26 6:24 ` Mike Galbraith
2014-09-26 7:54 ` Mike Galbraith
2014-09-26 14:10 ` Rafael J. Wysocki
2014-09-26 22:44 ` Rafael J. Wysocki
2014-09-27 6:14 ` Mike Galbraith
2014-09-27 19:57 ` Rafael J. Wysocki [this message]
2014-10-02 10:22 ` [PATCH 00/11] nested sleeps, fixes and debug infrastructure Peter Zijlstra
2014-10-02 12:15 ` Peter Zijlstra
2014-10-27 13:41 ` Peter Zijlstra
2014-10-28 0:07 ` Oleg Nesterov
2014-10-28 8:23 ` Peter Zijlstra
2014-10-29 0:00 ` Oleg Nesterov
2014-10-29 9:35 ` Peter Zijlstra
2014-10-29 11:31 ` Peter Zijlstra
2014-10-29 11:36 ` Peter Zijlstra
2014-10-29 14:26 ` Peter Zijlstra
2014-11-04 16:08 ` [tip:sched/core] audit, sched/wait: Fixup kauditd_thread() wait loop tip-bot for Peter Zijlstra
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