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Date: Sun, 31 Mar 2013 03:41:11 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Sasha Levin <sasha.levin@...cle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tejun Heo <tj@...nel.org>, Dave Jones <davej@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: gpf in pm_qos_remote_wakeup_show
[Moving the thread to the LKML.]
On Saturday, March 30, 2013 06:41:16 PM Sasha Levin wrote:
> On 03/15/2013 01:06 PM, Rafael J. Wysocki wrote:
[...]
> >> Rafael, Is there anything you would like me to test?
> >
> > Please just test 3.9-rc2 (or later).
>
> Hi Rafael,
Hi,
> I got this after a bit of fuzzing, it looks related to the fix:
So the complaint is that we shouldn't call pm_qos_sysfs_remove_flags() under
dev_pm_qos_mtx, because then it may deadlock with dev_pm_qos_update_flags()
called from pm_qos_remote_wakeup_store(), for example. This appears to be a
valid one.
To avoid that, we can use a separate mutex for exposing/hiding the flags
(and the latency limit too) that won't be acquired by dev_pm_qos_update_flags()
or dev_pm_qos_update_request().
Can you please try the patch below?
Rafael
>
> [ 241.995620] ======================================================
> [ 241.999545] [ INFO: possible circular locking dependency detected ]
> [ 242.000021] 3.9.0-rc4-next-20130328-sasha-00014-g91a3267 #319 Tainted: G W
> [ 242.000021] -------------------------------------------------------
> [ 242.000021] trinity-child6/12371 is trying to acquire lock:
> [ 242.000021] (s_active#54){++++.+}, at: [<ffffffff81301631>] sysfs_addrm_finish+0x31/0x60
> [ 242.000021]
> [ 242.000021] but task is already holding lock:
> [ 242.000021] (dev_pm_qos_mtx){+.+.+.}, at: [<ffffffff81f07cc3>] dev_pm_qos_constraints_destroy+0x23/0x250
> [ 242.000021]
> [ 242.000021] which lock already depends on the new lock.
> [ 242.000021]
> [ 242.000021]
> [ 242.000021] the existing dependency chain (in reverse order) is:
> [ 242.000021]
> -> #1 (dev_pm_qos_mtx){+.+.+.}:
> [ 242.000021] [<ffffffff811811da>] lock_acquire+0x1aa/0x240
> [ 242.000021] [<ffffffff83dab809>] __mutex_lock_common+0x59/0x5e0
> [ 242.000021] [<ffffffff83dabebf>] mutex_lock_nested+0x3f/0x50
> [ 242.000021] [<ffffffff81f07f2f>] dev_pm_qos_update_flags+0x3f/0xc0
> [ 242.000021] [<ffffffff81f05f4f>] pm_qos_remote_wakeup_store+0x3f/0x70
> [ 242.000021] [<ffffffff81efbb43>] dev_attr_store+0x13/0x20
> [ 242.000021] [<ffffffff812ffdaa>] sysfs_write_file+0xfa/0x150
> [ 242.000021] [<ffffffff8127f2c1>] __kernel_write+0x81/0x150
> [ 242.000021] [<ffffffff812afc2d>] write_pipe_buf+0x4d/0x80
> [ 242.000021] [<ffffffff812af57c>] splice_from_pipe_feed+0x7c/0x120
> [ 242.000021] [<ffffffff812afa25>] __splice_from_pipe+0x45/0x80
> [ 242.000021] [<ffffffff812b14fc>] splice_from_pipe+0x4c/0x70
> [ 242.000021] [<ffffffff812b1538>] default_file_splice_write+0x18/0x30
> [ 242.000021] [<ffffffff812afae3>] do_splice_from+0x83/0xb0
> [ 242.000021] [<ffffffff812afb2e>] direct_splice_actor+0x1e/0x20
> [ 242.000021] [<ffffffff812b0277>] splice_direct_to_actor+0xe7/0x200
> [ 242.000021] [<ffffffff812b15bc>] do_splice_direct+0x4c/0x70
> [ 242.038959] [<ffffffff8127eda9>] do_sendfile+0x169/0x300
> [ 242.038959] [<ffffffff8127ff94>] SyS_sendfile64+0x64/0xb0
> [ 242.038959] [<ffffffff83db7d18>] tracesys+0xe1/0xe6
> [ 242.038959]
> -> #0 (s_active#54){++++.+}:
> [ 242.038959] [<ffffffff811800cf>] __lock_acquire+0x15bf/0x1e50
> [ 242.038959] [<ffffffff811811da>] lock_acquire+0x1aa/0x240
> [ 242.038959] [<ffffffff81300aa2>] sysfs_deactivate+0x122/0x1a0
> [ 242.038959] [<ffffffff81301631>] sysfs_addrm_finish+0x31/0x60
> [ 242.038959] [<ffffffff812ff77f>] sysfs_hash_and_remove+0x7f/0xb0
> [ 242.038959] [<ffffffff813035a1>] sysfs_unmerge_group+0x51/0x70
> [ 242.038959] [<ffffffff81f068f4>] pm_qos_sysfs_remove_flags+0x14/0x20
> [ 242.038959] [<ffffffff81f07490>] __dev_pm_qos_hide_flags+0x30/0x70
> [ 242.038959] [<ffffffff81f07cd5>] dev_pm_qos_constraints_destroy+0x35/0x250
> [ 242.038959] [<ffffffff81f06931>] dpm_sysfs_remove+0x11/0x50
> [ 242.038959] [<ffffffff81efcf6f>] device_del+0x3f/0x1b0
> [ 242.038959] [<ffffffff81efd128>] device_unregister+0x48/0x60
> [ 242.038959] [<ffffffff82d4083c>] usb_hub_remove_port_device+0x1c/0x20
> [ 242.038959] [<ffffffff82d2a9cd>] hub_disconnect+0xdd/0x160
> [ 242.038959] [<ffffffff82d36ab7>] usb_unbind_interface+0x67/0x170
> [ 242.038959] [<ffffffff81f001a7>] __device_release_driver+0x87/0xe0
> [ 242.038959] [<ffffffff81f00559>] device_release_driver+0x29/0x40
> [ 242.038959] [<ffffffff81effc58>] bus_remove_device+0x148/0x160
> [ 242.038959] [<ffffffff81efd07f>] device_del+0x14f/0x1b0
> [ 242.038959] [<ffffffff82d344f9>] usb_disable_device+0xf9/0x280
> [ 242.038959] [<ffffffff82d34ff8>] usb_set_configuration+0x268/0x840
> [ 242.038959] [<ffffffff82d3a7fc>] usb_remove_store+0x4c/0x80
> [ 242.038959] [<ffffffff81efbb43>] dev_attr_store+0x13/0x20
> [ 242.038959] [<ffffffff812ffdaa>] sysfs_write_file+0xfa/0x150
> [ 242.038959] [<ffffffff8127f71d>] do_loop_readv_writev+0x4d/0x90
> [ 242.038959] [<ffffffff8127f999>] do_readv_writev+0xf9/0x1e0
> [ 242.038959] [<ffffffff8127faba>] vfs_writev+0x3a/0x60
> [ 242.038959] [<ffffffff8127fc60>] SyS_writev+0x50/0xd0
> [ 242.038959] [<ffffffff83db7d18>] tracesys+0xe1/0xe6
> [ 242.038959]
> [ 242.038959] other info that might help us debug this:
> [ 242.038959]
> [ 242.038959] Possible unsafe locking scenario:
> [ 242.038959]
> [ 242.038959] CPU0 CPU1
> [ 242.038959] ---- ----
> [ 242.038959] lock(dev_pm_qos_mtx);
> [ 242.038959] lock(s_active#54);
> [ 242.038959] lock(dev_pm_qos_mtx);
> [ 242.038959] lock(s_active#54);
> [ 242.038959]
> [ 242.038959] *** DEADLOCK ***
> [ 242.038959]
> [ 242.038959] 4 locks held by trinity-child6/12371:
> [ 242.038959] #0: (&buffer->mutex){+.+.+.}, at: [<ffffffff812ffcf3>] sysfs_write_file+0x43/0x150
> [ 242.038959] #1: (&__lockdep_no_validate__){......}, at: [<ffffffff82d3a7d8>] usb_remove_store+0x28/0x80
> [ 242.038959] #2: (&__lockdep_no_validate__){......}, at: [<ffffffff81f00551>] device_release_driver+0x21/0x40
> [ 242.038959] #3: (dev_pm_qos_mtx){+.+.+.}, at: [<ffffffff81f07cc3>] dev_pm_qos_constraints_destroy+0x23/0x250
> [ 242.038959]
> [ 242.038959] stack backtrace:
> [ 242.038959] Pid: 12371, comm: trinity-child6 Tainted: G W 3.9.0-rc4-next-20130328-sasha-00014-g91a3267 #319
> [ 242.038959] Call Trace:
> [ 242.038959] [<ffffffff83d6551c>] print_circular_bug+0x1fb/0x20c
> [ 242.038959] [<ffffffff811800cf>] __lock_acquire+0x15bf/0x1e50
> [ 242.038959] [<ffffffff8117cf45>] ? debug_check_no_locks_freed+0x175/0x1d0
> [ 242.038959] [<ffffffff811811da>] lock_acquire+0x1aa/0x240
> [ 242.038959] [<ffffffff81301631>] ? sysfs_addrm_finish+0x31/0x60
> [ 242.038959] [<ffffffff81300aa2>] sysfs_deactivate+0x122/0x1a0
> [ 242.038959] [<ffffffff81301631>] ? sysfs_addrm_finish+0x31/0x60
> [ 242.038959] [<ffffffff811500e8>] ? sched_clock_cpu+0xf8/0x110
> [ 242.038959] [<ffffffff83dac0d9>] ? mutex_unlock+0x9/0x10
> [ 242.038959] [<ffffffff83dac0d9>] ? mutex_unlock+0x9/0x10
> [ 242.038959] [<ffffffff81301631>] sysfs_addrm_finish+0x31/0x60
> [ 242.038959] [<ffffffff812ff77f>] sysfs_hash_and_remove+0x7f/0xb0
> [ 242.038959] [<ffffffff813035a1>] sysfs_unmerge_group+0x51/0x70
> [ 242.038959] [<ffffffff81f068f4>] pm_qos_sysfs_remove_flags+0x14/0x20
> [ 242.038959] [<ffffffff81f07490>] __dev_pm_qos_hide_flags+0x30/0x70
> [ 242.038959] [<ffffffff81f07cd5>] dev_pm_qos_constraints_destroy+0x35/0x250
> [ 242.038959] [<ffffffff81f06931>] dpm_sysfs_remove+0x11/0x50
> [ 242.038959] [<ffffffff83daf46b>] ? _raw_spin_unlock_irq+0x2b/0x80
> [ 242.038959] [<ffffffff81efcf6f>] device_del+0x3f/0x1b0
> [ 242.038959] [<ffffffff81efd128>] device_unregister+0x48/0x60
> [ 242.038959] [<ffffffff82d4083c>] usb_hub_remove_port_device+0x1c/0x20
> [ 242.038959] [<ffffffff82d2a9cd>] hub_disconnect+0xdd/0x160
> [ 242.038959] [<ffffffff82d36ab7>] usb_unbind_interface+0x67/0x170
> [ 242.038959] [<ffffffff81f001a7>] __device_release_driver+0x87/0xe0
> [ 242.038959] [<ffffffff81f00559>] device_release_driver+0x29/0x40
> [ 242.038959] [<ffffffff81effc58>] bus_remove_device+0x148/0x160
> [ 242.038959] [<ffffffff81efd07f>] device_del+0x14f/0x1b0
> [ 242.038959] [<ffffffff82d344f9>] usb_disable_device+0xf9/0x280
> [ 242.038959] [<ffffffff82d34ff8>] usb_set_configuration+0x268/0x840
> [ 242.038959] [<ffffffff8117dc1a>] ? __lock_is_held+0x5a/0x80
> [ 242.038959] [<ffffffff82d3a7d8>] ? usb_remove_store+0x28/0x80
> [ 242.038959] [<ffffffff82d3a7fc>] usb_remove_store+0x4c/0x80
> [ 242.038959] [<ffffffff81efbb43>] dev_attr_store+0x13/0x20
> [ 242.038959] [<ffffffff812ffdaa>] sysfs_write_file+0xfa/0x150
> [ 242.038959] [<ffffffff812ffcb0>] ? sysfs_chmod_file+0xb0/0xb0
> [ 242.038959] [<ffffffff8127f71d>] do_loop_readv_writev+0x4d/0x90
> [ 242.038959] [<ffffffff8127f999>] do_readv_writev+0xf9/0x1e0
> [ 242.038959] [<ffffffff83daf46b>] ? _raw_spin_unlock_irq+0x2b/0x80
> [ 242.038959] [<ffffffff8127faba>] vfs_writev+0x3a/0x60
> [ 242.038959] [<ffffffff8127fc60>] SyS_writev+0x50/0xd0
> [ 242.038959] [<ffffffff83db7d18>] tracesys+0xe1/0xe6
---
drivers/base/power/qos.c | 60 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 47 insertions(+), 13 deletions(-)
Index: linux-pm/drivers/base/power/qos.c
===================================================================
--- linux-pm.orig/drivers/base/power/qos.c
+++ linux-pm/drivers/base/power/qos.c
@@ -46,6 +46,7 @@
#include "power.h"
static DEFINE_MUTEX(dev_pm_qos_mtx);
+static DEFINE_MUTEX(dev_pm_qos_sysfs_mtx);
static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers);
@@ -216,12 +217,17 @@ void dev_pm_qos_constraints_destroy(stru
struct pm_qos_constraints *c;
struct pm_qos_flags *f;
- mutex_lock(&dev_pm_qos_mtx);
+ mutex_lock(&dev_pm_qos_sysfs_mtx);
/*
* If the device's PM QoS resume latency limit or PM QoS flags have been
* exposed to user space, they have to be hidden at this point.
*/
+ pm_qos_sysfs_remove_latency(dev);
+ pm_qos_sysfs_remove_flags(dev);
+
+ mutex_lock(&dev_pm_qos_mtx);
+
__dev_pm_qos_hide_latency_limit(dev);
__dev_pm_qos_hide_flags(dev);
@@ -254,6 +260,8 @@ void dev_pm_qos_constraints_destroy(stru
out:
mutex_unlock(&dev_pm_qos_mtx);
+
+ mutex_unlock(&dev_pm_qos_sysfs_mtx);
}
/**
@@ -558,6 +566,14 @@ static void __dev_pm_qos_drop_user_reque
kfree(req);
}
+static void dev_pm_qos_drop_user_request(struct device *dev,
+ enum dev_pm_qos_req_type type)
+{
+ mutex_lock(&dev_pm_qos_mtx);
+ __dev_pm_qos_drop_user_request(dev, type);
+ mutex_unlock(&dev_pm_qos_mtx);
+}
+
/**
* dev_pm_qos_expose_latency_limit - Expose PM QoS latency limit to user space.
* @dev: Device whose PM QoS latency limit is to be exposed to user space.
@@ -581,6 +597,8 @@ int dev_pm_qos_expose_latency_limit(stru
return ret;
}
+ mutex_lock(&dev_pm_qos_sysfs_mtx);
+
mutex_lock(&dev_pm_qos_mtx);
if (IS_ERR_OR_NULL(dev->power.qos))
@@ -591,26 +609,27 @@ int dev_pm_qos_expose_latency_limit(stru
if (ret < 0) {
__dev_pm_qos_remove_request(req);
kfree(req);
+ mutex_unlock(&dev_pm_qos_mtx);
goto out;
}
-
dev->power.qos->latency_req = req;
+
+ mutex_unlock(&dev_pm_qos_mtx);
+
ret = pm_qos_sysfs_add_latency(dev);
if (ret)
- __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);
+ dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);
out:
- mutex_unlock(&dev_pm_qos_mtx);
+ mutex_unlock(&dev_pm_qos_sysfs_mtx);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit);
static void __dev_pm_qos_hide_latency_limit(struct device *dev)
{
- if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->latency_req) {
- pm_qos_sysfs_remove_latency(dev);
+ if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->latency_req)
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);
- }
}
/**
@@ -619,9 +638,15 @@ static void __dev_pm_qos_hide_latency_li
*/
void dev_pm_qos_hide_latency_limit(struct device *dev)
{
+ mutex_lock(&dev_pm_qos_sysfs_mtx);
+
+ pm_qos_sysfs_remove_latency(dev);
+
mutex_lock(&dev_pm_qos_mtx);
__dev_pm_qos_hide_latency_limit(dev);
mutex_unlock(&dev_pm_qos_mtx);
+
+ mutex_unlock(&dev_pm_qos_sysfs_mtx);
}
EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit);
@@ -649,6 +674,8 @@ int dev_pm_qos_expose_flags(struct devic
}
pm_runtime_get_sync(dev);
+ mutex_lock(&dev_pm_qos_sysfs_mtx);
+
mutex_lock(&dev_pm_qos_mtx);
if (IS_ERR_OR_NULL(dev->power.qos))
@@ -659,16 +686,19 @@ int dev_pm_qos_expose_flags(struct devic
if (ret < 0) {
__dev_pm_qos_remove_request(req);
kfree(req);
+ mutex_unlock(&dev_pm_qos_mtx);
goto out;
}
-
dev->power.qos->flags_req = req;
+
+ mutex_unlock(&dev_pm_qos_mtx);
+
ret = pm_qos_sysfs_add_flags(dev);
if (ret)
- __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);
+ dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);
out:
- mutex_unlock(&dev_pm_qos_mtx);
+ mutex_unlock(&dev_pm_qos_sysfs_mtx);
pm_runtime_put(dev);
return ret;
}
@@ -676,10 +706,8 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_flag
static void __dev_pm_qos_hide_flags(struct device *dev)
{
- if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->flags_req) {
- pm_qos_sysfs_remove_flags(dev);
+ if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->flags_req)
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);
- }
}
/**
@@ -689,9 +717,15 @@ static void __dev_pm_qos_hide_flags(stru
void dev_pm_qos_hide_flags(struct device *dev)
{
pm_runtime_get_sync(dev);
+ mutex_lock(&dev_pm_qos_sysfs_mtx);
+
+ pm_qos_sysfs_remove_flags(dev);
+
mutex_lock(&dev_pm_qos_mtx);
__dev_pm_qos_hide_flags(dev);
mutex_unlock(&dev_pm_qos_mtx);
+
+ mutex_unlock(&dev_pm_qos_sysfs_mtx);
pm_runtime_put(dev);
}
EXPORT_SYMBOL_GPL(dev_pm_qos_hide_flags);
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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