Eric:
This looks like it's up your alley.
Alan Stern
---------- Forwarded message ----------
Date: Thu, 22 Apr 2010 14:55:33 -0400
From: Dave Jones <davej@xxxxxxxxxx>
To: linux-usb@xxxxxxxxxxxxxxx
Subject: lockdep warning (2.6.33.2)
I plugged in my iphone, and got the spew below..
Dave
=============================================
[ INFO: possible recursive locking detected ]
2.6.33.2-57.fc13.x86_64 #1
---------------------------------------------
udevd/1228 is trying to acquire lock:
(s_active){++++.+}, at: [<ffffffff811785ba>] sysfs_addrm_finish+0x36/0x55
but task is already holding lock:
(s_active){++++.+}, at: [<ffffffff81178776>] sysfs_get_active_two+0x24/0x48
other info that might help us debug this:
4 locks held by udevd/1228:
#0: (&buffer->mutex){+.+.+.}, at: [<ffffffff81177163>] sysfs_write_file+0x3c/0x144
#1: (s_active){++++.+}, at: [<ffffffff81178776>] sysfs_get_active_two+0x24/0x48
#2: (s_active){++++.+}, at: [<ffffffff81178783>] sysfs_get_active_two+0x31/0x48
#3: (&hcd->bandwidth_mutex){+.+...}, at: [<ffffffff8134cd35>] usb_set_configuration+0x260/0x685
stack backtrace:
Pid: 1228, comm: udevd Not tainted 2.6.33.2-57.fc13.x86_64 #1
Call Trace:
[<ffffffff8107f94f>] __lock_acquire+0xcb5/0xd2c
[<ffffffff8107df48>] ? mark_held_locks+0x52/0x70
[<ffffffff8107e329>] ? debug_check_no_locks_freed+0x12e/0x145
[<ffffffff8107e1c8>] ? trace_hardirqs_on_caller+0x111/0x135
[<ffffffff8107faa2>] lock_acquire+0xdc/0x102
[<ffffffff811785ba>] ? sysfs_addrm_finish+0x36/0x55
[<ffffffff8107d300>] ? lockdep_init_map+0x9e/0x113
[<ffffffff81177d8a>] sysfs_deactivate+0x9a/0x103
[<ffffffff811785ba>] ? sysfs_addrm_finish+0x36/0x55
[<ffffffff8107220a>] ? sched_clock_cpu+0xc3/0xce
[<ffffffff81478d6c>] ? __mutex_unlock_slowpath+0x120/0x132
[<ffffffff811785ba>] sysfs_addrm_finish+0x36/0x55
[<ffffffff81176818>] sysfs_hash_and_remove+0x53/0x6a
[<ffffffff811799b1>] sysfs_remove_group+0x91/0xca
[<ffffffff812f2b45>] dpm_sysfs_remove+0x19/0x1b
[<ffffffff812ebbdd>] device_del+0x4c/0x1ab
[<ffffffff812ebd70>] device_unregister+0x34/0x5b
[<ffffffff8135207f>] usb_remove_ep_devs+0x23/0x2f
[<ffffffff8134adb9>] remove_intf_ep_devs+0x37/0x4d
[<ffffffff8134b00b>] usb_disable_device+0xc4/0x1d8
[<ffffffff8134cd62>] usb_set_configuration+0x28d/0x685
[<ffffffff8107df48>] ? mark_held_locks+0x52/0x70
[<ffffffff8147ace1>] ? _raw_spin_unlock_irqrestore+0x47/0x56
[<ffffffff813519ef>] set_bConfigurationValue+0x5e/0x88
[<ffffffff812eaafa>] dev_attr_store+0x20/0x22
[<ffffffff8117722f>] sysfs_write_file+0x108/0x144
[<ffffffff81120199>] vfs_write+0xae/0x10b
[<ffffffff8107e1c8>] ? trace_hardirqs_on_caller+0x111/0x135
[<ffffffff811202b6>] sys_write+0x4a/0x6e
[<ffffffff81009c72>] system_call_fastpath+0x16/0x1b
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