While testing usage of b43legacy as an AP, I got the following in my logs. My
kernel is the latest wireless-testing that was pulled about 2 hours ago -
hostapd is 0.6.8.
Larry
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.29-rc8-wl #89
-------------------------------------------------------
hostapd/6686 is trying to acquire lock:
(rtnl_mutex){--..}, at: [<ffffffff803e45b8>] rtnl_lock+0x12/0x14
but task is already holding lock:
(&drv->mtx){--..}, at: [<ffffffffa01e2a60>]
cfg80211_get_dev_from_info+0x101/0x115 [cfg80211]
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&drv->mtx){--..}:
[<ffffffff8025ed1f>] __lock_acquire+0x12b4/0x161e
[<ffffffff8025f0de>] lock_acquire+0x55/0x71
[<ffffffff804490d2>] mutex_lock_nested+0x111/0x2ae
[<ffffffffa01e293a>] cfg80211_get_dev_from_ifindex+0x65/0x8a [cfg80211]
[<ffffffffa01e4ef5>] cfg80211_wext_giwscan+0x40/0xe8a [cfg80211]
[<ffffffff804382bd>] ioctl_standard_iw_point+0x16d/0x1fc
[<ffffffff804383e1>] ioctl_standard_call+0x95/0xb4
[<ffffffff8043852b>] wext_ioctl_dispatch+0x9a/0x172
[<ffffffff804386ee>] wext_handle_ioctl+0x39/0x6f
[<ffffffff803dd0a8>] dev_ioctl+0x611/0x63a
[<ffffffff803cc9df>] sock_ioctl+0x20e/0x21d
[<ffffffff802bc050>] vfs_ioctl+0x2a/0x78
[<ffffffff802bc509>] do_vfs_ioctl+0x46b/0x4ab
[<ffffffff802bc58b>] sys_ioctl+0x42/0x65
[<ffffffff8020c0db>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
-> #1 (cfg80211_mutex){--..}:
[<ffffffff8025ed1f>] __lock_acquire+0x12b4/0x161e
[<ffffffff8025f0de>] lock_acquire+0x55/0x71
[<ffffffff804490d2>] mutex_lock_nested+0x111/0x2ae
[<ffffffffa01e28ec>] cfg80211_get_dev_from_ifindex+0x17/0x8a [cfg80211]
[<ffffffffa01e4ef5>] cfg80211_wext_giwscan+0x40/0xe8a [cfg80211]
[<ffffffff804382bd>] ioctl_standard_iw_point+0x16d/0x1fc
[<ffffffff804383e1>] ioctl_standard_call+0x95/0xb4
[<ffffffff8043852b>] wext_ioctl_dispatch+0x9a/0x172
[<ffffffff804386ee>] wext_handle_ioctl+0x39/0x6f
[<ffffffff803dd0a8>] dev_ioctl+0x611/0x63a
[<ffffffff803cc9df>] sock_ioctl+0x20e/0x21d
[<ffffffff802bc050>] vfs_ioctl+0x2a/0x78
[<ffffffff802bc509>] do_vfs_ioctl+0x46b/0x4ab
[<ffffffff802bc58b>] sys_ioctl+0x42/0x65
[<ffffffff8020c0db>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
-> #0 (rtnl_mutex){--..}:
[<ffffffff8025e9ee>] __lock_acquire+0xf83/0x161e
[<ffffffff8025f0de>] lock_acquire+0x55/0x71
[<ffffffff804490d2>] mutex_lock_nested+0x111/0x2ae
[<ffffffff803e45b8>] rtnl_lock+0x12/0x14
[<ffffffffa01eac78>] nl80211_new_interface+0xb8/0x18d [cfg80211]
[<ffffffff803ef5be>] genl_rcv_msg+0x19a/0x1bb
[<ffffffff803ee7a2>] netlink_rcv_skb+0x3e/0x90
[<ffffffff803ef414>] genl_rcv+0x29/0x39
[<ffffffff803ee282>] netlink_unicast+0x1fe/0x274
[<ffffffff803ee575>] netlink_sendmsg+0x27d/0x290
[<ffffffff803cd17d>] sock_sendmsg+0xdf/0xf8
[<ffffffff803cd368>] sys_sendmsg+0x1d2/0x23c
[<ffffffff8020c0db>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
other info that might help us debug this:
2 locks held by hostapd/6686:
#0: (genl_mutex){--..}, at: [<ffffffff803ef405>] genl_rcv+0x1a/0x39
#1: (&drv->mtx){--..}, at: [<ffffffffa01e2a60>]
cfg80211_get_dev_from_info+0x101/0x115 [cfg80211]
stack backtrace:
Pid: 6686, comm: hostapd Not tainted 2.6.29-rc8-wl #89
Call Trace:
[<ffffffff8025d685>] print_circular_bug_tail+0xc5/0xd0
[<ffffffff8025e9ee>] __lock_acquire+0xf83/0x161e
[<ffffffffa01e2a60>] ? cfg80211_get_dev_from_info+0x101/0x115 [cfg80211]
[<ffffffff8025f0de>] lock_acquire+0x55/0x71
[<ffffffff803e45b8>] ? rtnl_lock+0x12/0x14
[<ffffffff804490d2>] mutex_lock_nested+0x111/0x2ae
[<ffffffff803e45b8>] ? rtnl_lock+0x12/0x14
[<ffffffff803e45b8>] ? rtnl_lock+0x12/0x14
[<ffffffff803e45b8>] rtnl_lock+0x12/0x14
[<ffffffffa01eac78>] nl80211_new_interface+0xb8/0x18d [cfg80211]
[<ffffffff803eeb6b>] ? validate_nla+0x96/0x141
[<ffffffff803ef5be>] genl_rcv_msg+0x19a/0x1bb
[<ffffffff803ef424>] ? genl_rcv_msg+0x0/0x1bb
[<ffffffff803ee7a2>] netlink_rcv_skb+0x3e/0x90
[<ffffffff803ef414>] genl_rcv+0x29/0x39
[<ffffffff803ee180>] ? netlink_unicast+0xfc/0x274
[<ffffffff803ee282>] netlink_unicast+0x1fe/0x274
[<ffffffff803d4310>] ? __alloc_skb+0x6f/0x131
[<ffffffff803ee575>] netlink_sendmsg+0x27d/0x290
[<ffffffff803cd17d>] sock_sendmsg+0xdf/0xf8
[<ffffffff8024f1c4>] ? autoremove_wake_function+0x0/0x38
[<ffffffff8044acf0>] ? _spin_unlock_irqrestore+0x3f/0x47
[<ffffffff803cdb68>] ? move_addr_to_kernel+0x40/0x49
[<ffffffff803d5502>] ? verify_iovec+0x4f/0x91
[<ffffffff803cd368>] sys_sendmsg+0x1d2/0x23c
[<ffffffff802be90d>] ? __d_free+0x55/0x59
[<ffffffff802be943>] ? d_free+0x32/0x4c
[<ffffffff802c5577>] ? mntput_no_expire+0x2a/0x13d
[<ffffffff802b1012>] ? __fput+0x19c/0x1a9
[<ffffffff8025d14b>] ? trace_hardirqs_on_caller+0x114/0x138
[<ffffffff8044a8cc>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff8032ac62>] ? __up_read+0x1c/0x9a
[<ffffffff8020c0db>] system_call_fastpath+0x16/0x1b
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