[Bug] 12.864681 BUG: lock held when returning to user space!

[Madper Xie]

Hi all,
   With kernel3.12-rc2 the dmesg shows following logs:
[   12.864680] ================================================
[   12.864681] [ BUG: lock held when returning to user space! ]
[   12.864682] 3.12.0-rc2 #1 Not tainted
[   12.864683] ------------------------------------------------
[   12.864684] iprinit/719 is leaving the kernel with locks still held!
[   12.864685] 1 lock held by iprinit/719:
[   12.864686]  #0:  (&sdp->o_sem){.+.+..}, at: [<ffffffffa050de05>] sg_open+0x4b5/0x644 [sg]
[   12.934954] ath9k 0000:01:00.0: enabling device (0000 -> 0002)
[   12.940346] ath: phy0: timeout (1000 us) on reg 0x15f18: 0x00000000 & 0x00000007 != 0x00000004
[   12.943125] ath: EEPROM regdomain: 0x60
[   12.943127] ath: EEPROM indicates we should expect a direct regpair map
[   12.943129] ath: Country alpha2 being used: 00
[   12.943130] ath: Regpair used: 0x60
[   12.960202] r8169 0000:02:00.0 p3p1: link down
[   12.960236] r8169 0000:02:00.0 p3p1: link down
[   12.960256] IPv6: ADDRCONF(NETDEV_UP): p3p1: link is not ready
[   13.003523] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[   13.003886] ieee80211 phy0: Atheros AR9485 Rev:1 mem=0xffffc9000bc80000, irq=16
[   13.012120] ip6_tables: (C) 2000-2006 Netfilter Core Team
[   13.023667] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   13.055802] Ebtables v2.0 registered
[   13.192291] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
[   15.906392] r8169 0000:02:00.0 p3p1: link up
[   15.906416] IPv6: ADDRCONF(NETDEV_CHANGE): p3p1: link becomes ready
[   17.121989] systemd-udevd (334) used greatest stack depth: 3352 bytes left

I'm working on finding which version bring this bug in.
-- 
Best,
Madper Xie.
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