From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Locking bug in 3.0.25, IPv6. Date: Mon, 26 Mar 2012 09:51:54 -0700 Message-ID: <4F709EAA.6040700@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: netdev Return-path: Received: from mail.candelatech.com ([208.74.158.172]:33320 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932969Ab2CZQvy (ORCPT ); Mon, 26 Mar 2012 12:51:54 -0400 Received: from [192.168.100.111] (firewall.candelatech.com [70.89.124.249]) (authenticated bits=0) by ns3.lanforge.com (8.14.2/8.14.2) with ESMTP id q2QGpsjt014699 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 26 Mar 2012 09:51:54 -0700 Sender: netdev-owner@vger.kernel.org List-ID: Has anyone seen this in 3.0.25? My kernel has some other patches applied, but we did not see this before 3.0.24. BUG: sleeping function called from invalid context at /home/greearb/git/linux-3.0.dev.y/mm/memory.c:3904 ================================================ [ BUG: lock held when returning to user space! ] ------------------------------------------------ ip/6696 is leaving the kernel with locks still held! 1 lock held by ip/6696: #0: (rcu_read_lock){.+.+..}, at: [] rcu_read_lock+0x0/0x35 [ipv6] in_atomic(): 0, irqs_disabled(): 0, pid: 6694, name: ip INFO: lockdep is turned off. Pid: 6694, comm: ip Tainted: G C 3.0.25+ #1 Call Trace: [] __might_sleep+0x111/0x115 [] might_fault+0x2f/0x9e [] ? copy_from_user+0x2a/0x2c [] ? might_fault+0x4e/0x9e [] move_addr_to_user+0x21/0x8e [] __sys_recvmsg+0x17f/0x21e [] ? up_read+0x1e/0x36 [] ? fcheck_files+0xb7/0xee [] ? fget_light+0x35/0xac [] ? remove_vma+0x7a/0x82 [] sys_recvmsg+0x3d/0x5b [] system_call_fastpath+0x16/0x1b -- Ben Greear Candela Technologies Inc http://www.candelatech.com