Re: [Bug 42754] New: BUG: sleeping function called from invalid context at mm/memory.c:3924

On Thu, 2012-02-09 at 19:13 -0800, Andrew Morton wrote:

quoted

[ 1203.050623] BUG: sleeping function called from invalid context at
mm/memory.c:3924
[ 1203.054259] in_atomic(): 1, irqs_disabled(): 0, pid: 4446, name:
NetworkManager
[ 1203.057932] INFO: lockdep is turned off.

This here should have been a listing of all held locks when this
happened, however due to an earlier error lockdep has already been
disabled (means it stops tracking state and printing anything would be
printing nonsense).

This suggests this isn't the first error hit.

quoted

[ 1203.061685] Pid: 4446, comm: NetworkManager Tainted: G        W  O
3.3.0-rc2-t43-devel-smp-00172-g23783f8 #13
[ 1203.065606] Call Trace:
[ 1203.069502]  [<c107e182>] __might_sleep+0x122/0x1d0
[ 1203.073506]  [<c1140b4e>] might_fault+0x2e/0xb0
[ 1203.077501]  [<c131c67b>] copy_to_user+0x3b/0x60
[ 1203.081561]  [<c158a102>] put_cmsg+0x52/0xd0
[ 1203.085624]  [<c15bc7d7>] netlink_recvmsg+0x287/0x340
[ 1203.089740]  [<c1579b43>] sock_recvmsg+0xd3/0x110
[ 1203.093902]  [<c1140b74>] ? might_fault+0x54/0xb0
[ 1203.098093]  [<c158834c>] ? verify_iovec+0x4c/0xc0
[ 1203.102336]  [<c1579a70>] ? sock_sendmsg_nosec+0x100/0x100
[ 1203.106611]  [<c157a994>] __sys_recvmsg+0x114/0x1e0
[ 1203.110942]  [<c1081dc7>] ? finish_task_switch+0x77/0x200
[ 1203.115315]  [<c11784b5>] ? fget_light+0xc5/0x410
[ 1203.119722]  [<c1081dc7>] ? finish_task_switch+0x77/0x200
[ 1203.124167]  [<c11784c9>] ? fget_light+0xd9/0x410
[ 1203.128618]  [<c1178435>] ? fget_light+0x45/0x410
[ 1203.133102]  [<c157c659>] sys_recvmsg+0x39/0x60
[ 1203.137590]  [<c157cbb3>] sys_socketcall+0x2e3/0x330
[ 1203.142147]  [<c17cf58d>] ? sysenter_exit+0xf/0x1a
[ 1203.146707]  [<c131be78>] ? trace_hardirqs_on_thunk+0xc/0x10
[ 1203.151358]  [<c17cf558>] sysenter_do_call+0x12/0x38

Peter, is there any way in which lockdep can help us find the culprit
in the second case?