here's a new crash related to security changes - a boot lockup on a 
testbox:

Pid: 5, comm: events/0 Tainted: G        W  (2.6.31-tip-02301-g1c11bd7-dirty #13102) System Product Name
EIP: 0060:[<c104ad77>] EFLAGS: 00000046 CPU: 0
EIP is at trace_hardirqs_off_caller+0x30/0x9a
EAX: 00000002 EBX: f70431c0 ECX: c18c8e58 EDX: c10138ce
ESI: c10138ce EDI: 00000002 EBP: f7051ddc ESP: f7051dd4
 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
CR0: 8005003b CR2: b745e530 CR3: 3618f000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: c210fa6c
DR6: ffff0ff0 DR7: 00000400
Call Trace:
 [<c104adec>] trace_hardirqs_off+0xb/0xd
 [<c10138ce>] default_send_IPI_mask_logical+0xd2/0xe3
 [<c1013759>] default_send_IPI_all+0x27/0x67
 [<c1013a97>] arch_trigger_all_cpu_backtrace+0x30/0x54
 [<c1060c46>] __rcu_pending+0x49/0x113
 [<c1060d2d>] rcu_check_callbacks+0x1d/0x9c
 [<c103390c>] update_process_times+0x29/0x3e
 [<c104713c>] tick_periodic+0x6a/0x6c
 [<c1047152>] tick_handle_periodic+0x14/0x6a
 [<c1013463>] smp_apic_timer_interrupt+0x63/0x73
 [<c100302f>] apic_timer_interrupt+0x2f/0x40
 [<c15fdaaa>] ? _spin_unlock_irqrestore+0x3d/0x41
 [<c103a685>] __queue_work+0x2b/0x30
 [<c103a6d1>] queue_work_on+0x2c/0x36
 [<c103a7b2>] queue_work+0x13/0x15
 [<c103a7c8>] schedule_work+0x14/0x16
 [<c125178a>] key_schedule_gc+0x28/0x4e
 [<c1251917>] key_garbage_collector+0x167/0x180
 [<c103a004>] run_workqueue+0xfb/0x1c4
 [<c1039fe5>] ? run_workqueue+0xdc/0x1c4
 [<c12517b0>] ? key_garbage_collector+0x0/0x180
 [<c103a146>] worker_thread+0x79/0x85
 [<c103d3e3>] ? autoremove_wake_function+0x0/0x38
 [<c103a0cd>] ? worker_thread+0x0/0x85
 [<c103d1d2>] kthread+0x65/0x6a
 [<c103d16d>] ? kthread+0x0/0x6a
 [<c1003267>] kernel_thread_helper+0x7/0x10
Pid: 5, comm: events/0 Tainted: G        W  2.6.31-tip-02301-g1c11bd7-dirty #13102

config and bootlog attached.

	Ingo