Hello, Ingo! I am seeing the following calltrace every day I am connecting to my test host by the gnome-panel: ssh -Y test.host gnome-terminal BUG: sleeping function called from invalid context at /home/den/src/linux-netns26/kernel/mutex.c:209 in_atomic():1, irqs_disabled():0 no locks held by swapper/0. Pid: 0, comm: swapper Not tainted 2.6.24 #304 Call Trace: [] ? __debug_show_held_locks+0x15/0x27 [] __might_sleep+0xc0/0xdf [] mutex_lock_nested+0x28/0x2a9 [] sched_destroy_group+0x18/0xea [] sched_destroy_user+0xd/0xf [] free_uid+0x8a/0xab [] __put_task_struct+0x3f/0xd3 [] delayed_put_task_struct+0x23/0x25 [] __rcu_process_callbacks+0x8d/0x215 [] rcu_process_callbacks+0x23/0x44 [] __do_softirq+0x79/0xf8 [] ? profile_pc+0x2a/0x67 [] call_softirq+0x1c/0x30 [] do_softirq+0x61/0x9c [] irq_exit+0x51/0x53 [] smp_apic_timer_interrupt+0x77/0xad [] apic_timer_interrupt+0x6b/0x70 [] ? default_idle+0x43/0x76 [] ? default_idle+0x41/0x76 [] ? default_idle+0x0/0x76 [] ? cpu_idle+0x76/0x98 Config is attached. The kernel is today pulled Dave Miller's tree. Regards, Den