BUG: soft lockup detected on CPU#0!
 [<c0441a54>] softlockup_tick+0x96/0xa4
 [<c04092a9>] timer_interrupt+0x504/0x557
 [<c0441c87>] handle_IRQ_event+0x27/0x51
 [<c0441d44>] __do_IRQ+0x93/0xe8
 [<c0406d9b>] do_IRQ+0x93/0xae
 [<c0541911>] evtchn_do_upcall+0x64/0x9b
 [<c0405515>] hypervisor_callback+0x3d/0x48
 [<c045007b>] kswapd_run+0x8/0x69
 [<c05fd078>] _spin_lock+0x7/0xf
 [<c0454760>] unmap_vmas+0x385/0x761
 [<c045919c>] exit_mmap+0x6d/0xe4
 [<c041abd4>] mmput+0x25/0x69
 [<c041b7f3>] copy_process+0xbc3/0x1167
 [<c041bdd8>] do_fork+0x41/0x130
 [<c04031c1>] sys_clone+0x28/0x2d
 [<c040534f>] syscall_call+0x7/0xb
 =======================
BUG: soft lockup detected on CPU#0!
 [<c0441a54>] softlockup_tick+0x96/0xa4
 [<c04092a9>] timer_interrupt+0x504/0x557
 [<c0441c87>] handle_IRQ_event+0x27/0x51
 [<c0441d44>] __do_IRQ+0x93/0xe8
 [<c0406d9b>] do_IRQ+0x93/0xae
 [<c0541911>] evtchn_do_upcall+0x64/0x9b
 [<c0405515>] hypervisor_callback+0x3d/0x48
 [<c045007b>] kswapd_run+0x8/0x69
 [<c05fd076>] _spin_lock+0x5/0xf
 [<c0454760>] unmap_vmas+0x385/0x761
 [<c045919c>] exit_mmap+0x6d/0xe4
 [<c041abd4>] mmput+0x25/0x69
 [<c041b7f3>] copy_process+0xbc3/0x1167
 [<c041bdd8>] do_fork+0x41/0x130
 [<c04031c1>] sys_clone+0x28/0x2d
 [<c040534f>] syscall_call+0x7/0xb
 =======================