[RELENG_5 panic] Fatal trap 12: page fault while in kernel mode

upon exec'ing xmms.

    kernel trap 12 with interrupts disabled
    Fatal trap 12: page fault while in kernel mode
    fault virtual address   = 0x24
    fault code              = supervisor read, page not present
    instruction pointer     = 0x8:0xc0521eed
    stack pointer           = 0x10:0xe5186c38
    frame pointer           = 0x10:0xe5186c6c
    code segment            = base 0x0, limit 0xfffff, type 0x1b
                            = DPL 0, pres 1, def32 1, gran 1
    processor eflags        = resume, IOPL = 0
    current process         = 35 (swi5: clock sio)
    [thread 100031]
    Stopped at      turnstile_wait+0x269:   movl    0x24(%eax),%eax
    
    db> show pcpu
    cpuid        = 0
    curthread    = 0xc26b8190: pid 35 "swi5: clock sio"
    curpcb       = 0xe5186da0
    fpcurthread  = none
    idlethread   = 0xc26644b0: pid 11 "idle"
    APIC ID      = 0
    currentldt   = 0x28
    db> tr
    turnstile_wait(0,c06f5ec0,c2b334b0,0,e5186cd4) at turnstile_wait+0x269
    _mtx_lock_sleep(c06f5ec0,c26b8190,0,0,0) at _mtx_lock_sleep+0x81
    softclock(0,0,0,0,c0685f86) at softclock+0x3b0
    ithread_loop(c26d0300,e5186d48,e5186d48,c0685c67,31e) at
    ithread_loop+0xb7
    fork_exit(c04e3db0,c26d0300,e5186d48) at fork_exit+0x64
    fork_trampoline() at fork_trampoline+0x8
    --- trap 0x1, eip = 0, esp = 0xe5186d7c, ebp = 0 ---
    db>

 - aW