Alpha Panic in -Current

[csj]

I met a panic today. However, I didn't get a dump. I paste the error =
message here. Someone can take a look? Thanks,

Jun Su

unaligned access fault (from ipl 0)
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
doselwakeup() at doselwakeup+0xb4
selwakeuppri() at selwakeuppri+0x14
ttwwakeup() at ttwwakeup+0x48
comstart() at comstart+0x42c
comparam() at comparam+0x4d8
sioopen() at sioopen+0x2f0
spec_open() at spec_open+0x378
spec_vnoperate() at spec_vnoperate+0x2c
vn_open_cred() at vn_open_cred+0x440
vn_open() at vn_open+0x24
kern_open() at kern_open+0xf0
open() at open+0x28
syscall() at syscall+0x36c
XentSys() at XentSys+0x64

        if (td =3D=3D NULL) {
    2730:       00 00 1d a6     ldq     a0,0(gp)
    2734:       11 04 ff 47     clr     a1
    2738:       00 00 5d a6     ldq     a2,0(gp)
    273c:       be 04 7f 22     lda     a3,1214
    2740:       2a 00 40 e5     beq     s1,27ec <doselwakeup+0x14c>
                mtx_unlock(&sellock);
                return;
        }
        TAILQ_REMOVE(&td->td_selq, sip, si_thrlist);
    2744:       00 00 49 a4     ldq     t1,0(s0)
    2748:       05 00 40 e4     beq     t1,2760 <doselwakeup+0xc0>
    274c:       08 00 29 a4     ldq     t0,8(s0)
    2750:       08 00 22 b4     stq     t0,8(t1)  =
<=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D Panic here
    2754:       04 00 e0 c3     br      2768 <doselwakeup+0xc8>
    2758:       1f 04 ff 47     nop
    275c:       00 00 fe 2f     unop
    2760:       08 00 29 a4     ldq     t0,8(s0)
    2764:       68 00 2a b4     stq     t0,104(s1)
    2768:       08 00 49 a4     ldq     t1,8(s0)
    276c:       00 00 29 a4     ldq     t0,0(s0)
    2770:       00 00 22 b4     stq     t0,0(t1)
        sip->si_thread =3D NULL;
    2774:       10 00 e9 b7     stq     zero,16(s0)
        mtx_lock_spin(&sched_lock);