crash in tty code in 6.1.. fixed since?

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crash in tty code in 6.1.. fixed since?
\ Julian Elischer (13 Jul 2007)
. \ Hans Petter Selasky (13 Jul 2007)
. \ Hans Petter Selasky (13 Jul 2007)
. . \ Julian Elischer (13 Jul 2007)
. . \ Julian Elischer (13 Jul 2007)
. . . \ Hans Petter Selasky (13 Jul 2007)
. . . \ Hans Petter Selasky (13 Jul 2007)
. \ Attilio Rao (13 Jul 2007)
. . \ Hans Petter Selasky (13 Jul 2007)
. . \ Hans Petter Selasky (13 Jul 2007)
. . . \ Attilio Rao (13 Jul 2007)
. . . \ Attilio Rao (13 Jul 2007)
. . . . \ Hans Petter Selasky (13 Jul 2007)
. . . . \ Hans Petter Selasky (13 Jul 2007)
. . . . . \ Attilio Rao (13 Jul 2007)
. . . . . \ Attilio Rao (13 Jul 2007)
. . . \ LI Xin (13 Jul 2007)
. . . \ LI Xin (13 Jul 2007)
. . . . \ Andrew Thompson (13 Jul 2007)
. . . . \ Hans Petter Selasky (13 Jul 2007)
. . . . \ Hans Petter Selasky (13 Jul 2007)
. . \ Kostik Belousov (13 Jul 2007)
. . . \ Julian Elischer (13 Jul 2007)
. . \ M. Warner Losh (13 Jul 2007)
. . . \ Attilio Rao (13 Jul 2007)

1 msg	uma_zalloc_arg: zone 'mbuf' with the following ...
3 msg	patch to catch non-working hpet
4 msg	Removing an accidentally incorrect vdev from a ...

Subject:	crash in tty code in 6.1.. fixed since?
Group:	Freebsd-current
From:	Julian Elischer
Date:	13 Jul 2007

Does this crash look familiar to anyone?
It's in 6.1 unfortunatly..

#6 0xc069ca6a in calltrap () at ../../../i386/i386/exception.s:139
#7 0xc0587012 in ttymodem (tp=0xc6990800, flag=-1065963704)
at ../../../kern/tty.c:1659
#8 0xc058b83e in ptcclose (dev=0x0, flags=7, fmt=8192, td=0xc6966d80)
at linedisc.h:136
#9 0xc052bf77 in giant_close (dev=0xc7547c00, fflag=7, devtype=8192,
td=0xc6966d80) at ../../../kern/kern_conf.c:266
#10 0xc051685f in devfs_close (ap=0xe706baa4)
at ../../../fs/devfs/devfs_vnops.c:287
#11 0xc06c2a10 in VOP_CLOSE_APV (vop=0x0, a=0xc076af48) at vnode_if.c:426
#12 0xc05bf3ce in vn_close (vp=0xc764e550, flags=7, file_cred=0x0,
td=0xc6966d80) at vnode_if.h:227
#13 0xc05c0212 in vn_closefile (fp=0xc7532510, td=0xc6966d80)
at ../../../kern/vfs_vnops.c:852
#14 0xc0516887 in devfs_close_f (fp=0xc7532510, td=0xc6966d80)
at ../../../fs/devfs/devfs_vnops.c:297
#15 0xc05361e8 in fdrop_locked (fp=0xc7532510, td=0xc6966d80) at file.h:289
#16 0xc0536135 in fdrop (fp=0xc7532510, td=0xc6966d80)
at ../../../kern/kern_descrip.c:2122
#17 0xc05346d3 in closef (fp=0xc7532510, td=0xc6966d80)
at ../../../kern/kern_descrip.c:1942
#18 0xc0533487 in fdfree (td=0xc6966d80) at ../../../kern/kern_descrip.c:1627
#19 0xc053cc88 in exit1 (td=0xc6966d80, rv=15) at ../../../kern/kern_exit.c:263
#20 0xc055b58b in sigexit (td=0xc6966d80, sig=15)
at ../../../kern/kern_sig.c:2451
#21 0xc055b296 in postsig (sig=15) at ../../../kern/kern_sig.c:2326
#22 0xc0577fbe in ast (framep=0xe706bd38) at ../../../kern/subr_trap.c:266
#23 0xc069d3ad in doreti_ast () at ../../../i386/i386/exception.s:293

(kgdb) up
#7 0xc0587012 in ttymodem (tp=0xc6990800, flag=-1065963704)
at ../../../kern/tty.c:1659
1659 if (tp->t_session->s_leader) {
Current language: auto; currently c
(kgdb) list
1654 !ISSET(tp->t_cflag, CLOCAL)) {
1655 SET(tp->t_state, TS_ZOMBIE);
1656 CLR(tp->t_state, TS_CONNECTED);
1657 if (tp->t_session) {
1658 sx_slock(&proctree_lock);
1659 if (tp->t_session->s_leader) {
1660 struct proc *p;
1661
1662 p = tp->t_session->s_leader;
1663 PROC_LOCK(p);

(kgdb) set print pretty
(kgdb) p *tp
$3 = {
t_rawq = {
c_cc = 0,

[...]

t_outcc = 119661,
t_line = 0,
t_dev = 0xc763fe00,
t_mdev = 0x0,
t_devunit = 0,
t_state = 0,
t_flags = 0,
t_timeout = 300000,
t_pgrp = 0x0,
t_session = 0x0,
t_sigio = 0x0,
t_rsel = {
si_thrlist = {
tqe_next = 0x0,
tqe_prev = 0x0
},
si_thread = 0x0,
si_note = {

[...]

tp_session is NULL but it shouldn't have been able to have
run that line (line 1659) if it had tested NULL 2 lines before..
this suggests a locking problem..

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