7.0-CURRENT (31oct 05) freezes - (ppp and probabl xorg)

[KubaTyszko]

hi.
a few days ago i upgraded to latest -current and after that when i use
ppp connection (any kind inluding rfconn_pppd, pptp, pppoe) when using
Xorg, system hangs after establishing session and agreeing ip addresses.
(when i use ppp in only console - everything works fine).
the same issue occurs with today -CURRENT.
i attached backtrace.
moreover, when u run Xorg by startx it takes some time to start up x -
when i run startx for first time - nothing happens, but after ctrl+c and
startx again it finally does start. - maybe this is all connected.

can anybody help with this ?
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[root at kubal:/usr/obj/usr/src/sys/KUBA:#] kgdb kernel.debug /var/crash/vmcore.0 
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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This GDB was configured as "i386-marcel-freebsd".

Unread portion of the kernel message buffer:
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x5f042f64
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc052b0ee
stack pointer           = 0x28:0xd4440ca4
frame pointer           = 0x28:0xd4440cd0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 12 (swi4: clock sio)
trap number             = 12
panic: page fault
Uptime: 14m50s
Dumping 511 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 511MB (130656 pages) 495 479 463 447 431 415 399 383 367 351 335 319 303 287 271 255 239 223 207 191 175 159 143 127 111 95 79 63 47 31 15

#0  doadump () at pcpu.h:165
165             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) list *0xc052b0ee
0xc052b0ee is in softclock (/usr/src/sys/kern/kern_timeout.c:220).
215                     curticks = softticks;
216                     bucket = &callwheel[curticks & callwheelmask];
217                     c = TAILQ_FIRST(bucket);
218                     while (c) {
219                             depth++;
220                             if (c->c_time != curticks) {
221                                     c = TAILQ_NEXT(c, c_links.tqe);
222                                     ++steps;
223                                     if (steps >= MAX_SOFTCLOCK_STEPS) {
224                                             nextsoftcheck = c;
(kgdb) bt
#0  doadump () at pcpu.h:165
#1  0xc051d62b in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:399
#2  0xc051d8c4 in panic (fmt=0xc06bec49 "%s") at /usr/src/sys/kern/kern_shutdown.c:555
#3  0xc069cc10 in trap_fatal (frame=0xd4440c64, eva=1594109796) at /usr/src/sys/i386/i386/trap.c:855
#4  0xc069c33e in trap (frame=
      {tf_fs = 8, tf_es = -733741016, tf_ds = -1068302296, tf_edi = -1046977280, tf_esi = 4, tf_ebp = -733737776, tf_isp = -733737840, tf_ebx = 1, tf_edx = -874293032, tf_ecx = 1594109788, tf_eax = 889177, tf_trapno = 12, tf_err = 0, tf_eip = -1068322578, tf_cs = 32, tf_eflags = 65538, tf_esp = -1046963968, tf_ss = 0})
    at /usr/src/sys/i386/i386/trap.c:269
#5  0xc068c2ca in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#6  0xc052b0ee in softclock (dummy=0x0) at /usr/src/sys/kern/kern_timeout.c:220
#7  0xc0509421 in ithread_execute_handlers (p=0xc1988890, ie=0xc1986500) at /usr/src/sys/kern/kern_intr.c:662
#8  0xc0509538 in ithread_loop (arg=0xc19705a0) at /usr/src/sys/kern/kern_intr.c:745
#9  0xc0508458 in fork_exit (callout=0xc05094e4 <ithread_loop>, arg=0xc19705a0, frame=0xd4440d38) at /usr/src/sys/kern/kern_fork.c:789
#10 0xc068c32c in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:208
(kgdb) quit
[root at kubal:/usr/obj/usr/src/sys/KUBA:#]