#0 doadump () at pcpu.h:159
#1 0xc04d9efb in boot (howto=260) at ../../../kern/kern_shutdown.c:397
#2 0xc04da221 in panic (fmt=0xc060106c "%s") at
.../../../kern/kern_shutdown.c:553
#3 0xc05dd308 in trap_fatal (frame=0xe83ef980, eva=28) at
.../../../i386/i386/trap.c:809
#4 0xc05dd04b in trap_pfault (frame=0xe83ef980, usermode=0, eva=28) at
.../../../i386/i386/trap.c:727
#5 0xc05dcca5 in trap (frame=
{tf_fs = -1068761064, tf_es = -398589936, tf_ds = 16777232, tf_edi =
-993459960, tf_esi = -1037469184, tf_ebp = -398526004, tf_isp = -398526036,
tf_ebx = -1031939584, tf_edx = 0, tf_ecx = -1037239168, tf_eax = 4,
tf_trapno = 12, tf_err = 2, tf_eip = -1068763929, tf_cs = 8, tf_eflags =
66118, tf_esp = -1031939584, tf_ss = -1037469184})
at ../../../i386/i386/trap.c:417
#6 0xc05cb7da in calltrap () at ../../../i386/i386/exception.s:140
#7 0xc04c0018 in kern_execve (td=0xc2297a00, fname=0x0, argv=0x0,
envv=0xc27dda10, mac_p=0xc27dda00)
at ../../../kern/kern_exec.c:242
#8 0xc05087b1 in ttwakeup (tp=0xc2297a00) at ../../../kern/tty.c:2370
#9 0xc0507414 in ttymodem (tp=0xc27dda00, flag=0) at
.../../../kern/tty.c:1625
#10 0xc050b0ff in ptcopen (dev=0xc2297a00, flag=3, devtype=8192, td=0x0) at
linedisc.h:136
#11 0xc04a231a in spec_open (ap=0xe83efa84) at
.../../../fs/specfs/spec_vnops.c:207
#12 0xc04a205f in spec_vnoperate (ap=0x0) at
.../../../fs/specfs/spec_vnops.c:118
#13 0xc053813d in vn_open_cred (ndp=0xe83efbe4, flagp=0xe83efce4, cmode=0,
cred=0xc3c16980, fdidx=0) at vnode_if.h:228
#14 0xc0537d22 in vn_open (ndp=0x0, flagp=0xe83efce4, cmode=0, fdidx=6) at
.../../../kern/vfs_vnops.c:91
#15 0xc0531e3b in kern_open (td=0xc22cfc80, path=0x0, pathseg=UIO_USERSPACE,
flags=3, mode=0)
at ../../../kern/vfs_syscalls.c:957
#16 0xc0531d54 in open (td=0xc22cfc80, uap=0x0) at
.../../../kern/vfs_syscalls.c:926
#17 0xc05dd613 in syscall (frame=
{tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = -1077943301, tf_esi =
673008685, tf_ebp = -1077943272, tf_isp = -398525068, tf_ebx = 673015904,
tf_edx = 673008700, tf_ecx = 674465260, tf_eax = 5, tf_trapno = 12, tf_err =
2, tf_eip = 673977623, tf_cs = 31, tf_eflags = 662, tf_esp = -1077943364,
tf_ss = 47}) at ../../../i386/i386/trap.c:1001
#18 0xc05cb82f in Xint0x80_syscall () at ../../../i386/i386/exception.s:201
#19 0x0000002f in ?? ()
#20 0x0000002f in ?? ()
#21 0x0000002f in ?? ()
#22 0xbfbfe3fb in ?? ()
#23 0x281d4c2d in ?? ()
#24 0xbfbfe418 in ?? ()
#25 0xe83efd74 in ?? ()
#26 0x281d6860 in ?? ()
#27 0x281d4c3c in ?? ()
#28 0x283385ec in ?? ()
#29 0x00000005 in ?? ()
#30 0x0000000c in ?? ()
#31 0x00000002 in ?? ()
#32 0x282c1517 in ?? ()
#33 0x0000001f in ?? ()
#34 0x00000296 in ?? ()
#35 0xbfbfe3bc in ?? ()
#36 0x0000002f in ?? ()
#37 0x00000000 in ?? ()
#38 0x00000000 in ?? ()
#39 0x00000000 in ?? ()
#40 0x00000000 in ?? ()
#41 0x148e3000 in ?? ()
#42 0xc2831a98 in ?? ()
#43 0xc22cfc80 in ?? ()
#44 0xe83efaac in ?? ()
#45 0xe83efa94 in ?? ()
#46 0xc1e7d4b0 in ?? ()
#47 0xc04ea503 in sched_switch (td=0x281d4c2d, newtd=0x281d6860,
flags=Cannot access memory at address 0xbfbfe428
) at ../../../kern/sched_4bsd.c:865

Panicstring: page fault

uname -pr
5.3-RELEASE-p5 i386

Please advice.