PANIC: trap.c

Hello,
just only for info
I got this panic on:
FreeBSD 5.2-CURRENT #1: Mon Feb 16 00:53:39 CET 2004

I built few kernels from saturday morning to sunday evening and with all 
of them i got this panic ..
(my last functional kernel is from FreeBSD 5.2-CURRENT #0: Mon Feb  9 
19:53:47 CET 2004)
Jiri


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panic: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x98
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc05726c8
stack pointer           = 0x10:0xcd931b6c
frame pointer           = 0x10:0xcd931c08
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 27 (swi1: net)
trap number             = 12
panic: page fault
at line 819 in file /usr/src/sys/i386/i386/trap.c

syncing disks, buffers remaining... 2228 2228 2228 2228 2228 2228 2228 
2228 2228 2228 2228 2228 2228 2228 2228 ad0: WARNING - WRITE_DMA 
interrupt was seen but timeout fired LBA=16089983
2228 2228 2228 2228 2228
giving up on 1832 buffers
Uptime: 48m58s
Dumping 255 MB
 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
---
Reading symbols from /boot/kernel/acpi.ko...done.
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from 
/usr/obj/usr/src/sys/ROUTER-IPFW-DEBUG/modules/usr/src/sys/modules/linprocfs/linprocfs.ko.debug...done.
Loaded symbols for 
/usr/obj/usr/src/sys/ROUTER-IPFW-DEBUG/modules/usr/src/sys/modules/linprocfs/linprocfs.ko.debug
Reading symbols from 
/usr/obj/usr/src/sys/ROUTER-IPFW-DEBUG/modules/usr/src/sys/modules/linux/linux.ko.debug...done.
Loaded symbols for 
/usr/obj/usr/src/sys/ROUTER-IPFW-DEBUG/modules/usr/src/sys/modules/linux/linux.ko.debug
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
240             dumping++;
(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc04ef695 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:374
#2  0xc04ef963 in __panic () at /usr/src/sys/kern/kern_shutdown.c:552
#3  0xc063ba6c in trap_fatal (frame=0xcd931b2c, eva=152) at 
/usr/src/sys/i386/i386/trap.c:819
#4  0xc063b7a3 in trap_pfault (frame=0xcd931b2c, usermode=0, eva=152) at 
/usr/src/sys/i386/i386/trap.c:733
#5  0xc063b405 in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = -1028936856, tf_esi 
= -1055952304, tf_ebp = -845997048, tf_isp = -845997224, tf_ebx = 0, 
tf_edx = -1055952384, tf_ecx = 0, tf_eax = -1055952384, tf_trapno = 12, 
tf_err = 0, tf_eip = -1068030264, tf_cs = 8, tf_eflags = 66050, tf_esp = 
-1066754656, tf_ss = 64})
    at /usr/src/sys/i386/i386/trap.c:420
#6  0xc05726c8 in ip_output (m=0xc10f7200, opt=0x0, ro=0xc2abab68, 
flags=1, imo=0x0, inp=0x0) at /usr/src/sys/netinet/ip_output.c:983
#7  0xc05719ce in ip_forward (m=0xc10f7200, srcrt=0, next_hop=0x0) at 
/usr/src/sys/netinet/ip_input.c:1868
#8  0xc05705f1 in ip_input (m=0xc10f7200) at 
/usr/src/sys/netinet/ip_input.c:698
#9  0xc05536ea in netisr_processqueue (ni=0xc06f7c18) at 
/usr/src/sys/net/netisr.c:152
#10 0xc0553a5d in swi_net (dummy=0x0) at /usr/src/sys/net/netisr.c:257
#11 0xc04dfd08 in ithread_loop (arg=0xc10dd580) at 
/usr/src/sys/kern/kern_intr.c:547
#12 0xc04df0e0 in fork_exit (callout=0xc04dfbd4 <ithread_loop>, 
arg=0xc10dd580, frame=0xcd931d48) at /usr/src/sys/kern/kern_fork.c:802
(kgdb) up 3
#3  0xc063ba6c in trap_fatal (frame=0xcd931b2c, eva=152) at 
/usr/src/sys/i386/i386/trap.c:819
819                     panic("%s", trap_msg[type]);
(kgdb) up 1
#4  0xc063b7a3 in trap_pfault (frame=0xcd931b2c, usermode=0, eva=152) at 
/usr/src/sys/i386/i386/trap.c:733
733                     trap_fatal(frame, eva);
#5  0xc063b405 in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = -1028936856, tf_esi 
= -1055952304, tf_ebp = -845997048, tf_isp = -845997224, tf_ebx = 0, 
tf_edx = -1055952384, tf_ecx = 0, tf_eax = -1055952384, tf_trapno = 12, 
tf_err = 0, tf_eip = -1068030264, tf_cs = 8, tf_eflags = 66050, tf_esp = 
-1066754656, tf_ss = 64})
    at /usr/src/sys/i386/i386/trap.c:420
420                             (void) trap_pfault(&frame, FALSE, eva);

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