On Tue, 6 Jan 2009, Brandon Weisz wrote:
http://people.freebsd.org/~yongari/fxp/if_fxp.c
http://people.freebsd.org/~yongari/fxp/if_fxpreg.h
http://people.freebsd.org/~yongari/fxp/if_fxpvar.h
With this version, the system still panics as before.
After the system panic with this patch, I went into the bios and disabled
all unnecessary hardware such as parallel port, usb controller and on-board
audio. The resulting panic below appears different.
Without contributing anything too constructive to this conversation, this
crash looks a bit like it might be a device driver bug in which a packet is
passed to if_input() from the device driver, but then modified by the device
driver after it is handed off.
Robert N M Watson
Computer Laboratory
University of Cambridge
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x400
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc07eefec
stack pointer = 0x28:0xe4339ac0
frame pointer = 0x28:0xe4339ae4
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 = 28 (irq23: vr0)
trap number = 12
panic: page fault
cpuid = 0
Uptime: 50s
Physical memory: 995 MB
Dumping 162 MB: 147 131 115 99 83 67 51 35 19 3
....
(kgdb) list *0xc07eefec
0xc07eefec is in sbappendaddr_locked
(/usr/src.local/sys/kern/uipc_sockbuf.c:652).
647 if (n)
648 n->m_next = m0; /* concatenate data to
control */
649 else
650 control = m0;
651 m->m_next = control;
652 for (n = m; n->m_next != NULL; n = n->m_next)
653 sballoc(sb, n);
654 sballoc(sb, n);
655 nlast = n;
656 SBLINKRECORD(sb, m);
(kgdb) bt
#0 doadump () at pcpu.h:196
#1 0xc079cf07 in boot (howto=260) at
/usr/src.local/sys/kern/kern_shutdown.c:418
#2 0xc079d1d9 in panic (fmt=Variable "fmt" is not available.
) at /usr/src.local/sys/kern/kern_shutdown.c:574
#3 0xc0ab110c in trap_fatal (frame=0xe4339a80, eva=1024) at
/usr/src.local/sys/i386/i386/trap.c:939
#4 0xc0ab1390 in trap_pfault (frame=0xe4339a80, usermode=0, eva=1024) at
/usr/src.local/sys/i386/i386/trap.c:852
#5 0xc0ab1d4c in trap (frame=0xe4339a80) at
/usr/src.local/sys/i386/i386/trap.c:530
#6 0xc0a97bbb in calltrap () at /usr/src.local/sys/i386/i386/exception.s:159
#7 0xc07eefec in sbappendaddr_locked (sb=0xc5bacd50, asa=0xe4339b90,
m0=0xc4167000, control=0xc4167000) at
/usr/src.local/sys/kern/uipc_sockbuf.c:652
#8 0xc08ecb71 in udp_append (inp=Variable "inp" is not available.
) at /usr/src.local/sys/netinet/udp_usrreq.c:254
#9 0xc08edf7a in udp_input (m=0xc4167000, off=20) at
/usr/src.local/sys/netinet/udp_usrreq.c:567
#10 0xc087d320 in ip_input (m=0xc4167000) at
/usr/src.local/sys/netinet/ip_input.c:665
#11 0xc0842a85 in netisr_dispatch (num=2, m=0xc4167000) at
/usr/src.local/sys/net/netisr.c:185
#12 0xc08389f1 in ether_demux (ifp=0xc41b6800, m=0xc4167000) at
/usr/src.local/sys/net/if_ethersubr.c:834
#13 0xc0838de3 in ether_input (ifp=0xc41b6800, m=0xc4167000) at
/usr/src.local/sys/net/if_ethersubr.c:692
#14 0xc071750b in vr_intr (arg=0xc41c8000) at
/usr/src.local/sys/dev/vr/if_vr.c:1415
#15 0xc077bf0b in ithread_loop (arg=0xc41c5550) at
/usr/src.local/sys/kern/kern_intr.c:1088
#16 0xc0778a79 in fork_exit (callout=0xc077bd50 <ithread_loop>,
arg=0xc41c5550, frame=0xe4339d38) at /usr/src.local/sys/kern/kern_fork.c:804
#17 0xc0a97c30 in fork_trampoline () at
/usr/src.local/sys/i386/i386/exception.s:264
(kgdb)
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