Panic in RELENG_7_1 with fxp(4)

Sun Jan 4 01:33:24 UTC 2009

After running 7-PRERELEASE from around November 25th, I upgraded today 
to find the system panics repeatably on RELENG_7_1 sources.  I can boot 
back to the old kernel and it operates as expected.  It seems to be 
related to fxp(4).

FreeBSD didy.internal 7.1-RELEASE FreeBSD 7.1-RELEASE #0: Sat Jan  3
18:11:18 CST 2009     bweisz at didy.internal:/usr/obj/usr/src/sys/DIDY  i386

(19:00:35 bweisz at didy </usr/obj/usr/src/sys/DIDY>) 507 $ sudo kgdb 
kernel.debug /var/crash/vmcore.2
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This GDB was configured as "i386-marcel-freebsd"...

Unread portion of the kernel message buffer:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address	= 0x40c
fault code		= supervisor read, page not present
instruction pointer	= 0x20:0xc0a94510
stack pointer	        = 0x28:0xe677b878
frame pointer	        = 0x28:0xe677b88c
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		= 843 (ntpd)
trap number		= 12
panic: page fault
cpuid = 0
Uptime: 25s
Physical memory: 995 MB
Dumping 94 MB: 79 63 47 31 15

Reading symbols from /boot/kernel/vesa.ko...Reading symbols from 
/boot/kernel/vesa.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/vesa.ko
Reading symbols from /boot/kernel/accf_http.ko...Reading symbols from 
/boot/kernel/accf_http.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/accf_http.ko
Reading symbols from /boot/kernel/acpi.ko...Reading symbols from 
/boot/kernel/acpi.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from /boot/kernel/pflog.ko...Reading symbols from 
/boot/kernel/pflog.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/pflog.ko
Reading symbols from /boot/kernel/pf.ko...Reading symbols from 
/boot/kernel/pf.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/pf.ko
Reading symbols from /boot/kernel/nullfs.ko...Reading symbols from 
/boot/kernel/nullfs.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/nullfs.ko
Reading symbols from /boot/kernel/logo_saver.ko...Reading symbols from 
/boot/kernel/logo_saver.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/logo_saver.ko
#0  doadump () at pcpu.h:196
196		__asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) list *0xc0a94510
0xc0a94510 is in _bus_dmamap_sync 
(/usr/src/sys/i386/i386/busdma_machdep.c:935).
930			CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x op 0x%x "
931			    "performing bounce", __func__, op, dmat, dmat->flags);
932	
933			if (op & BUS_DMASYNC_PREWRITE) {
934				while (bpage != NULL) {
935					bcopy((void *)bpage->datavaddr,
936					      (void *)bpage->vaddr,
937					      bpage->datacount);
938					bpage = STAILQ_NEXT(bpage, links);
939				}
(kgdb) bt
#0  doadump () at pcpu.h:196
#1  0xc079c1b7 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0xc079c489 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3  0xc0ab03bc in trap_fatal (frame=0xe677b838, eva=1036) at 
/usr/src/sys/i386/i386/trap.c:939
#4  0xc0ab0640 in trap_pfault (frame=0xe677b838, usermode=0, eva=1036) 
at /usr/src/sys/i386/i386/trap.c:852
#5  0xc0ab0ffc in trap (frame=0xe677b838) at 
/usr/src/sys/i386/i386/trap.c:530
#6  0xc0a96e6b in calltrap () at /usr/src/sys/i386/i386/exception.s:159
#7  0xc0a94510 in _bus_dmamap_sync (dmat=0xc4048880, map=0xc416e800, 
op=4) at /usr/src/sys/i386/i386/busdma_machdep.c:933
#8  0xc05cc3cd in fxp_start_body (ifp=0xc4163000) at 
/usr/src/sys/dev/fxp/if_fxp.c:1396
#9  0xc05ccc77 in fxp_start (ifp=0xc4163000) at 
/usr/src/sys/dev/fxp/if_fxp.c:1183
#10 0xc0830a89 in if_start (ifp=0xc4163000) at /usr/src/sys/net/if.c:2768
#11 0xc08374cb in ether_output_frame (ifp=0xc4163000, m=0xc43a5600) at 
/usr/src/sys/net/if_ethersubr.c:405
#12 0xc0837a7c in ether_output (ifp=0xc4163000, m=0xc43a5600, 
dst=0xc423b710, rt0=0xc4489364) at /usr/src/sys/net/if_ethersubr.c:374
#13 0xc087e115 in ip_output (m=0xc43a5600, opt=0x0, ro=0xe677bac4, 
flags=Variable "flags" is not available.
) at /usr/src/sys/netinet/ip_output.c:554
#14 0xc08eb9b9 in udp_send (so=0xc46ef9c0, flags=0, m=0xc43a5600, 
addr=0xc4462ab0, control=0x0, td=0xc421f230) at 
/usr/src/sys/netinet/udp_usrreq.c:1074
#15 0xc07f2546 in sosend_dgram (so=0xc46ef9c0, addr=0xc4462ab0, 
uio=0xe677bbe8, top=0xc43a5600, control=0x0, flags=Variable "flags" is 
not available.
) at /usr/src/sys/kern/uipc_socket.c:1059
#16 0xc07efbef in sosend (so=0xc46ef9c0, addr=0xc4462ab0, 
uio=0xe677bbe8, top=0x0, control=0x0, flags=0, td=0xc421f230) at 
/usr/src/sys/kern/uipc_socket.c:1288
#17 0xc07f6ef6 in kern_sendit (td=0xc421f230, s=23, mp=0xe677bc64, 
flags=0, control=0x0, segflg=UIO_USERSPACE) at 
/usr/src/sys/kern/uipc_syscalls.c:805
#18 0xc07fa141 in sendit (td=0xc421f230, s=23, mp=0xe677bc64, flags=0) 
at /usr/src/sys/kern/uipc_syscalls.c:742
#19 0xc07fa258 in sendto (td=0xc421f230, uap=0xe677bcfc) at 
/usr/src/sys/kern/uipc_syscalls.c:857
#20 0xc0ab0995 in syscall (frame=0xe677bd38) at 
/usr/src/sys/i386/i386/trap.c:1090
#21 0xc0a96ed0 in Xint0x80_syscall () at 
/usr/src/sys/i386/i386/exception.s:255
#22 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)

I replaced the fxp(4) card with an old xl(4) card lying on my desk and 
the panics stopped.  Is this a failing nic card or some other trigger?

Brandon