Julian Elischer wrote:
#10 0xc0978200 in rt_dispatch (m=0xc764ad00, sa=0x0) at /usr/src/sys/net/rtsock.c:1374
1374            if (V_loif)
(kgdb) list
1369                    }
1370                    *(unsigned short *)(tag + 1) = sa->sa_family;
1371                    m_tag_prepend(m, tag);
1372            }
1373    #ifdef VIMAGE
1374            if (V_loif)
1375                    m->m_pkthdr.rcvif = V_loif;
1376            else {
1377                    m_freem(m);
1378                    return;
(kgdb)


ok so probably there is a code-path to this point that does not first
set up the current-vnet pointer before doing this.
what you need to do is to produce a stack-trace so we can see how it got here,
and then we can figure out where on that path we should set the pointer.

Here it is:
(kgdb) #0  doadump () at pcpu.h:231
#1  0xc04d48b9 in db_fncall (dummy1=1, dummy2=0, dummy3=-1058443808,
    dummy4=0xeef1d720 "") at /usr/src/sys/ddb/db_command.c:548
#2  0xc04d4cb1 in db_command (last_cmdp=0xc0df4bdc, cmd_table=0x0, dopager=1)
    at /usr/src/sys/ddb/db_command.c:445
#3  0xc04d4e0a in db_command_loop () at /usr/src/sys/ddb/db_command.c:498
#4  0xc04d6d0d in db_trap (type=12, code=0) at /usr/src/sys/ddb/db_main.c:229
#5  0xc08e17ce in kdb_trap (type=12, code=0, tf=0xeef1d948)
    at /usr/src/sys/kern/subr_kdb.c:535
#6  0xc0c0ae7f in trap_fatal (frame=0xeef1d948, eva=24)
    at /usr/src/sys/i386/i386/trap.c:929
#7  0xc0c0b140 in trap_pfault (frame=0xeef1d948, usermode=0, eva=24)
    at /usr/src/sys/i386/i386/trap.c:851
#8  0xc0c0bad5 in trap (frame=0xeef1d948) at /usr/src/sys/i386/i386/trap.c:533
#9  0xc0bec9ac in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#10 0xc0978200 in rt_dispatch (m=0xc764ad00, sa=0x0)
    at /usr/src/sys/net/rtsock.c:1374
#11 0xc0978864 in rt_ifmsg (ifp=0xc6c3d400) at /usr/src/sys/net/rtsock.c:1168
#12 0xc76704a1 in ?? ()
#13 0xc6c3d400 in ?? ()
#14 0xeef1daa8 in ?? ()
#15 0xeef1daf4 in ?? ()
#16 0xc769ecb3 in NdisMIndicateStatusComplete (adapter=0xc76b9200)
    at /usr/src/sys/modules/ndis/../../compat/ndis/subr_ndis.c:3105
#17 0xc766d8a1 in ?? ()
#18 0xc76b9200 in ?? ()
#19 0xc76c0000 in ?? ()
#20 0xc76f1000 in ?? ()
#21 0xeef1dacc in ?? ()
#22 0xc79d2afd in ndis_bcmwl5_sys_drv_data_start ()
   from /boot/modules/bcmwl5_sys.ko
#23 0x006c0000 in ?? ()
#24 0xeef1dbb4 in ?? ()
#25 0xc79dcdac in ndis_bcmwl5_sys_drv_data_start ()
   from /boot/modules/bcmwl5_sys.ko
#26 0xc76c0000 in ?? ()
#27 0xc76c0000 in ?? ()
#28 0xc7340800 in ?? ()
#29 0xc086adcc in hardclock_cpu (usermode=7077888)
    at /usr/src/sys/kern/kern_clock.c:447
#30 0xc79d2afd in ndis_bcmwl5_sys_drv_data_start ()
   from /boot/modules/bcmwl5_sys.ko
#31 0x006c0000 in ?? ()
#32 0xeef1dbb4 in ?? ()
#33 0xc79dcdac in ndis_bcmwl5_sys_drv_data_start ()
   from /boot/modules/bcmwl5_sys.ko
#34 0xc76c0000 in ?? ()
#35 0xc76c0000 in ?? ()
#36 0xc7340800 in ?? ()
#37 0xc086adcc in hardclock_cpu (usermode=-949223424)
    at /usr/src/sys/kern/kern_clock.c:447
Previous frame inner to this frame (corrupt stack?)
(kgdb)


and the panic, in case it helps:
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x18
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc0978200
stack pointer           = 0x28:0xeef1d988
frame pointer           = 0x28:0xeef1d9a0
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         = 1404 (Windows Workitem 3)
panic: from debugger
cpuid = 1
KDB: stack backtrace:
Physical memory: 2916 MB
Dumping 113 MB: 98 82 66 50 34 18 2

Thanks, Nikos
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