VIMAGE + NDIS

[Julian Elischer]

  On 9/27/10 10:51 AM, Nikos Vassiliadis wrote:
> 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 ?? ()

hmmm maybe we need to get ndis to put in  a wrapper at this point that
is called form hardclock and sets the value before going further

I'd have to look at the code to see what happens here..

*wonders who has their fingers in this code*..

> #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
>