Panic in netgraph with VIMAGE

[Marko Zec]

On Monday 25 May 2009 15:06:27 Milan Obuch wrote:
> Hi,
> there is some bug in (most probably) netgraph code. I did fresh csup and
> rebuild today. Whenever I try to turn bluetooth on (equivalent to plugging
> in the dongle), panic occurs:
>
> ubt0: <Micro Star International product 0xa97a, class 224/1, rev
> 2.00/31.64, addr 2> on usbus3
> panic:
> in /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c:634
> ng_make_node_common()
>  vnet=0 curvnet=0
> cpuid = 0
>
> This does not occur with kernel from sources three days old.

This is a known problem related to curvnet context not being set by the USB 
device attach code - I have to lurk / shop around for some cheap USB ethernet 
or bt devices to be able to reproduce & fix this locally, the alternative 
would be wild guessing and planting context setting macros at random places 
in the USB code, i.e. without testing, which I'm reluctant to do.

Marko


> Part from core.txt file:
>
> #0  doadump () at pcpu.h:246
> 246<--->pcpu.h: No such file or directory.
> <------>in pcpu.h
> (kgdb) #0  doadump () at pcpu.h:246
> #1  0xc0554e0e in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:420
> #2  0xc05550e2 in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:576
> #3  0xc0b947c1 in ng_make_node_common (type=0xc0b8f9a0, nodepp=0xc416b3a8)
>     at
> /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c:634 #4 
> 0xc0b8bcc4 in ubt_attach (dev=0xc4294280)
>
> at
> /usr/src/sys/modules/netgraph/bluetooth/ubt/../../../../dev/usb/bluetooth/n
>g_ubt.c:443 #5  0xc057dcbf in device_attach (dev=0xc4294280) at
> device_if.h:178 #6  0xc057e88e in device_probe_and_attach (dev=0xc4294280)
>     at /usr/src/sys/kern/subr_bus.c:2473
> #7  0xc0b38240 in usb2_probe_and_attach_sub (udev=0xc41fd800,
> uaa=0xe4116c1c) at
> /usr/src/sys/modules/usb/usb/../../../dev/usb/usb_device.c:1131 #8 
> 0xc0b3871a in usb2_probe_and_attach (udev=0xc41fd800, iface_index=255 'ÿ')
> at /usr/src/sys/modules/usb/usb/../../../dev/usb/usb_device.c:1288 #9 
> 0xc0b40ff0 in uhub_explore (udev=0xc3f07000)
>     at /usr/src/sys/modules/usb/usb/../../../dev/usb/usb_hub.c:218
> #10 0xc0b31f29 in usb2_bus_explore (pm=0xc3ed0dd4)
>
> at
> /usr/src/sys/modules/usb/usb/../../../dev/usb/controller/usb_controller.c:2
>15 #11 0xc0b4343a in usb2_process (arg=0xc3ed0d74)
>     at /usr/src/sys/modules/usb/usb/../../../dev/usb/usb_process.c:139
> #12 0xc0530008 in fork_exit (callout=0xc0b43360 <usb2_process>,.
>     arg=0xc3ed0d74, frame=0xe4116d38) at /usr/src/sys/kern/kern_fork.c:830
> #13 0xc070b550 in fork_trampoline () at
> /usr/src/sys/i386/i386/exception.s:270
>
> At line 634 in ng_base.c, there is
>
> INIT_VNET_NETGRAPH(curvnet);
>
> I have options VIMAGE in my kernel config (actually this is first one
> succesfully compiled with mentioned option, but I did not try it too often,
> it just failed to compile before).
>
> Now I recompiled kernel again, this time without options VIMAGE in config,
> and panic does not occur.
>
> So the original problem is INIT_VNET_NETGRAPH implementation in presence of
> options VIMAGE in kernel config. If anyone has anything to test, please let
> me know.
>
> Regards,
> Milan
> _______________________________________________
> freebsd-virtualization at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization
> To unsubscribe, send any mail to
> "freebsd-virtualization-unsubscribe at freebsd.org"