PANIC in RELENG_6 from yesterday, if_de.c
Holm Tiffe
holm at freibergnet.de
Mon Jan 29 09:20:59 UTC 2007
Hi guys,
I've build an RELENG_6 cvsupped yesterday and got a panic while booting
in if_de.c related to BPF. (Null pointer)
My friend J"org Wunsch (Tm) investigated that it was coming from if_de.c
line 4044:
/*
* bounce a copy to the bpf listener, if any.
*/
->> BPF_MTAP(sc->tulip_ifp, m);
The expansion of this macro on a 6.2-RC is as follows:
do { if ((sc->tulip_ifp)->if_bpf) { ; bpf_mtap((sc->tulip_ifp)->if_bpf, (m)); } } while (0);
on a older 6-stable this gets expanded like this:
do { if (bpf_peers_present((sc->tulip_ifp)->if_bpf)) { ; bpf_mtap_new((sc->tulip_ifp)->if_bpf, (m)); } } while (0);
The macro is coming from /sys/net/bpf.h :
#define BPF_MTAP(_ifp,_m) do { \
if ((_ifp)->if_bpf) { \
M_ASSERTVALID(_m); \
bpf_mtap((_ifp)->if_bpf, (_m)); \
} \
} while (0)
On a 6.2-RC:
#define BPF_MTAP(_ifp,_m) do { \
if (bpf_peers_present((_ifp)->if_bpf)) { \
M_ASSERTVALID(_m); \
bpf_mtap((_ifp)->if_bpf, (_m)); \
} \
} while (0)
What's going on here?
Can someone please take a look at his?
Commenting out the line 4044 from if_de.c was bringing back the network interface to
life. Unfortunately I only hve a BNC Network at home...
Kind Regards,
Holm
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