2.6.1-mm5 - oops during network initialization

[Valdis Kletnieks]

(linux-net people, please cc: on replies, am only on lkml)

Under 2.6.1-mm4, at boot I'd get the following:

Jan 20 10:00:46 turing-police kernel: Initializing IPsec netlink socket
Jan 20 10:00:46 turing-police kernel: NET: Registered protocol family 1
Jan 20 10:00:46 turing-police kernel: NET: Registered protocol family 10
Jan 20 10:00:46 turing-police kernel: IPv6 over IPv4 tunneling driver
Jan 20 10:00:46 turing-police kernel: NET: Registered protocol family 17
Jan 20 10:00:46 turing-police kernel: NET: Registered protocol family 15
Jan 20 10:00:46 turing-police kernel: RAMDISK: Compressed image found at block 0

and the initrd would kick off and we'd be happy.

Under 2.6.1-mm5, I get this: (hand-copied..

NET: Registered protocol family 10
Unable to handle kernel NULL pointer dereference at virtual address 00000068
 printing eip:
c01186f9
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
CPU: 0
EIP: 0060:[<c01180f9>]  Not tainted VLI
EFLAGS: 0010217
EIP is at do_page_fault+0x53/0x4b2
eax: cfe84000 ebx: cfe86000 ecx: 0000007b edx: 00000000
esi: 00000000 edi: 00000000 ebp: cfe84048 esp: cfe8405c
ds: 007b es: 007b ss: 0068
process ksoftirqd/0 (pid:2, threadinfo=cfe82000 task=cff81310
stack: 00000000 00000068 00000000 00000000 00000000 00030001 00000000 00000000
       00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
       00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
call trace:

(I had to stick a 'for (;;);' into the code at this point to keep it from scrolling off the
screen - was do_page_fault and 2 other routines in a loop over and over again).

So it's choking somewhere in IPv6 init.  Only change I can spot in -mm5 in that
area is ipv6-sysctl-oops-fix.patch but I'm not seeing how that one can *cause* this oops.

For the record, built *without* regparm-3, with the Fedora gcc-3.3.2-5 compiler.

IPv6-related .config:

CONFIG_IPV6=y
CONFIG_IPV6_PRIVACY=y
CONFIG_INET6_AH=y
CONFIG_INET6_ESP=y
CONFIG_INET6_IPCOMP=y
# CONFIG_IPV6_TUNNEL is not set
# CONFIG_DECNET is not set
# CONFIG_BRIDGE is not set
CONFIG_NETFILTER=y
# CONFIG_NETFILTER_DEBUG is not set

#
# IPv6: Netfilter Configuration
#
# CONFIG_IP6_NF_QUEUE is not set
CONFIG_IP6_NF_IPTABLES=m
CONFIG_IP6_NF_MATCH_LIMIT=m
CONFIG_IP6_NF_MATCH_MAC=m
CONFIG_IP6_NF_MATCH_RT=m
CONFIG_IP6_NF_MATCH_OPTS=m
CONFIG_IP6_NF_MATCH_FRAG=m
CONFIG_IP6_NF_MATCH_HL=m
CONFIG_IP6_NF_MATCH_MULTIPORT=m
CONFIG_IP6_NF_MATCH_OWNER=m
CONFIG_IP6_NF_MATCH_MARK=m
CONFIG_IP6_NF_MATCH_IPV6HEADER=m
CONFIG_IP6_NF_MATCH_AHESP=m
CONFIG_IP6_NF_MATCH_LENGTH=m
CONFIG_IP6_NF_MATCH_EUI64=m
CONFIG_IP6_NF_FILTER=m
CONFIG_IP6_NF_TARGET_LOG=m
CONFIG_IP6_NF_MANGLE=m
CONFIG_IP6_NF_TARGET_MARK=m
CONFIG_XFRM=y
CONFIG_XFRM_USER=y

#
# SCTP Configuration (EXPERIMENTAL)
#
CONFIG_IPV6_SCTP__=y

I'll play binary-search on the IPv6 config options, see if one of them is
involved, but that will have to wait for morning....

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