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synced 2024-09-20 01:20:54 +00:00
1f17e2f2c8
lkp-robot reported a BUG:
[ 10.151226] BUG: unable to handle kernel NULL pointer dereference at 00000198
[ 10.152525] IP: rt6_fill_node+0x164/0x4b8
[ 10.153307] *pdpt = 0000000012ee5001 *pde = 0000000000000000
[ 10.153309]
[ 10.154492] Oops: 0000 [#1]
[ 10.154987] CPU: 0 PID: 909 Comm: netifd Not tainted 4.10.0-rc4-00722-g41e8c70ee162-dirty #10
[ 10.156482] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 10.158254] task: d0deb000 task.stack: d0e0c000
[ 10.159059] EIP: rt6_fill_node+0x164/0x4b8
[ 10.159780] EFLAGS: 00010296 CPU: 0
[ 10.160404] EAX: 00000000 EBX: d10c2358 ECX: c1f7c6cc EDX: c1f6ff44
[ 10.161469] ESI: 00000000 EDI: c2059900 EBP: d0e0dc4c ESP: d0e0dbe4
[ 10.162534] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
[ 10.163482] CR0: 80050033 CR2: 00000198 CR3: 10d94660 CR4: 000006b0
[ 10.164535] Call Trace:
[ 10.164993] ? paravirt_sched_clock+0x9/0xd
[ 10.165727] ? sched_clock+0x9/0xc
[ 10.166329] ? sched_clock_cpu+0x19/0xe9
[ 10.166991] ? lock_release+0x13e/0x36c
[ 10.167652] rt6_dump_route+0x4c/0x56
[ 10.168276] fib6_dump_node+0x1d/0x3d
[ 10.168913] fib6_walk_continue+0xab/0x167
[ 10.169611] fib6_walk+0x2a/0x40
[ 10.170182] inet6_dump_fib+0xfb/0x1e0
[ 10.170855] netlink_dump+0xcd/0x21f
This happens when the loopback device is set down and a ipv6 fib route
dump is requested.
ip6_null_entry is the root of all ipv6 fib tables making it integrated
into the table and hence passed to the ipv6 route dump code. The
null_entry route uses the loopback device for dst.dev but may not have
rt6i_idev set because of the order in which initializations are done --
ip6_route_net_init is run before addrconf_init has initialized the
loopback device. Fixing the initialization order is a much bigger problem
with no obvious solution thus far.
The BUG is triggered when the loopback is set down and the netif_running
check added by
|
||
|---|---|---|
| .. | ||
| ila | ||
| netfilter | ||
| addrconf.c | ||
| addrconf_core.c | ||
| addrlabel.c | ||
| af_inet6.c | ||
| ah6.c | ||
| anycast.c | ||
| calipso.c | ||
| datagram.c | ||
| esp6.c | ||
| exthdrs.c | ||
| exthdrs_core.c | ||
| exthdrs_offload.c | ||
| fib6_rules.c | ||
| fou6.c | ||
| icmp.c | ||
| inet6_connection_sock.c | ||
| inet6_hashtables.c | ||
| ip6_checksum.c | ||
| ip6_fib.c | ||
| ip6_flowlabel.c | ||
| ip6_gre.c | ||
| ip6_icmp.c | ||
| ip6_input.c | ||
| ip6_offload.c | ||
| ip6_offload.h | ||
| ip6_output.c | ||
| ip6_tunnel.c | ||
| ip6_udp_tunnel.c | ||
| ip6_vti.c | ||
| ip6mr.c | ||
| ipcomp6.c | ||
| ipv6_sockglue.c | ||
| Kconfig | ||
| Makefile | ||
| mcast.c | ||
| mcast_snoop.c | ||
| mip6.c | ||
| ndisc.c | ||
| netfilter.c | ||
| output_core.c | ||
| ping.c | ||
| proc.c | ||
| protocol.c | ||
| raw.c | ||
| reassembly.c | ||
| route.c | ||
| seg6.c | ||
| seg6_hmac.c | ||
| seg6_iptunnel.c | ||
| sit.c | ||
| syncookies.c | ||
| sysctl_net_ipv6.c | ||
| tcp_ipv6.c | ||
| tcpv6_offload.c | ||
| tunnel6.c | ||
| udp.c | ||
| udp_impl.h | ||
| udp_offload.c | ||
| udplite.c | ||
| xfrm6_input.c | ||
| xfrm6_mode_beet.c | ||
| xfrm6_mode_ro.c | ||
| xfrm6_mode_transport.c | ||
| xfrm6_mode_tunnel.c | ||
| xfrm6_output.c | ||
| xfrm6_policy.c | ||
| xfrm6_protocol.c | ||
| xfrm6_state.c | ||
| xfrm6_tunnel.c | ||