[Team2013] Bug in switch

Claudiu Ghioc claudiughioc at gmail.com
Tue Mar 12 14:46:16 EET 2013 

A gasit Ionut Nicu un bug.

Configurari initiale:
[root at chimera tools]# ./swctl
Usage: swctl [command] [args]

Command can be any of:
  add iface_name Adds an interface to switch.
  addtagged iface_name tag_name Adds an interface to switch and assigns tag.
  del [-s] iface_name Removes an iterface from switch
  addvlan vlan_no vlan_name Adds a vlan to the vlan database
  delvlan vlan_no Deletes a vlan from the vlan database
  chvlan vlan_no new_vlan_name Renames vlan_no to new_vlan_name
  addportvlan iface_name vlan_no Adds vlan to allowed vlans of
  interface (trunk mode)
  delportvlan iface_name vlan_no Removes vlan from allowed vlans of
  interface (trunk mode)
  settrunk iface_name flag Puts interface in trunk (flag=1) or
  non-trunk (flag=0) mode
  setportvlan iface_name vlan_no Add interface in vlan vlan_no
  (non-trunk mode)
  clearportmac iface_name Clears fdb entries for interface
  setagetime seconds Sets aging interval (in seconds) for fdb entries
  macstatic iface_name vlan_no hw_addr Adds a static mac to interface in
vlan vlan_no
  addvif vlan_no Creates a virtual interface for
  given vlan
  delvif vlan_no Removes the virtual interface for
  given vlan
  showmac Prints switch forwarding database

[root at chimera tools]# ./swctl add eth2
[root at chimera tools]# ./swctl add eth3
[root at chimera tools]# ./swctl addvlan 2 test
[root at chimera tools]# ./swctl addvif 2
[root at chimera tools]# ip addr add 10.0.0.1/24 dev vlan2


netconsole output:
device eth2 entered promiscuous mode
e1000: eth2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
ADDRCONF(NETDEV_UP): eth2: link is not ready
ADDRCONF(NETDEV_CHANGE): eth2: link becomes ready
device eth3 entered promiscuous mode
ADDRCONF(NETDEV_UP): eth3: link is not ready
e1000: eth3 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
ADDRCONF(NETDEV_CHANGE): eth3: link becomes ready
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<e10a9a13>] sw_forward+0x273/0x640 [switch]
*pdpt = 000000001f9f9001 *pde = 000000001f9ee067 *pte = 0000000000000000
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/virtual/net/vlan2/address
Modules linked in: switch netconsole configfs ipt_REJECT nf_conntrack_ipv4
nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6
nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 ppdev
parport_pc parport i2c_piix4 i2c_core snd_intel8x0 snd_ac97_codec ac97_bus
snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc e1000
sg ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom ahci pata_acpi
ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded:
scsi_wait_scan]

Pid: 0, comm: swapper Not tainted 2.6.32-279.9.1.el6.lisa2.0.1.build3.i686
#1 innotek GmbH VirtualBox/VirtualBox
EIP: 0060:[<e10a9a13>] EFLAGS: 00010246 CPU: 0
EIP is at sw_forward+0x273/0x640 [switch]
EAX: 00000000 EBX: de265080 ECX: de27c010 EDX: de26d444
ESI: 00000000 EDI: 00000002 EBP: c0a1bd7c ESP: c0a1bd10
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process swapper (pid: 0, ti=c0a1a000 task=c0a425e0 task.ti=c0a1a000)
Stack:
 00000000 e10bd378 de26d444 00000002 e10ad060 c051f701 00000246 1600005e
<0> c0c4e820 00000246 e0fcf40b e0fc9644 de466148 00000020 00000004 0000000c
<0> 00000246 e10227ef 00015080 00000000 de265080 e0fccfdf de265080 de26d3e0
Call Trace:
 [<c051f701>] ? __kmalloc+0x131/0x180
 [<e0fcf40b>] ? __nf_ct_ext_add+0x13b/0x1a0 [nf_conntrack]
 [<e0fc9644>] ? __nf_conntrack_find+0x74/0x110 [nf_conntrack]
 [<e10227ef>] ? ipt_do_table+0x28f/0x580 [ip_tables]
 [<e0fccfdf>] ? packet+0x1f/0x30 [nf_conntrack]
 [<e10abd2e>] ? sw_vif_hard_start_xmit+0x5e/0x90 [switch]
 [<c0794e69>] ? dev_hard_start_xmit+0x199/0x410
 [<e0fca34b>] ? __nf_conntrack_confirm+0x15b/0x340 [nf_conntrack]
 [<c07ad4f3>] ? sch_direct_xmit+0x113/0x180
 [<e10464c8>] ? ipv4_confirm+0x68/0x190 [nf_conntrack_ipv4]
 [<c0798f7d>] ? dev_queue_xmit+0x4ed/0x6f0
 [<c07ac888>] ? eth_header+0x28/0xc0
 [<c07ac860>] ? eth_header+0x0/0xc0
 [<c079d10d>] ? neigh_resolve_output+0xdd/0x330
 [<c07c68c4>] ? ip_finish_output+0x1c4/0x280
 [<c07c6a0a>] ? ip_output+0x8a/0xb0
 [<c07c5ec5>] ? ip_local_out+0x15/0x20
 [<c07f101a>] ? igmp_ifc_timer_expire+0x25a/0x2e0
 [<c0466991>] ? run_timer_softirq+0x131/0x2b0
 [<c07f0dc0>] ? igmp_ifc_timer_expire+0x0/0x2e0
 [<c045cf6a>] ? __do_softirq+0x8a/0x1a0
 [<c045d0bd>] ? do_softirq+0x3d/0x50
 [<c045d215>] ? irq_exit+0x65/0x70
 [<c0428dc3>] ? smp_apic_timer_interrupt+0x53/0x90
 [<c083f505>] ? apic_timer_interrupt+0x31/0x38
 [<c04118a1>] ? mwait_idle+0x61/0xc0
 [<c0408964>] ? cpu_idle+0x94/0xd0
 [<c0aa79fc>] ? start_kernel+0x3b0/0x3b5
 [<c0aa748a>] ? unknown_bootoption+0x0/0x190
Code: 24 0c 8b 44 24 0c 8b 54 24 08 83 c6 07 85 ff 8b 7c 24 0c 0f 49 74 24
0c c1 f8 1f c1 e8 1d 01 c7 83 e7 07 29 c7 8b 42 1c c1 fe 03 <0f> b6 04 30
0f a3 f8 0f 82 dd 01 00 00 8b 4c 24 10 8b 01 39 c1
EIP: [<e10a9a13>] sw_forward+0x273/0x640 [switch] SS:ESP 0068:c0a1bd10
CR2: 0000000000000000
---[ end trace 669a8703b8bb24f3 ]---
Kernel panic - not syncing: Fatal exception in interrupt
Pid: 0, comm: swapper Tainted: G      D    ---------------
 2.6.32-279.9.1.el6.lisa2.0.1.build3.i686 #1
Call Trace:
 [<c083c48c>] ? panic+0x68/0x11c
 [<c0840398>] ? oops_end+0xc8/0xd0
 [<c0433dd2>] ? no_context+0xc2/0x190
 [<c0433fff>] ? bad_area_nosemaphore+0xf/0x20
 [<c04344e8>] ? __do_page_fault+0x2d8/0x430
 [<c07e7397>] ? arp_constructor+0x167/0x1a0
 [<c07e70fb>] ? arp_bind_neighbour+0x9b/0xa0
 [<c0841cea>] ? do_page_fault+0x2a/0x90
 [<c0841cc0>] ? do_page_fault+0x0/0x90
 [<c083f777>] ? error_code+0x73/0x78
 [<e10a9a13>] ? sw_forward+0x273/0x640 [switch]
 [<c051f701>] ? __kmalloc+0x131/0x180
 [<e0fcf40b>] ? __nf_ct_ext_add+0x13b/0x1a0 [nf_conntrack]
 [<e0fc9644>] ? __nf_conntrack_find+0x74/0x110 [nf_conntrack]
 [<e10227ef>] ? ipt_do_table+0x28f/0x580 [ip_tables]
 [<e0fccfdf>] ? packet+0x1f/0x30 [nf_conntrack]
 [<e10abd2e>] ? sw_vif_hard_start_xmit+0x5e/0x90 [switch]
 [<c0794e69>] ? dev_hard_start_xmit+0x199/0x410
 [<e0fca34b>] ? __nf_conntrack_confirm+0x15b/0x340 [nf_conntrack]
 [<c07ad4f3>] ? sch_direct_xmit+0x113/0x180
 [<e10464c8>] ? ipv4_confirm+0x68/0x190 [nf_conntrack_ipv4]
 [<c0798f7d>] ? dev_queue_xmit+0x4ed/0x6f0
 [<c07ac888>] ? eth_header+0x28/0xc0
 [<c07ac860>] ? eth_header+0x0/0xc0
 [<c079d10d>] ? neigh_resolve_output+0xdd/0x330
 [<c07c68c4>] ? ip_finish_output+0x1c4/0x280
 [<c07c6a0a>] ? ip_output+0x8a/0xb0
 [<c07c5ec5>] ? ip_local_out+0x15/0x20
 [<c07f101a>] ? igmp_ifc_timer_expire+0x25a/0x2e0
 [<c0466991>] ? run_timer_softirq+0x131/0x2b0
 [<c07f0dc0>] ? igmp_ifc_timer_expire+0x0/0x2e0
 [<c045cf6a>] ? __do_softirq+0x8a/0x1a0
 [<c045d0bd>] ? do_softirq+0x3d/0x50
 [<c045d215>] ? irq_exit+0x65/0x70
 [<c0428dc3>] ? smp_apic_timer_interrupt+0x53/0x90
 [<c083f505>] ? apic_timer_interrupt+0x31/0x38
 [<c04118a1>] ? mwait_idle+0x61/0xc0
 [<c0408964>] ? cpu_idle+0x94/0xd0
 [<c0aa79fc>] ? start_kernel+0x3b0/0x3b5
 [<c0aa748a>] ? unknown_bootoption+0x0/0x190


-- 
Claudiu Ghioc
Software Developer
CloudBit
Email: claudiu.ghioc at gmail.com
+(40) 745 783 796
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