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Message-ID: <20090616215331.2a1bd276@nehalam> Date: Tue, 16 Jun 2009 21:53:31 -0700 From: Stephen Hemminger <shemminger@...tta.com> To: John Dykstra <john.dykstra1@...il.com> Cc: netdev@...r.kernel.org Subject: Re: kernel dies if loopback device not intialized On Mon, 15 Jun 2009 15:41:38 +0000 John Dykstra <john.dykstra1@...il.com> wrote: > On Wed, 2009-06-10 at 20:35 -0700, Stephen Hemminger wrote: > > This OOPS happens if system is booted up and loopback device > > is not initialized. This means the loopback device is not yet in the > > route table so when arp goes to send the error report, the route > > lookup thinks it is a martian and then dies. > > > > Granted this is a startup script problem, but kernel shouldn't die. > > > > [ 55.601158] IP: [<c028968c>] ip_handle_martian_source+0x75/0xb8 > > [ 55.604044] Oops: 0000 [#1] SMP > > [ 55.604044] last sysfs file: /sys/kernel/uevent_seqnum > > [ 55.604044] Modules linked in: iptable_nat ip6table_filter > > iptable_filter ip6table_raw ip6_tables xt_NOTRACK iptable_raw ip_tables > > x_tables nf_nat_pptp nf_conntrack_pptp nf_conntrack_proto_gre nf_nat_h323 > > nf_conntrack_h323 nf_nat_sip nf_conntrack_sip nf_nat_proto_gre nf_nat_tftp > > nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_tftp > > nf_conntrack_ftp nf_conntrack ipv6 md_mod parport_pc parport psmouse > > pcspkr serio_raw vmxnet container ac button i2c_piix4 i2c_core shpchp > > pci_hotplug intel_agp agpgart evdev vfat fat ext2 battery squashfs loop > > unionfs nls_utf8 isofs nls_base zlib_inflate ext3 jbd mbcache sd_mod sg > > crc_t10dif sr_mod cdrom ata_piix pata_acpi floppy ata_generic mptspi > > mptscsih mptbase scsi_transport_spi libata scsi_mod thermal processor fan > > thermal_sys > > [ 55.604044] > > [ 55.604044] Pid: 0, comm: swapper Not tainted (2.6.29-1-586-vyatta #1) > > VMware Virtual Platform > > [ 55.604044] EIP: 0060:[<c028968c>] EFLAGS: 00010293 CPU: 0 > > [ 55.604044] EIP is at ip_handle_martian_source+0x75/0xb8 > > [ 55.604044] EAX: 0000000e EBX: 00000000 ECX: c03e3d28 EDX: c03611e7 > > [ 55.604044] ESI: ddc40000 EDI: fffffc00 EBP: 00000000 ESP: c03e3d28 > > [ 55.604044] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > > [ 55.604044] Process swapper (pid: 0, ti=c03e2000 task=c038533c > > task.ti=c03e2000) > > [ 55.604044] Stack: > > [ 55.604044] 00000003 0100007f ffffffea c028c45b 1000000f 0100007f > > 00000000 00000003 > > [ 55.604044] 00000246 0100007f de5e9180 00000004 dfa6c600 df24ea80 > > c03e3dcc c03e3d90 > > [ 55.604044] 00000000 00000003 00000000 1000000f 0100007f 00000000 > > 00000000 00000000 > > [ 55.604044] Call Trace: > > [ 55.604044] [<c028c45b>] ip_route_input+0xbf8/0xc20 > > [ 55.604044] [<c02ac0a9>] icmp_send+0x361/0x4c4 > > [ 55.604044] [<c0135a7e>] sched_clock_cpu+0x13f/0x14b > > [ 55.604044] [<c011cf34>] update_rq_clock+0xe/0x1c > > [ 55.604044] [<c0289174>] ipv4_link_failure+0x14/0x37 > > [ 55.604044] [<c02aa056>] arp_error_report+0x1c/0x24 > > [ 55.604044] [<c027a3ae>] neigh_timer_handler+0x1c4/0x282 > > [ 55.604044] [<c027a1ea>] neigh_timer_handler+0x0/0x282 > > [ 55.604044] [<c01298eb>] run_timer_softirq+0x139/0x191 > > [ 55.604044] [<c027a1ea>] neigh_timer_handler+0x0/0x282 > > [ 55.604044] [<c012680a>] __do_softirq+0x83/0x103 > > [ 55.604044] [<c01268bc>] do_softirq+0x32/0x36 > > [ 55.604044] [<c01269d7>] irq_exit+0x35/0x62 > > [ 55.604044] [<c010fbc4>] smp_apic_timer_interrupt+0x71/0x7b > > [ 55.604044] [<c0103a48>] apic_timer_interrupt+0x28/0x30 > > [ 55.604044] [<c01085f0>] default_idle+0x2a/0x3d > > [ 55.604044] [<c0102489>] cpu_idle+0x57/0x72 > > [ 55.604044] Code: e8 a1 f1 04 00 83 c4 10 66 83 be d2 00 00 00 00 74 58 > > 8b bf 98 00 00 00 85 ff 74 4e 68 e7 11 36 c0 31 db e8 7e f1 04 00 58 eb 29 > > <0f> b6 04 1f 50 68 c8 20 35 c0 e8 6c f1 04 00 0f b7 86 d2 00 00 > > [ 55.604044] EIP: [<c028968c>] ip_handle_martian_source+0x75/0xb8 SS:ESP > > 0068:c03e3d28 > > [ 55.604044] ---[ end trace bfa8f60b4b45cd60 ]--- > > [ 55.604044] Kernel panic - not syncing: Fatal exception in interrupt > > The oops seems to be from the skb passed to ip_handle_martian_source(), > which is the skb pulled from the ARP queue. Either skb->mac_header is > bogus, or the skb pointer itself is: > > movl 148(%edi), %edi # <variable>.mac_header, D.47506 > testl %edi, %edi # D.47506 > je .L141 #, > pushl $.LC1 # > xorl %ebx, %ebx # i > call printk # > popl %eax # > jmp .L136 # > .L137: > movzbl (%ebx,%edi), %eax #* D.47506, tmp72 ******** trap here ******* > pushl %eax # tmp72 > pushl $.LC2 # > call printk # > movzwl 210(%esi), %eax # <variable>.hard_header_len, <variable>.hard_header_len > popl %edx # > decl %eax # tmp74 > cmpl %eax, %ebx # tmp74, i > popl %ecx # > jge .L138 #, > pushl $.LC3 # > call printk # > popl %eax # > .L138: > incl %ebx # i > .L136: > movzwl 210(%esi), %eax # <variable>.hard_header_len, <variable>.hard_header_len > cmpl %eax, %ebx # <variable>.hard_header_len, i > jl .L137 #, > > Stephen, I haven't been able to reproduce this--can you provide a > recipe? Where is that packet coming from? > > -- John > The packets come from SNMP smux which opens a TCP socket over 127.1 but the loopback interface is in admin down. I suspect the packet bouncing from ARP is the TCP SYN packet which does not have a mac_header() because it is going over the (down) loopback. -- -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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