netdev - Re: kernel dies if loopback device not intialized

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Message-Id: <1245080498.7134.15.camel@Maple>
Date:	Mon, 15 Jun 2009 15:41:38 +0000
From:	John Dykstra <john.dykstra1@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org
Subject: Re: kernel dies if loopback device not intialized

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

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