Message-ID: <18906.49779.243047.207639@stoffel.org>
Date:	Mon, 6 Apr 2009 23:03:15 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	linux-kernel@...r.kernel.org
CC:	netdev@...r.kernel.org
Subject: tcpdump crashes 2.6.29.1 (and 2.6.29-rc5)


Hi,

I've got an AMD64x2 system, x86_64, SMP, PREEMPT, with 4Gb of RAM,
running 2.6.29.1 (most recently running 2.6.29-rc5 for a while before
that) which crashes when I run 'tcpdump host x.y.z.n'.  I'm on
linux-kernel, but not netdev, so please keep me in the headers.

I have't tried wireshark or ethereal yet, since I just wanted to see
if packets were getting forwarded.  My main firewall is a m0n0wall
WRAP board, so there's no much to do there debugging wise.  Ping does
seem to work from both the firewall (192.1681.254) to 192.168.2.200
once I put in the proper static route via sail
(192.168.1.3/192.168.2.3).

Background: I'm working on setting up a PXE boot environment for a new
box without a CDROM.  My current system, sail, has eth0 on the
192.168.1.0/24 subnet, with an IP of 192.168.1.3, and my WAN router
(with DHCP) is setup at 192.168.1.254.  So I setup eth1 on the
192.168.2.0/24 subnet, with a DHCP server on my host, and an IP of
192.168.2.3 on that subnet.  More details:


    eth0      Link encap:Ethernet  HWaddr 00:1e:8c:45:f3:e5  
	      inet addr:192.168.1.3  Bcast:192.168.1.255
	      Mask:255.255.255.0
	      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
	      RX packets:8663 errors:0 dropped:0 overruns:0 frame:0
	      TX packets:10088 errors:0 dropped:0 overruns:0 carrier:0
	      collisions:0 txqueuelen:1000 
	      RX bytes:3329485 (3.3 MB)  TX bytes:2088101 (2.0 MB)
	      Interrupt:26 Base address:0xe000 

    eth1      Link encap:Ethernet  HWaddr 00:1e:8c:46:0e:74  
	      inet addr:192.168.2.3  Bcast:192.168.2.255
	      Mask:255.255.255.0
	      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
	      RX packets:8 errors:0 dropped:0 overruns:0 frame:0
	      TX packets:71 errors:0 dropped:0 overruns:0 carrier:0
	      collisions:0 txqueuelen:1000 
	      RX bytes:1608 (1.6 KB)  TX bytes:11169 (11.1 KB)
	      Interrupt:27 Base address:0xa000 

    > cat /proc/sys/net/ipv4/ip_forward 
    1

    > cat /proc/version 
    Linux version 2.6.29.1 (root@...l) (gcc version 4.3.3 (Ubuntu
    4.3.3-5ubuntu4) ) #22 SMP PREEMPT Mon Apr 6 21:41:56 EDT 2009

    > netstat -nr
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags   MSS Window
    irtt Iface
    192.168.2.0     0.0.0.0         255.255.255.0   U         0 0
    0 eth1
    192.168.1.0     0.0.0.0         255.255.255.0   U         0 0
    0 eth0
    169.254.0.0     0.0.0.0         255.255.0.0     U         0 0
    0 eth1
    0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0
    0 eth0

    > ip route
    192.168.2.0/24 dev eth1  proto kernel  scope link  src 192.168.2.3 
    192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.3 
    169.254.0.0/16 dev eth1  scope link  metric 1000 
    default via 192.168.1.254 dev eth0  metric 100 


    > tcpdump --version
    tcpdump version 3.9.8
    libpcap version 1.0.0

I don't have any ip_tables stuff loaded, which might be needed for my
setup, but which doesn't seem to be implicated in this crash right
now.

I can now PXEboot my client just fine, but connections from the
192.168.2.200 PXE host don't seem to get properly forwarded out to the
internet so I can continue the network boot and install of Debian.  So
to figure out what I was going wrong, I would try to do 'tcpdump host
192.168.2.200' on 'sail' and it would instantly hang.  I mucked around
and got netconsole setup and got the following ksymoops.

Hopefully they'll be helpful.  I'll be happy to try and bisect this,
and I'll start moving back in versions to see if I can find where this
crash takes place.

[ 1396.271782] BUG: unable to handle kernel paging request at ffff880020a15cc0
[ 1396.271809] IP: [<ffffffff803f436b>] memcpy_c+0xb/0x20
[ 1396.271837] PGD 202063 PUD 206063 PMD 20a001e2 
[ 1396.271864] Oops: 0000 [#1] PREEMPT SMP 
[ 1396.271887] last sysfs file: /sys/module/loop/initstate
[ 1396.271896] CPU 1 
[ 1396.271907] Modules linked in: cryptoloop loop kvm_amd netconsole configfs binfmt_misc radeon drm af_packet kvm nfs ftdi_sio usbserial ata_generic pata_jmicron ohci1394 ieee1394 k8temp uvcvideo videodev v4l1_compat v4l2_compat_ioctl32 i2c_nforce2 i2c_core [last unloaded: kvm_amd]
[ 1396.272062] Pid: 0, comm: swapper Not tainted 2.6.29.1 #22 System Product Name
[ 1396.272070] RIP: 0010:[<ffffffff803f436b>]  [<ffffffff803f436b>] memcpy_c+0xb/0x20
[ 1396.272087] RSP: 0018:ffff88011e8b7b00  EFLAGS: 00010002
[ 1396.272095] RAX: ffff8800cac5d2c0 RBX: 0000000000000012 RCX: 0000000000000002
[ 1396.272103] RDX: 0000000000000002 RSI: ffff880020a15cc0 RDI: ffff8800cac5d2c0
[ 1396.272112] RBP: ffff88011e8b7b38 R08: 0000000000000080 R09: 000000000004b000
[ 1396.272120] R10: 0000000000000012 R11: 00000000ffffff82 R12: 00000000000002d2
[ 1396.272129] R13: 0000000000000012 R14: ffff880020a15cc0 R15: 0000000000000012
[ 1396.272138] FS:  00007fe36d6f1700(0000) GS:ffff88011f5d92c0(0000) knlGS:0000000000000000
[ 1396.272146] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 1396.272155] CR2: ffff880020a15cc0 CR3: 0000000115e14000 CR4: 00000000000006e0
[ 1396.272163] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1396.272172] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1396.272181] Process swapper (pid: 0, threadinfo ffff88011e8b0000, task ffff88011e89b820)
[ 1396.272189] Stack:
[ 1396.272195]  ffffffff804e6444 ffff88010aab2ec0 0000000000000000 0000000000000012
[ 1396.272216]  0000000020a15cc0 00000000000002c0 ffff88010aab2ec0 ffff88011e8b7b78
[ 1396.272247]  ffffffff804e760e 0000000000000096 ffff8800cac5d280 ffff88010aab2ec0
[ 1396.272279] Call Trace:
[ 1396.272287]  <IRQ> <0> [<ffffffff804e6444>] ? mon_copy_to_buff+0x74/0xa0
[ 1396.272309]  [<ffffffff804e760e>] mon_dmapeek_vec+0x9e/0x120
[ 1396.272322]  [<ffffffff804e67bf>] mon_bin_event+0x34f/0x3d0
[ 1396.272338]  [<ffffffff804e6850>] mon_bin_complete+0x10/0x20
[ 1396.272350]  [<ffffffff804e4658>] mon_bus_complete+0x48/0x80
[ 1396.272364]  [<ffffffff804e46b4>] mon_complete+0x24/0x40
[ 1396.272376]  [<ffffffff804d400b>] usb_hcd_giveback_urb+0x9b/0xe0
[ 1396.272390]  [<ffffffff804e8416>] ehci_urb_done+0x106/0x130
[ 1396.272404]  [<ffffffff804e9d3a>] qh_completions+0x31a/0x680
[ 1396.272417]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272433]  [<ffffffff804ea183>] ehci_work+0xe3/0xbf0
[ 1396.272446]  [<ffffffff804f1690>] ehci_irq+0x2b0/0x430
[ 1396.272460]  [<ffffffff8026e869>] ? getnstimeofday+0x59/0xe0
[ 1396.272474]  [<ffffffff80269979>] ? ktime_get_ts+0x59/0x60
[ 1396.272489]  [<ffffffff804d399c>] usb_hcd_irq+0x4c/0xb0
[ 1396.272502]  [<ffffffff8028e9d3>] handle_IRQ_event+0x43/0x80
[ 1396.272516]  [<ffffffff802902f2>] handle_fasteoi_irq+0x82/0x100
[ 1396.272532]  [<ffffffff802161a1>] do_IRQ+0x81/0x110
[ 1396.272545]  [<ffffffff80214213>] ret_from_intr+0x0/0x29
[ 1396.272558]  <EOI> <0> [<ffffffff8022ef76>] ? native_safe_halt+0x6/0x10
[ 1396.272580]  [<ffffffff8021ad8d>] ? default_idle+0x4d/0x50
[ 1396.272594]  [<ffffffff8021af41>] ? c1e_idle+0x51/0x120
[ 1396.272607]  [<ffffffff80661291>] ? atomic_notifier_call_chain+0x11/0x20
[ 1396.272620]  [<ffffffff80212679>] ? cpu_idle+0x69/0xd0
[ 1396.272636]  [<ffffffff80656b97>] ? start_secondary+0x182/0x1db
[ 1396.272650] Code: 81 ea d8 1f 00 00 48 3b 42 20 73 07 48 8b 50 f9 31 c0 c3 31 d2 48 c7 c0 f2 ff ff ff c3 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 
[ 1396.272759] RIP  [<ffffffff803f436b>] memcpy_c+0xb/0x20
[ 1396.272759]  RSP <ffff88011e8b7b00>
[ 1396.272759] CR2: ffff880020a15cc0
[ 1396.272759] ---[ end trace 091310ffa51c7f18 ]---
[ 1396.272759] Kernel panic - not syncing: Fatal exception in interrupt
[ 1396.272759] ------------[ cut here ]------------
[ 1396.272759] WARNING: at kernel/smp.c:329 smp_call_function_many+0x231/0x2a0()
[ 1396.272759] Hardware name: System Product Name
[ 1396.272759] Modules linked in: cryptoloop loop kvm_amd netconsole configfs binfmt_misc radeon drm af_packet kvm nfs ftdi_sio usbserial ata_generic pata_jmicron ohci1394 ieee1394 k8temp uvcvideo videodev v4l1_compat v4l2_compat_ioctl32 i2c_nforce2 i2c_core [last unloaded: kvm_amd]
[ 1396.272759] Pid: 0, comm: swapper Tainted: G      D    2.6.29.1 #22
[ 1396.272759] Call Trace:
[ 1396.272759]  <IRQ>  [<ffffffff8024e610>] warn_slowpath+0xd0/0x130
[ 1396.272759]  [<ffffffff803f2fa1>] ? vsnprintf+0x351/0xbb0
[ 1396.272759]  [<ffffffff803f204f>] ? put_dec+0x11f/0x130
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff8048157b>] ? nv_start_xmit_optimized+0x47b/0x5c0
[ 1396.272759]  [<ffffffff8021b030>] ? stop_this_cpu+0x0/0x30
[ 1396.272759]  [<ffffffff805bf535>] ? netpoll_send_udp+0x205/0x220
[ 1396.272759]  [<ffffffff802777f1>] smp_call_function_many+0x231/0x2a0
[ 1396.272759]  [<ffffffff8021b030>] ? stop_this_cpu+0x0/0x30
[ 1396.272759]  [<ffffffff8022feb9>] ? default_spin_lock_flags+0x9/0x10
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff8024eebd>] ? release_console_sem+0x1bd/0x210
[ 1396.272759]  [<ffffffff8024f5b0>] ? vprintk+0x3d0/0x450
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff8065af15>] ? printk+0x67/0x6a
[ 1396.272759]  [<ffffffff8027ef74>] ? crash_kexec+0x74/0x100
[ 1396.272759]  [<ffffffff8022feb9>] ? default_spin_lock_flags+0x9/0x10
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff8024eebd>] ? release_console_sem+0x1bd/0x210
[ 1396.272759]  [<ffffffff8027788f>] smp_call_function+0x2f/0x70
[ 1396.272759]  [<ffffffff80227fd3>] native_smp_send_stop+0x23/0x50
[ 1396.272759]  [<ffffffff8065ade9>] panic+0xbe/0x183
[ 1396.272759]  [<ffffffff8027ef74>] ? crash_kexec+0x74/0x100
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff8024eebd>] ? release_console_sem+0x1bd/0x210
[ 1396.272759]  [<ffffffff8024f195>] ? console_unblank+0x75/0x90
[ 1396.272759]  [<ffffffff8065ee04>] oops_end+0xe4/0xf0
[ 1396.272759]  [<ffffffff806606fa>] do_page_fault+0x22a/0xcd0
[ 1396.272759]  [<ffffffff8025be41>] ? complete_signal+0x121/0x210
[ 1396.272759]  [<ffffffff8025c0fe>] ? send_signal+0x1ce/0x2d0
[ 1396.272759]  [<ffffffff80240aa5>] ? check_preempt_wakeup+0x175/0x190
[ 1396.272759]  [<ffffffff80249a0c>] ? try_to_wake_up+0x16c/0x240
[ 1396.272759]  [<ffffffff804c484b>] ? nv_swncq_host_interrupt+0x17b/0x760
[ 1396.272759]  [<ffffffff802415b8>] ? enqueue_task_fair+0x188/0x1d0
[ 1396.272759]  [<ffffffff8065e145>] page_fault+0x25/0x30
[ 1396.272759]  [<ffffffff803f436b>] ? memcpy_c+0xb/0x20
[ 1396.272759]  [<ffffffff804e6444>] ? mon_copy_to_buff+0x74/0xa0
[ 1396.272759]  [<ffffffff804e760e>] mon_dmapeek_vec+0x9e/0x120
[ 1396.272759]  [<ffffffff804e67bf>] mon_bin_event+0x34f/0x3d0
[ 1396.272759]  [<ffffffff804e6850>] mon_bin_complete+0x10/0x20
[ 1396.272759]  [<ffffffff804e4658>] mon_bus_complete+0x48/0x80
[ 1396.272759]  [<ffffffff804e46b4>] mon_complete+0x24/0x40
[ 1396.272759]  [<ffffffff804d400b>] usb_hcd_giveback_urb+0x9b/0xe0
[ 1396.272759]  [<ffffffff804e8416>] ehci_urb_done+0x106/0x130
[ 1396.272759]  [<ffffffff804e9d3a>] qh_completions+0x31a/0x680
[ 1396.272759]  [<ffffffff8065dc5a>] ? _spin_unlock_irqrestore+0x4a/0x60
[ 1396.272759]  [<ffffffff804ea183>] ehci_work+0xe3/0xbf0
[ 1396.272759]  [<ffffffff804f1690>] ehci_irq+0x2b0/0x430
[ 1396.272759]  [<ffffffff8026e869>] ? getnstimeofday+0x59/0xe0
[ 1396.272759]  [<ffffffff80269979>] ? ktime_get_ts+0x59/0x60
[ 1396.272759]  [<ffffffff804d399c>] usb_hcd_irq+0x4c/0xb0
[ 1396.272759]  [<ffffffff8028e9d3>] handle_IRQ_event+0x43/0x80
[ 1396.272759]  [<ffffffff802902f2>] handle_fasteoi_irq+0x82/0x100
[ 1396.272759]  [<ffffffff802161a1>] do_IRQ+0x81/0x110
[ 1396.272759]  [<ffffffff80214213>] ret_from_intr+0x0/0x29
[ 1396.272759]  <EOI>  [<ffffffff8022ef76>] ? native_safe_halt+0x6/0x10
[ 1396.272759]  [<ffffffff8021ad8d>] ? default_idle+0x4d/0x50
[ 1396.272759]  [<ffffffff8021af41>] ? c1e_idle+0x51/0x120
[ 1396.272759]  [<ffffffff80661291>] ? atomic_notifier_call_chain+0x11/0x20
[ 1396.272759]  [<ffffffff80212679>] ? cpu_idle+0x69/0xd0
[ 1396.272759]  [<ffffffff80656b97>] ? start_secondary+0x182/0x1db
[ 1396.272759] ---[ end trace 091310ffa51c7f19 ]---
[ 1396.272759] ------------[ cut here ]------------
[ 1396.272759] WARNING: at kernel/smp.c:226 smp_call_function_single+0xdf/0x170()
[ 1396.272759] Hardware name: System Product Name
[ 1396.272759] Modules linked in: cryptoloop loop kvm_amd netconsole configfs binfmt_misc radeon drm af_packet kvm nfs ftdi_sio usbserial ata_generic pata_jmicron ohci1394
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