Issue

• A kernel panic occured with RIP in netpoll_poll_dev.
• The following is the data from the resulting core:

crash> sys
      KERNEL: /usr/lib/debug/lib/modules/2.6.32-220.4.2.el6.i686/vmlinux
    DUMPFILE: vmcore_yknsshp1._xxx_  [PARTIAL DUMP]
        CPUS: 8
        DATE: Fri Sep 14 15:30:08 2012
      UPTIME: 3 days, 19:59:53
LOAD AVERAGE: 0.01, 0.02, 0.02
       TASKS: 414
    NODENAME: yknsshp1
     RELEASE: 2.6.32-220.4.2.el6.i686
     VERSION: #1 SMP Mon Feb 6 16:46:31 EST 2012
     MACHINE: i686  (2400 Mhz)
      MEMORY: 4 GB
       PANIC: "Oops: 0002 [#1] SMP " (check log for details)
crash>
crash> bt
PID: 40     TASK: f7170030  CPU: 5   COMMAND: "events/5"
 #0 [f7193b24] crash_kexec at c049a98c
 #1 [f7193b78] oops_end at c0831f82
 #2 [f7193b8c] no_context at c04331fd
 #3 [f7193bb0] bad_area_nosemaphore at c043342a
 #4 [f7193bb8] __do_page_fault at c04338a3
 #5 [f7193c38] do_page_fault at c0833905
 #6 [f7193c50] error_code (via page_fault) at c0831395
    EAX: f4cb5020  EBX: f490abcc  ECX: 00000101  EDX: f490abe0  EBP: f4cb505c
    DS:  007b      ESI: f490abe0  ES:  007b      EDI: 00000000  GS:  00e0
    CS:  0060      EIP: c079ab6a  ERR: ffffffff  EFLAGS: 00010002
 #7 [f7193c84] netpoll_poll_dev at c079ab6a
 #8 [f7193c9c] enqueue_entity at c04502e0
 #9 [f7193ccc] bond_poll_controller at f916b3c8 [bonding]
#10 [f7193cdc] netpoll_poll_dev at c079aafe
#11 [f7193d1c] netpoll_send_skb_on_dev at c079b0a8
#12 [f7193d5c] bond_dev_queue_xmit at f916c7fa [bonding]
#13 [f7193d78] bond_start_xmit at f916ca99 [bonding]
#14 [f7193d8c] __alloc_skb at c077fa8a
#15 [f7193da8] netpoll_send_skb_on_dev at c079b0eb
#16 [f7193dbc] netpoll_send_udp at c079b2fb
#17 [f7193de8] write_msg at f7e8f2cc [netconsole]
#18 [f7193e0c] __call_console_drivers at c0454c69
#19 [f7193e24] release_console_sem at c0455178
#20 [f7193e48] vprintk at c04556ff
#21 [f7193ec8] printk at c082e171
#22 [f7193ed4] e1000_print_hw_hang at f85f590d [e1000e]
#23 [f7193f68] worker_thread at c0471809
#24 [f7193fc0] kthread at c0475d22
#25 [f7193fe4] kernel_thread_helper at c0409ffd
crash>
crash> log
    :
  (snip)
    :
e1000e 0000:03:00.0: eth2: Detected Hardware Unit Hang:
  TDH                  <6a>
  TDT                  <6b>
  next_to_use          <6b>
  next_to_clean        <69>
buffer_info[next_to_clean]:
  time_stamp           <13b90319>
  next_to_watch        <6a>
  jiffies              <13b9080e>
  next_to_watch.status <0>
MAC Status             <80383>
PHY Status             <792d>
PHY 1000BASE-T Status  <3800>
PHY Extended Status    <3000>
PCI Status             <10>
BUG: unable to handle kernel NULL pointer dereference at 00000004
IP: [<c079ab6a>] netpoll_poll_dev+0x9a/0x420
*pdpt = 00000000347ce001 *pde = 000000013dd5b067
Oops: 0002 [#1] SMP
last sysfs file: /sys/devices/pci0000:ff/0000:ff:06.3/irq
Modules linked in: fuse clpka(U) nfsd lockd nfs_acl auth_rpcgss exportfs iptable_filter ip_tables clpkhb(U) cpufreq_powersave liscal(P)(U) netconsole configfs autofs4 sunrpc cpufreq_ondemand acpi_cpufreq mperf bonding ipv6 uinput power_meter microcode sg i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support ioatdma i7core_edac edac_core e1000e igb dca ext3 jbd mbcache sr_mod cdrom sd_mod crc_t10dif pata_acpi ata_generic ata_piix megaraid_sas(U) dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]

Pid: 40, comm: events/5 Tainted: P           ----------------   2.6.32-220.4.2.el6.i686 #1 NEC Express5800/R120b-1 [N8100-1718]/MS-91E7-001
EIP: 0060:[<c079ab6a>] EFLAGS: 00010002 CPU: 5
EIP is at netpoll_poll_dev+0x9a/0x420
EAX: f4cb5020 EBX: f490abcc ECX: 00000101 EDX: f490abe0
ESI: f490abe0 EDI: 00000000 EBP: f4cb505c ESP: f7193c90
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process events/5 (pid: 40, ti=f7192000 task=f7170030 task.ti=f7192000)
Stack:
 00000991 d3c180fc f34ba59c c04502e5 9173651f 00000010 f4cb5020 ffffffff
<0> 00000001 000001aa d3c1811c f4cfea00 00000000 f4db13e0 f4de9140 f916b3cd
<0> f4a58400 f4db1020 f4de9160 c079ab00 c043badd f34ba570 d3c180c0 2581a254
Call Trace:
 [<c04502e5>] ? enqueue_entity+0x155/0x490
 [<f916b3cd>] ? bond_poll_controller+0x4d/0x60 [bonding]
 [<c079ab00>] ? netpoll_poll_dev+0x30/0x420
 [<c043badd>] ? check_preempt_curr+0x4d/0x70
 [<c0427c33>] ? lapic_next_event+0x13/0x20
 [<c0483c1c>] ? clockevents_program_event+0x8c/0x120
 [<c079b0ad>] ? netpoll_send_skb_on_dev+0x12d/0x210
 [<f916c7ff>] ? bond_dev_queue_xmit+0x19f/0x1b0 [bonding]
 [<f916ca9e>] ? bond_start_xmit+0x28e/0x530 [bonding]
 [<c077fa8f>] ? __alloc_skb+0x4f/0x140
 [<c079b0ee>] ? netpoll_send_skb_on_dev+0x16e/0x210
 [<c079b300>] ? netpoll_send_udp+0x170/0x1d0
 [<f7e8f2d1>] ? write_msg+0x91/0xe0 [netconsole]
 [<f7e8f240>] ? write_msg+0x0/0xe0 [netconsole]
 [<c0454c6b>] ? __call_console_drivers+0x5b/0x70
 [<c045517d>] ? release_console_sem+0xfd/0x210
 [<c0455704>] ? vprintk+0x1a4/0x490
 [<c07758a0>] ? pci_read+0x30/0x40
 [<c06096ee>] ? pci_bus_read_config_word+0x6e/0x80
 [<c082e176>] ? printk+0x17/0x21
 [<f85f5912>] ? e1000_print_hw_hang+0x1f2/0x200 [e1000e]
 [<f85f5720>] ? e1000_print_hw_hang+0x0/0x200 [e1000e]
 [<c047180b>] ? worker_thread+0x11b/0x230
 [<c0475f60>] ? autoremove_wake_function+0x0/0x40
 [<c04716f0>] ? worker_thread+0x0/0x230
 [<c0475d24>] ? kthread+0x74/0x80
 [<c0475cb0>] ? kthread+0x0/0x80
 [<c0409fff>] ? kernel_thread_helper+0x7/0x10
Code: 00 00 64 a1 18 9d b0 c0 39 43 18 74 e7 8d 73 14 89 f0 e8 fa 5c 09 00 85 c0 74 d9 8b 44 24 18 f6 43 08 01 8b b8 40 02 00 00 74 b6 <83> 4f 04 02 f0 ff 05 0c 8f c3 c0 8d 4b 08 f0 80 4b 08 04 8b 54
EIP: [<c079ab6a>] netpoll_poll_dev+0x9a/0x420 SS:ESP 0068:f7193c90
CR2: 0000000000000004
crash>