About the influence of the DVD device which was out of order that a core file was output

Issue

• A machine has rebooted and output core file when a customer was going to mount an out-of-order DVD device.

  [a part of /var/log/messages file]hda: status error: status=0x4b { DriveReady DataRequest Index Error }  
  hda: status error: error=0x4bIllegalLengthIndication EndOfMedia MediaChangeRequested LastFailedSense 0x04   
  hda: drive not ready for command  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: ATAPI reset complete  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: ATAPI reset complete  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: ATAPI reset complete  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: ATAPI reset complete  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: ATAPI reset complete  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: ATAPI reset complete  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  hda: ATAPI reset complete  
  hda: status error: status=0x20 { DeviceFault }  
  hda: status error: error=0x20LastFailedSense 0x02   
  Unable to handle kernel NULL pointer dereference at virtual address 00000000  
  printing eip:  
  c015e04f  
  *pde = 2fea5001  
  Oops: 0002 [#1]  
  SMP   
  Modules  
  linked in: nls_utf8 vfat fat nfs mptctl ipmi_devintf ipmi_si  
  ipmi_msghandler nfsd exportfs lockd nfs_acl md5 ipv6 i2c_dev i2c_core  
  sunrpc ip_nat_ftp iptable_nat ip_conntrack_ftp ipt_REJECT ipt_state  
  ip_conntrack iptable_filter ip_tables ide_dump cciss_dump scsi_dump  
  diskdump zlib_deflate usb_storage dm_mirror dm_mod button battery ac  
  joydev ehci_hcd uhci_hcd hw_random e1000 bnx2 bonding(U) sg st ext3 jbd  
  ata_piix libata cciss mptscsih qla2400(U) mptsas qla2300(U) mptspi  
  mptscsi qla2xxx(U) qla2xxx_conf(U) mptbase sd_mod scsi_mod  
  CPU:    0  
  EIP:    0060:[<c015e04f>]    Not tainted VLI  
  EFLAGS: 00010287   (2.6.9-67.0.1.ELsmp)   
  EIP is at create_empty_buffers+0x15/0x70  
  eax: 00000000   ebx: c1178ac0   ecx: 00000001   edx: 00000000  
  esi: 00000000   edi: 00000000   ebp: c1178ac0   esp: c5923d04  
  ds: 007b   es: 007b   ss: 0068  
  Process mount (pid: 14845, threadinfo=c5923000 task=f6dca1b0)  
  Stack: 0000000c f601f6e4 00000000 c015e90c 00000220 00000046 00000001 f601f6f0   
  00008000 f601f6e8 00000000 00000000 c01c302c 00000001 f601f634 c01620ea   
  00000000 f601f6e8 c1178ac0 f601f6e4 00000000 00000000 c0140922 c1178ac0   
  Call Trace:  
  [<c015e90c>] block_read_full_page+0x61/0x2af  
  [<c01c302c>] radix_tree_node_alloc+0x10/0x49  
  [<c01620ea>] blkdev_get_block+0x0/0x46  
  [<c0140922>] add_to_page_cache+0x8e/0x95  
  [<c01469b1>] read_pages+0x97/0xdd  
  [<c01443bc>] buffered_rmqueue+0x17d/0x1a5  
  [<c0144498>] __alloc_pages+0xb4/0x2a6  
  [<c0146cd5>] do_page_cache_readahead+0x138/0x158  
  [<c0146e5b>] page_cache_readahead+0x166/0x258  
  [<c0140fb5>] do_generic_mapping_read+0x138/0x445  
  [<c015dec5>] invalidate_bh_lru+0x26/0x36  
  [<c014150c>] __generic_file_aio_read+0x181/0x1b2  
  [<c01412c2>] file_read_actor+0x0/0xc9  
  [<c014161c>] generic_file_read+0x98/0xaf  
  [<c015b081>] __dentry_open+0xda/0x18f  
  [<c015af45>] filp_open+0x51/0x65  
  [<c012051d>] autoremove_wake_function+0x0/0x2d  
  [<c0162246>] block_llseek+0x30/0xeb  
  [<c0162216>] block_llseek+0x0/0xeb  
  [<c015ba62>] vfs_read+0xb6/0xe2  
  [<c015bc77>] sys_read+0x3c/0x62  
  [<c02d8613>] syscall_call+0x7/0xb  
  Code:  
  f0 e8 fd fe ff ff 89 44 24 04 8b 44 24 04 83 c4 0c 5b 5e 5f 5d c3 57 89  
  cf b9 01 00 00 00 56 53 89 c3 e8 d8 f7 ff ff 89 c6 89 c2 <09> 3a  
  89 d0 8b 52 04 85 d2 75 f5 89 70 04 8b 43 10 83 c0 4c e8