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    Subject[BUG] Unable to handle kernel NULL pointer dereference
    Hi List,

    Sorry if it isn't the right place to ask this question, but I was
    reported the following error in the kernel.

    Syscheckd (process in the crash) is a userland (no kernel/lkm code)
    file integrity checking tool that scans the system and generates the
    md5/sha1 sum of all the files (if it helps to identify the problem).

    I am guessing it is a bug in the kernel, since no user process should
    cause this...


    [root@ss ossec]# uname -a
    Linux ss 2.6.9-55.0.9.ELsmp #1 SMP Thu Sep 27 18:27:41 EDT 2007 i686 i686
    i386 GNU/Linux


    Oct 19 11:39:53 ss kernel: Unable to handle kernel NULL pointer dereference
    at virtual address 00000000
    Oct 19 11:39:53 ss kernel: printing eip:
    Oct 19 11:39:53 ss kernel: c0190182
    Oct 19 11:39:53 ss kernel: *pde = 359c6001
    Oct 19 11:39:53 ss kernel: Oops: 0000 [#1]
    Oct 19 11:39:53 ss kernel: SMP
    Oct 19 11:39:53 ss kernel: Modules linked in: parport_pc lp parport autofs4
    crc32c libcrc32c iscsi_sfnet scsi_transport_iscsi i2c_dev i2c_
    core lock_dlm(U) gfs(U) lock_harness(U) dlm(U) cman(U) md5 ipv6 sunrpc button
    battery ac joydev ohci_hcd e1000 floppy sg dm_snapshot dm_zero
    dm_mirror ext3 jbd dm_mod ips mptscsih mptsas mptspi mptfc mptscsi mptbase
    sd_mod scsi_mod
    Oct 19 11:39:53 ss kernel: CPU: 3
    Oct 19 11:39:53 ss kernel: EIP: 0060:[] Not tainted VLI
    Oct 19 11:39:53 ss kernel: EFLAGS: 00010246 (2.6.9-55.0.9.ELsmp)
    Oct 19 11:39:53 ss kernel: EIP is at sysfs_readdir+0x123/0x187
    Oct 19 11:39:53 ss kernel: eax: 00000000 ebx: c7174ec0 ecx: ffffffff
    edx: 00000000
    Oct 19 11:39:53 ss kernel: esi: c7174ec4 edi: 00000000 ebp: e66758c4
    esp: f5ad3f60
    Oct 19 11:39:53 ss kernel: ds: 007b es: 007b ss: 0068
    Oct 19 11:39:53 ss kernel: Process ossec-syscheckd (pid: 4750,
    threadinfo=f5ad3000 task=f5f06eb0)
    Oct 19 11:39:53 ss kernel: Stack: bff835ac f7e63900 c016baf5 f5ad3fa0
    f4e18180 c0332640 f4e18180 f7ddb768
    Oct 19 11:39:53 ss kernel: c016baf5 c016b771 f5ad3fa0 ffffffda
    08b499e4 f4e18180 00000000 c016bdab
    Oct 19 11:39:54 ss kernel: 08b49b2c 08b49b14 00000eb8 ffffffea
    00000009 08b499c8 00407ff4 f5ad3000
    Oct 19 11:39:54 ss kernel: Call Trace:
    Oct 19 11:39:54 ss kernel: [] filldir64+0x0/0x11a
    Oct 19 11:39:54 ss kernel: [] filldir64+0x0/0x11a
    Oct 19 11:39:54 ss kernel: [] vfs_readdir+0x7d/0xa5
    Oct 19 11:39:54 ss kernel: [] sys_getdents64+0x80/0xba
    Oct 19 11:39:54 ss kernel: [] syscall_call+0x7/0xb
    Oct 19 11:39:54 ss kernel: [] unix_dgram_sendmsg+0x23c/0x45d
    Oct 19 11:39:54 ss kernel: Code: 04 89 69 0c 8b 75 00 8b 44 24 04 83 c0 0c 39
    c6 74 73 8d 5e fc 83 7b 14 00 74 66 89 d8 e8 07 ec ff ff 89
    c2 83 c9 ff 31 c0 89 d7 ae f7 d1 49 0f b7 43 1c c1 e8 0c 50 ff 73 20 8b 44
    24 18 ff
    Oct 19 11:39:54 ss kernel: <0>Fatal exception: panic in 5 seconds


    A similar problem was also reported in here:
    http://lists.centos.org/pipermail/centos/2007-August/085252.html

    Any clues?


    Thanks,
    -
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