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    SubjectRe: OOPS running "ls -l /sys/class/i2c-adapter/*"-- 2.6.12-rc1-mm2
    Ahem.  In this case, I think it was operator error.  I reproduced the
    problem and have included the entire output of ksymoops below.

    Andrew, this command causes the Oops for me:

    root@Monkey100:/sys/class/i2c-adapter/i2c-1# ls
    ./ ../ device@
    root@Monkey100:/sys/class/i2c-adapter/i2c-1# ls -l
    Segmentation fault

    root@Monkey100:/sys/class/i2c-adapter/i2c-1# dmesg|ksymoops -o
    /lib/modules/2.6.12-rc1-mm2 -m /boot/
    ksymoops 2.4.9 on i686 2.6.12-rc1-mm2. Options used
    -V (default)
    -k /proc/ksyms (default)
    -l /proc/modules (default)
    -o /lib/modules/2.6.12-rc1-mm2 (specified)
    -m /boot/ (specified)

    Error (regular_file): read_ksyms stat /proc/ksyms failed
    ksymoops: No such file or directory
    No modules in ksyms, skipping objects
    No ksyms, skipping lsmod
    [<c010414e>] dump_stack+0x1e/0x20
    [<c01f0b12>] kref_get+0x42/0x50
    [<c01f005b>] kobject_get+0x1b/0x30
    [<c01986f1>] sysfs_getlink+0x41/0x150
    [<c019884f>] sysfs_follow_link+0x4f/0x60
    [<c016b46f>] generic_readlink+0x2f/0x90
    [<c01635b6>] sys_readlink+0x86/0x90
    [<c0103249>] syscall_call+0x7/0xb
    [<c010414e>] dump_stack+0x1e/0x20
    [<c01f0b12>] kref_get+0x42/0x50
    [<c01f005b>] kobject_get+0x1b/0x30
    [<c019874d>] sysfs_getlink+0x9d/0x150
    [<c019884f>] sysfs_follow_link+0x4f/0x60
    [<c016b46f>] generic_readlink+0x2f/0x90
    [<c01635b6>] sys_readlink+0x86/0x90
    [<c0103249>] syscall_call+0x7/0xb
    Unable to handle kernel paging request at virtual address 00001000
    *pde = 00000000
    Oops: 0000 [#1]
    CPU: 0
    EIP: 0060:[<c0198479>] Not tainted VLI
    Using defaults from ksymoops -t elf32-i386 -a i386
    EFLAGS: 00210246 (2.6.12-rc1-mm2)
    eax: 00000000 ebx: 00000000 ecx: ffffffff edx: f7c0181c
    esi: 00000001 edi: 00001000 ebp: e7519e94 esp: e7519e88
    ds: 007b es: 007b ss: 0068
    Stack: 00000002 e4fdea1c f7c0181c e7519eb8 c0198651 f7c0181c 00000020 f7c0181c
    e7519eb8 c039f820 e4fdea1c f7c0181c e7519edc c0198790 f7c018cc f7c0181c
    e46a3000 f7c018cc e46a3000 fffffff4 e7519f10 e7519ef8 c019884f e4fdea1c
    Call Trace:
    [<c010410f>] show_stack+0x7f/0xa0
    [<c01042aa>] show_registers+0x15a/0x1c0
    [<c01044ac>] die+0xfc/0x190
    [<c011450b>] do_page_fault+0x31b/0x670
    [<c0103cf3>] error_code+0x4f/0x54
    [<c0198651>] sysfs_get_target_path+0x21/0x80
    [<c0198790>] sysfs_getlink+0xe0/0x150
    [<c019884f>] sysfs_follow_link+0x4f/0x60
    [<c016b46f>] generic_readlink+0x2f/0x90
    [<c01635b6>] sys_readlink+0x86/0x90
    [<c0103249>] syscall_call+0x7/0xb
    Code: 75 f8 c9 c3 8d b4 26 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5
    57 56 8b 55 08 be 01 00 00 00 53 31 db 8b 3a b9 ff ff ff ff 89 d8<f2>
    ae f7 d1 49 8b 52 24 8d 74 31 01 85 d2 75 e7 5b 89 f0 5e 5f

    >>EIP; c0198479 <object_path_length+19/30> <=====

    >>ecx; ffffffff <__kernel_rt_sigreturn+1bbf/????>
    >>edx; f7c0181c <pg0+3773581c/3fb32400>
    >>ebp; e7519e94 <pg0+2704de94/3fb32400>
    >>esp; e7519e88 <pg0+2704de88/3fb32400>

    Trace; c010410f <show_stack+7f/a0>
    Trace; c01042aa <show_registers+15a/1c0>
    Trace; c01044ac <die+fc/190>
    Trace; c011450b <do_page_fault+31b/670>
    Trace; c0103cf3 <error_code+4f/54>
    Trace; c0198651 <sysfs_get_target_path+21/80>
    Trace; c0198790 <sysfs_getlink+e0/150>
    Trace; c019884f <sysfs_follow_link+4f/60>
    Trace; c016b46f <generic_readlink+2f/90>
    Trace; c01635b6 <sys_readlink+86/90>
    Trace; c0103249 <syscall_call+7/b>

    This architecture has variable length instructions, decoding before eip
    is unreliable, take these instructions with a pinch of salt.

    Code; c019844e <object_depth+e/20>
    00000000 <_EIP>:
    Code; c019844e <object_depth+e/20>
    0: 75 f8 jne fffffffa <_EIP+0xfffffffa>
    Code; c0198450 <object_depth+10/20>
    2: c9 leave
    Code; c0198451 <object_depth+11/20>
    3: c3 ret
    Code; c0198452 <object_depth+12/20>
    4: 8d b4 26 00 00 00 00 lea 0x0(%esi),%esi
    Code; c0198459 <object_depth+19/20>
    b: 8d bc 27 00 00 00 00 lea 0x0(%edi),%edi
    Code; c0198460 <object_path_length+0/30>
    12: 55 push %ebp
    Code; c0198461 <object_path_length+1/30>
    13: 89 e5 mov %esp,%ebp
    Code; c0198463 <object_path_length+3/30>
    15: 57 push %edi
    Code; c0198464 <object_path_length+4/30>
    16: 56 push %esi
    Code; c0198465 <object_path_length+5/30>
    17: 8b 55 08 mov 0x8(%ebp),%edx
    Code; c0198468 <object_path_length+8/30>
    1a: be 01 00 00 00 mov $0x1,%esi
    Code; c019846d <object_path_length+d/30>
    1f: 53 push %ebx
    Code; c019846e <object_path_length+e/30>
    20: 31 db xor %ebx,%ebx
    Code; c0198470 <object_path_length+10/30>
    22: 8b 3a mov (%edx),%edi
    Code; c0198472 <object_path_length+12/30>
    24: b9 ff ff ff ff mov $0xffffffff,%ecx
    Code; c0198477 <object_path_length+17/30>
    29: 89 d8 mov %ebx,%eax

    This decode from eip onwards should be reliable

    Code; c0198479 <object_path_length+19/30>
    00000000 <_EIP>:
    Code; c0198479 <object_path_length+19/30> <=====
    0: f2 ae repnz scas %es:(%edi),%al <=====
    Code; c019847b <object_path_length+1b/30>
    2: f7 d1 not %ecx
    Code; c019847d <object_path_length+1d/30>
    4: 49 dec %ecx
    Code; c019847e <object_path_length+1e/30>
    5: 8b 52 24 mov 0x24(%edx),%edx
    Code; c0198481 <object_path_length+21/30>
    8: 8d 74 31 01 lea 0x1(%ecx,%esi,1),%esi
    Code; c0198485 <object_path_length+25/30>
    c: 85 d2 test %edx,%edx
    Code; c0198487 <object_path_length+27/30>
    e: 75 e7 jne fffffff7 <_EIP+0xfffffff7>
    Code; c0198489 <object_path_length+29/30>
    10: 5b pop %ebx
    Code; c019848a <object_path_length+2a/30>
    11: 89 f0 mov %esi,%eax
    Code; c019848c <object_path_length+2c/30>
    13: 5e pop %esi
    Code; c019848d <object_path_length+2d/30>
    14: 5f pop %edi
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      Last update: 2005-04-06 13:30    [W:0.028 / U:32.212 seconds]
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