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    SubjectRe: OOPS with 2.1.92
    On Sun, 5 Apr 1998, Jason Burrell wrote:

    >
    >I managed to get a NULL pointer dereference in the kernel. It occured
    >while doing a system update under Debian's package manager. The AMD script
    >segfaulted, the error appeared, and all went on as normal from there.
    >
    >
    >Setting up amd (upl102-22) ...
    >Using existing AMD configuration.
    >/etc/init.d/amd: line 2: 5919 Segmentation fault start-stop-daemon
    >--test --stop --exec /usr/sbin/amd >/dev/null 2>&1
    >Starting automounter: amd.
    >
    >Line two in /etc/init.d/amd is blank. Line one is the shell specifier
    >(i.e. "#!/bin/sh").
    >
    >Unable to handle kernel NULL pointer dereference at virtual address
    >00000008
    >current->tss.cr3 = 00638000, %cr3 = 00638000
    >*pde = 00000000
    >Oops: 0000
    >CPU: 0
    >EIP: 0010:[<c013ea19>]
    >EFLAGS: 00010286
    >eax: 00000000 ebx: 171d0007 ecx: c3fd79a0 edx: 0000171d
    >esi: 00000001 edi: c11ef5e0 ebp: c11ef5e0 esp: c1ab3f24
    >ds: 0018 es: 0018 ss: 0018
    >Process start-stop-daem (pid: 5919, process nr: 10, stackpage=c1ab3000)
    >Stack: 0000a1c0 c012abe0 c2f0e7e0 00000001 c2f0e7e0 c1c8c480 c0140217
    >c2f0e7e0
    > 00000001 c11ef5e0 c1ab2000 c1c8c480 c012ae27 c1c8c480 c11ef5e0
    >c1c8c480
    > c1c8c480 c22bd00e c012aff9 c11ef5e0 c1c8c480 c22bd000 bffffbb4
    >08048950
    >Call Trace: [<c012abe0>] [<c0140217>] [<c012ae27>] [<c012aff9>]
    >[<c012b058>] [<c0129006>] [<c01098b8>]
    >Code: 8b 40 08 85 c0 75 08 eb 1a 89 f6 31 c0 eb 19 39 c8 74 f8 8b
    >
    >(root) <~>$ ksymoops /System.map < oops
    >Using `/System.map' to map addresses to symbols.
    >
    >>>EIP: c013ea19 <proc_permission+71/9c>
    >Trace: c012abe0 <permission+24/f0>
    >Trace: c0140217 <proc_follow_link+1b/118>
    >Trace: c012ae27 <do_follow_link+43/84>
    >Trace: c012aff9 <lookup_dentry+191/1c4>
    >Trace: c012b058 <__namei+2c/80>
    >Trace: c0129006 <sys_newstat+e/64>
    >Trace: c01098b8 <system_call+38/40>
    >Code: c013ea19 <proc_permission+71/9c>
    >Code: c013ea19 <proc_permission+71/9c> 8b 40 08 movl
    >0x8(%eax),%eax
    >Code: c013ea1c <proc_permission+74/9c> 85 c0 testl %eax,%eax
    >Code: c013ea1e <proc_permission+76/9c> 75 08 jne c013ea28
    ><proc_permission+80/9c>
    >Code: c013ea20 <proc_permission+78/9c> eb 1a jmp c013ea3c
    ><proc_permission+94/9c>
    >Code: c013ea22 <proc_permission+7a/9c> 89 f6 movl %esi,%esi
    >Code: c013ea2a <proc_permission+82/9c> 31 c0 xorl %eax,%eax
    >Code: c013ea2c <proc_permission+84/9c> eb 19 jmp c013ea41
    ><proc_permission+99/9c>
    >Code: c013ea2e <proc_permission+86/9c> 39 c8 cmpl %ecx,%eax
    >Code: c013ea30 <proc_permission+88/9c> 74 f8 je c013ea24
    ><proc_permission+7c/9c>
    >Code: c013ea32 <proc_permission+8a/9c> 8b 00 movl (%eax),%eax
    >Code: c013ea3a <proc_permission+92/9c> 90 nop
    >Code: c013ea3b <proc_permission+93/9c> 90 nop
    >Code: c013ea3c <proc_permission+94/9c> 90 nop
    >
    >
    I *sometimes* get the same thing except it's caused by 'killall5' during
    shutdown or reboot... not a fun thing having your kernel OOPS during shutdown :)
    It too was caused by the same code that caused that one... I think procfs
    might need to be examined.
    >
    >-
    >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    >the body of a message to majordomo@vger.rutgers.edu
    >

    --------------------------------------------------------------------------
    Sean M. Kelly | Bill Gates must truly be a genius to successfully
    smkelly@zombie.org | market so many programming failures.
    --------------------------------------------------------------------------


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