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    SubjectRe: 2.2.9 crash.....again
    Date
    Mike Galbraith writes the following:
    >
    >> kmem_free: Bad obj addr (objp = c4110b80, name = size-128)
    >> Unable to handle kernel NULL pointer dereference at virtual address 00000000
    >> *pde = 00000000
    >> Oops: 0002

    I got one like this too, on 2.2.3, but the machine didn't crash. Nobody even
    noticed until we went to the console a few days laster and saw it on the
    screen.

    kmem_free: Bad obj addr (objp=cf83b080, name=uid_cache)
    Unable to handle kernel NULL pointer dereference at virtual address 00000000
    current->tss.cr3 = 06567000, %cr3 = 06567000
    *pde = 00000000
    Oops: 0002
    CPU: 0
    EIP: 0010:[<c0121b97>]
    EFLAGS: 00010282
    eax: 0000003b ebx: c009e560 ecx: c61f4000 edx: cf8ea000
    esi: cf83b080 edi: 00000282 ebp: 00000000 esp: c61f5f68
    ds: 0018 es: 0018 ss: 0018
    Process qmail-lspawn (pid: 31727, process nr: 77, stackpage=c61f5000)
    Stack: 00007bf2 00000000 c094a420 cf83b09c 00000000 c0112ad7 c009e560 cf83b080
    c011715e c6a8c000 c6a8c000 c0117cf6 c6a8c000 c61f4000 00000000 0000000c
    bffffccc c0d9c000 c61f4000 c61f4000 c61f4000 c61f408c c0107aec 00007bf2
    Call Trace: [<c0112ad7>] [<c011715e>] [<c0117cf6>] [<c0107aec>]
    Code: c7 05 00 00 00 00 00 00 00 00 5b 5e 5f 5d 83 c4 0c c3 8d 76

    >>EIP: c0121b97 <kmem_cache_free+17b/19c>
    Trace: c0112ad7 <free_uid+5b/60>
    Trace: c011715e <release+42/16c>
    Trace: c0117cf6 <sys_wait4+2e6/39c>
    Trace: c0107aec <system_call+34/38>
    Code: c0121b97 <kmem_cache_free+17b/19c> 00000000 <_EIP>:
    Code: c0121b97 <kmem_cache_free+17b/19c> 0: c7 05 00 00 00 movl $0x0,0x0
    Code: c0121b9c <kmem_cache_free+180/19c> 5: 00 00 00 00 00
    Code: c0121ba1 <kmem_cache_free+185/19c> a: 5b popl %ebx
    Code: c0121ba2 <kmem_cache_free+186/19c> b: 5e popl %esi
    Code: c0121ba3 <kmem_cache_free+187/19c> c: 5f popl %edi
    Code: c0121ba4 <kmem_cache_free+188/19c> d: 5d popl %ebp
    Code: c0121ba5 <kmem_cache_free+189/19c> e: 83 c4 0c addl $0xc,%esp
    Code: c0121ba8 <kmem_cache_free+18c/19c> 11: c3 ret
    Code: c0121ba9 <kmem_cache_free+18d/19c> 12: 8d 76 00 leal 0x0(%esi),%esi

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