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    SubjectRe: 2.4.19 OOPS [Repost]
    Just in case this had someone wondering, the problem was swap
    corruption. I did an mkswap on the swap partition, and it doesn't
    OOPS anymore.

    The OOPS was at vmscan.c:506 (Bad EIP=200)

    On Tue, Sep 03, 2002 at 07:07:26PM +0200, lists@corewars.org wrote:
    > Hi,
    >
    > I'm getting regular oopses that can be easily reproduced with a
    > [dd if=/dev/zero of=~/boo bs=4096 count=100000] on my
    > Compaq Armada M700/PIII/750MHZ with 256MB RAM with more than 3GB free
    > on /home. /home is on ext2, /tmp on tmpfs, with a 500 MB swap partition.
    >
    > This is with the 2.4.19 stock kernel.
    >
    > Regards,
    > Sapan
    >
    >
    > Unable to handle kernel NULL pointer dereference at virtual address 00000100
    > 00000100
    > *pde = 00000000
    > Oops: 0000
    > CPU: 0
    > EIP: 0010:[<00000100>] Not tainted
    > Using defaults from ksymoops -t elf32-i386 -a i386
    > EFLAGS: 00010202
    > eax: 00000001 ebx: c0315420 ecx: 00000001 edx: d081c000
    > esi: 00000001 edi: 0000001e ebp: 00002480 esp: c12f5f28
    > ds: 0018 es: 0018 ss: 0018
    > Process kswapd (pid: 4, stackpage=c12f5000)
    > Stack: c108eff0 c012a313 c0315420 00000000 c12f4000 00000172 000001d0 c02b6e54
    > c12c72f0 caa9e028 c12c5420 00000000 00000020 000001d0 00000006 0001bcd8
    > c012a498 00000006 00000000 c02b6e54 00000006 000001d0 c02b6e54 00000000
    > Call Trace: [<c012a313>] [<c012a498>] [<c012a4fc>] [<c012a5a1>] [<c012a616>]
    > [<c012a751>] [<c012a6b0>] [<c010708b>]
    > Code: Bad EIP value.
    >
    >
    > >>EIP; 00000100 Before first symbol <=====
    >
    > >>ebx; c0315420 <swap_info+0/700>
    > >>edx; d081c000 <_end+104e3f3c/10525f3c>
    > >>ebp; 00002480 Before first symbol
    > >>esp; c12f5f28 <_end+fbde64/10525f3c>
    >
    > Trace; c012a313 <shrink_cache+2c3/300>
    > Trace; c012a498 <shrink_caches+58/80>
    > Trace; c012a4fc <try_to_free_pages+3c/60>
    > Trace; c012a5a1 <kswapd_balance_pgdat+51/a0>
    > Trace; c012a616 <kswapd_balance+26/40>
    > Trace; c012a751 <kswapd+a1/c0>
    > Trace; c012a6b0 <kswapd+0/c0>
    > Trace; c010708b <kernel_thread+2b/40>
    >
    > <1>Unable to handle kernel NULL pointer dereference at virtual address 00000200
    > 00000200
    > *pde = 00000000
    > Oops: 0000
    > CPU: 0
    > EIP: 0010:[<00000200>] Not tainted
    > EFLAGS: 00010202
    > eax: 00000001 ebx: c0315420 ecx: 00000002 edx: d081c000
    > esi: 00000002 edi: 00000020 ebp: 000024f7 esp: cabdfe70
    > ds: 0018 es: 0018 ss: 0018
    > Process bunzip2 (pid: 792, stackpage=cabdf000)
    > Stack: c11e6988 c012a313 c0315420 00000000 cabde000 0000018d 000001d2 c02b6e54
    > c12c72f0 cd0f7034 c12c71a0 00000001 00000020 000001d2 00000006 0001c110
    > c012a498 00000006 00000000 c02b6e54 00000006 000001d2 c02b6e54 00000000
    > Call Trace: [<c012a313>] [<c012a498>] [<c012a4fc>] [<c012ae89>] [<c012b11b>]
    > [<c01267bf>] [<c010cfa1>] [<c0130ba6>] [<c01182dd>] [<c0109dbe>] [<c0108857>]
    > Code: Bad EIP value.
    >
    >
    > >>EIP; 00000200 Before first symbol <=====
    >
    > >>ebx; c0315420 <swap_info+0/700>
    > >>edx; d081c000 <_end+104e3f3c/10525f3c>
    > >>ebp; 000024f7 Before first symbol
    > >>esp; cabdfe70 <_end+a8a7dac/10525f3c>
    >
    > Trace; c012a313 <shrink_cache+2c3/300>
    > Trace; c012a498 <shrink_caches+58/80>
    > Trace; c012a4fc <try_to_free_pages+3c/60>
    > Trace; c012ae89 <balance_classzone+59/1d0>
    > Trace; c012b11b <__alloc_pages+11b/180>
    > Trace; c01267bf <generic_file_write+42f/730>
    > Trace; c010cfa1 <timer_interrupt+71/120>
    > Trace; c0130ba6 <sys_write+96/f0>
    > Trace; c01182dd <do_softirq+4d/90>
    > Trace; c0109dbe <do_IRQ+9e/b0>
    > Trace; c0108857 <system_call+33/38>
    >
    > <1>Unable to handle kernel paging request at virtual address 00006c00
    > 00006c00
    > *pde = 00000000
    > Oops: 0000
    > CPU: 0
    > EIP: 0010:[<00006c00>] Not tainted
    > EFLAGS: 00010202
    > eax: 00000001 ebx: c0315420 ecx: 0000006c edx: d081c000
    > esi: 0000006c edi: 00000006 ebp: 00002504 esp: c9c83e70
    > ds: 0018 es: 0018 ss: 0018
    > Process bunzip2 (pid: 831, stackpage=c9c83000)
    > Stack: c12056a4 c012a313 c0315420 00000073 c9c82000 000001c5 000001d2 c02b6e54
    > c0132beb 00000306 c12c7520 00000000 00000020 000001d2 00000006 0001c086
    > c012a498 00000006 00000000 c02b6e54 00000006 000001d2 c02b6e54 00000000
    > Call Trace: [<c012a313>] [<c0132beb>] [<c012a498>] [<c012a4fc>] [<c012ae89>]
    > [<c012b11b>] [<c01267bf>] [<c0130ba6>] [<c0108857>]
    > Code: Bad EIP value.
    >
    >
    > >>EIP; 00006c00 Before first symbol <=====
    >
    > >>ebx; c0315420 <swap_info+0/700>
    > >>edx; d081c000 <_end+104e3f3c/10525f3c>
    > >>ebp; 00002504 Before first symbol
    > >>esp; c9c83e70 <_end+994bdac/10525f3c>
    >
    > Trace; c012a313 <shrink_cache+2c3/300>
    > Trace; c0132beb <unmap_underlying_metadata+1b/60>
    > Trace; c012a498 <shrink_caches+58/80>
    > Trace; c012a4fc <try_to_free_pages+3c/60>
    > Trace; c012ae89 <balance_classzone+59/1d0>
    > Trace; c012b11b <__alloc_pages+11b/180>
    > Trace; c01267bf <generic_file_write+42f/730>
    > Trace; c0130ba6 <sys_write+96/f0>
    > Trace; c0108857 <system_call+33/38>
    >
    >
    >
    > -
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