Got hold of one of these machines in this "everything is exploding"
state. Used the below test program to dump out the static variables and
obtain the alignment of the corruption. (This program does not
manipulate this data which eliminates a bug in dpkg as cause.) Note
that the corruption is at the start of the page (and although most
elided here repeats on each page thereafter):
===
#include <stdio.h>
static char b[65536 * 16];
main(int argc, char *argv[])
{
int p;
printf("%08lx\n", (long)b);
for (p = 0; p < sizeof(b); p++) {
if (b[p]) {
printf("%d != 0 @ %d [%08lx]\n", b[p], p, (long)&b[p]);
}
}
}
===
10011068
68 != 0 @ 61336 [10020000]
20 != 0 @ 61340 [10020004]
2 != 0 @ 61342 [10020006]
1 != 0 @ 61344 [10020008]
75 != 0 @ 61348 [1002000c]
3 != 0 @ 61349 [1002000d]
2 != 0 @ 61352 [10020010]
8 != 0 @ 61353 [10020011]
[...]
68 != 0 @ 126872 [10030000]
20 != 0 @ 126876 [10030004]
2 != 0 @ 126878 [10030006]
1 != 0 @ 126880 [10030008]
75 != 0 @ 126884 [1003000c]
3 != 0 @ 126885 [1003000d]
2 != 0 @ 126888 [10030010]
8 != 0 @ 126889 [10030011]
[...]
===
I also dumped the corruption in full in a more readable form, I would
note that this seems to contain 'lo' and 'eth0' as if it were networking
related:
===
000000 0044 0000 0014 0002 0001 0000 034b 0000
D \0 \0 \0 024 \0 002 \0 001 \0 \0 \0 K 003 \0 \0
000010 0802 fe80 0001 0000 0008 0001 007f 0100
002 \b 200 376 001 \0 \0 \0 \b \0 001 \0 177 \0 \0 001
000020 0008 0002 007f 0100 0007 0003 6f6c 0000
\b \0 002 \0 177 \0 \0 001 \a \0 003 \0 l o \0 \0
000030 0014 0006 ffff ffff ffff ffff bb72 0054
024 \0 006 \0 377 377 377 377 377 377 377 377 r 273 T \0
000040 bb72 0054 0050 0000 0014 0002 0001 0000
r 273 T \0 P \0 \0 \0 024 \0 002 \0 001 \0 \0 \0
000050 034b 0000 1802 0080 000c 0000 0008 0001
K 003 \0 \0 002 030 200 \0 \f \0 \0 \0 \b \0 001 \0
000060 000a 8203 0008 0002 000a 8203 0008 0004
\n \0 003 202 \b \0 002 \0 \n \0 003 202 \b \0 004 \0
000070 000a ff03 0009 0003 7465 3068 0000 0000
\n \0 003 377 \t \0 003 \0 e t h 0 \0 \0 \0 \0
000080 0014 0006 ffff ffff ffff ffff bcc8 0054
024 \0 006 \0 377 377 377 377 377 377 377 377 310 274 T \0
000090 bcc8 0054 0000 0000 0000 0000 0000 0000
310 274 T \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0
0000a0 0000 0000 0000 0000 0000 0000 0000 0000
\0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0
*
010000 0044 0000 0014 0002 0001 0000 034b 0000
===
I should note at this point that this differs from the corruption as
seen by @vorlon which showed a single bit change in each page.
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Title:
kernel crash: Unable to handle kernel paging request for data
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