Kernel panics -> possible memory corruption?

[José Luis Gómez Dans <nospam [at] sheffield.ac.uk>]

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	I have posted referring to this in the past, but didn't get a
full answer. However, tenacious as one is, I kept on trying... Here's
the problem: I do get intermittent crashes on the system, namely kernel
panics due to the kernel not being able to de-referencea NULL pointer,
or kernel not being able to handle paging requests. Programs tend to
segfault and  provide me with a kernel panics and OOPS.

	Now, it all looks like the memory might be buggered somehow.
However, I ran memtest86, and it seems to be fine (i.e., it reports no
errors). Also, it might be the swap that's knackered (I haven't tested
this one yet). Here's one of the kernel panix that effectively went into
the logs:

Apr 13 14:05:15 faust kernel: Unable to handle kernel NULL pointer derefere=
nce at virtual address 00000008
Apr 13 14:05:15 faust kernel: current->tss.cr3 =3D 01566000, %cr3 =3D 01566=
000
Apr 13 14:05:15 faust kernel: *pde =3D 00000000
Apr 13 14:05:15 faust kernel: Oops: 0000
Apr 13 14:05:15 faust kernel: CPU:    0
Apr 13 14:05:15 faust kernel: EIP:    0010:[sock_poll+7/36]
Apr 13 14:05:15 faust kernel: EFLAGS: 00010286
Apr 13 14:05:15 faust kernel: eax: 00000000   ebx: c2cc0580   ecx: 00000145=
   edx: c32c6960
Apr 13 14:05:15 faust kernel: esi: c32c6960   edi: 00000002   ebp: c1142000=
   esp: c1565f70
Apr 13 14:05:15 faust kernel: ds: 0018   es: 0018   ss: 0018
Apr 13 14:05:15 faust kernel: Process xmms (pid: 471, process nr: 29, stack=
page=3Dc1565000)
Apr 13 14:05:15 faust kernel: Stack: c1142000 00000002 081cefe8 00000018 c2=
cc0570 c1564000 c1564000 00000000=20
Apr 13 14:05:15 faust kernel:        c012fcd8 00000003 c2cc0570 c1142000 00=
000002 c1564000 00000001 081cefe8=20
Apr 13 14:05:15 faust kernel:        bffffa3c c1142000 c1142000 fffffff2 c0=
109ccc 081cefe8 00000003 00000001=20
Apr 13 14:05:15 faust kernel: Call Trace: [sys_poll+244/364] [system_call+5=
2/56]=20
Apr 13 14:05:15 faust kernel: Code: 8b 40 08 05 9c 00 00 00 8b 48 08 ff 74 =
24 08 50 52 8b 41 20=20
Apr 13 14:05:15 faust kernel: VFS: Close: file count is 0
=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=
=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=
=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=
=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=
=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=
=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00=00Apr 13=
 14:10:17 faust syslogd 1.3-3#33: restart.


	The last message (just before the " [at] "s) varies. This is one of
the many flavours I get. As I said before, I believe my memory to be
faulty, or my hard drive to be not in order. It happens with all sorts
of kernels (2.2.12-onwards). I also get a number of "internal compiler
errors" (error 11) (which again suggests a memory problem).

	My system:
	AMD K7 550MHz
	WS-6167 MoBo
	64 Megs RAM

	My question is to see whether anyone has some ideas on things I
can do to make sure that it is either the memory of the HD. Any hints?

	Thanks,
	Jos=E9

--=20
Jos=E9 L G=F3mez Dans			PhD student
					Radar & Communications Group
					Department of Electronic Engineering
					University of Sheffield UK
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