Unable to handle kernel paging request at virtual address
This is usually accompanied by an oops in the syslog:
Jan 17 11:22:47 bass kernel: Unable to handle kernel paging request at virtual address 00040008
Jan 17 11:22:47 bass kernel: printing eip:
Jan 17 11:22:47 bass kernel: c01283f9
Jan 17 11:22:47 bass kernel: *pde = 00000000
Jan 17 11:22:47 bass kernel: Oops: 0000
Jan 17 11:22:47 bass kernel: CPU: 0
Jan 17 11:22:47 bass kernel: EIP: 0010:[<c01283f9>] Not tainted
Jan 17 11:22:47 bass kernel: EFLAGS: 00010206
Jan 17 11:22:47 bass kernel: eax: 00040000 ebx: ef96f434 ecx: 00000013 edx: 000173a2
Jan 17 11:22:47 bass kernel: esi: 00000001 edi: 00000280 ebp: f7a5ce88 esp: e0a07ec4
Jan 17 11:22:47 bass kernel: ds: 0018 es: 0018 ss: 0018
Jan 17 11:22:47 bass kernel: Process rpm (pid: 10456, stackpage=e0a07000)
Jan 17 11:22:47 bass kernel: Stack: f659c600 00000280 00000001 0000027e f659c600 c0128aa7 0000001f 00000002
Jan 17 11:22:47 bass kernel: 000009ea f659c600 c1e92c10 ef96f434 0000027e c0128e03 00000000 f659c600
Jan 17 11:22:47 bass kernel: ef96f380 c1e92c10 00001000 00000000 00000000 00000000 ef96f380 e0a06000
Jan 17 11:22:47 bass kernel: Call Trace: [<c0128aa7>] [<c0128e03>] [<c0129378>] [<c0129220>] [<c013704e>]
Jan 17 11:22:47 bass kernel: [<c0126429>] [<c0114740>] [<c0108853>]
Jan 17 11:22:47 bass kernel:
Jan 17 11:22:47 bass kernel: Code: 39 58 08 75 f4 39 78 0c 75 ef 85 c0 75 52 8b 43 2c 31 d2 e8
In this case, triggered by trying to
rpm -e mrtg.
While the web goes on and on about how it is related to this kernel or that kernel, I have two identical systems, one of which oops-es and one which doesn't. If you dig on the web long enough, you'll get the feel that hardware (in my case, most likely memory of some kind) is at fault.