I've got a back trace : sysrq: show backtrace of all active cpus cpu0: pid: 0,comm : swapper not tainted (2.6.31.2#1) m3n EIP: 0060 : [<c0668706>] EFLAGS: 00000246 cpu :0 EIP is at acpi_idle_enter_simple+0x11d/0x161 EAX: 00000000 EBX: 0000095e ECX: 00000007 EDX: 9640cf68 ESI: 00000000 EDI: f6d7ad5c EBP: c09dff48 ESP: c09dff24 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 CR0: 8005003b CR2: 084511e4 CR3: 00c2e000 CR4: 000006d0 DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 DR6: ffff0ff0 DR7: 00000400 Call Trace: [<c066842f>] acpi_idle_enter_bm+0xd2/0x28c [<c075692a>] ? menu_select+0x48/0xc2 [<c0755a36>] cpu_idle_call+0x73/0xbd [<c040286c>] cpu_idle+0xac/0xcc [<c080a62a>] rest_init+0x66/0x79 [<c0a71a6b>] start_kernel+036f/0x385 [<c0a7107e>] i386_start_kernel+0x7e/0x96 I had to copy it onto paper and then type it out but it should be accurate. It caused the kernel to crash.
Created attachment 23369 [details] dmidecode
Created attachment 23370 [details] lspci
Hi, Tony Will you please describe the back-trace more clearly? For example: how to trigger it? It will be great if you can attach the output of dmesg when the oops happens. thanks.
re-assign to venki. :)
ping Venki....
The message looks to be coming from sysrq handler (drivers/char/sysrq.c) for sysrq magic + l. I don't see anything wrong with the log. Tony, did you see this during boot? or something during runtime to trigger it?
Booting off a usb stick. I can't really add much more than that, it was a while ago and I don't even think the latest Linux kernels boot to X on this machine any more, so wouldn't be able to try to reproduce it. It's not a testing machine. I've seen at least one regression per release over the last year on this machine which went from running Linux flawlessly to just about with a lot of work, therefore I've stopped tracking the Linux kernel on this machine. For now, the machine is pretty much a won't fix.
OK. Closing the bug as UNREPRODUCIBLE for now. Feel free to reopen if you see this problem again either on same or on any other systems.