Re: system-freeze: kprobe and do_gettimeofday

Prasanna S Panchamukhi
2005-04-29T11:18:54Z

Juergen,

>
> I did now a lot of additional tests. When running
> "insmod kgettime.ko" from the console (not from x-windows)
> I get:
>
> kprobe registered address c0107bd0 // output from the module
> double fault, gdt at c049bd00 [255 bytes]
> double fault, tss at c03d4060
> eip = c0103c86, esp = db932000
> eax = ffffffff, ebx = db932134, ecx = 0000000d, edx = 00000000
> esi = db932080, edi = 0000000d
>
> Alt+SysRq did not work...
>
> Then I removed all my modules (except 2) I was able to load the module
> without problems. I added module by module and checked every time with
> "insmod kgettime.ko". When loading the "ohci1394" module it crashed
> again. But next time I loaded the "ohci"-module first - no crash. (So I
> don't think it is the ohci-module). I was able to load all modules and
> it still worked.
>
> Hmmm. What else to check?
>
Thanks for providing the information, we are not able to reproduce this
problem here. Can you pls write a similar fault handler for kprobes as shown
below and get us the log messages.

int fault_probe(struct kprobe *p, struct pt_regs *regs, int trapnr) {
printk("fault_handler:p->addr=0x%p, eflags=0x%lx\n", p->addr, regs->eflags);
return 0;
}

Thanks
Prasanna

--

Prasanna S Panchamukhi
Linux Technology Center
India Software Labs, IBM Bangalore
Ph: 91-80-25044636
<prasanna@in.ibm.com>