Re: system-freeze: kprobe and do_gettimeofday

From: Prasanna S Panchamukhi (prasanna_at_in.ibm.com)
Date: 04/29/05

  • Next message: crow_at_old-fsckful.ath.cx: "Re: system reboot after reading /proc/acpi/battery/../state" 
    Date:	Fri, 29 Apr 2005 16:48:49 +0530
To: Juergen Quade <quade@hsnr.de>

    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>
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