Re: Re: [Xen-users] XEN 3.0.3 on Ubuntu 6.10: Dom0 reboot]

[PUCCETTI Armand <armand.puccetti@cea.fr>]

The function vprintk is concerned, as the trace contains:

ffffffff80129fb0 <vprintk>:
ffffffff80129fb0:    55                       push   %rbp
ffffffff80129fb1:    48 89 e5                 mov    %rsp,%rbp
ffffffff80129fb4:    41 57                    push   %r15
ffffffff80129fb6:    41 56                    push   %r14
ffffffff80129fb8:    41 55                    push   %r13
ffffffff80129fba:    41 54                    push   %r12
ffffffff80129fbc:    53                       push   %rbx
ffffffff80129fbd:    48 83 ec 58              sub    $0x58,%rsp
ffffffff80129fc1:    44 8b 1d 38 c1 51 00     mov    
5357880(%rip),%r11d        # ffffffff80646100 <oops_in_progress>
ffffffff80129fc8:    64 48 8b 04 25 28 00     mov    %fs:0x28,%rax      
                          
ffffffff80129fcf:    00 00
ffffffff80129fd1:    48 89 45 c8              mov    
%rax,0xffffffffffffffc8(%rbp)
ffffffff80129fd5:    31 c0                    xor    %eax,%eax
ffffffff80129fd7:    45 85 db                 test   %r11d,%r11d
ffffffff80129fda:    74 68                    je     ffffffff8012a044 
<vprintk+0x94>
ffffffff80129fdc:    8b 05 ea 8c 3e 00        mov    
4099306(%rip),%eax        # ffffffff80512ccc <printk_cpu>
ffffffff80129fe2:    85 c0                    test   %eax,%eax
ffffffff80129fe4:    75 5e                    jne    ffffffff8012a044 
<vprintk+0x94>
ffffffff80129fe6:    48 8b 05 13 e2 4a 00     mov    
4907539(%rip),%rax        # ffffffff805d8200 <jiffies>
ffffffff80129fed:    48 8b 15 2c c5 51 00     mov    
5358892(%rip),%rdx        # ffffffff80646520 <oops_timestamp.17285>

Now, that should correspond to source code:

asmlinkage int vprintk(const char *fmt, va_list args)
{
    unsigned long flags;
    int printed_len;
    char *p;
    static char printk_buf[1024];
    static int log_level_unknown = 1;

    preempt_disable();
    if (unlikely(oops_in_progress) && printk_cpu == smp_processor_id())
        /* If a crash is occurring during printk() on this CPU,
         * make sure we can't deadlock */
        zap_locks();

which isn't so much clearer to me...

Keir Fraser a écrit :
>
> On 3/1/07 11:04, "PUCCETTI Armand" <armand.puccetti@cea.fr> wrote:
>
>   
>> I removed both options but exactly the same trace comes out.
>> Are there any other options I should add?
>>
>> Armand
>>     
>
> You could add 'debug' as a boot parameter, but it looks like you are
> crashing too early to get any output. Have you tried disassembling the Linux
> kernel image (objdump -d vmlinux) and see what function contains address
> ffffffff80129fc8 (the crashing RIP value)?
>
>  -- Keir
>
>
>