crash version 4.0-3.9 is available

On Wed, Nov 08, 2006 at 10:51:00AM -0500, Dave Anderson
wrote:
> Rachita Kothiyal wrote:
> 
> >
> > > If "crash --machdep irq_eframe_link=40
..." works, then
> > > something in x86_64_irq_eframe_link_init()
needs to be
> > > looked at.
> >
> > Hi Dave
> >
> > The dis common_interrupt looks exactly like above
and with the
> > --machdep irq_eframe_link=40 in the commandline I
dont see the bogus
> > frames in the bt.
> >
> > Thanks
> > Rachita
> >
> 
> Right -- so you'll have to debug
x86_64_irq_eframe_link_init().
> and figure out why it's failing to make it to the
bottom, where
> the link gets initialized.

Hi Dave

It turns out that the column width of the window I was
running crash on was the problem! With a width of 80, the
instruction at <common_interrupt+49> seems to
be wrapped around. This was causing incomplete instruction
getting read into 
the buffer on a fgets in x86_64_irq_eframe_link_init(). It
wasnt reaching
till the 'push rbp' instruction at all and this left the
irq_eframe_link
uninitialised. On increasing the column size it worked fine.

crash> dis common_interrupt
0xffffffff80109b34 <common_interrupt>:  cld
0xffffffff80109b35 <common_interrupt+1>:        sub   
$0x48,%rsp
0xffffffff80109b39 <common_interrupt+5>:        mov   
%rdi,0x40(%rsp)
0xffffffff80109b3e <common_interrupt+10>:       mov   
%rsi,0x38(%rsp)
0xffffffff80109b43 <common_interrupt+15>:       mov   
%rdx,0x30(%rsp)
0xffffffff80109b48 <common_interrupt+20>:       mov   
%rcx,0x28(%rsp)
0xffffffff80109b4d <common_interrupt+25>:       mov   
%rax,0x20(%rsp)
0xffffffff80109b52 <common_interrupt+30>:       mov   
%r8,0x18(%rsp)
0xffffffff80109b57 <common_interrupt+35>:       mov   
%r9,0x10(%rsp)
0xffffffff80109b5c <common_interrupt+40>:       mov   
%r10,0x8(%rsp)
0xffffffff80109b61 <common_interrupt+45>:       mov   
%r11,(%rsp)
0xffffffff80109b65 <common_interrupt+49>:
    lea    0xffffffffffffffd0(%rsp),%rdi
0xffffffff80109b6a <common_interrupt+54>:       push  
%rbp
0xffffffff80109b6b <common_interrupt+55>:       mov   
%rsp,%rbp


Thanks
Rachita

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