Re: syscall.open

[Wenji Huang <wenji dot huang at oracle dot com>]

Marcin Krol wrote:

> Hello everyone,
>
> Anybody knows why this tutorial example can't run?
>
> probe syscall.open
> {
>  printf ("%s(%d) open (%s)\n", execname(), pid(), argstr)
> }
> probe timer.ms(4000) # after 4 seconds
> {
>  exit ()
> }
>
>
> I took care to include following flags in kernel  .config:
>
> CONFIG_KPROBES=y
> CONFIG_DEBUG_INFO=y
> CONFIG_RELAY=y
> CONFIG_DEBUG_FS=y
>
> CONFIG_DEBUG_KERNEL=y
>
> I get this error:
>
> % stap strace-open.stp
> semantic error: libdwfl failure (missing kernel debuginfo): No such 
> file or directory while resolving probe


Regarding self-built kernel, vmlinux need to be placed on the locations 
systemtap can find. From src/README

- Systemtap looks for the debug info in these locations:
 /boot/vmlinux-`uname -r`
 /usr/lib/debug/lib/modules/`uname -r`/vmlinux
 /lib/modules/`uname -r`/vmlinux

Regards,
Wenji