Re: semantic error

[domenico dot dileo at unina dot it]

Dear Frank,
Despite your suggestion of removing the @FILE part
from the probe point command, I still receive the same
error.
Hereafter, there are some errors prompted by systemtap
when the option --vp 3 is enabled.

parse 'setup_fail_slab@mm/slab.c', func 'setup_fail_slab', file 'mm/slab.c'
focused on module 'kernel' = [0x0xc0100000, -0x0xc07bd000, bias 0x0  
file /lib/modules/2.6.24-FNM_v2.1/build/vmlinux ELF machine i?86|  
(code 3)
focused on module 'kernel'
selected source file 'mm/slab.c'
semantic error: no match while resolving probe point  
kernel.function("setup_fail_slab@mm/slab.c").call
parse 'setup_fail_slab@mm/slab.c', func 'setup_fail_slab', file 'mm/slab.c'
focused on module 'kernel' = [0x0xc0100000, -0x0xc07bd000, bias 0x0  
file /lib/modules/2.6.24-FNM_v2.1/build/vmlinux ELF machine i?86|  
(code 3)
focused on module 'kernel'
selected source file 'mm/slab.c'
semantic error: no match while resolving probe point  
kernel.function("setup_fail_slab@mm/slab.c").return
parse 'should_fail_alloc_page@mm/page_alloc.c', func  
'should_fail_alloc_page', file 'mm/page_alloc.c'
focused on module 'kernel' = [0x0xc0100000, -0x0xc07bd000, bias 0x0  
file /lib/modules/2.6.24-FNM_v2.1/build/vmlinux ELF machine i?86|  
(code 3)



Quoting "Frank Ch. Eigler" <fche@redhat.com>:

> Hi, Domenico -
>
> domenico.dileo wrote:
>
> > I would like to set a probe point for the following functions:
> > [...]
> > should_fail_request@block/ll_rw_blk.c
> > should_fail_slab@mm/slab.c
> > fail_slab_debug_fs@mm/slab.c
> > [...]
> > in order to assign a probe to them, I use the command
> > probe kernel.function("fail_make_request_debugfs@block/ll_rw_blk.c").call
> > [...]
>
> Try just
>     kernel.function("fail_make_request_debugfs").call
> and so on (drop the @FILE part), just in case that's not quite right.
> Try
>     stap --vp 03 -e 'probe ....'
> to get way more information about stap's processing of the probe points.
>
> - FChE



Domenico Di Leo, PhD student, Universit? degli Studi di Napoli Federico II
Ph:     +39 081 676770
Fax:    +39 081 676574
Web: http://wpage.unina.it/domenico.dileo