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RE: Stap is translating to functions in __exit sections...and later module load fails
- From: "Stone, Joshua I" <joshua dot i dot stone at intel dot com>
- To: "Keshavamurthy, Anil S" <anil dot s dot keshavamurthy at intel dot com>
- Cc: "Systemtap" <systemtap at sources dot redhat dot com>
- Date: Fri, 13 Oct 2006 14:02:39 -0700
- Subject: RE: Stap is translating to functions in __exit sections...and later module load fails
On Friday, October 13, 2006 1:26 PM, Keshavamurthy, Anil S wrote:
> stap -e 'probe kernel.function("*") { log("."); }'
> results in
> ERROR: dwarf probe
> kernel.function("exit_pfm_fs@arch/ia64/kernel/perfmon.c:1507")
> registration failed, rc=1
>
> Looks like on Ia64, stap is translating to functions which are in
> __exit sections, as in the above failure case exit_pfm_fs() function
> is prefixed with __exit and when the module is loaded the
> kprobe registration fails as the functions in exit sections no longer
> exist.
The translator blacklist tries to avoid such functions by checking the
section name -- anything within a section beginning with '.exit.' (e.g.,
.exit.text) is blacklisted, and thus won't match a function("*").
Does IA64 do something different with the __exit sections?
Josh