Stap is translating to functions in __exit sections...and later module load fails

[Stone, Joshua I]

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