Hi Hannes, On Mon, 5 Nov 2012 23:49:16 +0100, Hannes Frederic Sowa wrote: > While casting an array of (unsigned) chars to a string, perf does not > check the containing type but only the opaque type and is bailing out: > > $ perf probe -v -a 'neigh_destroy:22 dev->name:string' > probe-definition(0): neigh_destroy:22 dev->name:string > symbol:neigh_destroy file:(null) line:22 offset:0 return:0 lazy:(null) > parsing arg: dev->name:string into type:string dev, name(1) > 1 arguments > Use vmlinux: /home/hannes/linux/vmlinux > Using /home/hannes/linux/vmlinux for symbols > Probe point found: neigh_destroy+115 > Searching 'dev' variable in context. > Converting variable dev into trace event. > converting name in dev > name type is (null). > Failed to cast into string: name is not (unsigned) char *. > Failed to find 'dev' in this function. > An error occurred in debuginfo analysis (-22). > Error: Failed to add events. (-22) > > After the code flow ensures that type could only be a pointer or > array type, call die_get_real_type unconditionally again to fetch the > containing type and have further validation been done on that Die.
Hyeoncheol posted a same fix before, but not merged yet, Arnaldo? https://lkml.org/lkml/2012/9/20/3 Thanks, Namhyung -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
