On Tue, 20 Sep 2016 01:32:04 +0200 (CEST) Thomas Gleixner <[email protected]> wrote:
> Masami, > > On Tue, 20 Sep 2016, Masami Hiramatsu wrote: > > Hmm, could you try to find mangled symbol from the library as below? > > > > ./perf probe -x /usr/lib64/libstdc++.so.6 -F \* > > > > And also try to do adding probe with -v option again? > > > > In my case, I could find the mangled symbol, but failed to setup the > > probe... > > ./perf probe -x /usr/lib/x86_64-linux-gnu/libstdc++.so.6 -v > _X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv > probe-definition(0): _X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv > symbol:_X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv file:(null) > line:0 offset:0 return:0 lazy:(null) > 0 arguments > symbol:catch file:(null) line:0 offset:0 return:0 lazy:(null) > symbol:throw file:(null) line:0 offset:0 return:0 lazy:(null) > symbol:rethrow file:(null) line:0 offset:0 return:0 lazy:(null) > Open Debuginfo file: > /usr/lib/debug/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22 > Try to find probe point from debuginfo. > Symbol _X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv address found : > 8c620 > Matched function: is_open > found inline addr: 0x8cad0 > Probe point found: is_open+0 > found inline addr: 0x8cac0 > Probe point found: is_open+0 > found inline addr: 0x8cab0 > Probe point found: is_open+0 > Matched function: is_open > An error occurred in debuginfo analysis (-2). > Trying to use symbols. > Opening /sys/kernel/tracing//uprobe_events write=1 > Writing event: > p:probe_libstdc++/_X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv > /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22:0x8c620 > Failed to write event: Invalid argument > Error: Failed to add events. Reason: Invalid argument (Code: -22) > > [16568.176464] Failed to allocate trace_uprobe.(-22) > [16568.176468] Failed to parse address or file. > > Aside of that mangled symbols with a @plt suffix do not work at all. Oh, OK. I could reproduce it. I'll investigate it. :) Thank you, -- Masami Hiramatsu <[email protected]>
