Hello, >> Can you share with us the code of your "hello" probe ? I used the example code from http://lttng.org/docs/#doc-instrumenting-linux-kernel-itself .
>> Which version or git commit of lttng-modules are you >> using ? I used the current master of the github mirrors, specifically: lttng-tools: 94ffb05d6777efc0c40394d3df44a04feed92953 lttng-modules: d0558de29ca516e83b388b8028651f8b69288e4e lttng-ust: 4bc1ccd721114691c6f0dbd65335b3c43c9f895f > I think the two issues should be fixed by this new > git commit in lttng-modules master branch: > > commit 66fd8d5e4a6080f1b2db0f525c26c07e5b723aab > Author: Mathieu Desnoyers <mathieu.desnoy...@efficios.com> > Date: Thu Apr 23 16:11:15 2015 -0400 > > Fix: double-unlock of session mutex > > Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com> > > Can you give it a try ? Yes, the mutex error goes away. However, loading multiple probes with either --kmod-probes or --extra-kmod-probes still does not work: $ sudo lttng-sessiond -vvv --extra-kmod-probes=sched,napi [...] DEBUG1 - 11:42:18.492870 [5358/5358]: Modprobe successfully lttng-probe-napi (in modprobe_lttng() at modprobe.c:285) sh: 1: Syntax error: "(" unexpected DEBUG1 - 11:42:18.495037 [5358/5358]: Unable to load optional module (null); continuing (in modprobe_lttng() at modprobe.c:281) [...] Also, lttng-probe-regmap does not compile, but that might have to do with my kernel version of 4.0.0-rc4 (commit b314acaccd7e0d55314d96be4a33b5f50d0b3344 from https://github.com/torvalds/linux): lttng-modules$ make KERNELDIR=/usr/src/linux-4.0.0-rc4-atlas+ make -C /usr/src/linux-4.0.0-rc4-atlas+ M=/home/hannesweisbach/atlas/lttng-modules modules make[1]: Entering directory '/usr/src/linux-4.0.0-rc4-atlas+' CC [M] /home/hannesweisbach/atlas/lttng-modules/probes/lttng-probe-regmap.o In file included from /home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/define_trace.h:100:0, from /home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/regmap.h:278, from /home/hannesweisbach/atlas/lttng-modules/probes/lttng-probe-regmap.c:41: /home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/lttng-events.h:134:6: error: conflicting types for ‘trace_regmap_reg_write’ void trace_##_name(_proto); ^ /home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/lttng-events.h:99:2: note: in expansion of macro ‘LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP’ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(template, name, name, PARAMS(proto), PARAMS(args)) ^ /home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/../instrumentation/events/lttng-module/regmap.h:34:1: note: in expansion of macro ‘LTTNG_TRACEPOINT_EVENT_INSTANCE’ LTTNG_TRACEPOINT_EVENT_INSTANCE(regmap_reg, regmap_reg_write, ^ In file included from include/trace/events/regmap.h:8:0, from /home/hannesweisbach/atlas/lttng-modules/probes/lttng-probe-regmap.c:32: include/linux/tracepoint.h:169:21: note: previous definition of ‘trace_regmap_reg_write’ was here static inline void trace_##name(proto) \ ^ include/linux/tracepoint.h:325:3: note: in expansion of macro ‘__DECLARE_TRACE’ __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1, \ ^ include/linux/tracepoint.h:448:2: note: in expansion of macro ‘DECLARE_TRACE’ DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) ^ include/trace/events/regmap.h:40:1: note: in expansion of macro ‘DEFINE_EVENT’ DEFINE_EVENT(regmap_reg, regmap_reg_write, ^ [ and so on, and so on … ] Since I don't need the regmap probe I simply disabled it in probes/Makefile. Unfortunately, I don't have time to debug it myself. If you want me to try another version, let me know. Best regards, Hannes
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