tracepoint probes: clear session derived_probe_groups pointer in ctor to avoid SEGV

1 files changed, 2 insertions, 0 deletions

diff --git a/session.h b/session.h
index 8fa491fd..bc99385b 100644
--- a/session.h
+++ b/session.h
@@ -167,6 +167,8 @@ struct systemtap_session
   hrtimer_derived_probe_group* hrtimer_derived_probes;
   perfmon_derived_probe_group* perfmon_derived_probes;
   procfs_derived_probe_group* procfs_derived_probes;
+  // NB: It is very important for all of the above (and below) fields
+  // to be cleared in the systemtap_session ctor (elaborate.cxx).
 
   // unparser data
   translator_output* op;