[PATCH 5/8] fix issue: gdb hangs in the command following a commad returning with TARGET_WAITKIND_NO_HISTORY

[Zied Guermazi <zied.guermazi@trande.de>]

This patch fixes an issue observed with btrace when replaying the execution.
The issue was observed on ARMv7 processors.
To reproduce the issue needs to replay in forward direction 
until he reaches the end of history, then replay backwards 
(e.g a reverse-next) and then replay forwards. gdb hangs and the user
can not issue new commands.

gdb/ChangeLog

	* infrun.c (set_step_over_info): add debug print.
	(handle_inferior_event): clear step over info 
	in case TARGET_WAITKIND_NO_HISTORY

---
 gdb/ChangeLog | 6 ++++++
 gdb/infrun.c  | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a84671bf344..15dee4eb29b 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2021-02-25  Zied Guermazi  <zied.guermazi@trande.de>
+
+	* infrun.c (set_step_over_info): add debug print.
+	* infrun.c (handle_inferior_event): clear step over info.
+	in case TARGET_WAITKIND_NO_HISTORY
+
 2021-02-25  Zied Guermazi  <zied.guermazi@trande.de>
 
 	* nat/linux-btrace.h (btrace_tinfo_etm): New.
diff --git a/gdb/infrun.c b/gdb/infrun.c
index a271220b261..a483307d7a3 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -1308,6 +1308,7 @@ set_step_over_info (const address_space *aspace, CORE_ADDR address,
 		    int nonsteppable_watchpoint_p,
 		    int thread)
 {
+  infrun_debug_printf ("infrun: set_step_over_info\n");
   step_over_info.aspace = aspace;
   step_over_info.address = address;
   step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p;
@@ -5536,7 +5537,7 @@ handle_inferior_event (struct execution_control_state *ecs)
       delete_just_stopped_threads_single_step_breakpoints ();
       ecs->event_thread->suspend.stop_pc
 	= regcache_read_pc (get_thread_regcache (inferior_thread ()));
-
+      clear_step_over_info ();
       if (handle_stop_requested (ecs))
 	return;
 
-- 
2.25.1