[LTP] [PATCH COMMITTED] mtest06/mmap1: add note about known panics/stalls on s390x

[Jan Stancek]

Signed-off-by: Jan Stancek <jstancek@redhat.com>
---
 testcases/kernel/mem/mtest06/mmap1.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/testcases/kernel/mem/mtest06/mmap1.c b/testcases/kernel/mem/mtest06/mmap1.c
index 6e8269be02be..b7b742653114 100644
--- a/testcases/kernel/mem/mtest06/mmap1.c
+++ b/testcases/kernel/mem/mtest06/mmap1.c
@@ -11,6 +11,9 @@
  * hit SIGSEGV in between mmap/munmap it is a failure. If a read
  * between mmap/munmap worked, then its value must match expected
  * value.
+ *
+ * Can trigger panics/stalls since at least 4.14 on some arches. See:
+ *   fc8efd2ddfed ("mm/memory.c: do_fault: avoid usage of stale vm_area_struct")
  */
 #include <errno.h>
 #include <float.h>
-- 
1.8.3.1