1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 1114dc42c27f..257931e2fbbe 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4623,6 +4623,10 @@ asmlinkage __visible void lockdep_sys_exit(void)
         /*
          * The lock history for each syscall should be independent. So wipe the
          * slate clean on return to userspace.
+         *
+         * crossrelease_hist_end() works well here even when getting here
+         * without starting (i.e. just after forking), because it rolls back
+         * the index to point to the last entry, which is already invalid.
          */
         crossrelease_hist_end(XHLOCK_PROC);
         crossrelease_hist_start(XHLOCK_PROC);