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-rw-r--r--coroutine-ucontext.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/coroutine-ucontext.c b/coroutine-ucontext.c
index 41c2379a2a..42dc3e2cf6 100644
--- a/coroutine-ucontext.c
+++ b/coroutine-ucontext.c
@@ -133,7 +133,7 @@ static Coroutine *coroutine_new(void)
CoroutineUContext *co;
ucontext_t old_uc, uc;
jmp_buf old_env;
- union cc_arg arg;
+ union cc_arg arg = {0};
/* The ucontext functions preserve signal masks which incurs a system call
* overhead. setjmp()/longjmp() does not preserve signal masks but only