debug: workaround for strange va_list corruption bug
diff --git a/openbsc/src/debug.c b/openbsc/src/debug.c
index 30e27a8..15271fe 100644
--- a/openbsc/src/debug.c
+++ b/openbsc/src/debug.c
@@ -223,8 +223,15 @@
output = 1;
}
- if (output)
- _output(tar, subsys, file, line, cont, format, ap);
+ if (output) {
+ /* FIXME: copying the va_list is an ugly workaround against a bug
+ * hidden somewhere in _output. If we do not copy here, the first
+ * call to _output() will corrupt the va_list contents, and any
+ * further _output() calls with the same va_list will segfault */
+ va_list bp;
+ va_copy(bp, ap);
+ _output(tar, subsys, file, line, cont, format, bp);
+ }
}
}