Avoid recursion in panic! macro.

Based on a patch by Alejandro Martinez Ruiz.

Signed-off-by: Piotr Sikora <[email protected]>

Author: PiotrSikora

src/hostcalls.rs

@@ -21,6 +21,12 @@ extern "C" {
     fn proxy_log(level: LogLevel, message_data: *const u8, message_size: usize) -> Status;
 }
 
+pub(crate) fn log_noresult(level: LogLevel, message: &str) {
+    unsafe {
+        let _ = proxy_log(level, message.as_ptr(), message.len());
+    }
+}
+
 pub fn log(level: LogLevel, message: &str) -> Result<(), Status> {
     unsafe {
         match proxy_log(level, message.as_ptr(), message.len()) {

src/logger.rs

@@ -26,7 +26,7 @@ pub(crate) fn set_log_level(level: LogLevel) {
     if !INITIALIZED.load(Ordering::Relaxed) {
         log::set_logger(&LOGGER).unwrap();
         panic::set_hook(Box::new(|panic_info| {
-            hostcalls::log(LogLevel::Critical, &panic_info.to_string()).unwrap();
+            hostcalls::log_noresult(LogLevel::Critical, &panic_info.to_string());
         }));
         INITIALIZED.store(true, Ordering::Relaxed);
     }