main: add panic hook that redirects to syslog

The default panic hook prints panic information and a backtrace to
stderr, where it gets dropped into /dev/null in the typical crostini
context.

This change adds a panic hook that will call the default panic hook
with stderr redirected to a pipe, which will then get forwarded to
syslog.

The new hook also forces an abort at the end to ensure the crash
reporter sees the panicked crosvm process, which will generate a
minidump for later debugging.

TEST=manually add panic!() observe /var/log/messages
BUG=None

Change-Id: I4e76afe811943e55cec91761447e03b949a674a4
Reviewed-on: https://chromium-review.googlesource.com/1440881
Commit-Ready: Zach Reizner <zachr@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 8a4fce0..16dcf10 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -39,6 +39,7 @@ extern crate vm_control;
 
 pub mod argument;
 pub mod linux;
+pub mod panic_hook;
 #[cfg(feature = "plugin")]
 pub mod plugin;
 
@@ -925,6 +926,8 @@ fn crosvm_main() -> std::result::Result<(), ()> {
         return Err(());
     }
 
+    panic_hook::set_panic_hook();
+
     let mut args = std::env::args();
     if args.next().is_none() {
         error!("expected executable name");