linux: use panic=-1 to reboot immediately on panic

This changes the default Linux kernel command line from panic=1 (reboot
one second after panic) to panic=-1 (reboot immediately on panic).  The
kernel should not normally panic; this is just to improve quality of
life for developer workflows, such as running bash as init and exiting
the shell to shut down the VM.

BUG=None
TEST=crosvm run -r vm_rootfs.img -p init=/bin/bash vm_kernel; exit shell

Change-Id: I7c9084ccf1786cd4455fd748512078e02fdb17fa
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1500872
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: David Tolnay <dtolnay@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/x86_64/src/lib.rs b/x86_64/src/lib.rs
index 51c670c..fb4825c 100644
--- a/x86_64/src/lib.rs
+++ b/x86_64/src/lib.rs
@@ -510,7 +510,7 @@ impl X8664arch {
     fn get_base_linux_cmdline() -> kernel_cmdline::Cmdline {
         let mut cmdline = kernel_cmdline::Cmdline::new(CMDLINE_MAX_SIZE as usize);
         cmdline
-            .insert_str("console=ttyS0 noacpi reboot=k panic=1")
+            .insert_str("console=ttyS0 noacpi reboot=k panic=-1")
             .unwrap();
         cmdline
     }