From 2e8e8ab564891c3d2ffeeb0f8e1a4e850866f74f Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Tue, 17 Mar 2015 23:05:44 -0700
Subject: [PATCH 1/2] Ignore stdio mutex poison state

Nothing inside of the read/write interface itself can panic, so any
poison must have been the result of user code which the lock isn't
protecting.
---
 src/libstd/io/stdio.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/libstd/io/stdio.rs b/src/libstd/io/stdio.rs
index 75d047d5c9c85..615607eed1ba5 100644
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -146,7 +146,7 @@ impl Stdin {
     /// accessing the underlying data.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn lock(&self) -> StdinLock {
-        StdinLock { inner: self.inner.lock().unwrap() }
+        StdinLock { inner: self.inner.lock().unwrap_or_else(|e| e.into_inner()) }
     }
 
     /// Locks this handle and reads a line of input into the specified buffer.
@@ -249,7 +249,7 @@ impl Stdout {
     /// returned guard also implements the `Write` trait for writing data.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn lock(&self) -> StdoutLock {
-        StdoutLock { inner: self.inner.lock().unwrap() }
+        StdoutLock { inner: self.inner.lock().unwrap_or_else(|e| e.into_inner()) }
     }
 }
 
@@ -319,7 +319,7 @@ impl Stderr {
     /// returned guard also implements the `Write` trait for writing data.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn lock(&self) -> StderrLock {
-        StderrLock { inner: self.inner.lock().unwrap() }
+        StderrLock { inner: self.inner.lock().unwrap_or_else(|e| e.into_inner()) }
     }
 }
 

From a51cd6116446d74a336abcb00f5ced3582ec307f Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Wed, 18 Mar 2015 09:03:17 -0700
Subject: [PATCH 2/2] Add a test

---
 src/libstd/io/stdio.rs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/libstd/io/stdio.rs b/src/libstd/io/stdio.rs
index 615607eed1ba5..9b36408aa5116 100644
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -402,3 +402,29 @@ pub fn _print(args: fmt::Arguments) {
         panic!("failed printing to stdout: {}", e);
     }
 }
+
+#[cfg(test)]
+mod test {
+    use thread;
+    use super::*;
+
+    #[test]
+    fn panic_doesnt_poison() {
+        thread::spawn(|| {
+            let _a = stdin();
+            let _a = _a.lock();
+            let _a = stdout();
+            let _a = _a.lock();
+            let _a = stderr();
+            let _a = _a.lock();
+            panic!();
+        }).join().unwrap_err();
+
+        let _a = stdin();
+        let _a = _a.lock();
+        let _a = stdout();
+        let _a = _a.lock();
+        let _a = stderr();
+        let _a = _a.lock();
+    }
+}