diff --git a/src/librustc_mir/interpret/validity.rs b/src/librustc_mir/interpret/validity.rs
index d4cf906619d89..11e4ffe19da62 100644
--- a/src/librustc_mir/interpret/validity.rs
+++ b/src/librustc_mir/interpret/validity.rs
@@ -353,7 +353,7 @@ impl<'rt, 'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>>
                 match self.ecx.memory.check_align(ptr, align) {
                     Ok(_) => {},
                     Err(err) => {
-                        error!("{:?} is not aligned to {:?}", ptr, align);
+                        info!("{:?} is not aligned to {:?}", ptr, align);
                         match err.kind {
                             InterpError::InvalidNullPointerUsage =>
                                 return validation_failure!("NULL reference", self.path),
diff --git a/src/test/run-pass/backtrace-debuginfo.rs b/src/test/run-pass/backtrace-debuginfo.rs
index 37c889e9df4ad..7f038ddecc1fa 100644
--- a/src/test/run-pass/backtrace-debuginfo.rs
+++ b/src/test/run-pass/backtrace-debuginfo.rs
@@ -10,9 +10,11 @@
 // ignore-pretty issue #37195
 // ignore-cloudabi spawning processes is not supported
 // ignore-emscripten spawning processes is not supported
+// normalize-stderr-test ".*\n" -> ""
 
-// note that above `-opt-bisect-limit=0` is used to basically disable
-// optimizations
+// Note that above `-opt-bisect-limit=0` is used to basically disable
+// optimizations. It creates tons of output on stderr, hence we normalize
+// that away entirely.
 
 use std::env;
 
diff --git a/src/test/ui/conditional-compilation/cfg-arg-invalid-1.stderr b/src/test/ui/conditional-compilation/cfg-arg-invalid-1.stderr
new file mode 100644
index 0000000000000..1e7922a9ff155
--- /dev/null
+++ b/src/test/ui/conditional-compilation/cfg-arg-invalid-1.stderr
@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a(b=c)` (expected `key` or `key="value"`)
+
diff --git a/src/test/ui/conditional-compilation/cfg-arg-invalid-2.stderr b/src/test/ui/conditional-compilation/cfg-arg-invalid-2.stderr
new file mode 100644
index 0000000000000..b92e1fd3d97cf
--- /dev/null
+++ b/src/test/ui/conditional-compilation/cfg-arg-invalid-2.stderr
@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a{b}` (expected `key` or `key="value"`)
+
diff --git a/src/test/ui/conditional-compilation/cfg-arg-invalid-3.stderr b/src/test/ui/conditional-compilation/cfg-arg-invalid-3.stderr
new file mode 100644
index 0000000000000..5412f7ffd5c9c
--- /dev/null
+++ b/src/test/ui/conditional-compilation/cfg-arg-invalid-3.stderr
@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a::b` (argument key must be an identifier)
+
diff --git a/src/test/ui/conditional-compilation/cfg-arg-invalid-4.stderr b/src/test/ui/conditional-compilation/cfg-arg-invalid-4.stderr
new file mode 100644
index 0000000000000..6853a69b9eb22
--- /dev/null
+++ b/src/test/ui/conditional-compilation/cfg-arg-invalid-4.stderr
@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a(b)` (expected `key` or `key="value"`)
+
diff --git a/src/test/ui/conditional-compilation/cfg-arg-invalid-5.stderr b/src/test/ui/conditional-compilation/cfg-arg-invalid-5.stderr
new file mode 100644
index 0000000000000..aafc4e8980cb5
--- /dev/null
+++ b/src/test/ui/conditional-compilation/cfg-arg-invalid-5.stderr
@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a=10` (argument value must be a string)
+
diff --git a/src/test/ui/conditional-compilation/cfg-empty-codemap.stderr b/src/test/ui/conditional-compilation/cfg-empty-codemap.stderr
new file mode 100644
index 0000000000000..128e3cd730680
--- /dev/null
+++ b/src/test/ui/conditional-compilation/cfg-empty-codemap.stderr
@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `""` (expected `key` or `key="value"`)
+
diff --git a/src/test/ui/duplicate/dupe-symbols-7.rs b/src/test/ui/duplicate/dupe-symbols-7.rs
index b28f1a40fe93b..b838aaa102ebb 100644
--- a/src/test/ui/duplicate/dupe-symbols-7.rs
+++ b/src/test/ui/duplicate/dupe-symbols-7.rs
@@ -1,5 +1,9 @@
 //
 // error-pattern: entry symbol `main` defined multiple times
+
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
 #![allow(warnings)]
 
 #[no_mangle]
diff --git a/src/test/ui/duplicate/dupe-symbols-7.stderr b/src/test/ui/duplicate/dupe-symbols-7.stderr
index a1dbbb0c685fb..7d033ec3d85fa 100644
--- a/src/test/ui/duplicate/dupe-symbols-7.stderr
+++ b/src/test/ui/duplicate/dupe-symbols-7.stderr
@@ -1,5 +1,5 @@
 error: entry symbol `main` defined multiple times
-  --> $DIR/dupe-symbols-7.rs:6:1
+  --> $DIR/dupe-symbols-7.rs:10:1
    |
 LL | fn main(){}
    | ^^^^^^^^^^^
diff --git a/src/test/ui/huge-array-simple.rs b/src/test/ui/huge-array-simple.rs
index 8b244a47232fa..0ff27168a7d86 100644
--- a/src/test/ui/huge-array-simple.rs
+++ b/src/test/ui/huge-array-simple.rs
@@ -1,6 +1,10 @@
 // error-pattern: too big for the current architecture
 
 // normalize-stderr-test "; \d+]" -> "; N]"
+
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
 #![allow(exceeding_bitshifts)]
 
 #[cfg(target_pointer_width = "64")]
diff --git a/src/test/ui/huge-array.rs b/src/test/ui/huge-array.rs
index 0608b23dac6b1..f58dcd5806761 100644
--- a/src/test/ui/huge-array.rs
+++ b/src/test/ui/huge-array.rs
@@ -1,5 +1,9 @@
 // error-pattern:; 1518600000
 
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
+
 fn generic<T: Copy>(t: T) {
     let s: [T; 1518600000] = [t; 1518600000];
 }
diff --git a/src/test/ui/huge-struct.rs b/src/test/ui/huge-struct.rs
index 74e43cc6472be..dc7d75a6f028e 100644
--- a/src/test/ui/huge-struct.rs
+++ b/src/test/ui/huge-struct.rs
@@ -2,6 +2,10 @@
 // normalize-stderr-test "S1M" -> "SXX"
 // error-pattern: too big for the current
 
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
+
 struct S32<T> {
     v0: T,
     v1: T,
diff --git a/src/test/ui/issues/issue-15919.rs b/src/test/ui/issues/issue-15919.rs
index 19ecf2f657e0a..a7ac4802a12d5 100644
--- a/src/test/ui/issues/issue-15919.rs
+++ b/src/test/ui/issues/issue-15919.rs
@@ -1,6 +1,10 @@
 // error-pattern: too big for the current architecture
 // normalize-stderr-test "\[usize; \d+\]" -> "[usize; N]"
 
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
+
 #[cfg(target_pointer_width = "32")]
 fn main() {
     let x = [0usize; 0xffff_ffff];
diff --git a/src/test/ui/issues/issue-17913.rs b/src/test/ui/issues/issue-17913.rs
index b0c4ef54b165d..48d8f407aa1e4 100644
--- a/src/test/ui/issues/issue-17913.rs
+++ b/src/test/ui/issues/issue-17913.rs
@@ -1,6 +1,10 @@
 // normalize-stderr-test "\[&usize; \d+\]" -> "[&usize; N]"
 // error-pattern: too big for the current architecture
 
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
+
 #![feature(box_syntax)]
 
 #[cfg(target_pointer_width = "64")]
diff --git a/src/test/ui/issues/issue-56762.rs b/src/test/ui/issues/issue-56762.rs
index 97b66b2c7c923..8bb81b907c9a4 100644
--- a/src/test/ui/issues/issue-56762.rs
+++ b/src/test/ui/issues/issue-56762.rs
@@ -1,4 +1,8 @@
 // only-x86_64
+
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
 const HUGE_SIZE: usize = !0usize / 8;
 
 
diff --git a/src/test/ui/linkage2.rs b/src/test/ui/linkage2.rs
index 6d1410a90bd21..fa4221fb3392e 100644
--- a/src/test/ui/linkage2.rs
+++ b/src/test/ui/linkage2.rs
@@ -1,3 +1,7 @@
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
+
 #![feature(linkage)]
 
 extern {
diff --git a/src/test/ui/linkage2.stderr b/src/test/ui/linkage2.stderr
index 64213f1270adb..c72978388ebfe 100644
--- a/src/test/ui/linkage2.stderr
+++ b/src/test/ui/linkage2.stderr
@@ -1,5 +1,5 @@
 error: must have type `*const T` or `*mut T`
-  --> $DIR/linkage2.rs:4:32
+  --> $DIR/linkage2.rs:8:32
    |
 LL |     #[linkage = "extern_weak"] static foo: i32;
    |                                ^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/linkage3.rs b/src/test/ui/linkage3.rs
index f094a0d53e941..1462079acf7e7 100644
--- a/src/test/ui/linkage3.rs
+++ b/src/test/ui/linkage3.rs
@@ -1,3 +1,7 @@
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
+
 #![feature(linkage)]
 
 extern {
diff --git a/src/test/ui/linkage3.stderr b/src/test/ui/linkage3.stderr
index a03593ff2c68e..b74fdc91429e2 100644
--- a/src/test/ui/linkage3.stderr
+++ b/src/test/ui/linkage3.stderr
@@ -1,5 +1,5 @@
 error: invalid linkage specified
-  --> $DIR/linkage3.rs:4:24
+  --> $DIR/linkage3.rs:8:24
    |
 LL |     #[linkage = "foo"] static foo: *const i32;
    |                        ^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/test/ui/pattern/const-pat-ice.rs b/src/test/ui/pattern/const-pat-ice.rs
index 865c54be1ad7b..b866c7fa6cc9e 100644
--- a/src/test/ui/pattern/const-pat-ice.rs
+++ b/src/test/ui/pattern/const-pat-ice.rs
@@ -1,5 +1,7 @@
 // failure-status: 101
 // rustc-env:RUST_BACKTRACE=0
+// normalize-stderr-test "note: rustc 1.* running on .*" -> "note: rustc VERSION running on TARGET"
+// normalize-stderr-test "note: compiler flags: .*" -> "note: compiler flags: FLAGS"
 
 // This is a repro test for an ICE in our pattern handling of constants.
 
diff --git a/src/test/ui/pattern/const-pat-ice.stderr b/src/test/ui/pattern/const-pat-ice.stderr
new file mode 100644
index 0000000000000..03580dfecfb59
--- /dev/null
+++ b/src/test/ui/pattern/const-pat-ice.stderr
@@ -0,0 +1,13 @@
+thread 'rustc' panicked at 'assertion failed: rows.iter().all(|r| r.len() == v.len())', src/librustc_mir/hair/pattern/_match.rs:1069:5
+note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
+
+error: internal compiler error: unexpected panic
+
+note: the compiler unexpectedly panicked. this is a bug.
+
+note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
+
+note: rustc VERSION running on TARGET
+
+note: compiler flags: FLAGS
+
diff --git a/src/tools/compiletest/src/json.rs b/src/tools/compiletest/src/json.rs
index 15d449260efa0..ba919f4c4118a 100644
--- a/src/tools/compiletest/src/json.rs
+++ b/src/tools/compiletest/src/json.rs
@@ -78,7 +78,8 @@ pub fn extract_rendered(output: &str, proc_res: &ProcRes) -> String {
                     }
                 }
             } else {
-                None
+                // preserve non-JSON lines, such as ICEs
+                Some(format!("{}\n", line))
             }
         })
         .collect()