Bug 1671691 - Enable Rust stdlib instrumentation. r=decoder

* Bumps the tsan toolchain to rust-nightly-2020-11-14 that has my patches to make -Zbuild-std work in vendored environments:
  * rust-lang/cargo#8834
  * rust-lang/rust#78790

* Passes -Zbuild-std to cargo when MOZ_TSAN is defined (mk_add_options --enable-thread-sanitizer)

* Removes generic Rust supressions and adds much more specific ones
    * One presumed upstream false positive from tsan not understanding the code
    * One actual upstream bug tsan found (yay!)
    * One new real issue uncovered
    * One issue that probably already existed intermittently but I happened to hit

Differential Revision: https://phabricator.services.mozilla.com/D97165

config/makefiles/rust.mk

@@ -53,8 +53,11 @@ ifeq (1,$(MOZ_PARALLEL_BUILD))
 cargo_build_flags += -j1
 endif
 
-# This should also be paired with -Zbuild-std, but that doesn't work yet.
+# We also need to rebuild the rust stdlib so that it's instrumented. Because
+# build-std is still pretty experimental, we need to explicitly request
+# the panic_abort crate for `panic = "abort"` support.
 ifdef MOZ_TSAN
+cargo_build_flags += -Zbuild-std=std,panic_abort
 RUSTFLAGS += -Zsanitizer=thread
 endif
 

mozglue/build/TsanOptions.cpp

@@ -168,26 +168,18 @@ extern "C" const char* __tsan_default_suppressions() {
          // up due to "volatile" being too weak for this.
          "race:third_party/sqlite3/*\n"
          "deadlock:third_party/sqlite3/*\n"
-
-
-
-
-
-         // Lack of proper instrumentation for the Rust stdlib (fix this!).
+         // Bug 1674770 - permanent
+         // Upstream Bug: https://github.com/Amanieu/parking_lot/issues/257
          //
-         // All of these can potentially be removed if we fix Bug 1671691.
-
-         // Bug 1587513 - permanent
-         "race:std::sync::mutex::Mutex\n"
-         // Bug 1590423 - permanent
-         "race:sync..Arc\n"
-         "race:alloc::sync::Arc\n"
-         // No Bug - permanent
-         "race:third_party/rust/parking_lot_core/*\n"
+         // parking_lot using incorrect atomic orderings in RwLock, upstream
+         // fix already up for review.
+         "race:StrongRuleNode::ensure_child\n"
          // No Bug - permanent
-         "race:/rustc/*.rs\n"
-         "deadlock:/rustc/*.rs\n"
-         "thread:std::sys::unix::thread::Thread::new\n"
+         // Upstream Bug: https://github.com/rayon-rs/rayon/issues/812
+         //
+         // Probably a false-positive from crossbeam's deque not being
+         // understood by tsan.
+         "race:crossbeam_deque::Worker$LT$T$GT$::resize\n"
 
 
 
@@ -311,6 +303,13 @@ extern "C" const char* __tsan_default_suppressions() {
          "race:VRShMem::PullSystemState\n"
          "race:VRShMem::PushSystemState\n"
 
+         // Bug 1674776
+         "race:DocumentTimeline::GetCurrentTimeAsDuration\n"
+
+         // Bug 1674835
+         "race:nsHttpTransaction::ReadSegments\n"
+         "race:nsHttpTransaction::SecurityInfo\n"
+
       // End of suppressions.
       ;  // Please keep this semicolon.
 }

taskcluster/ci/toolchain/rust.yml

@@ -48,7 +48,7 @@ linux64-rust-nightly:
         arguments: [
             # Last nightly with version 1.48.0. See bug #1672094 why
             # we're using this rather than the first with version 1.48.0.
-            '--channel', 'nightly-2020-10-03',
+            '--channel', 'nightly-2020-11-14',
             '--host', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-unknown-linux-gnu',
             '--target', 'i686-unknown-linux-gnu',

toolkit/library/rust/shared/build.rs

@@ -9,7 +9,7 @@ use rustc_version::{version, Version};
 fn main() {
     let ver = version().unwrap();
     let mut bootstrap = false;
-    let max_oom_hook_version = Version::parse("1.50.0-alpha").unwrap();
+    let max_oom_hook_version = Version::parse("1.51.0-alpha").unwrap();
 
     if ver >= Version::parse("1.28.0-alpha").unwrap() && ver < max_oom_hook_version {
         println!("cargo:rustc-cfg=feature=\"oom_with_hook\"");