Revert 78373 ("dont leak return value after panic in drop") #81257

pnkfelix · 2021-01-22T03:48:03Z

Short term resolution for issue #80949.

Reopen #47949 after this lands.

(We plan to fine-tune PR #78373 to not run into this problem.)

rust-highfive · 2021-01-22T03:48:07Z

r? @matthewjasper

(rust-highfive has picked a reviewer for you, use r? to override)

pnkfelix · 2021-01-22T03:55:12Z

(shoot, was working on an out-of-date repo clone when I did revert. Rebasing now.)

rust-log-analyzer · 2021-01-22T04:26:15Z

The job x86_64-gnu-llvm-9 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)


---- [mir-opt] mir-opt/issue-41888.rs stdout ----
37     }
38 
39     bb2: {
- <<<<<<< HEAD
- ||||||| parent of 8faab6b3c00... Revert "Use `record_operands_moved` more aggresively"
-         _0 = const ();                   // scope 1 at $DIR/issue-41888.rs:14:6: 14:6
-         goto -> bb7;                     // scope 1 at $DIR/issue-41888.rs:8:5: 14:6
- 
-     bb3: {
- =======
- =======
-         _0 = const ();                   // scope 1 at $DIR/issue-41888.rs:14:6: 14:6
-         goto -> bb8;                     // scope 1 at $DIR/issue-41888.rs:8:5: 14:6
- 
-     bb3: {
-     bb3: {
- >>>>>>> 8faab6b3c00... Revert "Use `record_operands_moved` more aggresively"
54         StorageLive(_3);                 // scope 1 at $DIR/issue-41888.rs:9:13: 9:20
55         StorageLive(_4);                 // scope 1 at $DIR/issue-41888.rs:9:18: 9:19
56         _4 = K;                          // scope 1 at $DIR/issue-41888.rs:9:18: 9:19
61 
62     bb3: {
62     bb3: {
63         _0 = const ();                   // scope 1 at $DIR/issue-41888.rs:14:6: 14:6
-         goto -> bb7;                     // scope 1 at $DIR/issue-41888.rs:8:5: 14:6
+         goto -> bb8;                     // scope 1 at $DIR/issue-41888.rs:8:5: 14:6
66 
67     bb4: {


88         goto -> bb8;                     // scope 1 at $DIR/issue-41888.rs:10:9: 13:10
90 
90 
- <<<<<<< HEAD
-     bb7: {
-         StorageDead(_2);                 // scope 1 at $DIR/issue-41888.rs:14:5: 14:6
-         goto -> bb18;                    // scope 0 at $DIR/issue-41888.rs:15:1: 15:2
- ||||||| parent of 8faab6b3c00... Revert "Use `record_operands_moved` more aggresively"
-     bb7: {
-         goto -> bb18;                    // scope 0 at $DIR/issue-41888.rs:15:1: 15:2
- =======
99     bb8: {
+         StorageDead(_2);                 // scope 1 at $DIR/issue-41888.rs:14:5: 14:6
100         goto -> bb20;                    // scope 0 at $DIR/issue-41888.rs:15:1: 15:2
- >>>>>>> 8faab6b3c00... Revert "Use `record_operands_moved` more aggresively"
103 
104     bb9: {


thread '[mir-opt] mir-opt/issue-41888.rs' panicked at 'Actual MIR output differs from expected MIR output /checkout/src/test/mir-opt/issue_41888.main.ElaborateDrops.after.mir', src/tools/compiletest/src/runtest.rs:3452:25


failures:
    [mir-opt] mir-opt/issue-41888.rs
    [mir-opt] mir-opt/issue-41888.rs

test result: FAILED. 148 passed; 1 failed; 3 ignored; 0 measured; 0 filtered out; finished in 4.08s



command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/mir-opt" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/mir-opt" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--suite" "mir-opt" "--mode" "mir-opt" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-9/bin/FileCheck" "--nodejs" "/usr/bin/node" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python3" "--lldb-python" "/usr/bin/python3" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "9.0.0" "--llvm-components" "aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils aggressiveinstcombine all all-targets amdgpu amdgpuasmparser amdgpucodegen amdgpudesc amdgpudisassembler amdgpuinfo amdgpuutils analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils asmparser asmprinter avr avrasmparser avrcodegen avrdesc avrdisassembler avrinfo binaryformat bitreader bitstreamreader bitwriter bpf bpfasmparser bpfcodegen bpfdesc bpfdisassembler bpfinfo codegen core coroutines coverage debuginfocodeview debuginfodwarf debuginfogsym debuginfomsf debuginfopdb demangle dlltooldriver engine executionengine fuzzmutate globalisel hexagon hexagonasmparser hexagoncodegen hexagondesc hexagondisassembler hexagoninfo instcombine instrumentation interpreter ipo irreader jitlink lanai lanaiasmparser lanaicodegen lanaidesc lanaidisassembler lanaiinfo libdriver lineeditor linker lto mc mca mcdisassembler mcjit mcparser mips mipsasmparser mipscodegen mipsdesc mipsdisassembler mipsinfo mirparser msp430 msp430asmparser msp430codegen msp430desc msp430disassembler msp430info native nativecodegen nvptx nvptxcodegen nvptxdesc nvptxinfo objcarcopts object objectyaml option orcjit passes perfjitevents powerpc powerpcasmparser powerpccodegen powerpcdesc powerpcdisassembler powerpcinfo profiledata remarks riscv riscvasmparser riscvcodegen riscvdesc riscvdisassembler riscvinfo riscvutils runtimedyld scalaropts selectiondag sparc sparcasmparser sparccodegen sparcdesc sparcdisassembler sparcinfo support symbolize systemz systemzasmparser systemzcodegen systemzdesc systemzdisassembler systemzinfo tablegen target textapi transformutils vectorize webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler webassemblyinfo windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info x86utils xcore xcorecodegen xcoredesc xcoredisassembler xcoreinfo xray" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"


failed to run: /checkout/obj/build/bootstrap/debug/bootstrap --stage 2 test --exclude src/tools/tidy
Build completed unsuccessfully in 0:13:06

matthewjasper · 2021-01-24T21:20:11Z

...panview/expected_mir_dump.closure/closure.main-{closure#2}.-------.InstrumentCoverage.0.html

@@ -78,6 +78,7 @@
 100:12-100:20: @0[5]: _5 = (*((*_1).0: &amp;bool))">        let mut countdown = 0;</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="99:29-99:30: @0[1]: _3 = const 0_i32
 99:13-99:26: @0[2]: FakeRead(ForLet, _3)
+<<<<<<< HEAD


Merge has broken here. Coverage tests probably need blessing since there have been other changes to these tests since #78373

oops, sorry about that, thanks!

(how did it pass CI with that in place? Do we not check this output as part of CI?)

(Ah I bet I need to set profiler = true in my config.toml to get the relevant information here.)

yes, this isn't run on the PR builders.

Do you know if I need to do something else besides set profiler = true? I don't see the test failure in my local build (running x.py test src/test/run-make-fulldeps), and thus I expect blessing here won't help until that's resolved.

This is my entire config.toml

changelog-seen = 2 [llvm] assertions = true [build] build = "x86_64-pc-windows-msvc" profiler = true [install] [rust] debug = true [target.x86_64-unknown-linux-gnu] [dist]

The test does take over a minute to run though. I can try on linux if that would help.

Hmm. The profiler coverage tooling and file generation shouldn't be Windows specific, right? So weird that I don't see this.

I'll try to make my own setup more closely match yours, I guess. (Also, @wesleywiser said they'd help; I'm going to get in touch with them soon.)

@pnkfelix I checked out your PR locally and built with ./x.py test src/test/run-make-fulldeps/coverage. The three coverage tests were ignored because I didn't have profiler = true set in my config.toml. After setting that, I reran the command, everything built and I got one failing test: run-make-fulldeps/coverage-spanview. I don't think I have anything special configuration other than profiler = true set.

I went ahead and blessed the test and pushed here in case you just want to cherry-pick that.

pnkfelix · 2021-01-29T17:47:04Z

@matthewjasper am I right in inferring that you are otherwise okay with this PR, assuming the blessing contributed by @wesleywiser worked?

matthewjasper · 2021-01-31T19:12:46Z

Yes, r=me once coverage tests pass.

pnkfelix · 2021-02-01T16:36:45Z

@bors r=matthewjasper

bors · 2021-02-01T16:36:47Z

📌 Commit 37dcdff319c831bbe9568816f5a0e85d1f28ca8a has been approved by matthewjasper

pnkfelix · 2021-02-01T16:37:31Z

(I still haven't managed to figure out why my local machine does not appear to invoke the coverage tests, but at this point I'm going to use Wesley's contribution and cross my fingers.)

pnkfelix · 2021-02-01T19:23:48Z

@bors p=10

(this is a candidate for beta-backport, and so I want to prioritize it over the other PR's I see in the queue that appear to be more cosmetic in nature.)

pnkfelix · 2021-02-01T19:25:31Z

hmm and I guess I also need to up the priority because it already needs a rebase after 3 hours in the queue

bors · 2021-02-05T05:04:48Z

⌛ Testing commit 7c7f10b with merge dafe03c8f7621bca5fd1743e933dee235d2a5cad...

rust-log-analyzer · 2021-02-05T05:08:41Z

The job x86_64-gnu failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

skip untracked path cpu-usage.csv during rustfmt invocations
skip untracked path src/doc/book/ during rustfmt invocations
skip untracked path src/doc/rust-by-example/ during rustfmt invocations
skip untracked path src/llvm-project/ during rustfmt invocations
Diff in /checkout/compiler/rustc_mir_build/src/build/mod.rs at line 76:
             kind: hir::TraitItemKind::Const(ty, Some(body_id)),
             ..
         }) => (*body_id, ty.span, None),
-        Node::AnonConst(hir::AnonConst { body, hir_id, .. }) => (*body, tcx.hir().span(*hir_id), None),
+        Node::AnonConst(hir::AnonConst { body, hir_id, .. }) => {
+            (*body, tcx.hir().span(*hir_id), None)
+        }
Running `"/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustfmt" "--config-path" "/checkout" "--edition" "2018" "--unstable-features" "--skip-children" "--check" "/checkout/compiler/rustc_mir_build/src/build/mod.rs"` failed.
If you're running `tidy`, try again with `--bless`. Or, if you just want to format code, run `./x.py fmt` instead.
 
         _ => span_bug!(tcx.hir().span(id), "can't build MIR for {:?}", def.did),
Diff in /checkout/compiler/rustc_mir_build/src/build/mod.rs at line 184:
                 return_ty,
                 return_ty_span,
                 body,
                 body,
-                span_with_body
+                span_with_body,
             );
             mir.yield_ty = yield_ty;
Diff in /checkout/compiler/rustc_mir_build/src/build/mod.rs at line 582:
Diff in /checkout/compiler/rustc_mir_build/src/build/mod.rs at line 582:
     return_ty: Ty<'tcx>,
     return_ty_span: Span,
     body: &'tcx hir::Body<'tcx>,
-    span_with_body: Span
+    span_with_body: Span,
 ) -> Body<'tcx>
 where
     A: Iterator<Item = ArgInfo<'tcx>>,
Diff in /checkout/compiler/rustc_mir_build/src/build/mod.rs at line 658:
     let owner_id = tcx.hir().body_owner(body_id);
     let def_id = tcx.hir().local_def_id(owner_id);
     let span = tcx.hir().span(owner_id);
-    let mut builder = Builder::new(hir, def_id.to_def_id(), span, 0, Safety::Safe, const_ty, const_ty_span, None);
+    let mut builder =
+        Builder::new(hir, def_id.to_def_id(), span, 0, Safety::Safe, const_ty, const_ty_span, None);
     let mut block = START_BLOCK;
     let mut block = START_BLOCK;
     let ast_expr = &tcx.hir().body(body_id).value;
Diff in /checkout/compiler/rustc_mir_build/src/build/mod.rs at line 698:
         hir::BodyOwnerKind::Const => 0,
         hir::BodyOwnerKind::Static(_) => 0,
     };
-    let mut builder = Builder::new(hir, def_id.to_def_id(), span, num_params, Safety::Safe, ty, span, None);
+    let mut builder =
+        Builder::new(hir, def_id.to_def_id(), span, num_params, Safety::Safe, ty, span, None);
     let source_info = builder.source_info(span);
     // Some MIR passes will expect the number of parameters to match the
     // function declaration.
failed to run: /checkout/obj/build/bootstrap/debug/bootstrap --stage 2 test

bors · 2021-02-05T05:10:39Z

💔 Test failed - checks-actions

wesleywiser · 2021-02-05T12:14:15Z

Pushed a fix for the tidy errors.

@bors r=matthewjasper p=10 rollup=never

bors · 2021-02-05T12:14:16Z

📌 Commit dce5e9e has been approved by matthewjasper

bors · 2021-02-05T14:53:03Z

⌛ Testing commit dce5e9e with merge 5605b5d...

bors · 2021-02-05T17:42:25Z

☀️ Test successful - checks-actions
Approved by: matthewjasper
Pushing 5605b5d to master...

…ution-via-revert-of-pr-78373, r=matthewjasper Revert 78373 ("dont leak return value after panic in drop") Short term resolution for issue rust-lang#80949. Reopen rust-lang#47949 after this lands. (We plan to fine-tune PR rust-lang#78373 to not run into this problem.)

[beta] backports This backports: * CI: only copy python.exe to python3.exe if the latter does not exist rust-lang#81762 * Make hitting the recursion limit in projection non-fatal rust-lang#81055 * Remove incorrect `delay_span_bug` rust-lang#81532 * introduce future-compatibility warning for forbidden lint groups rust-lang#81556 * Update cargo rust-lang#81755 * rustdoc: Fix visibility of trait and impl items rust-lang#81288 * Work around missing -dev packages in solaris docker image. rust-lang#81229 * Update LayoutError/LayoutErr stability attributes rust-lang#81767 * Revert 78373 ("dont leak return value after panic in drop") rust-lang#81257 * Rename `panic_fmt` lint to `non_fmt_panic` rust-lang#81729

rust-highfive assigned matthewjasper Jan 22, 2021

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pnkfelix force-pushed the issue-80949-short-term-resolution-via-revert-of-pr-78373 branch from 3f6eac0 to c9c2fa8 Compare January 22, 2021 04:10

pnkfelix force-pushed the issue-80949-short-term-resolution-via-revert-of-pr-78373 branch from c9c2fa8 to d37cc61 Compare January 22, 2021 04:51

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matthewjasper added beta-nominated Nominated for backporting to the compiler in the beta channel. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 22, 2021

pnkfelix mentioned this pull request Jan 22, 2021

regression 1.50: Borrow checker reports function param as not living long enough #80949

Closed

Mark-Simulacrum mentioned this pull request Jan 24, 2021

Update RELEASES.md for 1.50.0 #80812

Merged

matthewjasper reviewed Jan 24, 2021

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pnkfelix added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 26, 2021

apiraino added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Jan 28, 2021

pnkfelix force-pushed the issue-80949-short-term-resolution-via-revert-of-pr-78373 branch from 55980b8 to 37dcdff Compare February 1, 2021 16:36

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pnkfelix force-pushed the issue-80949-short-term-resolution-via-revert-of-pr-78373 branch from 37dcdff to 4d59bb4 Compare February 1, 2021 19:28

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 5, 2021

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Run x.py fmt to fix tidy issues

dce5e9e

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 5, 2021

ehuss mentioned this pull request Feb 5, 2021

[beta] backports #81774

Merged

bors added the merged-by-bors This PR was explicitly merged by bors. label Feb 5, 2021

bors merged commit 5605b5d into rust-lang:master Feb 5, 2021

rustbot added this to the 1.51.0 milestone Feb 5, 2021

This was referenced Feb 5, 2021

BTree: share panicky test code & test panic during clear, clone #81300

Merged

BTreeMap: clean up implementation of clone #81276

Closed

path trimming: ignore type aliases #78052

Merged

ehuss removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Feb 5, 2021

pnkfelix mentioned this pull request Feb 5, 2021

Panics in destructors can cause the return value to be leaked #47949

Open

ehuss mentioned this pull request Feb 8, 2021

spurious CI error for MSVC #81890

Closed

cuviper mentioned this pull request Feb 15, 2021

Cross-compiling Rust to s390x yields a faulty toolchain #80810

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Revert 78373 ("dont leak return value after panic in drop") #81257

Revert 78373 ("dont leak return value after panic in drop") #81257

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Revert 78373 ("dont leak return value after panic in drop") #81257

Revert 78373 ("dont leak return value after panic in drop") #81257

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