-Zprofile broken in nightly? #50203

mssun · 2018-04-24T21:58:56Z

I am using -Zprofile to use gcov. However, the results are corrupted.

Here are my info.

$ cargo -V
cargo 1.26.0-nightly (008c36908 2018-04-13)
$ rustc -V
rustc 1.27.0-nightly (ac3c2288f 2018-04-18)

Reproduce the issue:

$ cargo new hello_world --bin
$ cargo rustc --bins -- -Zprofile -Copt-level=1 -Clink-dead-code -Ccodegen-units=1 -Zno-landing-pads
$ ./target/debug/hello_world
./target/debug/hello_world
Hello, world!
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x66353136)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x37633437)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x66353136)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x63626564)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x00456238)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x38327472)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000000)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0xa3000000)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x246e6f69)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x36245447)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x36626331)
profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x00004530)

It works when using older version:

$ rustup override set nightly-2017-06-28

I don't know if this issue related with kennytm/cov#18

Also: ping #42524

The text was updated successfully, but these errors were encountered:

marco-c · 2018-06-08T17:16:39Z

It would be great if we could bisect this, to know what caused the regression.

mssun · 2018-06-08T17:39:03Z

Thanks. It still breaks on the latest nightly.

$ rustc -V
rustc 1.28.0-nightly (4a9c58c6b 2018-06-05)
$ cargo -V
cargo 1.28.0-nightly (c3b09c968 2018-05-27)

This feature is really important to get a proper code coverage profile.

marco-c · 2018-06-08T17:39:41Z

I'm trying to bisect manually.
For now:
2018-01-01 is broken.
2017-12-15 is working.

marco-c · 2018-06-08T17:50:45Z

2017-12-24 is working. 2017-12-25 is broken.
Here are the commits landed between those two days: https://github.com/rust-lang/rust/compare/master@%7B2017-12-24%7D...master@%7B2017-12-25%7D.

marco-c · 2018-06-08T17:57:32Z

I guess we should have added parsing of gcda as part of this test: https://github.com/rust-lang/rust/blob/master/src/test/run-make-fulldeps/profile/Makefile.

marco-c · 2018-06-12T06:41:49Z

@alexcrichton is the range from #50203 (comment) correct? I guess there's a precise way to tell what commit a given Nightly build correspons to?

kennytm · 2018-06-14T11:27:34Z

C:\> rustc +nightly-2017-12-24 -vV
rustc 1.24.0-nightly (169929308 2017-12-23)
binary: rustc
commit-hash: 16992930835ce3376a4aaed42307726e1fc78e45
commit-date: 2017-12-23
host: x86_64-pc-windows-msvc
release: 1.24.0-nightly
LLVM version: 4.0

C:\> rustc +nightly-2017-12-25 -vV
rustc 1.24.0-nightly (c284f8807 2017-12-24)
binary: rustc
commit-hash: c284f8807eb3a1d728242bb6a767b0306d6f6bd5
commit-date: 2017-12-24
host: x86_64-pc-windows-msvc
release: 1.24.0-nightly
LLVM version: 4.0

The regression happens between 1699293...c284f88

PRs in this range:

incr.comp.: Cache check_match and use ensure() for coherence-related queries. #46881 (incr.comp.: Cache check_match and use ensure() for coherence-related queries.)
Prevent unwinding past FFI boundaries #46833 (Prevent unwinding past FFI boundaries)
Add a feature gate for nested uses of impl Trait #46888 (Add a feature gate for nested uses of impl Trait)
Only mark unions as uninhabited if all of their fields are uninhabited #46859 (Only mark unions as uninhabited if all of their fields are uninhabited)
Const-eval array lengths in rustdoc. #46894 (Const-eval array lengths in rustdoc.)
fix debuginfo scoping of let-statements #46896 (fix debuginfo scoping of let-statements)
Update Cargo and its dependencies #46630 (Update Cargo and its dependencies)
Capture Command environment at spawn #46789 (Capture Command environment at spawn)

Fast PR-by-PR bisection is impossible at this point since the artifacts have been deleted.

marco-c · 2018-06-18T00:05:44Z

Thanks @kennytm. I've tested with 4910ed2 and it is working. So the regression is between 4910ed2 and c284f88.

kennytm · 2018-06-18T07:29:33Z

It is caused by incremental compilation.

~:45$ rustc --crate-name hello_world src/main.rs --crate-type bin --emit=link -C debuginfo=2 -Zprofile -Copt-level=1 -Clink-dead-code -Ccodegen-units=1 -Zno-landing-pads -C metadata=e6641c514587dc22 -C extra-filename=-e6641c514587dc22 --out-dir ~/hello_world/target/debug/deps 

~:46$ ./target/debug/deps/hello_world-e6641c514587dc22
Hello, world!

~:47$ rustc --crate-name hello_world src/main.rs --crate-type bin --emit=link -C debuginfo=2 -Zprofile -Copt-level=1 -Clink-dead-code -Ccodegen-units=1 -Zno-landing-pads -C metadata=e6641c514587dc22 -C extra-filename=-e6641c514587dc22 --out-dir ~/hello_world/target/debug/deps -C incremental=~/hello_world/target/debug/incremental

~:48$ ./target/debug/deps/hello_world-e6641c514587dc22
Hello, world!
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000001)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x24246437)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous run count: corrupt object tag (0x24643775)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x39383038)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous run count: corrupt object tag (0x32626265)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x39383038)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000000)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous run count: corrupt object tag (0x62333333)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x38327472)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x34737973)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous run count: corrupt object tag (0x78696e75)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x246e6f69)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous run count: corrupt object tag (0x36245447)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous GCDA file: corrupt arc tag (0x38306266)
profiling: ~/hello_world/target/debug/deps/hello_world-e6641c514587dc22.gcda: cannot merge previous run count: corrupt object tag (0x00004538)

marco-c · 2018-06-18T08:31:43Z

git bisect start
# bad: [c284f8807eb3a1d728242bb6a767b0306d6f6bd5] Auto merge of #46789 - Diggsey:command-env-capture, r=dtolnay
git bisect bad c284f8807eb3a1d728242bb6a767b0306d6f6bd5
# good: [16992930835ce3376a4aaed42307726e1fc78e45] Auto merge of #46864 - estebank:closure-type-err-sp, r=nikomatsakis
git bisect good 16992930835ce3376a4aaed42307726e1fc78e45
# good: [16992930835ce3376a4aaed42307726e1fc78e45] Auto merge of #46864 - estebank:closure-type-err-sp, r=nikomatsakis
git bisect good 16992930835ce3376a4aaed42307726e1fc78e45
# good: [11a24d9c3940f60e527c571680d64e80e0889abe] Auto merge of #46888 - cramertj:nested-impl-trait-error, r=nikomatsakis
git bisect good 11a24d9c3940f60e527c571680d64e80e0889abe
# good: [304717bd86e42bc9b0c45ea5a6068e7ed9d13f2f] Auto merge of #46894 - detrumi:fix-const-eval-trait, r=eddyb
git bisect good 304717bd86e42bc9b0c45ea5a6068e7ed9d13f2f

Almost done.

marco-c · 2018-06-18T12:59:05Z

325d739 is the culprit.

marco-c · 2018-06-18T13:01:25Z

325d739 updated Cargo from 930f9d949b384fde9b0d7b9cc590515933f194c0 to e08f310188cc0d101550c21b3d88877cfba7e5e1, here's the list of commits that landed between the two: rust-lang/cargo@930f9d9...e08f310.

marco-c · 2018-06-18T13:02:54Z

So I guess it's simply rust-lang/cargo#4817.

kennytm · 2018-06-18T14:22:09Z

Well so we're back to square one 😞. Maybe inc. comp. is simply incompatible with -Zprofile.

marco-c · 2018-06-18T17:20:40Z

We could disable incremental compilation when profile is enabled, like for LTO.

marco-c · 2018-06-19T23:35:03Z

We could disable incremental compilation when profile is enabled, like for LTO.

I've opened #51645 to do this.

…michaelwoerister Raise an error if gcov profiling and incremental compilation are both enabled Fixes #50203.

wllenyj · 2022-02-16T09:06:21Z

The same problem reappeared in 1.60.0-nightly (09cb29c 2022-02-15)

    ubuntu: info: default toolchain set to 'nightly-x86_64-unknown-linux-gnu'
    ubuntu:   nightly-x86_64-unknown-linux-gnu installed - rustc 1.60.0-nightly (09cb29c64 2022-02-15)
    ubuntu: 
    ubuntu: 
    ubuntu: Rust is installed now. Great!

...

failures:

---- x86_64::mpspec::bindgen_test_layout_mpc_cpu stdout ----
---- x86_64::mpspec::bindgen_test_layout_mpc_cpu stderr ----
profiling: /vagrant/target/debug/deps/db_boot-f38d7d4bfa105ed8.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000000)
profiling: /vagrant/target/debug/deps/db_boot-f38d7d4bfa105ed8.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000001)
profiling: /vagrant/target/debug/deps/db_boot-f38d7d4bfa105ed8.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000001)
profiling: /vagrant/target/debug/deps/db_boot-f38d7d4bfa105ed8.gcda: cannot merge previous GCDA file: corrupt arc tag (0x75747375)
profiling: /vagrant/target/debug/deps/db_boot-f38d7d4bfa105ed8.gcda: cannot merge previous GCDA file: corrupt arc tag (0x3638782d)
profiling: /vagrant/target/debug/deps/db_boot-f38d7d4bfa105ed8.gcda: cannot merge previous GCDA file: corrupt arc tag (0x696c2f75)

See https://github.com/wllenyj/dragonball-sandbox/runs/5212083346 for details.

mssun changed the title ~~Does -Zprofile broken in nightly?~~ Is -Zprofile broken in nightly? Apr 24, 2018

mssun changed the title ~~Is -Zprofile broken in nightly?~~ -Zprofile broken in nightly? Apr 24, 2018

pietroalbini added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. labels Apr 26, 2018

garious mentioned this issue May 7, 2018

Test-drive new coverage tooling in Rust nightly solana-labs/solana#177

Closed

kennytm added the A-incr-comp Area: Incremental compilation label Jun 18, 2018

kennytm added a commit to kennytm/cov that referenced this issue Jun 18, 2018

Disable incremental to workaround rust-lang/rust#50203.

05d1c1e

marco-c mentioned this issue Jun 19, 2018

Raise an error if gcov profiling and incremental compilation are both enabled #51645

Merged

bors added a commit that referenced this issue Jul 2, 2018

Auto merge of #51645 - marco-c:error_when_incremental_and_profile, r=…

e75e782

…michaelwoerister Raise an error if gcov profiling and incremental compilation are both enabled Fixes #50203.

bors closed this as completed in #51645 Jul 2, 2018

marco-c mentioned this issue Jul 2, 2018

Make incremental compilation work with -Zprofile #51983

Open

glandium mentioned this issue Mar 27, 2021

-Z profile broken since the upgrade to LLVM 11 #83552

Closed

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-Zprofile broken in nightly? #50203

-Zprofile broken in nightly? #50203

mssun commented Apr 24, 2018

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wllenyj commented Feb 16, 2022

-Zprofile broken in nightly? #50203

-Zprofile broken in nightly? #50203

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