Probabilistic compile failure on Windows Server 2016 for target i686-pc-windows-msvc

[Radar3]

# version:
openssl-src-111.15.0+1.1.1k

run:
cargo build --release --target i686-pc-windows-msvc

may fail report:
{ code: 32, kind: Other, message: "The process cannot access the file because it is being used by another process." }
at
openssl-src-111.15.0+1.1.1k\src\lib.rs:456:40, which is:
fs::remove_dir_all(&inner_dir).unwrap();

detail:
created directoryC:/pipeline-255714-1/target/i686-pc-windows-msvc/release/build/openssl-sys-07fd305febe929f0/out/openssl-build/install/lib'
Copying: libcrypto.lib to C:/pipeline-255714-1/target/i686-pc-windows-msvc/release/build/openssl-sys-07fd305febe929f0/out/openssl-build/install/lib/libcrypto.lib
Copying: libssl.lib to C:/pipeline-255714-1/target/i686-pc-windows-msvc/release/build/openssl-sys-07fd305febe929f0/out/openssl-build/install/lib/libssl.lib
Copying: ossl_static.pdb to C:/pipeline-255714-1/target/i686-pc-windows-msvc/release/build/openssl-sys-07fd305febe929f0/out/openssl-build/install/lib/ossl_static.pdb

--- stderr

Microsoft (R) Program Maintenance Utility Version 14.29.30133.0
Copyright (C) Microsoft Corporation. All rights reserved.

Microsoft (R) Program Maintenance Utility Version 14.29.30133.0
Copyright (C) Microsoft Corporation. All rights reserved.

Microsoft (R) Program Maintenance Utility Version 14.29.30133.0
Copyright (C) Microsoft Corporation. All rights reserved.

Microsoft (R) Program Maintenance Utility Version 14.29.30133.0
Copyright (C) Microsoft Corporation. All rights reserved.

Microsoft (R) Program Maintenance Utility Version 14.29.30133.0
Copyright (C) Microsoft Corporation. All rights reserved.

Microsoft (R) Program Maintenance Utility Version 14.29.30133.0
Copyright (C) Microsoft Corporation. All rights reserved.

thread 'main' panicked at 'called Result::unwrap() on an Err value: Os { code: 32, kind: Other, message: "The process cannot access the file because it is being used by another process." }', C:\Windows\system32\config\systemprofile.cargo\registry\src\github.aaakk.us.kg-1ecc6299db9ec823\openssl-src-111.15.0+1.1.1k\src\lib.rs:456:40
[2021-09-02 19:22:06] note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
[2021-09-02 19:22:06]The command "cargo build --release --target i686-pc-windows-msvc" exited with 101. `

Then I add a line before it to print var inner_dir :
panic!("inner_dir {:?}", inner_dir);
thread 'main' panicked at 'inner_dir "C:\\-pipeline-255714-1\\target\\i686-pc-windows-msvc\\release\\build\\openssl-sys-07fd305febe929f0\\out\\openssl-build\\build\\src"', C:\Users\Administrator\.cargo\registry\src\github.aaakk.us.kg-1ecc6299db9ec823\openssl-src-111.15.0+1.1.1k\src\lib.rs:456:9 note: run withRUST_BACKTRACE=1 environment variable to display a backtrace

That means program failed during removing build\src dir.

Then I add a line to sleep 1s before rm dir, it seems resolved. # #
std:: thread ::sleep(std::time::Duration::from_millis(1000));

[alexcrichton]

Thanks for the report. While I don't think adding a sleep is the right fix this is a known issue with MSVC's compilers where they'll run things in the background to generate things like debuginfo I believe. I think it should be fine to update the code here to either ignore the error or do something to try to resolve it.

[Radar3]

Thanks for the report. While I don't think adding a sleep is the right fix this is a known issue with MSVC's compilers where they'll run things in the background to generate things like debuginfo I believe. I think it should be fine to update the code here to either ignore the error or do something to try to resolve it.

Thank You.
I agree, so I just open this issue, and give my local fix, instead of commit it as a PR.