[tor-bugs] #29731 [Applications/Tor Browser]: tor compilation hangs frequently when building Windows testbuilds

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#29731: tor compilation hangs frequently when building Windows testbuilds
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-rbm
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 I have seen frequent hangs when building `tor` for Windows lately, the
 output `ps` gives me always indicates that's due to Rust involvement:
 {{{
 boklm    27911  0.0  0.0  21032  2884 ?        S    11:10   0:00 /bin/bash
 -c ( cd "/var/tmp/build/tor-911f95ed9203/src/rust" ; \
 .CARGO_TARGET_DIR="/var/tmp/build/tor-911f95ed9203/src/rust/target" \
 .cargo build --release  \ .--frozen \ .--manifest-path "/var/tmp/build
 /tor-911f95ed9203/src/rust/tor_rust/Cargo.toml" )
 boklm    27912  0.0  0.0  21040  2144 ?        S    11:10   0:00 /bin/bash
 -c ( cd "/var/tmp/build/tor-911f95ed9203/src/rust" ; \
 .CARGO_TARGET_DIR="/var/tmp/build/tor-911f95ed9203/src/rust/target" \
 .cargo build --release  \ .--frozen \ .--manifest-path "/var/tmp/build
 /tor-911f95ed9203/src/rust/tor_rust/Cargo.toml" )
 boklm    27913  0.0  0.1  59928 12672 ?        Sl   11:10   0:00 cargo
 build --release --frozen --manifest-path /var/tmp/build/tor-
 911f95ed9203/src/rust/tor_rust/Cargo.toml
 boklm    27993  0.0  1.5 291156 124976 ?       Sl   11:10   0:00 rustc
 --crate-name external external/lib.rs --crate-type lib --emit=dep-
 info,link -C opt-level=3 -C panic=abort -C debuginfo=2 -C
 metadata=0f05d544ad739841 -C extra-filename=-0f05d544ad739841 --out-dir
 /var/tmp/build/tor-911f95ed9203/src/rust/target/x86_64-pc-windows-
 gnu/release/deps --target x86_64-pc-windows-gnu -L
 dependency=/var/tmp/build/tor-911f95ed9203/src/rust/target/x86_64-pc-
 windows-gnu/release/deps -L dependency=/var/tmp/build/tor-
 911f95ed9203/src/rust/target/release/deps --extern libc=/var/tmp/build
 /tor-911f95ed9203/src/rust/target/x86_64-pc-windows-gnu/release/deps
 /liblibc-705cca6c457715c2.rlib --extern smartlist=/var/tmp/build/tor-
 911f95ed9203/src/rust/target/x86_64-pc-windows-gnu/release/deps
 /libsmartlist-42b40589a0bfb5d0.rlib --extern tor_allocate=/var/tmp/build
 /tor-911f95ed9203/src/rust/target/x86_64-pc-windows-gnu/release/deps
 /libtor_allocate-3bee9e10e00146b6.rlib
 }}}
 I might have seen this once with macOS builds but I think never with Linux
 ones.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29731>
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