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incremental compilation keeps read lock that can deadlock other processes #30127

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opened 2025年12月06日 22:42:33 +01:00 by Techatrix · 0 comments

Zig Version

0.16.0-dev.1569+db15df5da

Steps to Reproduce and Observed Behavior

  1. Initialize a new project with zig init
  2. Run zig build --watch -fincremental and keep it open
  3. While having the previous command running, also run zig build --zig-lib-dir /path/to/different/std. The standard library path used here has to be a different one compared to what is used in the previous step.

The zig build --zig-lib-dir process will never terminate while the progress output is stuck with the following:

[4] Compile Build Script
├─ [1/16113] Linking
└─ compiler_rt

Running lslocks | grep zig outputs something similar to this:

zig 42556 FLOCK 75,4K WRITE* 0 0 0 /home/techatrix/.cache/zig/h/6dbf92093ebbe427196353a8185a66dd.txt
zig 41811 FLOCK 75,4K READ 0 0 0 /home/techatrix/.cache/zig/h/6dbf92093ebbe427196353a8185a66dd.txt
zig 42556 FLOCK 75,9K WRITE 0 0 0 /home/techatrix/zig-testspace/.zig-cache/h/3ce4e4ad0c5734fff7ccf7bed19c7576.txt

41811 -> zig build --watch -fincremental
42556 -> zig build --zig-lib-dir

When manually closing the zig build --watch -fincremental process, the other process will finish.

Expected Behavior

The zig build --watch -fincremental process should eventually release all of its lock while waiting for filesystem changes so that other processes can make progress.

Possible related issue: https://github.com/ziglang/zig/issues/22453

### Zig Version 0.16.0-dev.1569+db15df5da ### Steps to Reproduce and Observed Behavior 1. Initialize a new project with `zig init` 2. Run `zig build --watch -fincremental` and keep it open 3. While having the previous command running, also run `zig build --zig-lib-dir /path/to/different/std`. The standard library path used here has to be a different one compared to what is used in the previous step. The `zig build --zig-lib-dir` process will never terminate while the progress output is stuck with the following: ``` [4] Compile Build Script ├─ [1/16113] Linking └─ compiler_rt ``` Running `lslocks | grep zig` outputs something similar to this: ``` zig 42556 FLOCK 75,4K WRITE* 0 0 0 /home/techatrix/.cache/zig/h/6dbf92093ebbe427196353a8185a66dd.txt zig 41811 FLOCK 75,4K READ 0 0 0 /home/techatrix/.cache/zig/h/6dbf92093ebbe427196353a8185a66dd.txt zig 42556 FLOCK 75,9K WRITE 0 0 0 /home/techatrix/zig-testspace/.zig-cache/h/3ce4e4ad0c5734fff7ccf7bed19c7576.txt ``` 41811 -> `zig build --watch -fincremental` 42556 -> `zig build --zig-lib-dir` When manually closing the `zig build --watch -fincremental` process, the other process will finish. ### Expected Behavior The `zig build --watch -fincremental` process should eventually release all of its lock while waiting for filesystem changes so that other processes can make progress. Possible related issue: https://github.com/ziglang/zig/issues/22453
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