X-Debbugs-CC: t...@invisible-island.net
在 2024-07-03星期三的 16:28 +0200，Kristian Nielsen写道：
> Package: mawk
> Version: 1.3.4.20240622-1
> Severity: normal
>
> Dear Maintainer,
>
> Running mawk produces wrong output from rand() on i386:
>
> $ echo | mawk 'BEGIN {srand(10);} {print rand()};'
> 0.158578
> $ echo | mawk 'BEGIN {srand(10);} {print rand()};'
> -0.276944
> $ echo | mawk 'BEGIN {srand(10);} {print rand()};'
> -0.387807
> $ echo | mawk 'BEGIN {srand(10);} {print rand()};'
> 0.470306
>
> The result of rand() should never be negative; and it should be
> deterministic after calling srand().
>
> This occurs on i386 (tested in sbuild --arch=i386 as part of debugging a
> reproducible build problem of package openscad).
>
> The expected output is the same value between 0 and 1, for example:
>
> $ echo | mawk 'BEGIN {srand(10);} {print rand()};'
> 0.559536
> $ echo | mawk 'BEGIN {srand(10);} {print rand()};'
> 0.559536
> $ echo | mawk 'BEGIN {srand(10);} {print rand()};'
> 0.559536
>
> The longer story, for completeness: I am the maintainer for openscad, and I
> see openscad sometimes failing to build reproducibly on (only) i386 during
> the past year. The root cause seems to be a test script that calls awk and
> behaves unexpectedly due to getting a negative number out of rand().
>
> The problem does not seem to occur on amd64 or arm64. Openscad doesn't build
> on armhf, so not sure if the problem in mawk is specific to i386 or may be
> specific to 32-bit for example.Ack. Reproducible on Debian Sid (mawk/1.3.4.20240622), not reproducible on Debian 12 Bookworm (mawk/1.3.4.20200120). Likely a regression since 2020. CC the mawk upstream developer to make them aware of this issue. Thomas: if you need help in setting up a proper Debian Sid i386 environment to reproduce the issue and do debugging, feel free to let me know. Thanks, Boyuan Yang
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