Re: Git 2.14.1: t6500: error during test on musl libc

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On Thu, Sep 14, 2017 at 09:43:12PM -0500, A. Wilcox wrote:
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> Hi there,
> 
> While bumping Git's version for our Linux distribution to 2.14.1, I've
> run in to a new test failure in t6500-gc.sh.  This is the output of
> the failing test with debug=t verbose=t:

This is a new test introduced by c45af94db 
(gc: run pre-detach operations under lock, 2017-07-11) which was
included in v2.14.0.

So it might be that this was already a problem for a longer time, only
just recently uncovered.

> 
> 
> expecting success:
>         # make sure we run a background auto-gc
>         test_commit make-pack &&
>         git repack &&
>         test_config gc.autopacklimit 1 &&
>         test_config gc.autodetach true &&
> 
>         # create a ref whose loose presence we can use to detect a
> pack-refs run
>         git update-ref refs/heads/should-be-loose HEAD &&
>         test_path_is_file .git/refs/heads/should-be-loose &&
> 
>         # now fake a concurrent gc that holds the lock; we can use our
>         # shell pid so that it looks valid.
>         hostname=$(hostname || echo unknown) &&
>         printf "$$ %s" "$hostname" >.git/gc.pid &&
> 
>         # our gc should exit zero without doing anything
>         run_and_wait_for_auto_gc &&
>         test_path_is_file .git/refs/heads/should-be-loose
> 
> [master 28ecdda] make-pack
>  Author: A U Thor <author@xxxxxxxxxxx>
>  1 file changed, 1 insertion(+)
>  create mode 100644 make-pack.t
> Counting objects: 3, done.
> Delta compression using up to 8 threads.
> Compressing objects: 100% (2/2), done.
> Writing objects: 100% (3/3), done.
> Total 3 (delta 0), reused 0 (delta 0)
> Auto packing the repository in background for optimum performance.
> See "git help gc" for manual housekeeping.
> File .git/refs/heads/should-be-loose doesn't exist.
> not ok 8 - background auto gc respects lock for all operations
> #
> #               # make sure we run a background auto-gc
> #               test_commit make-pack &&
> #               git repack &&
> #               test_config gc.autopacklimit 1 &&
> #               test_config gc.autodetach true &&
> #
> #               # create a ref whose loose presence we can use to
> detect a pack-refs run
> #               git update-ref refs/heads/should-be-loose HEAD &&
> #               test_path_is_file .git/refs/heads/should-be-loose &&
> #
> #               # now fake a concurrent gc that holds the lock; we can
> use our
> #               # shell pid so that it looks valid.
> #               hostname=$(hostname || echo unknown) &&
> #               printf "$$ %s" "$hostname" >.git/gc.pid &&
> #
> #               # our gc should exit zero without doing anything
> #               run_and_wait_for_auto_gc &&
> #               test_path_is_file .git/refs/heads/should-be-loose
> #
> 
> # failed 1 among 8 test(s)
> 1..8
> 
> 
> I admit I am mostly blind with the Git gc system.  Should I use strace
> on the git-gc process at the end?  How would I accomplish that?  Is
> there a better way of debugging this error further?
> 
> Core system stats:
> 
> Intel x86_64 E3-1280 v3 @ 3.60 GHz
> musl libc 1.1.16+20
> git 2.14.1, vanilla except for a patch to an earlier test due to
> musl's inability to cope with EUC-JP
> bash 4.3.48(1)-release
> 
> Thank you very much.
> 
> All the best,
> - --arw
> 
> - -- 
> A. Wilcox (awilfox)
> Project Lead, Adélie Linux
> http://adelielinux.org
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