From: Derrick Stolee <derrickstolee@github.com>
To: Patrick Steinhardt <ps@pks.im>,
Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, me@ttaylorr.com, gitster@pobox.com,
abhishekkumar8222@gmail.com
Subject: Re: [PATCH 3/7] commit-graph: start parsing generation v2 (again)
Date: Mon, 28 Feb 2022 11:23:38 -0500 [thread overview]
Message-ID: <e29ec01f-3039-6992-8ade-800ad32fcf34@github.com> (raw)
In-Reply-To: <YhzkdMxrIGlNutr6@ncase>
On 2/28/2022 10:18 AM, Patrick Steinhardt wrote:
> On Thu, Feb 24, 2022 at 08:38:32PM +0000, Derrick Stolee via GitGitGadget wrote:
>> From: Derrick Stolee <derrickstolee@github.com>
...
>> diff --git a/commit-graph.c b/commit-graph.c
>> index a19bd96c2ee..8e52bb09552 100644
>> --- a/commit-graph.c
>> +++ b/commit-graph.c
>> @@ -407,6 +407,9 @@ struct commit_graph *parse_commit_graph(struct repository *r,
>> &graph->chunk_generation_data);
>> pair_chunk(cf, GRAPH_CHUNKID_GENERATION_DATA_OVERFLOW,
>> &graph->chunk_generation_data_overflow);
>> +
>> + if (graph->chunk_generation_data)
>> + graph->read_generation_data = 1;
>> }
>>
>> if (r->settings.commit_graph_read_changed_paths) {
>
> I wanted to test your changes because they seem quite exciting in the
> context of my work as well, but this commit seems to uncover a bug with
> how we handle overflows. I originally triggered the bug when trying to
> do a mirror-fetch, but as it turns it seems to trigger now whenever the
> commit-graph is being read:
>
> $ git commit-graph verify
> fatal: commit-graph requires overflow generation data but has none
>
> $ git commit-graph write --split
> Finding commits for commit graph among packed objects: 100% (10235119/10235119), done.
> fatal: commit-graph requires overflow generation data but has none
>
> $ git commit-graph write --split=replace
> Finding commits for commit graph among packed objects: 100% (10235119/10235119), done.
> fatal: commit-graph requires overflow generation data but has none
>
> I initially assumed this may be a bug with how we previously wrote the
> commit-graph, but removing all chains still reliably triggers it:
>
> $ rm -f objects/info/commit-graphs/*
> $ git commit-graph write --split
> Finding commits for commit graph among packed objects: 100% (10235119/10235119), done.
> fatal: commit-graph requires overflow generation data but has none
>
> I haven't yet found the time to dig deeper into why this is happening.
> While the repository is publicly accessible at [1], unfortunately the
> bug seems to be triggered by a commit that's only kept alive by an
> internal reference.
>
> Patrick
>
> [1]: https://gitlab.com/gitlab-com/www-gitlab-com.git
Thanks for including this information. Just to be clear: did you
include patch 4 in your tests, or not? Patch 4 includes a fix
related to overflow values, so it would be helpful to know if you
found a _different_ bug or if it is the same one.
Thanks,
-Stolee
next prev parent reply other threads:[~2022-02-28 16:23 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-24 20:38 [PATCH 0/7] Commit-graph: Generation Number v2 Fixes, v3 implementation Derrick Stolee via GitGitGadget
2022-02-24 20:38 ` [PATCH 1/7] test-read-graph: include extra post-parse info Derrick Stolee via GitGitGadget
2022-02-24 20:38 ` [PATCH 2/7] commit-graph: fix ordering bug in generation numbers Derrick Stolee via GitGitGadget
2022-02-24 22:15 ` Junio C Hamano
2022-02-25 13:51 ` Derrick Stolee
2022-02-25 17:35 ` Junio C Hamano
2022-02-24 20:38 ` [PATCH 3/7] commit-graph: start parsing generation v2 (again) Derrick Stolee via GitGitGadget
2022-02-28 15:18 ` Patrick Steinhardt
2022-02-28 16:23 ` Derrick Stolee [this message]
2022-02-28 16:59 ` Patrick Steinhardt
2022-02-28 18:44 ` Derrick Stolee
2022-03-01 9:46 ` Patrick Steinhardt
2022-03-01 10:35 ` Patrick Steinhardt
2022-03-01 14:06 ` Derrick Stolee
2022-03-01 14:53 ` Patrick Steinhardt
2022-03-01 15:25 ` Derrick Stolee
2022-03-02 13:57 ` Patrick Steinhardt
2022-03-02 14:57 ` Derrick Stolee
2022-03-02 18:15 ` Junio C Hamano
2022-03-02 18:46 ` Derrick Stolee
2022-03-02 22:42 ` Junio C Hamano
2022-03-03 11:19 ` Patrick Steinhardt
2022-03-03 16:00 ` Derrick Stolee
2022-03-04 14:03 ` Derrick Stolee
2022-03-07 10:34 ` Patrick Steinhardt
2022-03-07 13:45 ` Derrick Stolee
2022-03-07 17:22 ` Junio C Hamano
2022-03-10 13:58 ` Patrick Steinhardt
2022-03-10 17:18 ` Derrick Stolee
2022-02-24 20:38 ` [PATCH 4/7] commit-graph: fix generation number v2 overflow values Derrick Stolee via GitGitGadget
2022-02-24 22:35 ` Junio C Hamano
2022-02-25 13:53 ` Derrick Stolee
2022-02-25 17:38 ` Junio C Hamano
2022-02-24 20:38 ` [PATCH 5/7] commit-graph: document file format v2 Derrick Stolee via GitGitGadget
2022-02-24 22:55 ` Junio C Hamano
2022-02-25 22:31 ` Ævar Arnfjörð Bjarmason
2022-02-28 13:44 ` Derrick Stolee
2022-02-28 14:27 ` Ævar Arnfjörð Bjarmason
2022-02-28 16:39 ` Derrick Stolee
2022-02-28 21:14 ` Ævar Arnfjörð Bjarmason
2022-03-01 14:19 ` Derrick Stolee
2022-03-01 14:29 ` Ævar Arnfjörð Bjarmason
2022-03-01 15:59 ` Derrick Stolee
2022-02-24 20:38 ` [PATCH 6/7] commit-graph: parse " Derrick Stolee via GitGitGadget
2022-02-24 23:01 ` Junio C Hamano
2022-02-25 13:54 ` Derrick Stolee
2022-02-24 20:38 ` [PATCH 7/7] commit-graph: write " Derrick Stolee via GitGitGadget
2022-02-24 21:42 ` [PATCH 0/7] Commit-graph: Generation Number v2 Fixes, v3 implementation Junio C Hamano
2022-02-24 23:06 ` Junio C Hamano
2022-02-25 13:55 ` Derrick Stolee
2022-02-28 13:53 ` [PATCH v2 0/4] Commit-graph: Generation Number v2 Fixes Derrick Stolee via GitGitGadget
2022-02-28 13:53 ` [PATCH v2 1/4] test-read-graph: include extra post-parse info Derrick Stolee via GitGitGadget
2022-02-28 15:22 ` Ævar Arnfjörð Bjarmason
2022-02-28 13:53 ` [PATCH v2 2/4] commit-graph: fix ordering bug in generation numbers Derrick Stolee via GitGitGadget
2022-02-28 15:25 ` Ævar Arnfjörð Bjarmason
2022-02-28 13:53 ` [PATCH v2 3/4] commit-graph: start parsing generation v2 (again) Derrick Stolee via GitGitGadget
2022-02-28 15:30 ` Ævar Arnfjörð Bjarmason
2022-02-28 16:43 ` Derrick Stolee
2022-02-28 13:53 ` [PATCH v2 4/4] commit-graph: fix generation number v2 overflow values Derrick Stolee via GitGitGadget
2022-02-28 15:40 ` Ævar Arnfjörð Bjarmason
2022-03-01 17:23 ` [PATCH v2 0/4] Commit-graph: Generation Number v2 Fixes Ævar Arnfjörð Bjarmason
2022-03-01 19:48 ` [PATCH v3 0/5] " Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 1/5] test-read-graph: include extra post-parse info Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 2/5] t5318: extract helpers to lib-commit-graph.sh Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 3/5] commit-graph: fix ordering bug in generation numbers Derrick Stolee via GitGitGadget
2022-03-01 20:13 ` Junio C Hamano
2022-03-01 20:30 ` Junio C Hamano
2022-03-02 14:13 ` Derrick Stolee
2022-03-01 19:48 ` [PATCH v3 4/5] commit-graph: start parsing generation v2 (again) Derrick Stolee via GitGitGadget
2022-03-01 19:48 ` [PATCH v3 5/5] commit-graph: fix generation number v2 overflow values Derrick Stolee via GitGitGadget
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