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From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: Taylor Blau <me@ttaylorr.com>
Cc: git@vger.kernel.org, peff@peff.net, dstolee@microsoft.com,
	gitster@pobox.com
Subject: Re: [PATCH 1/3] builtin/commit-graph.c: support '--split[=<strategy>]'
Date: Sat, 1 Feb 2020 00:34:34 +0100	[thread overview]
Message-ID: <20200131233434.GJ10482@szeder.dev> (raw)
In-Reply-To: <4f5bc19903f8a1f5b153b5665de378e743e12744.1580430057.git.me@ttaylorr.com>

On Thu, Jan 30, 2020 at 04:28:17PM -0800, Taylor Blau wrote:
> diff --git a/commit-graph.c b/commit-graph.c
> index 6d34829f57..02e6ad9d1f 100644
> --- a/commit-graph.c
> +++ b/commit-graph.c
> @@ -1565,15 +1565,18 @@ static void split_graph_merge_strategy(struct write_commit_graph_context *ctx)
>  	num_commits = ctx->commits.nr;
>  	ctx->num_commit_graphs_after = ctx->num_commit_graphs_before + 1;
>  
> -	while (g && (g->num_commits <= size_mult * num_commits ||
> -		    (max_commits && num_commits > max_commits))) {
> -		if (g->odb != ctx->odb)
> -			break;
> +	if (ctx->split_opts->flags != COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED) {

This line segfaults in the tests 'fetch.writeCommitGraph' and
'fetch.writeCommitGraph with submodules' in 't5510-fetch.sh', because
'git fetch' doesn't pass a 'split_opts' to the commit-graph functions.

Thread 1 "git" received signal SIGSEGV, Segmentation fault.
0x00000000005113dd in split_graph_merge_strategy (ctx=0x9ca930)
    at commit-graph.c:1568
1568            if (ctx->split_opts->flags != COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED) {
(gdb) p *ctx
$1 = {r = 0x9ae2a0 <the_repo>, odb = 0x9c0df0, graph_name = 0x0, oids = {
    list = 0xa02660, nr = 12, alloc = 1024}, commits = {list = 0x9caa00, 
    nr = 6, alloc = 6}, num_extra_edges = 0, approx_nr_objects = 0, 
  progress = 0x0, progress_done = 0, progress_cnt = 0, base_graph_name = 0x0, 
  num_commit_graphs_before = 0, num_commit_graphs_after = 1, 
  commit_graph_filenames_before = 0x0, commit_graph_filenames_after = 0x0, 
  commit_graph_hash_after = 0x0, new_num_commits_in_base = 0, 
  new_base_graph = 0x0, append = 0, report_progress = 1, split = 1, 
  check_oids = 0, split_opts = 0x0}
                  ^^^^^^^^^^^^^^^^
(gdb) bt
#0  0x00000000005113dd in split_graph_merge_strategy (ctx=0x9ca930)
    at commit-graph.c:1568
#1  0x0000000000512446 in write_commit_graph (odb=0x9c0df0, pack_indexes=0x0, 
    commit_hex=0x7fffffffd550, 
    flags=(COMMIT_GRAPH_WRITE_PROGRESS | COMMIT_GRAPH_WRITE_SPLIT), 
    split_opts=0x0) at commit-graph.c:1891
#2  0x000000000050fd86 in write_commit_graph_reachable (odb=0x9c0df0, 
    flags=(COMMIT_GRAPH_WRITE_PROGRESS | COMMIT_GRAPH_WRITE_SPLIT), 
    split_opts=0x0) at commit-graph.c:1174
    ^^^^^^^^^^^^^^
#3  0x0000000000444ea4 in cmd_fetch (argc=0, argv=0x7fffffffd9b8, prefix=0x0)
    at builtin/fetch.c:1873
#4  0x0000000000406154 in run_builtin (p=0x969a88 <commands+840>, argc=2, 
    argv=0x7fffffffd9b0) at git.c:444
#5  0x00000000004064a4 in handle_builtin (argc=2, argv=0x7fffffffd9b0)
    at git.c:674
#6  0x000000000040674c in run_argv (argcp=0x7fffffffd84c, argv=0x7fffffffd840)
    at git.c:741
#7  0x0000000000406bbd in cmd_main (argc=2, argv=0x7fffffffd9b0) at git.c:872
#8  0x00000000004cfd4e in main (argc=5, argv=0x7fffffffd998)
    at common-main.c:52

Note that this function split_graph_merge_strategy() does look at
various fields in 'ctx->split_opts' a bit earlier, but those accesses
are protected by a 'if (ctx->split_opts)' condition.
expire_commit_graphs() does the same.


> +		while (g && (g->num_commits <= size_mult * num_commits ||
> +			    (max_commits && num_commits > max_commits) ||
> +			    (ctx->split_opts->flags == COMMIT_GRAPH_SPLIT_MERGE_REQUIRED))) {
> +			if (g->odb != ctx->odb)
> +				break;
>  
> -		num_commits += g->num_commits;
> -		g = g->base_graph;
> +			num_commits += g->num_commits;
> +			g = g->base_graph;
>  
> -		ctx->num_commit_graphs_after--;
> +			ctx->num_commit_graphs_after--;
> +		}
>  	}
>  

  parent reply	other threads:[~2020-01-31 23:34 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-31  0:28 [PATCH 0/3] builtin/commit-graph.c: new split/merge options Taylor Blau
2020-01-31  0:28 ` [PATCH 1/3] builtin/commit-graph.c: support '--split[=<strategy>]' Taylor Blau
2020-01-31 14:19   ` Derrick Stolee
2020-02-04  3:47     ` Taylor Blau
2020-01-31 19:27   ` Martin Ågren
2020-02-04  4:06     ` Taylor Blau
2020-02-06 19:15       ` Martin Ågren
2020-02-09 23:27         ` Taylor Blau
2020-01-31 23:34   ` SZEDER Gábor [this message]
2020-02-01 21:25     ` Johannes Schindelin
2020-02-03 10:47       ` SZEDER Gábor
2020-02-03 11:11         ` Jeff King
2020-02-04  3:58           ` Taylor Blau
2020-02-04 14:14             ` Jeff King
2020-02-04  3:59       ` Taylor Blau
2020-02-04  3:59     ` Taylor Blau
2020-01-31  0:28 ` [PATCH 2/3] builtin/commit-graph.c: introduce '--input=<source>' Taylor Blau
2020-01-31 14:40   ` Derrick Stolee
2020-02-04  4:21     ` Taylor Blau
2020-01-31 19:34   ` Martin Ågren
2020-02-04  4:51     ` Taylor Blau
2020-02-13 11:33       ` SZEDER Gábor
2020-02-13 11:48         ` SZEDER Gábor
2020-02-13 17:56           ` Taylor Blau
2020-01-31  0:28 ` [PATCH 3/3] builtin/commit-graph.c: support '--input=none' Taylor Blau
2020-01-31 14:40   ` Derrick Stolee
2020-01-31 19:45   ` Martin Ågren
2020-02-04  5:01     ` Taylor Blau
2020-01-31  0:32 ` [PATCH 0/3] builtin/commit-graph.c: new split/merge options Taylor Blau
2020-01-31 13:26   ` Derrick Stolee
2020-01-31 14:41 ` Derrick Stolee
2020-02-04 23:44 ` Junio C Hamano
2020-02-05  0:30   ` Taylor Blau
2020-02-05  0:28 ` [PATCH v2 " Taylor Blau
2020-02-05  0:28   ` [PATCH v2 1/3] builtin/commit-graph.c: support '--split[=<strategy>]' Taylor Blau
2020-02-06 19:41     ` Martin Ågren
2020-02-07 15:48       ` Derrick Stolee
2020-02-09 23:32         ` Taylor Blau
2020-02-12  6:03         ` Martin Ågren
2020-02-12 20:50           ` Taylor Blau
2020-02-09 23:30       ` Taylor Blau
2020-02-05  0:28   ` [PATCH v2 2/3] builtin/commit-graph.c: introduce '--input=<source>' Taylor Blau
2020-02-05  0:28   ` [PATCH v2 3/3] builtin/commit-graph.c: support '--input=none' Taylor Blau
2020-02-06 19:50     ` Martin Ågren
2020-02-09 23:32       ` Taylor Blau
2020-02-05 20:07   ` [PATCH v2 0/3] builtin/commit-graph.c: new split/merge options Junio C Hamano
2020-02-12  5:47 ` [PATCH v3 " Taylor Blau
2020-02-12  5:47   ` [PATCH v3 1/3] builtin/commit-graph.c: support '--split[=<strategy>]' Taylor Blau
2020-02-12  5:47   ` [PATCH v3 2/3] builtin/commit-graph.c: introduce '--input=<source>' Taylor Blau
2020-02-12  5:47   ` [PATCH v3 3/3] builtin/commit-graph.c: support '--input=none' Taylor Blau
2020-02-13 11:39     ` SZEDER Gábor
2020-02-13 12:31     ` SZEDER Gábor
2020-02-13 16:08       ` Junio C Hamano
2020-02-13 17:58         ` Taylor Blau
2020-02-13 17:56       ` Taylor Blau
2020-02-12 18:19   ` [PATCH v3 0/3] builtin/commit-graph.c: new split/merge options Junio C Hamano
2020-02-13 17:41     ` Taylor Blau
2020-02-17 18:24   ` Martin Ågren

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