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| author | Andrew Au <cshung@gmail.com> | 2026-03-12 21:49:37 +0000 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2026-03-12 14:51:50 -0700 |
| commit | dd3693eb0859274d62feac8047e1d486b3beaf31 (patch) | |
| tree | fa627c35b351b91032f0e760d5add5808db01ae4 | |
| parent | 7f19e4e1b6a3ad259e2ed66033e01e03b8b74c5e (diff) | |
| download | git-dd3693eb0859274d62feac8047e1d486b3beaf31.tar.xz | |
transport-helper, connect: use clean_on_exit to reap children on abnormal exit
When a long-running service (e.g., a source indexer) runs as PID 1
inside a container and repeatedly spawns git, git may in turn spawn
child processes such as git-remote-https or ssh. If git exits abnormally
(e.g., via exit(128) on a transport error), the normal cleanup paths
(disconnect_helper, finish_connect) are bypassed, and these children are
never waited on. The children are reparented to PID 1, which does not
reap them, so they accumulate as zombies over time.
Set clean_on_exit and wait_after_clean on child_process structs in both
transport-helper.c and connect.c so that the existing run-command
cleanup infrastructure handles reaping on any exit path. This avoids
rolling custom atexit handlers that call finish_command(), which could
deadlock if the child is blocked waiting for the parent to close a pipe.
The clean_on_exit mechanism sends SIGTERM first, then waits, ensuring
the child terminates promptly. It also handles signal-based exits, not
just atexit.
Signed-off-by: Andrew Au <cshung@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
| -rw-r--r-- | connect.c | 4 | ||||
| -rw-r--r-- | transport-helper.c | 2 |
2 files changed, 6 insertions, 0 deletions
@@ -1054,6 +1054,8 @@ static struct child_process *git_proxy_connect(int fd[2], char *host) strvec_push(&proxy->args, port); proxy->in = -1; proxy->out = -1; + proxy->clean_on_exit = 1; + proxy->wait_after_clean = 1; if (start_command(proxy)) die(_("cannot start proxy %s"), git_proxy_command); fd[0] = proxy->out; /* read from proxy stdout */ @@ -1515,6 +1517,8 @@ struct child_process *git_connect(int fd[2], const char *url, } strvec_push(&conn->args, cmd.buf); + conn->clean_on_exit = 1; + conn->wait_after_clean = 1; if (start_command(conn)) die(_("unable to fork")); diff --git a/transport-helper.c b/transport-helper.c index 4d95d84f9e..570d7c6439 100644 --- a/transport-helper.c +++ b/transport-helper.c @@ -154,6 +154,8 @@ static struct child_process *get_helper(struct transport *transport) helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */ + helper->clean_on_exit = 1; + helper->wait_after_clean = 1; code = start_command(helper); if (code < 0 && errno == ENOENT) die(_("unable to find remote helper for '%s'"), data->name); |