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Re: [PATCH 2/2] migration: Fix return-path thread exit
From: |
Fabiano Rosas |
Subject: |
Re: [PATCH 2/2] migration: Fix return-path thread exit |
Date: |
Fri, 02 Feb 2024 11:42:18 -0300 |
Cédric Le Goater <clg@redhat.com> writes:
> In case of error, close_return_path_on_source() can perform a shutdown
> to exit the return-path thread. However, in migrate_fd_cleanup(),
> 'to_dst_file' is closed before calling close_return_path_on_source()
> and the shutdown fails, leaving the source and destination waiting for
> an event to occur.
At close_return_path_on_source, qemu_file_shutdown() and checking
ms->to_dst_file are done under the qemu_file_lock, so how could
migrate_fd_cleanup() have cleared the pointer but the ms->to_dst_file
check have passed?
>
> Close the file after calling close_return_path_on_source() so that the
> shutdown succeeds and the return-path thread exits.
>
> Signed-off-by: Cédric Le Goater <clg@redhat.com>
> ---
> migration/migration.c | 12 +++++-------
> 1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/migration/migration.c b/migration/migration.c
> index
> 2c3362235c7651c11d581f3c3639571f1f9636ef..1e0b6acaedc272e8ce26ad40be2c42177f5fd14e
> 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -1314,6 +1314,7 @@ void migrate_set_state(int *state, int old_state, int
> new_state)
> static void migrate_fd_cleanup(MigrationState *s)
> {
> int file_error = 0;
> + QEMUFile *tmp = NULL;
>
> g_free(s->hostname);
> s->hostname = NULL;
> @@ -1323,8 +1324,6 @@ static void migrate_fd_cleanup(MigrationState *s)
> qemu_savevm_state_cleanup();
>
> if (s->to_dst_file) {
> - QEMUFile *tmp;
> -
> trace_migrate_fd_cleanup();
> bql_unlock();
> if (s->migration_thread_running) {
> @@ -1344,15 +1343,14 @@ static void migrate_fd_cleanup(MigrationState *s)
> * critical section won't block for long.
> */
> migration_ioc_unregister_yank_from_file(tmp);
> - qemu_fclose(tmp);
> }
>
> - /*
> - * We already cleaned up to_dst_file, so errors from the return
> - * path might be due to that, ignore them.
> - */
> close_return_path_on_source(s, file_error);
>
> + if (tmp) {
> + qemu_fclose(tmp);
> + }
> +
> assert(!migration_is_active(s));
>
> if (s->state == MIGRATION_STATUS_CANCELLING) {
Re: [PATCH 0/2] migration: Fix return-path thread exit, Peter Xu, 2024/02/02