[pve-devel] applied: [PATCH qemu] PVE: fix aborting multiple 'CREATED' jobs in sequential transaction
Wolfgang Bumiller
w.bumiller at proxmox.com
Thu Jan 7 11:23:26 CET 2021
applied
On Mon, Jan 04, 2021 at 02:49:14PM +0100, Stefan Reiter wrote:
> Deadlocks could occur in the AIO_WAIT_WHILE loop in job_finish_sync,
> which would wait for CREATED but not running jobs to complete, even
> though job_enter is a no-op in that scenario. Mark offending jobs as
> ABORTING immediately via job_update_rc if required.
>
> Manifested itself in cancelling or failing backups with more than 2
> drives.
>
> Signed-off-by: Stefan Reiter <s.reiter at proxmox.com>
> ---
>
> Potential fix for #3225 and related forum threads:
> https://forum.proxmox.com/threads/problem-mit-backup.80418/
> https://forum.proxmox.com/threads/vm-hard-freezes-on-backup.81752/
>
> job.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/job.c b/job.c
> index 97ee97a192..51984e557c 100644
> --- a/job.c
> +++ b/job.c
> @@ -1035,6 +1035,13 @@ int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp)
> return -EBUSY;
> }
>
> + /* in a sequential transaction jobs with status CREATED can appear at time
> + * of cancelling, these have not begun work so job_enter won't do anything,
> + * let's ensure they are marked as ABORTING if required */
> + if (job->status == JOB_STATUS_CREATED && job->txn->sequential) {
> + job_update_rc(job);
> + }
> +
> AIO_WAIT_WHILE(job->aio_context,
> (job_enter(job), !job_is_completed(job)));
>
> --
> 2.20.1
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