Re: [PATCH 5/8] trace: fix race in debug dump

[Jerin Jacob <jerinjacobk@gmail.com>]

On Wed, Sep 21, 2022 at 5:35 PM David Marchand
<david.marchand@redhat.com> wrote:
>
> trace->nb_trace_mem_list access must be under trace->lock to avoid
> races with threads allocating/freeing their trace buffers.
>
> Fixes: f6b2d65dcd5d ("trace: implement debug dump")
> Cc: stable@dpdk.org
>
> Signed-off-by: David Marchand <david.marchand@redhat.com>

Acked-by: Jerin Jacob <jerinj@marvell.com>


> ---
>  lib/eal/common/eal_common_trace.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/lib/eal/common/eal_common_trace.c b/lib/eal/common/eal_common_trace.c
> index afc4c6dbe5..5280aa7d62 100644
> --- a/lib/eal/common/eal_common_trace.c
> +++ b/lib/eal/common/eal_common_trace.c
> @@ -255,10 +255,9 @@ trace_lcore_mem_dump(FILE *f)
>         struct __rte_trace_header *header;
>         uint32_t count;
>
> -       if (trace->nb_trace_mem_list == 0)
> -               return;
> -
>         rte_spinlock_lock(&trace->lock);
> +       if (trace->nb_trace_mem_list == 0)
> +               goto out;
>         fprintf(f, "nb_trace_mem_list = %d\n", trace->nb_trace_mem_list);
>         fprintf(f, "\nTrace mem info\n--------------\n");
>         for (count = 0; count < trace->nb_trace_mem_list; count++) {
> @@ -269,6 +268,7 @@ trace_lcore_mem_dump(FILE *f)
>                 header->stream_header.lcore_id,
>                 header->stream_header.thread_name);
>         }
> +out:
>         rte_spinlock_unlock(&trace->lock);
>  }
>
> --
> 2.37.3
>