[PATCH i-g-t 2/3] lib/eudebug: Fix xe_eudebug_client_stop corner case

[Mika Kuoppala]

Dominik Karol Piątkowski <dominik.karol.piatkowski at intel.com> writes:

> After `token_signal(c->p_in, CLIENT_STOP, c->pid)`, the client is
> expected to end its work and exit. By the time the waitpid() is called,
> the client process may be gone already, resulting in a failed assert.
>
> Fix it by skipping the assert in case of errno being ECHILD, meaning
> the process already exited.
>
> Signed-off-by: Dominik Karol Piątkowski <dominik.karol.piatkowski at intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

> ---
>  lib/xe/xe_eudebug.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/lib/xe/xe_eudebug.c b/lib/xe/xe_eudebug.c
> index ad8bdf68a..58acb1dea 100644
> --- a/lib/xe/xe_eudebug.c
> +++ b/lib/xe/xe_eudebug.c
> @@ -1450,12 +1450,16 @@ void xe_eudebug_client_stop(struct xe_eudebug_client *c)
>  {
>  	if (c->pid) {
>  		int waitstatus;
> +		int ret;
>  
>  		xe_eudebug_client_wait_done(c);
>  
>  		token_signal(c->p_in, CLIENT_STOP, c->pid);
> -		igt_assert_eq(waitpid(c->pid, &waitstatus, 0),
> -			      c->pid);
> +		ret = waitpid(c->pid, &waitstatus, 0);
> +		/* process may be gone already */
> +		if (!(ret == -1 && errno == ECHILD))
> +			igt_assert_eq(ret, c->pid);
> +
>  		c->pid = 0;
>  	}
>  }
> -- 
> 2.34.1