[DTrace-devel] [PATCH] uprobe: do not call populate_args() for pid probes

[Eugene Loh]

Reviewed-by: Eugene Loh <eugene.loh at oracle.com>

FWIW, with every patch I wonder:  "Are there any test issues?" (Like, 
should we test something here?  Were we?  Etc.)  I assume in this 
particular case, problems were revealed by patch "Fix various memory 
leaks related to stapsdt and usdt probes" on tests
     test/unittest/usdt/tst.pidargmap.sh
     test/unittest/usdt/tst.pidargs.sh
     test/unittest/usdt/tst.pidprobes.sh
The present patch is simply to remediate those revealed problems. To me, 
that sort of information is useful in a commit message.

On 8/13/25 23:58, Kris Van Hees via DTrace-devel wrote:
> Only USDT (regular and is-enabled) probes need populate_args().
>
> Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>
> ---
>   libdtrace/dt_prov_uprobe.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/libdtrace/dt_prov_uprobe.c b/libdtrace/dt_prov_uprobe.c
> index c63d58383..605ae8397 100644
> --- a/libdtrace/dt_prov_uprobe.c
> +++ b/libdtrace/dt_prov_uprobe.c
> @@ -994,8 +994,10 @@ static dt_probe_t *create_underlying(dtrace_hdl_t *dtp,
>   		 */
>   	}
>   
> -	if (populate_args(dtp, psp, upp) < 0)
> -		goto fail;
> +	if (upp->flags & (PP_IS_ENABLED | PP_IS_USDT)) {
> +		if (populate_args(dtp, psp, upp) < 0)
> +			goto fail;
> +	}
>   
>   	return uprp;
>