This is a note to let you know that I've just added the patch titled tracing: Fix issue of missing one synthetic field to the 6.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tracing-fix-issue-of-missing-one-synthetic-field.patch and it can be found in the queue-6.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ff4837f7fe59ff018eca4705a70eca5e0b486b97 Mon Sep 17 00:00:00 2001 From: Zheng Yejian <zhengyejian1@xxxxxxxxxx> Date: Wed, 7 Dec 2022 17:15:57 +0800 Subject: tracing: Fix issue of missing one synthetic field From: Zheng Yejian <zhengyejian1@xxxxxxxxxx> commit ff4837f7fe59ff018eca4705a70eca5e0b486b97 upstream. The maximum number of synthetic fields supported is defined as SYNTH_FIELDS_MAX which value currently is 64, but it actually fails when try to generate a synthetic event with 64 fields by executing like: # echo "my_synth_event int v1; int v2; int v3; int v4; int v5; int v6;\ int v7; int v8; int v9; int v10; int v11; int v12; int v13; int v14;\ int v15; int v16; int v17; int v18; int v19; int v20; int v21; int v22;\ int v23; int v24; int v25; int v26; int v27; int v28; int v29; int v30;\ int v31; int v32; int v33; int v34; int v35; int v36; int v37; int v38;\ int v39; int v40; int v41; int v42; int v43; int v44; int v45; int v46;\ int v47; int v48; int v49; int v50; int v51; int v52; int v53; int v54;\ int v55; int v56; int v57; int v58; int v59; int v60; int v61; int v62;\ int v63; int v64" >> /sys/kernel/tracing/synthetic_events Correct the field counting to fix it. Link: https://lore.kernel.org/linux-trace-kernel/20221207091557.3137904-1-zhengyejian1@xxxxxxxxxx Cc: <mhiramat@xxxxxxxxxx> Cc: <zanussi@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Fixes: c9e759b1e845 ("tracing: Rework synthetic event command parsing") Signed-off-by: Zheng Yejian <zhengyejian1@xxxxxxxxxx> Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/trace/trace_events_synth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/trace/trace_events_synth.c +++ b/kernel/trace/trace_events_synth.c @@ -1282,12 +1282,12 @@ static int __create_synth_event(const ch goto err_free_arg; } - fields[n_fields++] = field; if (n_fields == SYNTH_FIELDS_MAX) { synth_err(SYNTH_ERR_TOO_MANY_FIELDS, 0); ret = -EINVAL; goto err_free_arg; } + fields[n_fields++] = field; n_fields_this_loop++; } Patches currently in stable-queue which might be from zhengyejian1@xxxxxxxxxx are queue-6.0/tracing-fix-issue-of-missing-one-synthetic-field.patch queue-6.0/tracing-hist-fix-wrong-return-value-in-parse_action_params.patch queue-6.0/tracing-hist-fix-out-of-bound-write-on-action_data.var_ref_idx.patch