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Subject[PATCH 5.4 045/104] tracing: Fix histogram code when expression has same var as value
From: Steven Rostedt (VMware) <>

commit 8bcebc77e85f3d7536f96845a0fe94b1dddb6af0 upstream.

While working on a tool to convert SQL syntex into the histogram language of
the kernel, I discovered the following bug:

# echo 'first u64 start_time u64 end_time pid_t pid u64 delta' >> synthetic_events
# echo 'hist:keys=pid:start=common_timestamp' > events/sched/sched_waking/trigger
# echo 'hist:keys=next_pid:delta=common_timestamp-$start,start2=$start:onmatch(sched.sched_waking).trace(first,$start2,common_timestamp,next_pid,$delta)' > events/sched/sched_switch/trigger

Would not display any histograms in the sched_switch histogram side.

But if I were to swap the location of

"delta=common_timestamp-$start" with "start2=$start"

Such that the last line had:

# echo 'hist:keys=next_pid:start2=$start,delta=common_timestamp-$start:onmatch(sched.sched_waking).trace(first,$start2,common_timestamp,next_pid,$delta)' > events/sched/sched_switch/trigger

The histogram works as expected.

What I found out is that the expressions clear out the value once it is
resolved. As the variables are resolved in the order listed, when


The $start is cleared. When it gets to "start2=$start", it errors out with
"unresolved symbol" (which is silent as this happens at the location of the
trace), and the histogram is dropped.

When processing the histogram for variable references, instead of adding a
new reference for a variable used twice, use the same reference. That way,
not only is it more efficient, but the order will no longer matter in
processing of the variables.

>From Tom Zanussi:

"Just to clarify some more about what the problem was is that without
your patch, we would have two separate references to the same variable,
and during resolve_var_refs(), they'd both want to be resolved
separately, so in this case, since the first reference to start wasn't
part of an expression, it wouldn't get the read-once flag set, so would
be read normally, and then the second reference would do the read-once
read and also be read but using read-once. So everything worked and
you didn't see a problem:

from: start2=$start,delta=common_timestamp-$start

In the second case, when you switched them around, the first reference
would be resolved by doing the read-once, and following that the second
reference would try to resolve and see that the variable had already
been read, so failed as unset, which caused it to short-circuit out and
not do the trigger action to generate the synthetic event:

to: delta=common_timestamp-$start,start2=$start

With your patch, we only have the single resolution which happens
correctly the one time it's resolved, so this can't happen."


Fixes: 067fe038e70f6 ("tracing: Add variable reference handling to hist triggers")
Reviewed-by: Tom Zanuss <>
Tested-by: Tom Zanussi <>
Signed-off-by: Steven Rostedt (VMware) <>
Signed-off-by: Greg Kroah-Hartman <>

kernel/trace/trace_events_hist.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -116,6 +116,7 @@ struct hist_field {
struct ftrace_event_field *field;
unsigned long flags;
hist_field_fn_t fn;
+ unsigned int ref;
unsigned int size;
unsigned int offset;
unsigned int is_signed;
@@ -2427,8 +2428,16 @@ static int contains_operator(char *str)
return field_op;

+static void get_hist_field(struct hist_field *hist_field)
+ hist_field->ref++;
static void __destroy_hist_field(struct hist_field *hist_field)
+ if (--hist_field->ref > 1)
+ return;
@@ -2470,6 +2479,8 @@ static struct hist_field *create_hist_fi
if (!hist_field)
return NULL;

+ hist_field->ref = 1;
hist_field->hist_data = hist_data;

if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
@@ -2665,6 +2676,17 @@ static struct hist_field *create_var_ref
unsigned long flags = HIST_FIELD_FL_VAR_REF;
struct hist_field *ref_field;
+ int i;
+ /* Check if the variable already exists */
+ for (i = 0; i < hist_data->n_var_refs; i++) {
+ ref_field = hist_data->var_refs[i];
+ if (ref_field->var.idx == var_field->var.idx &&
+ ref_field->var.hist_data == var_field->hist_data) {
+ get_hist_field(ref_field);
+ return ref_field;
+ }
+ }

ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
if (ref_field) {

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