From 9eca1358882afaf2fca59c50686db1b8ef681850 Mon Sep 17 00:00:00 2001
From: Grigory Bazilevich <g.bazilevich@ispras.ru>
Date: Wed, 11 Mar 2026 09:45:28 +0300
Subject: syz-manager: information about probability-only inputs in db

---
 pkg/db/db.go           |  1 +
 pkg/fuzzer/fuzzer.go   |  5 +++--
 pkg/manager/seeds.go   | 11 +++++++++--
 syz-manager/manager.go |  7 ++++++-
 4 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/pkg/db/db.go b/pkg/db/db.go
index 3007a8774..5a3d8f539 100644
--- a/pkg/db/db.go
+++ b/pkg/db/db.go
@@ -169,6 +169,7 @@ const (
 	recMagic   = uint32(0xfee1bad)
 	curVersion = uint32(2)
 	seqDeleted = ^uint64(0)
+	SeqProb    = ^uint64(1)
 )
 
 func serializeHeader(w *bytes.Buffer, version uint64) {
diff --git a/pkg/fuzzer/fuzzer.go b/pkg/fuzzer/fuzzer.go
index 3241cb63a..02c5cda08 100644
--- a/pkg/fuzzer/fuzzer.go
+++ b/pkg/fuzzer/fuzzer.go
@@ -360,8 +360,9 @@ const (
 )
 
 type Candidate struct {
-	Prog  *prog.Prog
-	Flags ProgFlags
+	Prog     *prog.Prog
+	Flags    ProgFlags
+	ProbOnly bool
 }
 
 func (fuzzer *Fuzzer) AddCandidates(candidates []Candidate) {
diff --git a/pkg/manager/seeds.go b/pkg/manager/seeds.go
index f17c36ecb..b2a288054 100644
--- a/pkg/manager/seeds.go
+++ b/pkg/manager/seeds.go
@@ -12,6 +12,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -79,8 +80,9 @@ func LoadSeeds(cfg *mgrconfig.Config, immutable bool) (Seeds, error) {
 			flags = fuzzer.ProgMinimized
 		}
 		candidates = append(candidates, fuzzer.Candidate{
-			Prog:  inp.Prog,
-			Flags: flags,
+			Prog:     inp.Prog,
+			Flags:    flags,
+			ProbOnly: inp.Seq == db.SeqProb,
 		})
 	}
 	if err := <-chErr; err != nil {
@@ -101,6 +103,9 @@ func LoadSeeds(cfg *mgrconfig.Config, immutable bool) (Seeds, error) {
 			return Seeds{}, fmt.Errorf("failed to save corpus database: %w", err)
 		}
 	}
+	sort.SliceStable(candidates, func(i, j int) bool {
+		return !candidates[i].ProbOnly && candidates[j].ProbOnly
+	})
 	// Switch database to the mode when it does not keep records in memory.
 	// We don't need them anymore and they consume lots of memory.
 	info.CorpusDB.DiscardData()
@@ -111,6 +116,7 @@ func LoadSeeds(cfg *mgrconfig.Config, immutable bool) (Seeds, error) {
 type input struct {
 	IsSeed bool
 	Key    string
+	Seq    uint64
 	Path   string
 	Data   []byte
 	Prog   *prog.Prog
@@ -138,6 +144,7 @@ func readInputs(cfg *mgrconfig.Config, db *db.DB, output chan *input) error {
 	for key, rec := range db.Records {
 		inputs <- &input{
 			Key:  key,
+			Seq:  rec.Seq,
 			Data: rec.Val,
 		}
 	}
diff --git a/syz-manager/manager.go b/syz-manager/manager.go
index ed985c2fc..77ad2a127 100644
--- a/syz-manager/manager.go
+++ b/syz-manager/manager.go
@@ -411,6 +411,7 @@ func (mgr *Manager) heartbeatLoop() {
 		for _, stat := range stat.Collect(stat.Console) {
 			fmt.Fprintf(buf, "%v=%v ", stat.Name, stat.Value)
 		}
+		fmt.Fprintf(buf, "%v=%v ", "lastMinCorpus", mgr.lastMinCorpus)
 		log.Logf(0, "%s", buf.String())
 	}
 }
@@ -993,8 +994,12 @@ func (mgr *Manager) corpusInputHandler(updates <-chan corpus.NewItemEvent) {
 			// We only save new progs into the corpus.db file.
 			continue
 		}
+		var seq uint64 = 0
+		if update.ProbOnly {
+			seq = db.SeqProb
+		}
 		mgr.corpusDBMu.Lock()
-		mgr.corpusDB.Save(update.Sig, update.ProgData, 0)
+		mgr.corpusDB.Save(update.Sig, update.ProgData, seq)
 		if err := mgr.corpusDB.Flush(); err != nil {
 			log.Errorf("failed to save corpus database: %v", err)
 		}
-- 
cgit mrf-deployment