/
reporting.go
1544 lines (1475 loc) · 47.4 KB
/
reporting.go
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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package main
import (
"bytes"
"encoding/json"
"fmt"
"math"
"reflect"
"sort"
"strings"
"time"
"github.com/google/syzkaller/dashboard/dashapi"
"github.com/google/syzkaller/pkg/email"
"github.com/google/syzkaller/pkg/html"
"github.com/google/syzkaller/sys/targets"
"golang.org/x/net/context"
db "google.golang.org/appengine/v2/datastore"
"google.golang.org/appengine/v2/log"
)
// Backend-independent reporting logic.
// Two main entry points:
// - reportingPoll is called by backends to get list of bugs that need to be reported.
// - incomingCommand is called by backends to update bug statuses.
const (
maxMailReportLen = 64 << 10
maxInlineError = 16 << 10
notifyResendPeriod = 14 * 24 * time.Hour
notifyAboutBadCommitPeriod = 90 * 24 * time.Hour
never = 100 * 365 * 24 * time.Hour
internalError = "internal error"
// This is embedded as first line of syzkaller reproducer files.
syzReproPrefix = "# See https://goo.gl/kgGztJ for information about syzkaller reproducers.\n"
)
// reportingPoll is called by backends to get list of bugs that need to be reported.
func reportingPollBugs(c context.Context, typ string) []*dashapi.BugReport {
state, err := loadReportingState(c)
if err != nil {
log.Errorf(c, "%v", err)
return nil
}
bugs, _, err := loadOpenBugs(c)
if err != nil {
log.Errorf(c, "%v", err)
return nil
}
log.Infof(c, "fetched %v bugs", len(bugs))
sort.Sort(bugReportSorter(bugs))
var reports []*dashapi.BugReport
for _, bug := range bugs {
rep, err := handleReportBug(c, typ, state, bug)
if err != nil {
log.Errorf(c, "%v: failed to report bug %v: %v", bug.Namespace, bug.Title, err)
continue
}
if rep == nil {
continue
}
reports = append(reports, rep)
// Trying to report too many at once is known to cause OOMs.
// But new bugs appear incrementally and polling is frequent enough,
// so reporting lots of bugs at once is also not necessary.
if len(reports) == 3 {
break
}
}
return reports
}
func handleReportBug(c context.Context, typ string, state *ReportingState, bug *Bug) (
*dashapi.BugReport, error) {
reporting, bugReporting, _, _, _, err := needReport(c, typ, state, bug)
if err != nil || reporting == nil {
return nil, err
}
crash, crashKey, err := findCrashForBug(c, bug)
if err != nil {
return nil, err
} else if crash == nil {
return nil, fmt.Errorf("no crashes")
}
rep, err := createBugReport(c, bug, crash, crashKey, bugReporting, reporting)
if err != nil {
return nil, err
}
log.Infof(c, "bug %q: reporting to %v", bug.Title, reporting.Name)
return rep, nil
}
func needReport(c context.Context, typ string, state *ReportingState, bug *Bug) (
reporting *Reporting, bugReporting *BugReporting, reportingIdx int,
status, link string, err error) {
reporting, bugReporting, reportingIdx, status, err = currentReporting(c, bug)
if err != nil || reporting == nil {
return
}
if typ != "" && typ != reporting.Config.Type() {
status = "on a different reporting"
reporting, bugReporting = nil, nil
return
}
link = bugReporting.Link
if !bugReporting.Reported.IsZero() && bugReporting.ReproLevel >= bug.HeadReproLevel {
status = fmt.Sprintf("%v: reported%v on %v",
reporting.DisplayTitle, reproStr(bugReporting.ReproLevel),
html.FormatTime(bugReporting.Reported))
reporting, bugReporting = nil, nil
return
}
ent := state.getEntry(timeNow(c), bug.Namespace, reporting.Name)
cfg := getNsConfig(c, bug.Namespace)
if timeSince(c, bug.FirstTime) < cfg.ReportingDelay {
status = fmt.Sprintf("%v: initial reporting delay", reporting.DisplayTitle)
reporting, bugReporting = nil, nil
return
}
if crashNeedsRepro(bug.Title) && bug.ReproLevel < ReproLevelC &&
timeSince(c, bug.FirstTime) < cfg.WaitForRepro {
status = fmt.Sprintf("%v: waiting for C repro", reporting.DisplayTitle)
reporting, bugReporting = nil, nil
return
}
if !cfg.MailWithoutReport && !bug.HasReport {
status = fmt.Sprintf("%v: no report", reporting.DisplayTitle)
reporting, bugReporting = nil, nil
return
}
if bug.NumCrashes == 0 {
status = fmt.Sprintf("%v: no crashes!", reporting.DisplayTitle)
reporting, bugReporting = nil, nil
return
}
// Limit number of reports sent per day.
if ent.Sent >= reporting.DailyLimit {
status = fmt.Sprintf("%v: out of quota for today", reporting.DisplayTitle)
reporting, bugReporting = nil, nil
return
}
// Ready to be reported.
// This update won't be committed, but it is useful as a best effort measure
// so that we don't overflow the limit in a single poll.
ent.Sent++
status = fmt.Sprintf("%v: ready to report", reporting.DisplayTitle)
if !bugReporting.Reported.IsZero() {
status += fmt.Sprintf(" (reported%v on %v)",
reproStr(bugReporting.ReproLevel), html.FormatTime(bugReporting.Reported))
}
return
}
func reportingPollNotifications(c context.Context, typ string) []*dashapi.BugNotification {
bugs, _, err := loadOpenBugs(c)
if err != nil {
log.Errorf(c, "%v", err)
return nil
}
log.Infof(c, "fetched %v bugs", len(bugs))
var notifs []*dashapi.BugNotification
for _, bug := range bugs {
if getNsConfig(c, bug.Namespace).Decommissioned {
continue
}
notif, err := handleReportNotif(c, typ, bug)
if err != nil {
log.Errorf(c, "%v: failed to create bug notif %v: %v", bug.Namespace, bug.Title, err)
continue
}
if notif == nil {
continue
}
notifs = append(notifs, notif)
if len(notifs) >= 10 {
break // don't send too many at once just in case
}
}
return notifs
}
func handleReportNotif(c context.Context, typ string, bug *Bug) (*dashapi.BugNotification, error) {
reporting, bugReporting, _, _, err := currentReporting(c, bug)
if err != nil || reporting == nil {
return nil, nil
}
if typ != "" && typ != reporting.Config.Type() {
return nil, nil
}
if bug.Status != BugStatusOpen || bugReporting.Reported.IsZero() {
return nil, nil
}
for _, f := range notificationGenerators {
notif, err := f(c, bug, reporting, bugReporting)
if notif != nil || err != nil {
return notif, err
}
}
return nil, nil
}
var notificationGenerators = []func(context.Context, *Bug, *Reporting,
*BugReporting) (*dashapi.BugNotification, error){
// Embargo upstreaming.
func(c context.Context, bug *Bug, reporting *Reporting,
bugReporting *BugReporting) (*dashapi.BugNotification, error) {
if reporting.moderation &&
reporting.Embargo != 0 &&
len(bug.Commits) == 0 &&
bugReporting.OnHold.IsZero() &&
timeSince(c, bugReporting.Reported) > reporting.Embargo {
log.Infof(c, "%v: upstreaming (embargo): %v", bug.Namespace, bug.Title)
return createNotification(c, dashapi.BugNotifUpstream, true, "", bug, reporting, bugReporting)
}
return nil, nil
},
// Upstreaming.
func(c context.Context, bug *Bug, reporting *Reporting,
bugReporting *BugReporting) (*dashapi.BugNotification, error) {
if reporting.moderation &&
len(bug.Commits) == 0 &&
bugReporting.OnHold.IsZero() &&
reporting.Filter(bug) == FilterSkip {
log.Infof(c, "%v: upstreaming (skip): %v", bug.Namespace, bug.Title)
return createNotification(c, dashapi.BugNotifUpstream, true, "", bug, reporting, bugReporting)
}
return nil, nil
},
// Obsoleting.
func(c context.Context, bug *Bug, reporting *Reporting,
bugReporting *BugReporting) (*dashapi.BugNotification, error) {
if len(bug.Commits) == 0 &&
bug.canBeObsoleted(c) &&
timeSince(c, bug.LastActivity) > notifyResendPeriod &&
timeSince(c, bug.LastTime) > bug.obsoletePeriod(c) {
log.Infof(c, "%v: obsoleting: %v", bug.Namespace, bug.Title)
why := bugObsoletionReason(bug)
return createNotification(c, dashapi.BugNotifObsoleted, false, string(why), bug, reporting, bugReporting)
}
return nil, nil
},
// Bad commit.
func(c context.Context, bug *Bug, reporting *Reporting,
bugReporting *BugReporting) (*dashapi.BugNotification, error) {
if len(bug.Commits) > 0 &&
len(bug.PatchedOn) == 0 &&
timeSince(c, bug.LastActivity) > notifyResendPeriod &&
timeSince(c, bug.FixTime) > notifyAboutBadCommitPeriod {
log.Infof(c, "%v: bad fix commit: %v", bug.Namespace, bug.Title)
commits := strings.Join(bug.Commits, "\n")
return createNotification(c, dashapi.BugNotifBadCommit, true, commits, bug, reporting, bugReporting)
}
return nil, nil
},
// Label notifications.
func(c context.Context, bug *Bug, reporting *Reporting,
bugReporting *BugReporting) (*dashapi.BugNotification, error) {
for _, label := range bug.Labels {
if label.SetBy != "" {
continue
}
str := label.String()
if reporting.Labels[str] == "" {
continue
}
if stringInList(bugReporting.GetLabels(), str) {
continue
}
return createLabelNotification(c, label, bug, reporting, bugReporting)
}
return nil, nil
},
}
func createLabelNotification(c context.Context, label BugLabel, bug *Bug, reporting *Reporting,
bugReporting *BugReporting) (*dashapi.BugNotification, error) {
labelStr := label.String()
notif, err := createNotification(c, dashapi.BugNotifLabel, true, reporting.Labels[labelStr],
bug, reporting, bugReporting)
if err != nil {
return nil, err
}
notif.Label = labelStr
// For some labels also attach job results.
if label.Label == OriginLabel {
var err error
notif.TreeJobs, err = treeTestJobs(c, bug)
if err != nil {
log.Errorf(c, "failed to extract jobs for %s: %v", bug.keyHash(c), err)
return nil, fmt.Errorf("failed to fetch jobs: %w", err)
}
}
return notif, nil
}
func bugObsoletionReason(bug *Bug) dashapi.BugStatusReason {
if bug.HeadReproLevel == ReproLevelNone && bug.ReproLevel != ReproLevelNone {
return dashapi.InvalidatedByRevokedRepro
}
return dashapi.InvalidatedByNoActivity
}
var noObsoletionsKey = "Temporarily disable bug obsoletions"
func contextWithNoObsoletions(c context.Context) context.Context {
return context.WithValue(c, &noObsoletionsKey, struct{}{})
}
func getNoObsoletions(c context.Context) bool {
return c.Value(&noObsoletionsKey) != nil
}
// TODO: this is what we would like to do, but we need to figure out
// KMSAN story: we don't do fix bisection on it (rebased),
// do we want to close all old KMSAN bugs with repros?
// For now we only enable this in tests.
var obsoleteWhatWontBeFixBisected = false
func (bug *Bug) canBeObsoleted(c context.Context) bool {
if getNoObsoletions(c) {
return false
}
if bug.HeadReproLevel == ReproLevelNone {
return true
}
if obsoleteWhatWontBeFixBisected {
cfg := getNsConfig(c, bug.Namespace)
for _, mgr := range bug.HappenedOn {
if !cfg.Managers[mgr].FixBisectionDisabled {
return false
}
}
return true
}
return false
}
func (bug *Bug) obsoletePeriod(c context.Context) time.Duration {
period := never
config := getConfig(c)
if config.Obsoleting.MinPeriod == 0 {
return period
}
// Let's assume that crashes follow the Possion distribution with rate r=crashes/days.
// Then, the chance of seeing a crash within t days is p=1-e^(-r*t).
// Solving it for t, we get t=log(1/(1-p))/r.
// Since our rate is also only an estimate, let's require p=0.99.
// Before we have at least 10 crashes, any estimation of frequency is too imprecise.
// In such case we conservatively assume it still happens.
if bug.NumCrashes >= 10 {
bugDays := bug.LastTime.Sub(bug.FirstTime).Hours() / 24.0
rate := float64(bug.NumCrashes-1) / bugDays
const probability = 0.99
// For 1 crash/day, this will be ~4.6 days.
days := math.Log(1.0/(1.0-probability)) / rate
// Let's be conservative and multiply it by 3.
days = days * 3
period = time.Hour * time.Duration(24*days)
}
min, max := config.Obsoleting.MinPeriod, config.Obsoleting.MaxPeriod
if config.Obsoleting.NonFinalMinPeriod != 0 &&
bug.Reporting[len(bug.Reporting)-1].Reported.IsZero() {
min, max = config.Obsoleting.NonFinalMinPeriod, config.Obsoleting.NonFinalMaxPeriod
}
if mgr := bug.managerConfig(c); mgr != nil && mgr.ObsoletingMinPeriod != 0 {
min, max = mgr.ObsoletingMinPeriod, mgr.ObsoletingMaxPeriod
}
if period < min {
period = min
}
if period > max {
period = max
}
return period
}
func (bug *Bug) managerConfig(c context.Context) *ConfigManager {
if len(bug.HappenedOn) != 1 {
return nil
}
mgr := getNsConfig(c, bug.Namespace).Managers[bug.HappenedOn[0]]
return &mgr
}
func createNotification(c context.Context, typ dashapi.BugNotif, public bool, text string, bug *Bug,
reporting *Reporting, bugReporting *BugReporting) (*dashapi.BugNotification, error) {
reportingConfig, err := json.Marshal(reporting.Config)
if err != nil {
return nil, err
}
crash, _, err := findCrashForBug(c, bug)
if err != nil {
return nil, err
}
build, err := loadBuild(c, bug.Namespace, crash.BuildID)
if err != nil {
return nil, err
}
kernelRepo := kernelRepoInfo(c, build)
notif := &dashapi.BugNotification{
Type: typ,
Namespace: bug.Namespace,
Config: reportingConfig,
ID: bugReporting.ID,
ExtID: bugReporting.ExtID,
Title: bug.displayTitle(),
Text: text,
Public: public,
Link: fmt.Sprintf("%v/bug?extid=%v", appURL(c), bugReporting.ID),
CC: kernelRepo.CC.Always,
}
if public {
notif.Maintainers = append(crash.Maintainers, kernelRepo.CC.Maintainers...)
}
if (public || reporting.moderation) && bugReporting.CC != "" {
notif.CC = append(notif.CC, strings.Split(bugReporting.CC, "|")...)
}
if mgr := bug.managerConfig(c); mgr != nil {
notif.CC = append(notif.CC, mgr.CC.Always...)
if public {
notif.Maintainers = append(notif.Maintainers, mgr.CC.Maintainers...)
}
}
return notif, nil
}
func currentReporting(c context.Context, bug *Bug) (*Reporting, *BugReporting, int, string, error) {
if bug.NumCrashes == 0 {
// This is possible during the short window when we already created a bug,
// but did not attach the first crash to it yet. We need to avoid reporting this bug yet
// and wait for the crash. Otherwise reporting filter may mis-classify it as e.g.
// not having a report or something else.
return nil, nil, 0, "no crashes yet", nil
}
for i := range bug.Reporting {
bugReporting := &bug.Reporting[i]
if !bugReporting.Closed.IsZero() {
continue
}
reporting := getNsConfig(c, bug.Namespace).ReportingByName(bugReporting.Name)
if reporting == nil {
return nil, nil, 0, "", fmt.Errorf("%v: missing in config", bugReporting.Name)
}
if reporting.DailyLimit == 0 {
return nil, nil, 0, fmt.Sprintf("%v: reporting has daily limit 0", reporting.DisplayTitle), nil
}
switch reporting.Filter(bug) {
case FilterSkip:
if bugReporting.Reported.IsZero() {
continue
}
fallthrough
case FilterReport:
return reporting, bugReporting, i, "", nil
case FilterHold:
return nil, nil, 0, fmt.Sprintf("%v: reporting suspended", reporting.DisplayTitle), nil
}
}
return nil, nil, 0, "", fmt.Errorf("no reporting left")
}
func reproStr(level dashapi.ReproLevel) string {
switch level {
case ReproLevelSyz:
return " syz repro"
case ReproLevelC:
return " C repro"
default:
return ""
}
}
// nolint: gocyclo
func createBugReport(c context.Context, bug *Bug, crash *Crash, crashKey *db.Key,
bugReporting *BugReporting, reporting *Reporting) (*dashapi.BugReport, error) {
var job *Job
if bug.BisectCause == BisectYes || bug.BisectCause == BisectInconclusive || bug.BisectCause == BisectHorizont {
// If we have bisection results, report the crash/repro used for bisection.
causeBisect, err := queryBestBisection(c, bug, JobBisectCause)
if err != nil {
return nil, err
}
if causeBisect != nil {
err := causeBisect.loadCrash(c)
if err != nil {
return nil, err
}
}
// If we didn't check whether the bisect is unreliable, even though it would not be
// reported anyway, we could still eventually Cc people from those commits later
// (e.g. when we did bisected with a syz repro and then notified about a C repro).
if causeBisect != nil && !causeBisect.job.isUnreliableBisect() {
job = causeBisect.job
if causeBisect.crash.ReproC != 0 || crash.ReproC == 0 {
// Don't override the crash in this case,
// otherwise we will always think that we haven't reported the C repro.
crash, crashKey = causeBisect.crash, causeBisect.crashKey
}
}
}
rep, err := crashBugReport(c, bug, crash, crashKey, bugReporting, reporting)
if err != nil {
return nil, err
}
if job != nil {
cause, emails := bisectFromJob(c, job)
rep.BisectCause = cause
rep.Maintainers = append(rep.Maintainers, emails...)
}
return rep, nil
}
// crashBugReport fills in crash and build related fields into *dashapi.BugReport.
func crashBugReport(c context.Context, bug *Bug, crash *Crash, crashKey *db.Key,
bugReporting *BugReporting, reporting *Reporting) (*dashapi.BugReport, error) {
reportingConfig, err := json.Marshal(reporting.Config)
if err != nil {
return nil, err
}
crashLog, _, err := getText(c, textCrashLog, crash.Log)
if err != nil {
return nil, err
}
report, _, err := getText(c, textCrashReport, crash.Report)
if err != nil {
return nil, err
}
if len(report) > maxMailReportLen {
report = report[:maxMailReportLen]
}
machineInfo, _, err := getText(c, textMachineInfo, crash.MachineInfo)
if err != nil {
return nil, err
}
build, err := loadBuild(c, bug.Namespace, crash.BuildID)
if err != nil {
return nil, err
}
typ := dashapi.ReportNew
if !bugReporting.Reported.IsZero() {
typ = dashapi.ReportRepro
}
assetList := createAssetList(build, crash, true)
kernelRepo := kernelRepoInfo(c, build)
rep := &dashapi.BugReport{
Type: typ,
Config: reportingConfig,
ExtID: bugReporting.ExtID,
First: bugReporting.Reported.IsZero(),
Moderation: reporting.moderation,
Log: crashLog,
LogLink: externalLink(c, textCrashLog, crash.Log),
LogHasStrace: dashapi.CrashFlags(crash.Flags)&dashapi.CrashUnderStrace > 0,
Report: report,
ReportLink: externalLink(c, textCrashReport, crash.Report),
CC: kernelRepo.CC.Always,
Maintainers: append(crash.Maintainers, kernelRepo.CC.Maintainers...),
ReproOpts: crash.ReproOpts,
MachineInfo: machineInfo,
MachineInfoLink: externalLink(c, textMachineInfo, crash.MachineInfo),
CrashID: crashKey.IntID(),
CrashTime: crash.Time,
NumCrashes: bug.NumCrashes,
HappenedOn: managersToRepos(c, bug.Namespace, bug.HappenedOn),
Manager: crash.Manager,
Assets: assetList,
ReportElements: &dashapi.ReportElements{GuiltyFiles: crash.ReportElements.GuiltyFiles},
}
if !crash.ReproIsRevoked {
rep.ReproCLink = externalLink(c, textReproC, crash.ReproC)
rep.ReproC, _, err = getText(c, textReproC, crash.ReproC)
if err != nil {
return nil, err
}
rep.ReproSyzLink = externalLink(c, textReproSyz, crash.ReproSyz)
rep.ReproSyz, err = loadReproSyz(c, crash)
if err != nil {
return nil, err
}
}
if bugReporting.CC != "" {
rep.CC = append(rep.CC, strings.Split(bugReporting.CC, "|")...)
}
if build.Type == BuildFailed {
rep.Maintainers = append(rep.Maintainers, kernelRepo.CC.BuildMaintainers...)
}
if mgr := bug.managerConfig(c); mgr != nil {
rep.CC = append(rep.CC, mgr.CC.Always...)
rep.Maintainers = append(rep.Maintainers, mgr.CC.Maintainers...)
if build.Type == BuildFailed {
rep.Maintainers = append(rep.Maintainers, mgr.CC.BuildMaintainers...)
}
}
for _, label := range bug.Labels {
text, ok := reporting.Labels[label.String()]
if !ok {
continue
}
if rep.LabelMessages == nil {
rep.LabelMessages = map[string]string{}
}
rep.LabelMessages[label.String()] = text
}
if err := fillBugReport(c, rep, bug, bugReporting, build); err != nil {
return nil, err
}
return rep, nil
}
func loadReproSyz(c context.Context, crash *Crash) ([]byte, error) {
reproSyz, _, err := getText(c, textReproSyz, crash.ReproSyz)
if err != nil || len(reproSyz) == 0 {
return nil, err
}
buf := new(bytes.Buffer)
buf.WriteString(syzReproPrefix)
if len(crash.ReproOpts) != 0 {
fmt.Fprintf(buf, "#%s\n", crash.ReproOpts)
}
buf.Write(reproSyz)
return buf.Bytes(), nil
}
// fillBugReport fills common report fields for bug and job reports.
func fillBugReport(c context.Context, rep *dashapi.BugReport, bug *Bug, bugReporting *BugReporting,
build *Build) error {
kernelConfig, _, err := getText(c, textKernelConfig, build.KernelConfig)
if err != nil {
return err
}
creditEmail, err := email.AddAddrContext(ownEmail(c), bugReporting.ID)
if err != nil {
return err
}
rep.BugStatus, err = bug.dashapiStatus()
if err != nil {
return err
}
rep.Namespace = bug.Namespace
rep.ID = bugReporting.ID
rep.Title = bug.displayTitle()
rep.Link = fmt.Sprintf("%v/bug?extid=%v", appURL(c), bugReporting.ID)
rep.CreditEmail = creditEmail
rep.OS = build.OS
rep.Arch = build.Arch
rep.VMArch = build.VMArch
rep.UserSpaceArch = kernelArch(build.Arch)
rep.BuildID = build.ID
rep.BuildTime = build.Time
rep.CompilerID = build.CompilerID
rep.KernelRepo = build.KernelRepo
rep.KernelRepoAlias = kernelRepoInfo(c, build).Alias
rep.KernelBranch = build.KernelBranch
rep.KernelCommit = build.KernelCommit
rep.KernelCommitTitle = build.KernelCommitTitle
rep.KernelCommitDate = build.KernelCommitDate
rep.KernelConfig = kernelConfig
rep.KernelConfigLink = externalLink(c, textKernelConfig, build.KernelConfig)
rep.SyzkallerCommit = build.SyzkallerCommit
rep.NoRepro = build.Type == BuildFailed
for _, item := range bug.LabelValues(SubsystemLabel) {
rep.Subsystems = append(rep.Subsystems, dashapi.BugSubsystem{
Name: item.Value,
SetBy: item.SetBy,
Link: fmt.Sprintf("%v/%s/s/%s", appURL(c), bug.Namespace, item.Value),
})
rep.Maintainers = email.MergeEmailLists(rep.Maintainers,
subsystemMaintainers(c, rep.Namespace, item.Value))
}
for _, addr := range bug.UNCC {
rep.CC = email.RemoveFromEmailList(rep.CC, addr)
rep.Maintainers = email.RemoveFromEmailList(rep.Maintainers, addr)
}
return nil
}
func managersToRepos(c context.Context, ns string, managers []string) []string {
var repos []string
dedup := make(map[string]bool)
for _, manager := range managers {
build, err := lastManagerBuild(c, ns, manager)
if err != nil {
log.Errorf(c, "failed to get manager %q build: %v", manager, err)
continue
}
repo := kernelRepoInfo(c, build).Alias
if dedup[repo] {
continue
}
dedup[repo] = true
repos = append(repos, repo)
}
sort.Strings(repos)
return repos
}
func queryCrashesForBug(c context.Context, bugKey *db.Key, limit int) (
[]*Crash, []*db.Key, error) {
var crashes []*Crash
keys, err := db.NewQuery("Crash").
Ancestor(bugKey).
Order("-ReportLen").
Order("-Time").
Limit(limit).
GetAll(c, &crashes)
if err != nil {
return nil, nil, fmt.Errorf("failed to fetch crashes: %w", err)
}
return crashes, keys, nil
}
func loadAllBugs(c context.Context, filter func(*db.Query) *db.Query) ([]*Bug, []*db.Key, error) {
var bugs []*Bug
var keys []*db.Key
err := foreachBug(c, filter, func(bug *Bug, key *db.Key) error {
bugs = append(bugs, bug)
keys = append(keys, key)
return nil
})
if err != nil {
return nil, nil, err
}
return bugs, keys, nil
}
func loadNamespaceBugs(c context.Context, ns string) ([]*Bug, []*db.Key, error) {
return loadAllBugs(c, func(query *db.Query) *db.Query {
return query.Filter("Namespace=", ns)
})
}
func loadOpenBugs(c context.Context) ([]*Bug, []*db.Key, error) {
return loadAllBugs(c, func(query *db.Query) *db.Query {
return query.Filter("Status<", BugStatusFixed)
})
}
func foreachBug(c context.Context, filter func(*db.Query) *db.Query, fn func(bug *Bug, key *db.Key) error) error {
const batchSize = 2000
var cursor *db.Cursor
for {
query := db.NewQuery("Bug").Limit(batchSize)
if filter != nil {
query = filter(query)
}
if cursor != nil {
query = query.Start(*cursor)
}
iter := query.Run(c)
for i := 0; ; i++ {
bug := new(Bug)
key, err := iter.Next(bug)
if err == db.Done {
if i < batchSize {
return nil
}
break
}
if err != nil {
return fmt.Errorf("failed to fetch bugs: %w", err)
}
if err := fn(bug, key); err != nil {
return err
}
}
cur, err := iter.Cursor()
if err != nil {
return fmt.Errorf("cursor failed while fetching bugs: %w", err)
}
cursor = &cur
}
}
func filterBugs(bugs []*Bug, keys []*db.Key, filter func(*Bug) bool) ([]*Bug, []*db.Key) {
var retBugs []*Bug
var retKeys []*db.Key
for i, bug := range bugs {
if filter(bug) {
retBugs = append(retBugs, bugs[i])
retKeys = append(retKeys, keys[i])
}
}
return retBugs, retKeys
}
// reportingPollClosed is called by backends to get list of closed bugs.
func reportingPollClosed(c context.Context, ids []string) ([]string, error) {
idMap := make(map[string]bool, len(ids))
for _, id := range ids {
idMap[id] = true
}
var closed []string
err := foreachBug(c, nil, func(bug *Bug, _ *db.Key) error {
for i := range bug.Reporting {
bugReporting := &bug.Reporting[i]
if !idMap[bugReporting.ID] {
continue
}
var err error
bug, err = canonicalBug(c, bug)
if err != nil {
log.Errorf(c, "%v", err)
break
}
if bug.Status >= BugStatusFixed || !bugReporting.Closed.IsZero() ||
getNsConfig(c, bug.Namespace).Decommissioned {
closed = append(closed, bugReporting.ID)
}
break
}
return nil
})
return closed, err
}
// incomingCommand is entry point to bug status updates.
func incomingCommand(c context.Context, cmd *dashapi.BugUpdate) (bool, string, error) {
log.Infof(c, "got command: %+v", cmd)
ok, reason, err := incomingCommandImpl(c, cmd)
if err != nil {
log.Errorf(c, "%v (%v)", reason, err)
} else if !ok && reason != "" {
log.Errorf(c, "invalid update: %v", reason)
}
return ok, reason, err
}
func incomingCommandImpl(c context.Context, cmd *dashapi.BugUpdate) (bool, string, error) {
for i, com := range cmd.FixCommits {
if len(com) >= 2 && com[0] == '"' && com[len(com)-1] == '"' {
com = com[1 : len(com)-1]
cmd.FixCommits[i] = com
}
if len(com) < 3 {
return false, fmt.Sprintf("bad commit title: %q", com), nil
}
}
bug, bugKey, err := findBugByReportingID(c, cmd.ID)
if err != nil {
return false, internalError, err
}
var dupKey *db.Key
if cmd.Status == dashapi.BugStatusDup {
if looksLikeReportingHash(cmd.DupOf) {
_, dupKey, _ = findBugByReportingID(c, cmd.DupOf)
}
if dupKey == nil {
// Email reporting passes bug title in cmd.DupOf, try to find bug by title.
var dup *Bug
dup, dupKey, err = findDupByTitle(c, bug.Namespace, cmd.DupOf)
if err != nil || dup == nil {
return false, "can't find the dup bug", err
}
dupReporting := lastReportedReporting(dup)
if dupReporting == nil {
return false, "can't find the dup bug", fmt.Errorf("dup does not have reporting")
}
cmd.DupOf = dupReporting.ID
}
}
now := timeNow(c)
ok, reply := false, ""
tx := func(c context.Context) error {
var err error
ok, reply, err = incomingCommandTx(c, now, cmd, bugKey, dupKey)
return err
}
err = db.RunInTransaction(c, tx, &db.TransactionOptions{
XG: true,
// Default is 3 which fails sometimes.
// We don't want incoming bug updates to fail,
// because for e.g. email we won't have an external retry.
Attempts: 30,
})
if err != nil {
return false, internalError, err
}
return ok, reply, nil
}
func checkDupBug(c context.Context, cmd *dashapi.BugUpdate, bug *Bug, bugKey, dupKey *db.Key) (
*Bug, bool, string, error) {
dup := new(Bug)
if err := db.Get(c, dupKey, dup); err != nil {
return nil, false, internalError, fmt.Errorf("can't find the dup by key: %w", err)
}
bugReporting, _ := bugReportingByID(bug, cmd.ID)
dupReporting, _ := bugReportingByID(dup, cmd.DupOf)
if bugReporting == nil || dupReporting == nil {
return nil, false, internalError, fmt.Errorf("can't find bug reporting")
}
if bugKey.StringID() == dupKey.StringID() {
if bugReporting.Name == dupReporting.Name {
return nil, false, "Can't dup bug to itself.", nil
}
return nil, false, fmt.Sprintf("Can't dup bug to itself in different reporting (%v->%v).\n"+
"Please dup syzbot bugs only onto syzbot bugs for the same kernel/reporting.",
bugReporting.Name, dupReporting.Name), nil
}
if bug.Namespace != dup.Namespace {
return nil, false, fmt.Sprintf("Duplicate bug corresponds to a different kernel (%v->%v).\n"+
"Please dup syzbot bugs only onto syzbot bugs for the same kernel.",
bug.Namespace, dup.Namespace), nil
}
if !allowCrossReportingDup(c, bug, dup, bugReporting, dupReporting) {
return nil, false, fmt.Sprintf("Can't dup bug to a bug in different reporting (%v->%v)."+
"Please dup syzbot bugs only onto syzbot bugs for the same kernel/reporting.",
bugReporting.Name, dupReporting.Name), nil
}
dupCanon, err := canonicalBug(c, dup)
if err != nil {
return nil, false, internalError, fmt.Errorf("failed to get canonical bug for dup: %w", err)
}
if !dupReporting.Closed.IsZero() && dupCanon.Status == BugStatusOpen {
return nil, false, "Dup bug is already upstreamed.", nil
}
if dupCanon.keyHash(c) == bugKey.StringID() {
return nil, false, "Setting this dup would lead to a bug cycle, cycles are not allowed.", nil
}
return dup, true, "", nil
}
func allowCrossReportingDup(c context.Context, bug, dup *Bug,
bugReporting, dupReporting *BugReporting) bool {
bugIdx := getReportingIdx(c, bug, bugReporting)
dupIdx := getReportingIdx(c, dup, dupReporting)
if bugIdx < 0 || dupIdx < 0 {
return false
}
if bugIdx == dupIdx {
return true
}
// We generally allow duping only within the same reporting.
// But there is one exception: we also allow duping from last but one
// reporting to the last one (which is stable, final destination)
// provided that these two reportings have the same access level and type.
// The rest of the combinations can lead to surprising states and
// information hiding, so we don't allow them.
cfg := getNsConfig(c, bug.Namespace)
bugConfig := &cfg.Reporting[bugIdx]
dupConfig := &cfg.Reporting[dupIdx]
lastIdx := len(cfg.Reporting) - 1
return bugIdx == lastIdx-1 && dupIdx == lastIdx &&
bugConfig.AccessLevel == dupConfig.AccessLevel &&
bugConfig.Config.Type() == dupConfig.Config.Type()
}
func getReportingIdx(c context.Context, bug *Bug, bugReporting *BugReporting) int {
for i := range bug.Reporting {
if bug.Reporting[i].Name == bugReporting.Name {
return i
}
}
log.Errorf(c, "failed to find bug reporting by name: %q/%q", bug.Title, bugReporting.Name)
return -1
}
func incomingCommandTx(c context.Context, now time.Time, cmd *dashapi.BugUpdate, bugKey, dupKey *db.Key) (
bool, string, error) {
bug := new(Bug)
if err := db.Get(c, bugKey, bug); err != nil {
return false, internalError, fmt.Errorf("can't find the corresponding bug: %w", err)
}
var dup *Bug
if cmd.Status == dashapi.BugStatusDup {
dup1, ok, reason, err := checkDupBug(c, cmd, bug, bugKey, dupKey)
if !ok || err != nil {
return ok, reason, err
}
dup = dup1
}
state, err := loadReportingState(c)
if err != nil {
return false, internalError, err
}
ok, reason, err := incomingCommandUpdate(c, now, cmd, bugKey, bug, dup, state)
if !ok || err != nil {
return ok, reason, err
}
if _, err := db.Put(c, bugKey, bug); err != nil {
return false, internalError, fmt.Errorf("failed to put bug: %w", err)
}
if err := saveReportingState(c, state); err != nil {
return false, internalError, err
}
return true, "", nil
}
func incomingCommandUpdate(c context.Context, now time.Time, cmd *dashapi.BugUpdate, bugKey *db.Key,
bug, dup *Bug, state *ReportingState) (bool, string, error) {
bugReporting, final := bugReportingByID(bug, cmd.ID)