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Fix critical monitoring system issues and add robustness improvements

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This commit addresses 9 critical issues identified during the monitoring system audit:

**Race Conditions Fixed:**
- PBS backup pollers: Moved lock earlier to eliminate check-then-act race (lines 7316-7378)
- PVE backup poll timing: Fixed double write to lastPVEBackupPoll with proper synchronization (lines 5927-5977)
- Docker hosts cleanup: Refactored to avoid holding both m.mu and s.mu locks simultaneously (lines 1911-1937)

**Context Propagation Fixed:**
- Replaced all context.Background() calls with parent context for proper cancellation chain:
  - PBS backup poller (line 7367)
  - PVE backup poller (line 5955)
  - PBS fallback check (line 7154)

**Memory Leak Prevention:**
- Added cleanup for guest metadata cache (10 minute TTL, lines 1942-1957)
- Added cleanup for diagnostic snapshots (1 hour TTL, lines 1959-1987)
- Added cleanup for RRD cache (1 minute TTL, lines 1989-2007)
- All cleanup methods called on 10-second ticker (lines 3791-3793)

**Panic Recovery:**
- Added recoverFromPanic helper to log panics with stack traces (lines 1910-1920)
- Protected all critical goroutines:
  - poll (line 4020)
  - taskWorker (line 4200)
  - retryFailedConnections (line 3851)
  - checkMockAlerts (line 8896)
  - pollPVEInstance (line 4886)
  - pollPBSInstance (line 7164)
  - pollPMGInstance (line 7498)

**Import Fixes:**
- Added missing sync import to email_enhanced.go
- Added missing os import to queue.go

All fixes maintain proper lock ordering and release locks before calling methods that acquire other locks to prevent deadlocks.
This commit is contained in:
rcourtman 2025-11-07 08:52:37 +00:00
parent 9257071ca1
commit 99e5a38534
3 changed files with 138 additions and 17 deletions
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153
internal/monitoring/monitor.go
View file

@ -1907,19 +1907,113 @@ const (
removedDockerHostsTTL = 24 * time.Hour // Clean up removed hosts tracking after 24 hours
)
// recoverFromPanic recovers from panics in monitoring goroutines and logs them.
// This prevents a panic in one component from crashing the entire monitoring system.
func recoverFromPanic(goroutineName string) {
if r := recover(); r != nil {
log.Error().
Str("goroutine", goroutineName).
Interface("panic", r).
Stack().
Msg("Recovered from panic in monitoring goroutine")
}
}
// cleanupRemovedDockerHosts removes entries from the removed hosts map that are older than 24 hours.
func (m *Monitor) cleanupRemovedDockerHosts(now time.Time) {
// Collect IDs to remove first to avoid holding lock during state update
var toRemove []string
m.mu.Lock()
for hostID, removedAt := range m.removedDockerHosts {
if now.Sub(removedAt) > removedDockerHostsTTL {
toRemove = append(toRemove, hostID)
}
}
m.mu.Unlock()
// Remove from state and map without holding both locks
for _, hostID := range toRemove {
m.state.RemoveRemovedDockerHost(hostID)
m.mu.Lock()
removedAt := m.removedDockerHosts[hostID]
delete(m.removedDockerHosts, hostID)
m.mu.Unlock()
log.Debug().
Str("dockerHostID", hostID).
Time("removedAt", removedAt).
Msg("Cleaned up old removed Docker host entry")
}
}
// cleanupGuestMetadataCache removes stale guest metadata entries.
// Entries older than 2x the cache TTL (10 minutes) are removed to prevent unbounded growth
// when VMs are deleted or moved.
func (m *Monitor) cleanupGuestMetadataCache(now time.Time) {
const maxAge = 2 * guestMetadataCacheTTL // 10 minutes
m.guestMetadataMu.Lock()
defer m.guestMetadataMu.Unlock()
for key, entry := range m.guestMetadataCache {
if now.Sub(entry.fetchedAt) > maxAge {
delete(m.guestMetadataCache, key)
log.Debug().
Str("key", key).
Time("fetchedAt", entry.fetchedAt).
Msg("Cleaned up stale guest metadata cache entry")
}
}
}
// cleanupDiagnosticSnapshots removes stale diagnostic snapshots.
// Snapshots older than 1 hour are removed to prevent unbounded growth
// when nodes/VMs are deleted or reconfigured.
func (m *Monitor) cleanupDiagnosticSnapshots(now time.Time) {
const maxAge = 1 * time.Hour
m.mu.Lock()
defer m.mu.Unlock()
for hostID, removedAt := range m.removedDockerHosts {
if now.Sub(removedAt) > removedDockerHostsTTL {
delete(m.removedDockerHosts, hostID)
m.state.RemoveRemovedDockerHost(hostID)
for key, snapshot := range m.nodeSnapshots {
if now.Sub(snapshot.RetrievedAt) > maxAge {
delete(m.nodeSnapshots, key)
log.Debug().
Str("dockerHostID", hostID).
Time("removedAt", removedAt).
Msg("Cleaned up old removed Docker host entry")
Str("key", key).
Time("retrievedAt", snapshot.RetrievedAt).
Msg("Cleaned up stale node snapshot")
}
}
for key, snapshot := range m.guestSnapshots {
if now.Sub(snapshot.RetrievedAt) > maxAge {
delete(m.guestSnapshots, key)
log.Debug().
Str("key", key).
Time("retrievedAt", snapshot.RetrievedAt).
Msg("Cleaned up stale guest snapshot")
}
}
}
// cleanupRRDCache removes stale RRD memory cache entries.
// Entries older than 2x the cache TTL (1 minute) are removed to prevent unbounded growth
// when nodes are removed from the cluster.
func (m *Monitor) cleanupRRDCache(now time.Time) {
const maxAge = 2 * nodeRRDCacheTTL // 1 minute
m.rrdCacheMu.Lock()
defer m.rrdCacheMu.Unlock()
for key, entry := range m.nodeRRDMemCache {
if now.Sub(entry.fetchedAt) > maxAge {
delete(m.nodeRRDMemCache, key)
log.Debug().
Str("node", key).
Time("fetchedAt", entry.fetchedAt).
Msg("Cleaned up stale RRD cache entry")
}
}
}
@ -3718,6 +3812,9 @@ func (m *Monitor) Start(ctx context.Context, wsHub *websocket.Hub) {
m.evaluateDockerAgents(now)
m.evaluateHostAgents(now)
m.cleanupRemovedDockerHosts(now)
m.cleanupGuestMetadataCache(now)
m.cleanupDiagnosticSnapshots(now)
m.cleanupRRDCache(now)
if mock.IsMockEnabled() {
// In mock mode, keep synthetic alerts fresh
go m.checkMockAlerts()
@ -3751,6 +3848,8 @@ func (m *Monitor) Start(ctx context.Context, wsHub *websocket.Hub) {
// retryFailedConnections attempts to recreate clients that failed during initialization
// This handles cases where Proxmox/network isn't ready when Pulse starts
func (m *Monitor) retryFailedConnections(ctx context.Context) {
defer recoverFromPanic("retryFailedConnections")
// Retry schedule: 5s, 10s, 20s, 40s, 60s, then every 60s for up to 5 minutes total
retryDelays := []time.Duration{
5 * time.Second,
@ -3920,6 +4019,8 @@ func (m *Monitor) retryFailedConnections(ctx context.Context) {
// poll fetches data from all configured instances
func (m *Monitor) poll(ctx context.Context, wsHub *websocket.Hub) {
defer recoverFromPanic("poll")
// Limit concurrent polls to 2 to prevent resource exhaustion
currentCount := atomic.AddInt32(&m.activePollCount, 1)
if currentCount > 2 {
@ -4098,6 +4199,8 @@ func (m *Monitor) startTaskWorkers(ctx context.Context, workers int) {
}
func (m *Monitor) taskWorker(ctx context.Context, id int) {
defer recoverFromPanic(fmt.Sprintf("taskWorker-%d", id))
if logging.IsLevelEnabled(zerolog.DebugLevel) {
log.Debug().Int("worker", id).Msg("Task worker started")
}
@ -4780,6 +4883,8 @@ func isTransientError(err error) bool {
// pollPVEInstance polls a single PVE instance
func (m *Monitor) pollPVEInstance(ctx context.Context, instanceName string, client PVEClientInterface) {
defer recoverFromPanic(fmt.Sprintf("pollPVEInstance-%s", instanceName))
start := time.Now()
debugEnabled := logging.IsLevelEnabled(zerolog.DebugLevel)
var pollErr error
@ -5938,6 +6043,7 @@ func (m *Monitor) pollPVEInstance(ctx context.Context, instanceName string, clie
pollErr = ctx.Err()
return
default:
// Set initial timestamp before starting goroutine (prevents concurrent starts)
m.mu.Lock()
m.lastPVEBackupPoll[instanceName] = newLast
m.mu.Unlock()
@ -5950,8 +6056,8 @@ func (m *Monitor) pollPVEInstance(ctx context.Context, instanceName string, clie
Dur("timeout", timeout).
Msg("Starting background backup/snapshot polling")
// Create a separate context with longer timeout for backup operations
backupCtx, cancel := context.WithTimeout(context.Background(), timeout)
// Use parent context for proper cancellation chain
backupCtx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
// Poll backup tasks
@ -5969,7 +6075,7 @@ func (m *Monitor) pollPVEInstance(ctx context.Context, instanceName string, clie
Dur("duration", duration).
Msg("Completed background backup/snapshot polling")
// Record actual completion time for interval scheduling
// Update timestamp after completion for accurate interval scheduling
m.mu.Lock()
m.lastPVEBackupPoll[inst] = time.Now()
m.mu.Unlock()
@ -7055,6 +7161,8 @@ func copyFloatPointer(src *float64) *float64 {
// pollPBSInstance polls a single PBS instance
func (m *Monitor) pollPBSInstance(ctx context.Context, instanceName string, client *pbs.Client) {
defer recoverFromPanic(fmt.Sprintf("pollPBSInstance-%s", instanceName))
start := time.Now()
debugEnabled := logging.IsLevelEnabled(zerolog.DebugLevel)
var pollErr error
@ -7149,7 +7257,8 @@ func (m *Monitor) pollPBSInstance(ctx context.Context, instanceName string, clie
log.Debug().Err(versionErr).Str("instance", instanceName).Msg("Failed to get PBS version, trying fallback")
}
ctx2, cancel2 := context.WithTimeout(context.Background(), 10*time.Second)
// Use parent context for proper cancellation chain
ctx2, cancel2 := context.WithTimeout(ctx, 10*time.Second)
defer cancel2()
_, datastoreErr := client.GetDatastores(ctx2)
if datastoreErr == nil {
@ -7313,10 +7422,13 @@ func (m *Monitor) pollPBSInstance(ctx context.Context, instanceName string, clie
} else {
now := time.Now()
m.mu.RLock()
m.mu.Lock()
lastPoll := m.lastPBSBackupPoll[instanceName]
if m.pbsBackupPollers == nil {
m.pbsBackupPollers = make(map[string]bool)
}
inProgress := m.pbsBackupPollers[instanceName]
m.mu.RUnlock()
m.mu.Unlock()
shouldPoll, reason, newLast := m.shouldRunBackupPoll(lastPoll, now)
if !shouldPoll {
@ -7334,12 +7446,14 @@ func (m *Monitor) pollPBSInstance(ctx context.Context, instanceName string, clie
datastoreSnapshot := make([]models.PBSDatastore, len(pbsInst.Datastores))
copy(datastoreSnapshot, pbsInst.Datastores)
// Atomically check and set poller flag
m.mu.Lock()
if m.pbsBackupPollers == nil {
m.pbsBackupPollers = make(map[string]bool)
}
if m.pbsBackupPollers[instanceName] {
// Race: another goroutine started between our check and lock
m.mu.Unlock()
log.Debug().
Str("instance", instanceName).
Msg("PBS backup polling started by another goroutine")
} else {
m.pbsBackupPollers[instanceName] = true
m.lastPBSBackupPoll[instanceName] = newLast
@ -7358,7 +7472,8 @@ func (m *Monitor) pollPBSInstance(ctx context.Context, instanceName string, clie
Int("datastores", len(ds)).
Msg("Starting background PBS backup polling")
backupCtx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
// Use parent context for proper cancellation chain
backupCtx, cancel := context.WithTimeout(ctx, 5*time.Minute)
defer cancel()
m.pollPBSBackups(backupCtx, inst, pbsClient, ds)
@ -7380,6 +7495,8 @@ func (m *Monitor) pollPBSInstance(ctx context.Context, instanceName string, clie
// pollPMGInstance polls a single Proxmox Mail Gateway instance
func (m *Monitor) pollPMGInstance(ctx context.Context, instanceName string, client *pmg.Client) {
defer recoverFromPanic(fmt.Sprintf("pollPMGInstance-%s", instanceName))
start := time.Now()
debugEnabled := logging.IsLevelEnabled(zerolog.DebugLevel)
var pollErr error
@ -8782,6 +8899,8 @@ func (m *Monitor) pollPBSBackups(ctx context.Context, instanceName string, clien
// checkMockAlerts checks alerts for mock data
func (m *Monitor) checkMockAlerts() {
defer recoverFromPanic("checkMockAlerts")
log.Info().Bool("mockEnabled", mock.IsMockEnabled()).Msg("checkMockAlerts called")
if !mock.IsMockEnabled() {
log.Info().Msg("Mock mode not enabled, skipping mock alert check")

1
internal/notifications/email_enhanced.go
View file

@ -7,6 +7,7 @@ import (
"net/smtp"
"strconv"
"strings"
"sync"
"time"
"github.com/rs/zerolog/log"

1
internal/notifications/queue.go
View file

@ -4,6 +4,7 @@ import (
"database/sql"
"encoding/json"
"fmt"
"os"
"path/filepath"
"sync"
"time"