🐛 Bug Tracker - Production Issues

Every day 2-4pm EST, connection pool hits max (100 connections) causing new requests to fail with 503. Error: 'Connection pool timeout'. 15% of requests affected during peak. No connections being released properly. Investigation shows: long-running queries (30s+) holding connections, no query timeout configured, connection leak in transaction handling. Impact: 500+ users affected, support tickets +200%. Fix: 1) Add query timeout (10s) 2) Audit transaction commits/rollbacks 3) Increase pool size to 200 4) Add connection pool metrics 5) Implement query queueing. Also found: missing indexes causing slow queries. Requires DB migration. Hotfix: restart servers to clear connections. Permanent fix needed.

Database connection pool exhausted causing 503 errors during peak hours

Production servers running out of memory and crashing every 6 hours. Heap dump analysis shows WebSocket connections not being properly garbage collected. 2GB initial heap grows to 8GB over 6 hours then crashes with OutOfMemoryError. Affects all 6 API servers. Customer impact: users disconnected every 6 hours, losing unsaved work. Logs show 10K+ stale connections. Root cause likely: event listeners not cleaned up on disconnect, message buffers not cleared. Fix needed: 1) Add connection cleanup on disconnect 2) Implement connection timeout (30min idle) 3) Add memory monitoring alerts 4) Stress test with connection churn. Priority: P0 - production down every 6 hours. Est fix time: 1 day.

Memory leak in WebSocket server causing OOM crashes every 6 hours

Stripe webhooks failing intermittently (12% failure rate) causing payment sync issues. Users report: double charges, payment succeeded but subscription not activated, invoices showing wrong status. Webhook endpoint timing out (>30s response). Issues: 1) Synchronous processing of webhook in HTTP handler 2) Database locks during payment processing 3) No retry logic for failures 4) Webhook signature verification failing. Financial impact: $15K in refunds this month, 47 support escalations. Fix required: 1) Move webhook processing to background jobs 2) Implement idempotency keys 3) Add webhook replay mechanism 4) Fix signature verification 5) Add comprehensive logging. Priority: P0 - financial impact. Compliance risk. Requires QA signoff before deploy.

Payment webhook failures causing double charges and failed transactions

Search completely broken for queries containing special characters: @, #, &, %, quotes. Examples: searching '@john' returns 0 results despite 100+ mentions. Affects ~15% of searches based on analytics. Users think content doesn't exist. Issue: Elasticsearch tokenizer incorrectly handling special chars, treating them as delimiters. Query string not escaped properly. Fix: 1) Update Elasticsearch analyzer to preserve special chars 2) Escape query strings properly 3) Add fuzzy matching as fallback 4) Rebuild search index with new settings 5) Add search quality tests with special chars. Reindex will take 4 hours in production. Need maintenance window. Priority: P1 - major feature broken.

Search returning 0 results for queries with special characters

After last deployment, API returning CORS errors for requests from app.newdomain.com (our new primary domain). Old domain.com still works. All POST/PUT/DELETE requests failing with CORS preflight errors. GET requests work. Error: 'Access-Control-Allow-Origin header missing'. Root cause: CORS middleware not updated with new domain in allowed origins list. Affects 100% of users on new domain (20% of traffic). Quick fix deployed: added new domain to CORS whitelist. But underlying issue: hardcoded domains in config file. Permanent fix needed: 1) Move CORS config to environment variables 2) Support wildcard subdomains 3) Add CORS testing to deployment checklist 4) Document domain update procedure. Status: Hotfix deployed, monitoring for issues.

CORS errors blocking API requests from new domain after deployment

100% crash rate on iOS 17 when tapping user profile. Crashlytics reports: EXC_BAD_ACCESS in image loading code. Only affects iOS 17 (released 2 weeks ago), iOS 16 works fine. Apple changed image caching API in iOS 17 causing crash. Stack trace points to avatar loading in ProfileViewController. Affects 35% of iOS users (those who updated). Workaround: use web app. Fix options: 1) Update SDWebImage library to latest (4.x → 5.x, breaking changes) 2) Implement custom image caching 3) Rollback to URL-based loading (no cache). Submitted emergency update to App Store (2-day review). Android unaffected. Priority: P0 - app completely broken for 1/3 of iOS users.

Mobile app crashes on iOS 17 when opening user profiles

Calendar events displaying at wrong times for users in different timezones. Event created at 2pm PT shows as 10pm ET (should be 5pm ET). Daylight Saving Time transitions causing additional bugs. Affects international users and distributed teams. Reports from users in: UK, Australia, India, Brazil. Issue: 1) Server storing times in local time instead of UTC 2) Frontend not converting to user's timezone 3) DST transitions not handled 4) Timezone database outdated. Data corruption: 3000+ events stored with wrong timestamps. Fix requires: 1) Database migration to convert all times to UTC 2) Update frontend to use user's timezone preference 3) Add timezone to user profile 4) Update timezone library. Migration plan needed to avoid data loss. Estimated 2 weeks including testing.

Incorrect timezone conversion showing events at wrong times

When user updates profile from multiple tabs/devices simultaneously, last write wins causing data loss. Example: user updates email in tab 1, updates phone in tab 2, phone update overwrites email change back to old value. No optimistic locking or conflict detection. Issue: using PUT with full object instead of PATCH with specific fields. Database has no row versioning. Affects users with multiple active sessions. 23 reports of 'changes not saving'. Fix: 1) Implement optimistic locking with version field 2) Use PATCH for partial updates 3) Add conflict detection and resolution UI 4) Database migration to add version column 5) Update all edit forms. Also add: last-modified-by tracking, change history. Testing needed: concurrent edit scenarios. Priority: P2 - edge case but data loss.

Race condition in concurrent user profile updates causing data overwrites

When users submit invalid data (malformed email, missing required fields), API returns 500 Internal Server Error instead of proper 400 Bad Request with validation details. Frontend shows generic 'Something went wrong' message. Users don't know what to fix. Issue: validation errors throwing unhandled exceptions instead of returning error response. No centralized error handling middleware. Each endpoint handles errors differently (or not at all). Examples: email validation regex causes crash on null input, date parsing throws on invalid format. Fix: 1) Centralized error handling middleware 2) Proper HTTP status codes (400 for validation, 409 for conflicts, etc) 3) Structured error responses with field-level details 4) Input validation before processing 5) Update API documentation with error examples. Priority: P2 - poor UX but not blocking.

API returning 500 instead of 400 for invalid input validation errors

Dashboard has 8 widgets, if any single data source fails (slow query, service down), entire dashboard fails to load. Shows loading spinner indefinitely. All-or-nothing approach. User can't access any dashboard data. Issue: Promise.all() for parallel data fetching, one reject fails all. No error boundaries in React components. No fallback UI for failed widgets. No timeout on queries. Fix: 1) Independent widget loading (Promise.allSettled) 2) Show available widgets even if some fail 3) Add error state UI per widget with retry button 4) Implement timeouts (5s) 5) Add circuit breaker for failing services. Also: skeleton loaders for progressive loading. Priority: P2 - availability issue but workaround exists (refresh).

Dashboard widgets fail to load when one data source is down

Email queue backing up during peak hours causing 2-4 hour delays in notifications. Users missing time-sensitive alerts (password resets, security alerts, mentions). SendGrid rate limit (100 emails/sec) is not the bottleneck. Issue: single-threaded email processor, database query for each email (N+1), template rendering in sync. Queue has 50K+ pending emails during peak. Impact: 30% of emails delayed, password reset tokens expiring before email arrives. Fix: 1) Parallel workers (5 instances) 2) Batch email fetching 3) Pre-compile email templates 4) Implement priority queue (security emails first) 5) Add email sending metrics. Consider: switching to AWS SES for higher throughput. Need capacity planning analysis. Priority: P1 - security impact.

Email notifications delayed by 2+ hours during high traffic

Users report files disappearing after upload with no error. Files >10MB fail silently - progress bar completes but file doesn't appear. No error message shown. Nginx has 10MB limit (client_max_body_size), backend allows 50MB, frontend doesn't validate size. Upload appears successful but nginx returns 413 (Payload Too Large) which frontend doesn't handle. Affects ~8% of uploads. Users think upload worked then can't find file. Fix: 1) Update nginx config to 50MB 2) Add frontend file size validation before upload 3) Show proper error messages 4) Add upload verification step 5) Handle 413 status code. Also implement: chunked upload for large files, resume capability. Priority: P1 - data loss perception, user frustration.

File upload fails silently for files >10MB with no error message

Users with expired sessions stuck in redirect loop: /login → /dashboard → /login. Browser eventually shows 'Too many redirects'. Auth middleware redirecting to /dashboard after login, dashboard checks auth and redirects to /login, repeat. Affects users who were logged out automatically (session timeout). Only happens if user lands on /dashboard directly (bookmarked URL). Can't log in without clearing cookies. Issue: middleware running in wrong order, no redirect loop detection, session cookie not being cleared on timeout. Fix: 1) Proper middleware order (auth check before route) 2) Clear session cookie on timeout 3) Add redirect loop prevention (max 3 redirects) 4) Redirect to login with return_url parameter. Priority: P1 - blocks login for affected users.

Infinite redirect loop on login for users with expired sessions

Users update profile info but old data still shown for 5-10 minutes. Other users also see stale data. Issue: Redis cache with 15min TTL not being invalidated on updates. Cache invalidation only happens on expiry, not on data modification. Multiple cache keys for same user data (by ID, by email, by username) - update invalidates one but not others. Also: cache stampede on expiry causing DB load spike. Fix: 1) Invalidate all related cache keys on update 2) Implement cache tagging 3) Add cache-aside pattern with write-through 4) Reduce TTL to 5min for profile data 5) Add ETag headers for HTTP caching. Consider: pub/sub for cache invalidation across multiple servers. Test: distributed cache coherence. Priority: P2 - frustrating but not critical.

Stale cache showing outdated data after user updates profile

After using app for 1+ hour, browser becomes sluggish, CPU spikes to 100%, memory usage grows from 200MB to 2GB+. Eventually browser tab crashes. React DevTools profiler shows: unmounted components not being GC'd, event listeners accumulating, setInterval not being cleared, WebSocket callbacks not removed. Issue: useEffect hooks missing cleanup functions. Multiple timers for auto-save not being cleared. Redux subscriptions leaking. Reproduce: leave app open, navigate between pages 20+ times. Fix: 1) Add useEffect cleanup for all subscriptions/timers 2) Fix WebSocket event listener removal 3) Unsubscribe from Redux on unmount 4) Implement React.memo for expensive renders 5) Add memory profiling to CI. Priority: P2 - affects power users keeping app open all day.

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