Bug Hunt

Wordcamp Rome 2018

Vestendo i panni di entomologi/programmatori esploreremo l’insidioso e viscido mondo dei “bug”.

Scopriremo che possono essere classificati in una tassonomia e come questa ci possa aiutare a costruire delle strategie per catturarli e “schiacciarli”.

Non è magia ma un modo per guidare l’istinto del programmatore in un processo logico di debugging.

Transcript

1. Bug Hunt @mukkoo
2. @mukkoo
3. dev.welaika.com @mukkoo
4. @mukkoo
5. debugging instinct @mukkoo
6. @mukkoo
7. @mukkoo I know how to fix it!
8. @mukkoo
9. debugging instinct @mukkoo debugging tools/xp
10. recap no super heroes, no unicorns @mukkoo no instinct debugging tools and experience
11. debugging patterns @mukkoo
12. @mukkoo Containment, sometimes, takes priority over fix
13. @mukkoo we work only with facts
14. @mukkoo observable attributes
15. @mukkoo isolation and reproduction
16. @mukkoo fix it!
17. recap observe @mukkoo choose tools and strategy fix it
18. bugs taxonomy @mukkoo
19. @mukkoo observable attributes i can reproduce it locally it seems to affect only one area #1
20. @mukkoo bohrbug deterministic, highly
 reproducible #1
21. @mukkoo bohrbug lives in the code
 LIKES hide them IN complex FUNCTIONS, CLASSES OR CONFIGURATIONS #1
22. @mukkoo tools #1 factories fixtures local tests
23. @mukkoo reproduction & resolution #1 replicate bug conditions locally test it write simplest solution refactoring for more readability
24. @mukkoo bohrbug #1 FIxed
25. @mukkoo observable attributes something that has always worked seems to have never worked #2
26. @mukkoo schrödinbug looks like leaf #2
27. @mukkoo schrödinbug pretend to be working code on close inspection reveal itself like a bug #2
28. @mukkoo schrödinbug two types: - had never worked - works in a different way you think #2
29. @mukkoo tools #2 LOGS to verify BISECT
30. @mukkoo reproduction & resolution #2 REPRODUCE bugGED STATE locally AND IN TESTS ADD LOGS FIND When it was introduced WRITE TESTS AND FIX IT
31. @mukkoo schrödinbug #2 FIxed
32. @mukkoo observable attributes APPEARS NON DETERMINISTIC seems to DISAPPEAR WHEN OBSERVED #3
33. @mukkoo heisenbug CAN YOU SEE IT? #3
34. @mukkoo heisenbug lives in the code, debugging tools modify code and execution #3
35. @mukkoo heisenbug or lives in the data and you can only see the bug on production #3
36. @mukkoo tools #3 profiling and metrics FLAMEGRAPHS
37. @mukkoo
38. @mukkoo reproduction & resolution #3 use profiling to find it use real data to reproduce recreate the state in tests follow bohrbug instructions
39. @mukkoo heisenberg #3 FIxed
40. @mukkoo observable attributes everything is broken #4
41. @mukkoo mandelbug random and
 Infinite reproduction #4
43. @mukkoo mandelbug lives in your system #4
44. @mukkoo tools #4 server tools DF -h
45. @mukkoo reproduction & resolution #4 monitoring access to server restart, rotate or kill
46. @mukkoo mandelbug #4 FIxed
47. RECAP @mukkoo
48. @mukkoo observe and classify
49. @mukkoo reproduce and isolate
50. @mukkoo test and fix it
51. @mukkoo build your own toolkit
52. Q&A thank you all @mukkoo