PHPのマニュアルにないことをしてphp-srcへバグ報告をした

マニュアルにないことをするとどうなるのか、どうなったのか、
そしてSegfaultが発生してバグを報告したという内容を共有します。

Transcript

1. 1)1ͷόάΛݟ͚ͭͨ
   ϚχϡΞϧʹͳ͍Ҿ਺ೖΕΔͱͲ͏ͳΔͰ͠ΐ͏
   

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2. ࣗݾ঺հ
   w͖ͯΊΜ
   w IUUQTUFLJUPINFNEIPJJOGP

   Α͘͜͜Ͱௐ΂෺ॻ͍ͯΔ
   w IUUQTUXJUUFSDPNZPVLJEFBSJUBJ
   

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3. ཁ໿
   w 1)1ͷϏϧτΠϯؔ਺ͷҾ਺Λؒҧ͑Δ
   w NCTUSJOHؔ਺ͷ1)1ͱʙɺҎ߱ͷҧ͍
   w QIQTSD NCTUSJOH
   ͷόάΛใࠂͨ͠
   ใࠂΛͨ͜͠ͱ͕ΩϞͰ͸͋Δ͚Ͳɺ
   ͦΕΛઆ໌͢Δͷʹ্ͭͷઆ໌͕ඞཁͩͬͨ
   

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4. Ҿ਺ͷσʔλܕΛؒҧ͑Δͱ
   /6--͕ฦΔ
   w IUUQTXXXQIQOFUNBOVBMKB
   GVODUJPOTJOUFSOBMQIQ
   w ͭ·Γɺ/6--ͷ͜ͱ͕ଟ͍͚Ͳɺ/6--Ͱͳ͍͔΋͠Ε
   ͳ͍
   

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5. ྫTUSMFO
   Ҿ਺ʹTUSJOHΛཁٻ͞Ε͍ͯΔ
   ฦΓ஋͸JOU͕ฦͬͯ͘Δ
   

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6. ྫNC@TUSMFO
   Ҿ਺ʹTUSJOHΛཁٻ͞Ε͍ͯΔ
   ฦΓ஋͸JOU͕ฦͬͯ͘Δ
   FODPEJOH͕͓͔͍͠ͱ'"-4&
   

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7. ྫTUSMFOͱNC@TUSMFO
   ͭͷؔ਺ʹɺීஈೖΕͳ͍Α͏ͳ஋΋
   Ҿ਺ʹͱͬͯΈΔ
   

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8. ྫTUSMFOͱNC@TUSMFO
   1)1·Ͱ͸BSSBZ΍PCKFDUͳͲΛҾ਺ʹऔΔͱ
   TUSMFO͸/6--ʹͳΔ͕ɺNC@TUSMFO͸GBMTFʹͳΔ
   

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9. ༨ஊͰ͕͢
   ݹ͍1)1 ʙ
   Ͱ͸
   TUSMFO BSSBZ
   
   ΍TUSMFO OFXTUE$MBTT
   
   
   ͰJOU͕ฦΔ
   l"SSBZz΍l0CKFDUzͱ͍͏จࣈྻʹม׵͞ΕͯҾ਺ͱͳΔ
   ˠTUSMFO l"SSBZz
   TUSMFO l0CKFDUz
   ͱಉ͡
   

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10. ͜͜·Ͱͷ·ͱΊ
    w ϚχϡΞϧʹͳ͍ࣄ͢ΔͱɺະఆٛͷڍಈʹͳΔ
    w TUSJOH͕ཁٻ͞ΕͯΔͱ͜ΖʹBSSBZೖΕͨΓ͢Δͱ/6--
    ͕ฦͬͯ͘Δɻؔ਺ͷϚχϡΞϧʹͳͯ͘΋/6--
    w NCTUSJOHؔ਺͸1)1·ͰGBMTFΛͣͬͱฦͯͨ͠
    

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11. ཁ໿
    w 1)1ͷϏϧτΠϯؔ਺ͷҾ਺Λؒҧ͑Δ
    w NCTUSJOHؔ਺ͷ1)1ͱʙɺҎ߱ͷҧ͍
    w QIQTSD NCTUSJOH
    ͷόάΛใࠂͨ͠
    

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12. ྫTUSMFOͱNC@TUSMFO
    1)1·Ͱ͸BSSBZ΍PCKFDUͳͲΛҾ਺ʹऔΔͱ
    TUSMFO͸/6--ʹͳΔ͕ɺNC@TUSMFO͸GBMTFʹͳΔ
    1)1Ҏ߱͸Ͳ͏ͳͬͨͷ
    

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13. ྫTUSMFOͱNC@TUSMFO
    1)1͔Β͸/6--ʹͳΓ·ͨ͠ɻ
    

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14. NCTUSJOHͷ໭Γ஋͕/6--
    w IUUQTHJUIVCDPNQIQQIQTSDDPNNJU
    DCGBGCDECDECBFE
    Ͱೖͬͨ
    w NCTUSJOHؔ਺ͷGBMTF͕/6--ʹվΊΒΕͨ
    

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15. NCTUSJOHͷ໭Γ஋͕/6--
    w IUUQTHJUIVCDPNQIQQIQTSDDPNNJU
    DCGBGCDECDECBFE
    Ͱೖͬͨ
    w NCTUSJOHؔ਺ͷGBMTF͕/6--ʹվΊΒΕͨ
    NCTUSJOHશ෦ͦ͏ͳͷ͔ͳʁ
    

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16. ௐ΂ͯΈΑ͏
    ͦ͏ࢥͬͨͷ͕೥݄Ͱͨ͠
    1)13$͕࠷৽ͩͬͨ
    
    

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17. શ෦/6--ͳͷ͔ௐ΂Δ
    ͜ͷϓϩάϥϜΛಈ͔͢ͱͦΕͧΕ/6--ͷ͸ͣ
    

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18. શ෦/6--ͳͷ͔ௐ΂Δ
    ͓͜ͱΘΓɿ1)13$͸WMPSHͰ
    ࢖͑ͳ͘ͳͬͯͨͷͰɺଞͷόάͰ࠶ݱͯ͠·͢ɻ
    ʮଞͷόάʯIUUQTCVHTQIQOFUCVHQIQ JE Ͱमਖ਼͞Εͨ
    
    1SPDFTTFYJUFEXJUIDPEF
    
    

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19. ίϯύΠϧ͢Δ
    w 1)13$ͷιʔεΛμ΢ϯϩʔυ͢Δ͔HJUϦϙδ
    τϦ͋Ε͹͔ͦ͜ΒDIFDLPVUͯ͠औͬͯ͘Δ
    w IUUQTHJUIVCDPNQIQQIQTSDSFMFBTFTUBH
    QIQ3$
    w ࢲ͕࠶ݱͨ͠ͱ͖ͷίϯύΠϧΦϓγϣϯ
    DPOpHVSFŠFOBCMFNCTUSJOHŠFOBCMFEFCVHŠEJTBCMFBMM
    

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20. Μʁ
    

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22. 1SPDFTTFYJUFEXJUIDPEF
    ͱ͸
    For the shell's purposes, a command which exits with a zero exit status has
    succeeded. An exit status of zero indicates success. A non-zero exit status
    indicates failure. When a command terminates on a fatal signal N, bash uses the
    value of 128+N as the exit status.
    NBOCBTIΑΓ
    ਖ਼ৗʹऴྃ͠ͳ͔ͬͨͱ͖ɺCBTI͸/Λग़͢
    /͸ͱͳΔ
    

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23. 1SPDFTTFYJUFEXJUIDPEF
    ͱ͸
    SIGKILL 9 Term Kill signal
    SIGSEGV 11 Core Invalid memory reference
    SIGPIPE 13 Term Broken pipe: write to pipe with no
    readers
    NBOTJHOBMΑΓ
    ͱ͍͏ͷ͸4*(4&(7ɺͭ·Γ4FHNFOUBUJPO'BVMU
    

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24. 4FHNFOUBUJPO'BVMU
    NC@DPOWFSU@LBOB·Ͱ͸ಈ͍ͨ
    

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25. όάΛݟ͚ͭΔ
    w NC@DPOWFSU@LBOB·Ͱಈ͍ͯͨ
    w ࣍ͷNC@DIFDL@FODPEJOH͔ͳʁ
    

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26. όάΛݟ͚ͭͨ
    όάʹͳΔ࠷খͷίʔυΛൃݟͨ͠
    

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27. ·ͣམͪண͍ͯ֬ೝ͢Δ
    w 1)13$ͰNC@DIFDL@FODPEJOHͰBSSBZ
    ΛೖΕ
    ͨΒ4FHNFOUBUJPOGBVMU
    w ଞͷόʔδϣϯͰ͸࠶ݱ͠ͳ͍͜ͱ͸WMͰ֬ೝࡁΈ
    w BSSBZ
    ͸ۭͷBSSBZ͕ͩɺۭͰ͸ͳ͍BSSBZΛ֬ೝͯ͠
    ͳ͍
    

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28. ཁ໿
    w 1)1ͷϏϧτΠϯؔ਺ͷҾ਺Λؒҧ͑Δ
    w NCTUSJOHؔ਺ͷ1)1ͱʙɺҎ߱ͷҧ͍
    w ใࠂͨ͠
    

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29. ใࠂΛ͠Α͏
    ͋ͳ͕ͨͦͷόάΛใࠂ͠ͳ͍ݶΓɺ
    1)1ͷ։ൃऀ͕ͦͷόάΛ஌Δ͜ͱ͸ڪΒ͘ͳ͍
    όάใࠂͷ࢓ํΛಡ΋͏
    

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30. ใࠂΛ͠Α͏
    ͋ͳ͕ͨͦͷόάΛใࠂ͠ͳ͍ݶΓɺ
    1)1ͷ։ൃऀ͕ͦͷόάΛ஌Δ͜ͱ͸ڪΒ͘ͳ͍
    όάใࠂͷ࢓ํΛಡ΋͏
    

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31. w 5IFCBTJDTXIBUZPVEJE XIBUZPVXBOUFEUPIBQQFO BOEXIBUBDUVBMMZIBQQFOFE

    جຊ͋ͳ͕ͨԿΛͯ͠ɺԿΛ๬ΜͰͯɺͦ͏ͳͬͨͷ͔
    w "MXBZTTFBSDIBCVHEBUBCBTFpSTU

    ࠷ॳʹόάͷσʔλϕʔε୳͍ͯͩ͘͠͞
    w *GZPVVOEFSTUBOEFSSPSNFTTBHF BTLGPSIFMQ

    ΤϥʔϝοηʔδΛཧղͰ͖ͳ͍ͳΒɺॿ͚ΛݺΜͰ͍ͩ͘͞ʢ͜͜Ͱ͸ͳ͍ʣ
    w #FCSJFG CVUEPO`UMFBWFBOZJNQPSUBOUEFUBJMTPVU

    ୹͘؆ܿʹɺ͔͠͠ॏཁͳ͜ͱ͸ൈ͔͞ͳ͍Ͱ͍ͩ͘͞
    w 6TF&OHMJTI
    w %PO`USFQPSUCVHTBCPVUPMEWFSTJPOT

    ݹ͍όʔδϣϯͷόάΛใࠂ͠ͳ͍Ͱ͍ͩ͘͞
    w 0OMZSFQPSUPOFQSPCMFNJOFBDICVHSFQPSU

    ҰͭͷόάʹҰͭͷใࠂΛॻ͍͍ͯͩ͘͞
    

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32. ӳޠ͸Ͱ͖Δ΂͖͕ͩ
    w .Z&OHMJTIJTQPPS
    w 1)1ͷCVHΛใࠂ͢Δ৔ɻӳޠͷΫΦϦςΟΑΓɺ1)1
    ͷίʔυΛࣔͯ͠ɺ&YQFDUFE"DUVBMΛࣔͤ͹͖ͬͱΘ
    ͔ͬͯ͘ΕΔʢ͸ͣʣ
    w ใࠂ͢Δ͜ͱ͕େࣄɺߩݙ͢Δͱ͍͏ؾ͕࣋ͪେࣄ
    w ؾΛ࢖ΘͤΔ͚ͩͰ͸ਃ͠༁ͳ͍ͷͰɺӳޠΛษڧ͠ͳ͍
    ͱ͍͚ͳ͍ͳͱ͸ࢥ͏ɻ
    

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33. όάΛใࠂ͢ΔϖʔδCVHTQIQOFU
    

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34. ӈ্ͷHPUPCVHJEPSTFBSDICVHTGPSΛ࢖ͬͯ
    NC@DIFDL@FODPEJOHͱ͔4FHNFOUBUJPOGBVMUΛௐ
    ΂Δ
    ࣅͨΑ͏ͳใࠂ͸ͳ͔ͬͨ
    

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35. View Slide

36. w 1)1WFSTJPO1)13$
    w 1BDLBHFB⒎FDUFE(FOFSBM*TTVFT 3FQSPEVDJCMF
    DSBTI
    w #VHUZQF#VH
    w 0QFSBUJOHTZTUFN-JOVY
    w 4VNNBSZ 5FTU4DSJQU "DUVBMSFTVMU &YQFDUFESFTVMU
    ͕ॏཁ
    

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37. 4VNNBSZ
    w ؆ܿʹจͰΘ͔ΔΑ͏ͳจষΛॻ͘Α͏౒ΊΔ
    w όάΛߏ੒͢ΔཁૉNC@DIFDL@FODPEJOH DSBTI 4FHNFOUBUJPO
    GBVMU 4FHGBVMU 4&(7ʜ
    BSHVNFOU BSSBZ
    w NC@DIFDL@FODPEJOHͳͷ͔ʁ
    w DSBTIͰ௨͡Δ͔ʁ
    w BSHVNFOU͸Ҿ਺͕ͩɺͲͷҾ਺͔ʁ
    w BSSBZʹ΋ཁૉͷ͋ΔBSSBZͱແ͍BSSBZͱ͕͋Δ͕ɺ྆ํௐ΂͔ͨʁ
    

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38. 4VNNBSZͷจষͷ֬ೝ
    w όάΛߏ੒͢ΔཁૉNC@DIFDL@FODPEJOH DSBTI BSHVNFOU BSSBZ
    w DSBTIͰ௨͡Δ͔ʁ
    w ଞͷ4FHNFOUBUJPOGBVMUͷνέοτΛಡΜͰΈ͕ͨɺ໰୊ͳ͍Α͏ͩ
    w BSHVNFOU͸Ҿ਺͕ͩɺͲͷҾ਺͔ʁ
    w ࠷ॳͷҾ਺ͰҾ͖ى͜͞ΕΔɻୈೋҾ਺ͷFODPEJOHͰ͸ى͜Βͳ͔ͬͨ
    w BSSBZʹ΋ཁૉͷ͋ΔBSSBZͱແ͍BSSBZͱ͕͋Δ͕ɺ྆ํௐ΂͔ͨʁ
    w ۭͰ͸ͳ͍BSSBZ l΄͛z
    ͳͲΛௐ΂ͨΒɺ௨ৗऴྃͨ͠ͷͰɺۭͷBSSBZ
    ͷͱ͖ͷΈى͜Δ
    

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39. 4VNNBSZͷจষͷߏங
    w ཁૉΛվΊΔNC@DIFDL@FODPEJOH DSBTI pSTU
    BSHVNFOU FNQUZBSSBZ
    w NC@DIFDL@FODPEJOH
    DSBTIFTXIFOpSTUBSHVNFOU
    JTBOFNQUZBSSBZͱͨ͠
    

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40. %FTDSJQUJPO
    w ࢲ΋ӳޠ͕ಘҙͰͳ͍ͷͰɺଞͷνέοτΛࢀߟʹͯ͠ॻ
    ͍ͨɻ
    w WMPSHͰ΋࠶ݱͰ͖ͨͱ͍͏จষ͕ॻ͖͔ͨͬͨ
    

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41. &YQFDUFESFTVMU
    w ຊདྷਖ਼͍͠ڍಈ͸ͲΕʹͳΔͷ͔ͱ͍͏ͷΛ౴͑Δɻ1)1
    ͷ݁ՌΛฦͤ͹͍͍ͷͰܦݧଇʢຊεϥΠυલ൒෦෼ʣ্
    /6--ͱ͓ͯ͠͠·͍ʜͱࢥ͍͖΍
    w WMͷ݁ՌΛݟͯΈ·͠ΐ͏
    

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42. 1)1·Ͱ͸/6--Λฦ͍ͯ͠Δͷʹɺ
    1)1͔Β͸CPPM USVF
    ͱͳͬͯΔ
    

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43. 1)1ͷ$IBOHFMPHʹॻ͍ͯ͋ͬͨ
    

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44. &YQFDUFESFTVMU
    w ϚχϡΞϧʹͳ͘ɺ$IBOHFMPHʹ"EEFEBSSBZTVQQPSU
    UPNC@DIFDL@FODPEJOH͕͋ͬͨɻ
    w ݁Ռɺ͜ͷཝʹ͸CPPM USVF
    ͕ೖΔ
    

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45. "DUVBMSFTVMU
    w 4FHNFOUBUJPOGBVMUͱೖྗͨ͠
    

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46. ૹ৴
    w 1SFWJFXΛԿ౓͔ԡͯ͠ࢼߦࡨޡͯ͠ૹ৴
    w ͜ͷνέοτݸॻ͘ͷʹ࣌ؒҐ͔͔ͬͨɺ֬ೝ͢Δ͜ͱ͕༧
    ૝Ҏ্ʹଟ͔ͬͨɻ
    w Ͳ͏͢Ε͹όά͕ൃੜ͢Δͷ͔
    w Ͳ͏͢Ε͹όά͕ൃੜ͠ͳ͍ͷ͔
    w ͦͷόά͸طʹใࠂ͞Ε͍ͯͳ͍͔
    w IUUQTCVHTQIQOFUCVHQIQ JE
    

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47. DMPTF͞Ε·ͨ͠
    ෼͘Β͍ͰDMPTF͞Εͨ
    

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48. ൓লࣄ߲࣮͸ใࠂʹϛε͕
    ͋ͬͨ
    w NC@DIFDL@FODPEJOHͱ͍͏ͷ͸ɺ಺෦తʹ͸
    NC@DPOWFSU@FODPEJOHͷUP@FODPEJOHͱGSPN@FODPEJOH
    Λಉ͡ʹͯ͠ɺฦ٫஋͕ಉ͔͡Ͳ͏͔Λݟ͍ͯΔ
    w TUSNC@DPOWFSU@FODPEJOH TUS l65'z
    l65'z
    
    w ͭ·ΓɺNC@DIFDL@FODPEJOHʹ໰୊͕͋Δͱ͍͏͜ͱ
    ͸ɺNC@DPOWFSU@FODPEJOHʹ໰୊͕͋ΔՄೳੑ͕ߴ͍ͱ
    ͍͏͜ͱ
    

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49. NC@DIFDL@FODPEJOHͷฦΓ
    ஋ʹ͍ͭͯ
    w NC@DIFDL@FODPEJOHฒͼʹNC@DPOWFSU@FODPEJOH͸ɺ
    1)1͔ΒBSSBZΛड͚ೖΕΒΕΔΑ͏ʹͳͬͨ
    w NC@DIFDL@FODPEJOH BSSBZ
    l65'z
    ͸ɺ1)1Ͱ
    GBMTFɺ1)1ɺ1)1Ͱ/6--ɺ1)1ͰUSVFͱ
    ͳΔ
    

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50. NC@DIFDL@FODPEJOHͷฦΓ
    ஋ʹ͍ͭͯ
    1)1
    1)1

    1)1
    1)1PSIJHIFS
    '"-4& /6-- 536&
    NC@DIFDL@FODPEJOH BSSBZ
    
    ͸ɺ
    όʔδϣϯ͕มΘΔͱ࿦ཧ͕൓స͢Δ
    

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51. ײ૝ͳͲ
    w ڊେͳ044ͷ*TTVF͸ɺ֬ೝࣄ߲͕ଟ͘ɺ݅ใࠂ͢Δ͚ͩͰҙ
    ֎ͱ͕͔͔࣌ؒΔ
    w ใࠂ͢Δ·Ͱ͸Ͱ͖ΔݶΓͷਖ਼֬ͳใࠂʹ౒Ίͯͯເதͩͬͨɻ
    w ใࠂͯ͠ɺDMPTF͞Εͨͱ͖ɺੈքதʹӨڹΛٴ΅ͯ͠͠·ͬͨ
    ͜ͱʹؾ͕͍ͭͯಈ༳ͨ͠ɻ
    w ੈքதͷਓʑ͕ɺࢲͷ౿ΜͩόάΛ౿·ͳͯ͘ࡁΉɻخ͍͠
    w ·ͩ݅ใࠂ͚ͨͩ͠ͳͷͰɺ΋ͬͱ΍͍͖͍ͬͯͨͰ͢Ͷ
    

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52. ͓͠·͍Ͱ͢
    ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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53. ँࣙ
    w CVHͷใࠂͷ΍Γ͔ͨɾ৺ߏ͑Λڭ͑ͯ͘Ε·ͨ͠ɻ
    w IUUQTIOXIBUFOBCMPHDPNFOUSZ
    w 4VNNBSZͷॏཁ͞ΛؾΛ͚ͭΔ͜ͱ͕Ͱ͖·ͨ͠ɻ
    w IUUQTIJNPPLBIBUFCMPKQFOUSZ
    w ࠶ݱͰ͖ΔίʔυΛࣔͤΕ͹͍͍ΜͰ͢ɻݴ͍͍ͨ͜ͱ͕఻ΘΕ͹͍
    ͍ΜͰ͢ɻ
    

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