2010-08-09 5 views
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#1448 0x00303531 in ??() from /usr/lib/libXm.so.4 

... Et ça continue à # 1. La sortie ci-dessus signifie-t-elle que plusieurs adresses mémoire sont en cours d'écriture et qu'elles n'existent pas?Question GDB rapide; qu'est-ce que cela signifie si plusieurs emplacements de mémoire apparaissent comme?

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Est-ce un backtrace? –

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Y at-il des symboles compilés dans le code? – Starkey

+0

C'est un backtrace. Le code, en C++, essaie de lire dans un tampon contigu de données et essaie de le copier dans une structure C++. –

Répondre

5

Pour moi, il semble que votre pile est saccagée.

0x52455600 is REV (or VER) 
0x41434954 is ACIT (or TICA) 
0x4f465f4c is OF_L (or L_FO) 
0x2f2f6769 is //gi (or gi//) 
0x65766173 is evas (or save)! 
0x65746152 is etaR (or Rate)! 

La plupart des adresses restantes semblent donner de jolis caractères ascii.

Vous avez peut-être survolé un tampon.

+0

Je n'ai aucune idée de la raison pour laquelle quelqu'un est en train de downvoter des bonnes réponses, alors voici un upvote. –

+0

Parce que la réponse est probablement fausse. Il ne fait aucun doute que la pile * est * fausse. Mais la cause première est très probablement * non * la corruption de la pile, mais les binaires incompatibles. –

+0

@Emp: Si vous regardez les adresses, il semble y avoir des sauts sauvages là-bas. Par exemple: 0x20 ... à 0x70 ... à 0x30 .... Je m'attendrais à une certaine localité de référence dans ceux-ci. De plus, la plupart des adresses semblent être de bons caractères ASCII et certaines adresses répètent à des endroits impairs, ce qui en fait une étrange méthode récursive. OP dit aussi qu'ils essayaient de copier un tampon dans une structure. Ressemble à un débordement de mémoire tampon/mémoire pour moi. –

2

Cela signifie que le débogueur n'a aucune idée de ce que sont ces adresses de mémoire. Cela peut être dû au fait que les informations de débogage sont manquantes pour les éléments que vous déboguez, par exemple. dans une bibliothèque qui n'a pas d'informations de débogage. Bien que voir une trace aussi longue signifie généralement que vous avez détruit la pile, écrasé les informations dont le débogueur a besoin, menez votre programme si loin que le débogueur ou le programme n'ont plus aucune idée de ce qui se passe. (c'est-à-dire que vous avez un débordement de tampon quelque part, allumez valgrind et essayez de le trouver)

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