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我有我的PETSc中應用程序的壞終止。我已經查了一下是怎麼回事Valgrind的,但我不明白它的報告:爲什麼Valgrind的報告尺寸8對PETSc的一個char *的轉讓無效寫?
==97331== Invalid write of size 8
==97331== at 0x10007FED5: PetscHeaderCreate_Private (inherit.c:40)
==97331== by 0x1013EFE23: TSResilCreate (tsresil.c:525)
==97331== by 0x10139A877: TSGetResil (ts.c:5252)
==97331== by 0x10138D17E: TSSetFromOptions (ts.c:421)
==97331== by 0x100011A47: SolveODE (in ./ex31)
==97331== by 0x100012E98: main (in ./ex31)
==97331== Address 0x102dde080 is 1,776 bytes inside a block of size 1,780 alloc'd
==97331== at 0x100025EA1: malloc (vg_replace_malloc.c:303)
==97331== by 0x10010E8C1: PetscMallocAlign (mal.c:34)
==97331== by 0x10011063D: PetscTrMallocDefault (mtr.c:188)
==97331== by 0x1013EFDA0: TSResilCreate (tsresil.c:525)
==97331== by 0x10139A877: TSGetResil (ts.c:5252)
==97331== by 0x10138D17E: TSSetFromOptions (ts.c:421)
==97331== by 0x100011A47: SolveODE (in ./ex31)
==97331== by 0x100012E98: main (in ./ex31)
在tsresil.c:525(我在PETSc中實現):
ierr = PetscHeaderCreate(resil,TSRESIL_CLASSID,"TSResil","Time stepping resilience","TS",comm,TSResilDestroy,TSResilView);CHKERRQ(ierr);
在inherit.c :
22: /*
23: PetscHeaderCreate_Private - Creates a base PETSc object header and fills
24: in the default values. Called by the macro PetscHeaderCreate().
25: */
26: PetscErrorCode PetscHeaderCreate_Private(PetscObject h,PetscClassId classid,const char class_name[],const char descr[],const char mansec[],
27: MPI_Comm comm,PetscObjectDestroyFunction destroy,PetscObjectViewFunction view)
28: {
29: static PetscInt idcnt = 1;
30: PetscErrorCode ierr;
31: #if defined(PETSC_USE_LOG)
32: PetscObject *newPetscObjects;
33: PetscInt newPetscObjectsMaxCounts,i;
34: #endif
37: h->classid = classid;
38: h->type = 0;
39: h->class_name = (char*)class_name;
40: h->description = (char*)descr;
41: h->mansec = (char*)mansec;
...
甲PetscObject是一個指向:
typedef struct _p_PetscObject {
...
char *class_name; /* for example, "Vec" */
char *description;
...
因此,看來問題是關係到char* descr
的任務,但我不明白爲什麼。大小8會通知指針是錯誤的否?
這很難從上下文告訴,但它看起來像Valgrind是抱怨,因爲你只分配1780個字節的PetscObject,而這8個字節寫入(起始字節1776)就足以寫進你沒」記憶分配。請更新問題以顯示PetscObject如何分配。 – mpontillo
這很有道理! PetscObject的分配肯定太小了。等一下我會檢查 –
你讓我走向正確的方向。我不知道但是「所有的PETSc對象都以PETSCHEADER中定義的字段開頭。」將PETSCHEADER添加到我的PetscObject中解決了我的問題。 –