python 中的双重释放或损坏错误

Question

我在 replit 上使用 pygame 并收到一个不寻常的错误。

当您尝试两次释放相同的内存时，此错误通常来自 c 或 c++ 编译器，但这是 python。我认为这是一个重复问题，因为使用我的 python 安装在atom 中不会发生错误。这是完整的错误：

double free or corruption (!prev)
SIGABRT: abort
PC=0x7f20afd05baa m=0 sigcode=18446744073709551610
signal arrived during cgo execution

goroutine 1 [syscall, locked to thread]:
runtime.cgocall(0x4bb800, 0xc000061cd8)
    runtime/cgocall.go:156 +0x5c fp=0xc000061cb0 sp=0xc000061c78 pc=0x40651c
main._Cfunc_pry_eval_file(0x1ca4c10, 0x1ccf930, 0x1, 0x1d130e0)
    _cgo_gotypes.go:562 +0x4c fp=0xc000061cd8 sp=0xc000061cb0 pc=0x4b944c
main.Python.EvalFile.func5(0x1d130e0, 0x8, {0xc000012230, 0x0, 0x40ced5}, 0x0)
    github.com/replit/prybar/languages/python3/main.go:92 +0x75 fp=0xc000061d28 sp=0xc000061cd8 pc=0x4ba455
main.Python.EvalFile({}, {0x7fff05d4a31d, 0x7}, {0xc000012230, 0x0, 0x0})
    github.com/replit/prybar/languages/python3/main.go:92 +0x20c fp=0xc000061de0 sp=0xc000061d28 pc=0x4ba22c
main.(*Python).EvalFile(0x5d56d0, {0x7fff05d4a31d, 0x5d56d0}, {0xc000012230, 0x0, 0xc00007f110})
    <autogenerated>:1 +0x45 fp=0xc000061e18 sp=0xc000061de0 pc=0x4bb265
github.com/replit/prybar/utils.Language.EvalFile({{0x5075d0, 0x5d56d0}, {0x7fff05d4a307, 0xc000064100}}, {0x7fff05d4a31d, 0x7}, {0xc000012230, 0x0, 0x0})
    github.com/replit/prybar/utils/language.go:86 +0xa2 fp=0xc000061e78 sp=0xc000061e18 pc=0x4b8102
github.com/replit/prybar/utils.DoCli({0x5075d0, 0x5d56d0})
    github.com/replit/prybar/utils/utils.go:67 +0x2e8 fp=0xc000061f60 sp=0xc000061e78 pc=0x4b89a8
main.main()
    github.com/replit/prybar/languages/python3/generated_launch.go:7 +0x27 fp=0xc000061f80 sp=0xc000061f60 pc=0x4b8bc7
runtime.main()
    runtime/proc.go:255 +0x227 fp=0xc000061fe0 sp=0xc000061f80 pc=0x436d67
runtime.goexit()
    runtime/asm_amd64.s:1581 +0x1 fp=0xc000061fe8 sp=0xc000061fe0 pc=0x462e41

rax    0x0
rbx    0x6
rcx    0x7f20afd05baa
rdx    0x0
rdi    0x2
rsi    0x7fff05d48c40
rbp    0x7fff05d48f80
rsp    0x7fff05d48cb8
r8     0x0
r9     0x7fff05d48c40
r10    0x8
r11    0x200246
r12    0x7fff05d48ea0
r13    0x1000
r14    0x2
r15    0x7f2086992000
rip    0x7f20afd05baa
rflags 0x200246
cs     0x33
fs     0x0
gs     0x0
repl process died unexpectedly: exit status 2

该错误没有说明导致错误的原因，因此我在下面包含了完整的代码。导致这一情况发生的更改是将

-1

添加到第 69、71 和 73 行。

import pygame, random, math
pygame.init()
WIN_SIZE = (640, 480)
win = pygame.display.set_mode(WIN_SIZE)
pygame.display.set_caption("Anti-aliasing")
BLACK = (0, 0, 0)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
WHITE = (255, 255, 255)
win.fill(WHITE)

class point:
  def __init__(self, x, y):
    self.x = x
    self.y = y
class lineSegment:
  def __init__(self, p1, p2):
    self.p1 = p1
    self.p2 = p2
    self.v = point(p2.x - p1.x, p2.y - p1.y)
  def hray(self, y):
    if self.v.y == 0: return None
    n = (y - self.p1.y)/self.v.y
    if not 0<=n<=1: return None
    return self.p1.x + self.v.x * n
  def vray(self, x):
    if self.v.x == 0: return None
    n = (x - self.p1.x)/self.v.x
    if not 0<=n<=1: return None
    return self.p1.y + self.v.y * n
class tri:
  def __init__(self, p1, p2, p3):
    self.p1 = p1
    self.p2 = p2
    self.p3 = p3
    self.l1 = lineSegment(p2, p3)
    self.l2 = lineSegment(p3, p1)
    self.l3 = lineSegment(p1, p2)
    left = min(p1.x, p2.x, p3.x)
    top = min(p1.y, p2.y, p3.y)
    right = max(p1.x, p2.x, p3.x)
    bottom = max(p1.y, p2.y, p3.y)
    self.bounds = pygame.Rect(left, top, right - left, bottom - top)
  def hray(self, y):
    output = []
    l1r = self.l1.hray(y)
    if l1r != None:
      output.append(l1r - self.bounds.x)
    l2r = self.l2.hray(y)
    if l2r != None:
      output.append(l2r - self.bounds.x)
    l3r = self.l3.hray(y)
    if l3r != None:
      output.append(l3r - self.bounds.x)
    
    if len(output) == 0: return None
    if len(output) == 1:
      print("fuck")
      return None
    #print([min(output), max(output)])
    return [min(output), max(output)]
    
  def draw(self):
    surf = pygame.Surface((self.bounds.width, self.bounds.height), flags = pygame.SRCALPHA)
    array = pygame.PixelArray(surf)
    for y in range(self.bounds.height):
      mHray = self.hray(y + self.bounds.y)
      if mHray != None:
        array[round(mHray[0])-1 : round(mHray[1]), y] = BLACK
        shade = math.ceil(255 * (mHray[0]%1))
        array[round(mHray[0])-1 , y] = (shade, shade, shade)
        shade = math.ceil(255 * (mHray[1]%1))
        array[round(mHray[1])-1 , y] = (shade, shade, shade)
    array.close()
    win.blit(surf, (self.bounds.x, self.bounds.y))
    pygame.draw.rect(win, GREEN, self.bounds, 1)
    pygame.draw.circle(win, RED, (self.p1.x, self.p1.y), 2)
    pygame.draw.circle(win, RED, (self.p2.x, self.p2.y), 2)
    pygame.draw.circle(win, RED, (self.p3.x, self.p3.y), 2)
p1 = point(random.randrange(0, WIN_SIZE[0]), random.randrange(0, WIN_SIZE[1]))
p2 = point(random.randrange(0, WIN_SIZE[0]), random.randrange(0, WIN_SIZE[1]))
p3 = point(random.randrange(0, WIN_SIZE[0]), random.randrange(0, WIN_SIZE[1]))
mTri = tri(p1, p2, p3)
mTri.draw()
pygame.display.update()
print("done")

Answer 1

我已经做了很多调试，我想我知道问题是什么，由于从精确浮点坐标到数组坐标的错误转换，有时会输出负结果，或者更糟，但这似乎并没有打扰 pygame 因为如果上坐标低于下坐标，则可以进行切片。我猜测 pygame 的索引函数无法处理这个问题，并且不知道会给出什么错误。老实说，我不确定如何解决这个问题，因为它发生在我不确定自己应该做什么的边缘情况下，无论如何我认为这个问题已经结束。