未知错误：由于未知错误导致页面崩溃而删除会话：无法确定使用ChromeDriver Selenium崩溃的选项卡的加载状态

Question

我在使用InstaPy，它使用Python和Selenium。我启动每个Cron的脚本，它不时崩溃。所以它真的很不规则，有时它能很好地贯穿。我已经在GitHub Repo上发布过了，但是没有得到答案，所以我现在问这里是否有人知道原因。

这是一个数字海洋ubuntu服务器，我使用它的无头模式。驱动程序版本在日志中可见。以下是错误消息：

ERROR [2018-12-10 09:53:54] [user]  Error occurred while deleting cookies from web browser!
b'Message: invalid session id\n  (Driver info: chromedriver=2.44.609551 (5d576e9a44fe4c5b6a07e568f1ebc753f1214634),platform=Linux 4.15.0-42-generic x86_64)\n'
Traceback (most recent call last):
  File "/root/InstaPy/instapy/util.py", line 1410, in smart_run
    yield
  File "./my_config.py", line 43, in <module>
    session.follow_user_followers(['xxxx','xxxx','xxxx','xxxx'], amount=100, randomize=True, interact=True)
  File "/root/InstaPy/instapy/instapy.py", line 2907, in follow_user_followers
    self.logfolder)
  File "/root/InstaPy/instapy/unfollow_util.py", line 883, in get_given_user_followers
    channel, jumps, logger, logfolder)
  File "/root/InstaPy/instapy/unfollow_util.py", line 722, in get_users_through_dialog
    person_list = dialog_username_extractor(buttons)
  File "/root/InstaPy/instapy/unfollow_util.py", line 747, in dialog_username_extractor
    person_list.append(person.find_element_by_xpath("../../../*")
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webelement.py", line 351, in find_element_by_xpath
    return self.find_element(by=By.XPATH, value=xpath)
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webelement.py", line 659, in find_element
    {"using": by, "value": value})['value']
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webelement.py", line 633, in _execute
    return self._parent.execute(command, params)
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unknown error: session deleted because of page crash
from unknown error: cannot determine loading status
from tab crashed
  (Session info: headless chrome=70.0.3538.110)
  (Driver info: chromedriver=2.44.609551 (5d576e9a44fe4c5b6a07e568f1ebc753f1214634),platform=Linux 4.15.0-42-generic x86_64)

During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
  File "/root/InstaPy/instapy/instapy.py", line 3845, in end
    self.browser.delete_all_cookies()
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 878, in delete_all_cookies
    self.execute(Command.DELETE_ALL_COOKIES)
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: chrome not reachable
  (Session info: headless chrome=71.0.3578.80)
  (Driver info: chromedriver=2.44.609551 (5d576e9a44fe4c5b6a07e568f1ebc753f1214634),platform=Linux 4.15.0-42-generic x86_64)

你知道原因是什么，怎么解决吗？

Answer 1

尽管你认为错误是：

Error occurred while deleting cookies from web browser!
b'Message: invalid session id\n  (Driver info: chromedriver=2.44.609551 (5d576e9a44fe4c5b6a07e568f1ebc753f1214634),platform=Linux 4.15.0-42-generic x86_64)\n'

主要的例外是：

selenium.common.exceptions.WebDriverException: Message: unknown error: session deleted because of page crash
from unknown error: cannot determine loading status
from tab crashed

你的代码测试会给我们一些出错的线索。

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解决方案

这个问题有不同的解决办法。但是，根据UnknownError: session deleted because of page crash from tab crashed这一问题可以通过以下任一解决方案解决：

• 添加以下chrome_options：

  chrome_options.add_argument('--no-sandbox')         
  

• 由于页面太小，Chrome似乎在Docker容器中崩溃。因此，您可能需要修复较小的/dev/shm大小。

• 例如：

  sudo mount -t tmpfs -o rw,nosuid,nodev,noexec,relatime,size=512M tmpfs /dev/shm
  

• 如果使用-v /dev/shm:/dev/shm选项共享主机/dev/shm

• 另一种方法是将chrome_options添加为--disable-dev-shm-usage。这将强制Chrome使用/tmp目录。但这可能会减慢执行速度，因为将使用磁盘而不是内存。

  chrome_options.add_argument('--disable-dev-shm-usage')        
  

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从tab崩溃

来自tab crashed的was WIP（Work-In-Progress）和Chromium团队在相当长的一段时间内，这与Linux试图总是对不可执行内存使用/dev/shm有关。以下是参考资料：

• Linux: Chrome/Chromium SIGBUS/Aw, Snap! on small /dev/shm
• Chrome crashes/fails to load when /dev/shm is too small, and location can't be overridden
• 根据Comment61#Issue 736452的说法，修复程序似乎已在Chrome v65.0.3299.6上着陆

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参考

您可以在org.openqa.selenium.SessionNotCreatedException: session not created exception from tab crashed error when executing from Jenkins CI server中找到详细的讨论