如何在 python/pybinder 中捕获 corefile

Question

上下文：我有一个 python 脚本，调用用 C++ 实现的接口，并由 pybinder 公开。

据我了解，拥有 corefile 需要：

• 将 corefile 大小设置为无限制，默认为 0
• （可选） 在核心模式文件中设置 corefile 路径，或 apport 命令

这是我的程序，

# Enable process to corefile size.
resource.setrlimit(resource.RLIMIT_CORE, (resource.RLIM_INFINITY, resource.RLIM_INFINITY))

# Core pattern file indicates the destination of corefile, which could be a command to calculate destination (if starting with '|'), or a path. 
f = open("/proc/sys/kernel/core_pattern", "w")
f.write(r"kernel.core_pattern=/tmp/test_coredump/corefile.%e.%p")
f.close()

# Print to make sure it's correct.
f = open("/proc/sys/kernel/core_pattern", "r")
print(f.readlines())
f.close()

print("main function invoked")
obj: coredump_pybind.CoredumpObject
obj = coredump_pybind.GetObject()
obj.Run()
print("main function finishes, begin destructing")
# CoredumpObject is implemented in C++ and intentionally segfaults to test the script

我确实遇到了段错误

['kernel.core_pattern=/tmp/test_coredump/corefile.%e.%p\n']
main function invoked
WARNING: Logging before InitGoogleLogging() is written to STDERR
I20220329 00:07:21.942946 3537696 coredump.cc:10] construction
I20220329 00:07:21.942981 3537696 coredump_pybind.cc:10] CoredumpObject
I20220329 00:07:21.943009 3537696 coredump_pybind.cc:14] ~CoredumpObject
I20220329 00:07:21.943020 3537696 coredump.cc:18] destruction
Segmentation fault

我期望的是我可以在 /tmp/test_coredump/ 中找到 corefile（这是预先创建的），但在那里什么也没找到。

Answer 1

错误发生在

f.write(r"kernel.core_pattern=/tmp/test_coredump/corefile.%e.%p")

该错误应该是

f.write(r"/tmp/test_coredump/corefile.%e.%p")