我认为经过一段时间的更新后，我的Django应用已经一次segfault开始运行了。以下是我尝试使用gdb进行调试的尝试，但是我看不到根本原因：
# gdb -ex=r --args ../pyenv/bin/python3 -X faulthandler manage.py runserver 127.0.0.1:8000
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Reading symbols from ../pyenv/bin/python3...(no debugging symbols found)...done.
Starting program: /home/narunas/website/www/pyenv/bin/python3 -X faulthandler manage.py runserver 127.0.0.1:8000
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Performing system checks...
System check identified no issues (0 silenced).
August 27, 2018 - 15:59:58
Django version 2.0, using settings 'website.settings.dev'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7de107b in kill () from /usr/lib/libc.so.6
(gdb) bt
#0 0x00007ffff7de107b in kill () from /usr/lib/libc.so.6
#1 0x00007ffff7a450b7 in ?? () from /usr/lib/libpython3.7m.so.1.0
#2 0x00007ffff7984ff3 in _PyMethodDef_RawFastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#3 0x00007ffff7985201 in _PyCFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#4 0x00007ffff79faf5d in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#5 0x00007ffff79847db in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#6 0x00007ffff79f63cd in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#7 0x00007ffff793d069 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#8 0x00007ffff7984982 in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#9 0x00007ffff79fa933 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#10 0x00007ffff793d069 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#11 0x00007ffff793e476 in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#12 0x00007ffff794d4f8 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#13 0x00007ffff793e7cb in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#14 0x00007ffff79f7a76 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#15 0x00007ffff793d069 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#16 0x00007ffff793e476 in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#17 0x00007ffff794d4f8 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#18 0x00007ffff793e7cb in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#19 0x00007ffff79f7a76 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#20 0x00007ffff793d069 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#21 0x00007ffff793e476 in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#22 0x00007ffff794d4f8 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#23 0x00007ffff793e7cb in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#24 0x00007ffff79f7a76 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#25 0x00007ffff793d069 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#26 0x00007ffff793e476 in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#27 0x00007ffff794d4f8 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#28 0x00007ffff793e7cb in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#29 0x00007ffff79f7a76 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#30 0x00007ffff79847db in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#31 0x00007ffff79f6225 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#32 0x00007ffff79847db in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#33 0x00007ffff79f6225 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#34 0x00007ffff793d069 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#35 0x00007ffff7984982 in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#36 0x00007ffff79f63cd in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#37 0x00007ffff793d069 in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#38 0x00007ffff793df34 in PyEval_EvalCodeEx () from /usr/lib/libpython3.7m.so.1.0
#39 0x00007ffff793df5c in PyEval_EvalCode () from /usr/lib/libpython3.7m.so.1.0
#40 0x00007ffff7a6c770 in ?? () from /usr/lib/libpython3.7m.so.1.0
#41 0x00007ffff7a6e54a in PyRun_FileExFlags () from /usr/lib/libpython3.7m.so.1.0
#42 0x00007ffff7a6fac5 in PyRun_SimpleFileExFlags () from /usr/lib/libpython3.7m.so.1.0
#43 0x00007ffff7a71a8f in ?? () from /usr/lib/libpython3.7m.so.1.0
#44 0x00007ffff7a72420 in _Py_UnixMain () from /usr/lib/libpython3.7m.so.1.0
#45 0x00007ffff7dcd223 in __libc_start_main () from /usr/lib/libc.so.6
#46 0x000055555555477a in _start ()
由于-X faulthandler标志，我还观察到以下内容：
Fatal Python error: Segmentation fault
Current thread 0x00007efe5b61c600 (most recent call first):
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/utils/autoreload.py", line 303 in python_reloader
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/utils/autoreload.py", line 330 in main
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 105 in run
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 98 in handle
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/core/management/base.py", line 335 in execute
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 61 in execute
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/core/management/base.py", line 288 in run_from_argv
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/core/management/__init__.py", line 365 in execute
File "/home/narunas/website/www/pyenv/lib/python3.7/site-packages/django/core/management/__init__.py", line 371 in execute_from_command_line
File "./manage.py", line 12 in <module>
以下是我项目中使用的一些模块：
Django<2.1
wagtail==2.2.1
wagtailmenus>=2.7.1
wagtail-condensedinlinepanel>=0.4.2
psycopg2-binary
django-debug-toolbar
django-extensions
ipython
libsass
django-compressor
django-sass-processor
django-ipware
requests
waitress
接下来要采取哪些步骤来发现这些segfaults的根本原因？
目前，我正在使用 Python 3.7 在 Arch Linux操作系统上进行调试。
我使用Python3.7编译了debugging symbols，因此现在观察以下backtrace：
(gdb) bt
#0 0x00007ffff7de007b in kill () from /usr/lib/libc.so.6
#1 0x00007ffff7c53fe7 in os_kill () from /usr/lib/libpython3.7m.so.1.0
#2 0x00007ffff7bc150a in _PyMethodDef_RawFastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#3 0x00007ffff7bc1851 in _PyCFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#4 0x00007ffff7c1284a in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#5 0x00007ffff7bccf7b in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#6 0x00007ffff7c0e040 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#7 0x00007ffff7bcbced in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#8 0x00007ffff7bcd1f2 in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#9 0x00007ffff7c121f6 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#10 0x00007ffff7bcbced in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#11 0x00007ffff7bcda0d in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#12 0x00007ffff7b95a63 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#13 0x00007ffff7b8b428 in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#14 0x00007ffff7c0f43d in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#15 0x00007ffff7bcbced in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#16 0x00007ffff7bcda0d in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#17 0x00007ffff7b95a63 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#18 0x00007ffff7b8b428 in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#19 0x00007ffff7c0f43d in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#20 0x00007ffff7bcbced in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#21 0x00007ffff7bcda0d in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#22 0x00007ffff7b95a63 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#23 0x00007ffff7b8b428 in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#24 0x00007ffff7c0f43d in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#25 0x00007ffff7bcbced in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#26 0x00007ffff7bcda0d in _PyFunction_FastCallDict () from /usr/lib/libpython3.7m.so.1.0
#27 0x00007ffff7b95a63 in _PyObject_Call_Prepend () from /usr/lib/libpython3.7m.so.1.0
#28 0x00007ffff7b8b428 in PyObject_Call () from /usr/lib/libpython3.7m.so.1.0
#29 0x00007ffff7c0f43d in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#30 0x00007ffff7bccf7b in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#31 0x00007ffff7c0dea3 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#32 0x00007ffff7bccf7b in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#33 0x00007ffff7c0dea3 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#34 0x00007ffff7bcbced in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#35 0x00007ffff7bcd1f2 in _PyFunction_FastCallKeywords () from /usr/lib/libpython3.7m.so.1.0
#36 0x00007ffff7c0e040 in _PyEval_EvalFrameDefault () from /usr/lib/libpython3.7m.so.1.0
#37 0x00007ffff7bcbced in _PyEval_EvalCodeWithName () from /usr/lib/libpython3.7m.so.1.0
#38 0x00007ffff7bcce34 in PyEval_EvalCodeEx () from /usr/lib/libpython3.7m.so.1.0
#39 0x00007ffff7bcce5c in PyEval_EvalCode () from /usr/lib/libpython3.7m.so.1.0
#40 0x00007ffff7c6f240 in run_mod () from /usr/lib/libpython3.7m.so.1.0
#41 0x00007ffff7c6f5de in PyRun_FileExFlags () from /usr/lib/libpython3.7m.so.1.0
#42 0x00007ffff7c71065 in PyRun_SimpleFileExFlags () from /usr/lib/libpython3.7m.so.1.0
#43 0x00007ffff7c72923 in pymain_main.constprop () from /usr/lib/libpython3.7m.so.1.0
#44 0x00007ffff7c72b50 in _Py_UnixMain () from /usr/lib/libpython3.7m.so.1.0
#45 0x00007ffff7dcc223 in __libc_start_main () from /usr/lib/libc.so.6
#46 0x000055555555477a in _start ()
(gdb) disassemble
Dump of assembler code for function kill:
0x00007ffff7de0070 <+0>: endbr64
0x00007ffff7de0074 <+4>: mov $0x3e,%eax
0x00007ffff7de0079 <+9>: syscall
=> 0x00007ffff7de007b <+11>: cmp $0xfffffffffffff001,%rax
0x00007ffff7de0081 <+17>: jae 0x7ffff7de0084 <kill+20>
0x00007ffff7de0083 <+19>: retq
0x00007ffff7de0084 <+20>: mov 0x185db5(%rip),%rcx # 0x7ffff7f65e40
0x00007ffff7de008b <+27>: neg %eax
0x00007ffff7de008d <+29>: mov %eax,%fs:(%rcx)
0x00007ffff7de0090 <+32>: or $0xffffffffffffffff,%rax
0x00007ffff7de0094 <+36>: retq
End of assembler dump.
(gdb) info registers
rax 0x0 0
rbx 0x80 128
rcx 0x7ffff7de007b 140737351909499
rdx 0x6e 110
rsi 0xb 11
rdi 0x6e93 28307
rbp 0x7ffff7d86bc0 0x7ffff7d86bc0 <_PyRuntime>
rsp 0x7fffffffc738 0x7fffffffc738
r8 0x0 0
r9 0x2c 44
r10 0x3a 58
r11 0x202 514
r12 0x7ffff7d59360 140737351357280
r13 0x7ffff7d40e88 140737351257736
r14 0x2 2
r15 0x7ffff72d14f8 140737340314872
rip 0x7ffff7de007b 0x7ffff7de007b <kill+11>
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
要确认现在存在debugging symbols：
$ file /usr/lib/libpython3.7m.so.1.0
/usr/lib/libpython3.7m.so.1.0: ELF 64-bit LSB pie executable x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=4a17d5aceb3c01ddb4cf598bca66c5954a08f65e, with debug_info, not stripped
$
$
$ objdump --syms /usr/lib/libpython3.7m.so.1.0 | head
/usr/lib/libpython3.7m.so.1.0: file format elf64-x86-64
SYMBOL TABLE:
0000000000000238 l d .note.gnu.build-id 0000000000000000 .note.gnu.build-id
0000000000000260 l d .gnu.hash 0000000000000000 .gnu.hash
0000000000003760 l d .dynsym 0000000000000000 .dynsym
0000000000010690 l d .dynstr 0000000000000000 .dynstr
000000000001a23e l d .gnu.version 0000000000000000 .gnu.version
000000000001b388 l d .gnu.version_r 0000000000000000 .gnu.version_r