I worked a bit on this package too, here are my findings:
```
Thread 2 "apache2" hit Breakpoint 2, 0x00005624ceb81420 in ap_rwrite ()
(gdb) bt
#0 0x00005624ceb81420 in ap_rwrite ()
#1 0x00007fe7c99bbe72 in req_write (self=0x7fe7c84df700, args=<optimized out>)
at
/home/ubuntu/libapache2-mod-python/libapache2-mod-python-3.5.0/src/requestobject.c:1590
#2 0x00007fe7c9501bce in ?? () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#3 0x00007fe7c948be4e in _PyEval_EvalFrameDefault () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#4 0x00007fe7c95d7e1f in ?? () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#5 0x00007fe7c948a58e in _PyEval_EvalFrameDefault () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#6 0x00007fe7c95d7e1f in ?? () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#7 0x00007fe7c948a58e in _PyEval_EvalFrameDefault () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#8 0x00007fe7c95d7e1f in ?? () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#9 0x00007fe7c948a58e in _PyEval_EvalFrameDefault () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#10 0x00007fe7c95d7e1f in ?? () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#11 0x00007fe7c94f8f48 in ?? () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#12 0x00007fe7c94f9143 in ?? () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#13 0x00007fe7c94f9825 in _PyObject_CallMethod_SizeT () from
target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0
#14 0x00007fe7c99c505c in python_handler (req=0x7fe7c93740a0, phase=<optimized
out>)
at
/home/ubuntu/libapache2-mod-python/libapache2-mod-python-3.5.0/src/mod_python.c:1535
#15 0x00005624ceb8dc08 in ap_run_handler ()
#16 0x00005624ceb8faf6 in ap_invoke_handler ()
#17 0x00005624cebb6678 in ap_process_async_request ()
#18 0x00005624cebb6d1b in ?? ()
#19 0x00005624ceba2d68 in ap_run_process_connection ()
#20 0x00007fe7c9a1d795 in ?? () from
target:/usr/lib/apache2/modules/mod_mpm_event.so
#21 0x00007fe7c9a1e13c in ?? () from
target:/usr/lib/apache2/modules/mod_mpm_event.so
#22 0x00007fe7c9c05b43 in start_thread (arg=<optimized out>) at
./nptl/pthread_create.c:442
#23 0x00007fe7c9c97b80 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
(gdb) up
#1 0x00007fe7c99bbe72 in req_write (self=0x7fe7c84df700, args=<optimized out>)
at
/home/ubuntu/libapache2-mod-python/libapache2-mod-python-3.5.0/src/requestobject.c:1590
1590 rc = ap_rwrite(buff, len, self->request_rec);
(gdb) p/x buff
$1 = 0x7fe700000000
(gdb) p/x *buff
Cannot access memory at address 0x7fe700000000
```
And indeed the segfault happens in a lower frame at this same address:
```
Thread 2 "apache2" received signal SIGSEGV, Segmentation fault.
__memmove_sse2_unaligned_erms () at
../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:416
416 ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No such file
or directory.
(gdb) display /i $pc
1: x/i $pc
=> 0x7fe7c9c35a60 <__memmove_sse2_unaligned_erms+96>: mov
-0x8(%rsi,%rdx,1),%rcx
(gdb) p/x $rsi
$2 = 0x7fe700000000
(gdb) p/x $rdx
$3 = 0xe
```
And I can't find this address in /proc/pid/maps, which is weird because
that would mean PyArg_ParseTuple returns a wrong address.
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https://bugs.launchpad.net/bugs/1960088
Title:
a) "collections" has no attribute "callable"; b) PY_SSIZE_T_CLEAN
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