[Python-Dev] seg fault in 3.10a4

Not sure if this is where I should report, but I have a segfault in reportlab userguide creation with 3.10a4. I am getting this info from coredumpctl running archlinux with

Linux hostname 5.10.6-arch1-1 #1 SMP PREEMPT Sat, 09 Jan 2021 18:22:35 +0000 x86_64 GNU/Linux

the error is Message: Process 1530711 (python) of user 1000 dumped core.

             Stack trace of thread 1530711:
             #0  0x00007f7c9bf72615 raise (libc.so.6 + 0x3d615)
             #1  0x00007f7c9bf5b862 abort (libc.so.6 + 0x26862)
             #2  0x00007f7c9bfb45e8 __libc_message (libc.so.6 + 0x7f5e8)
             #3  0x00007f7c9bfbc27a malloc_printerr (libc.so.6 + 0x8727a)
             #4  0x00007f7c9bfbd64c _int_free (libc.so.6 + 0x8864c)
             #5  0x00005631260a01dd n/a (/home/robin/devel/reportlab/.py310/bin/python310
+ 0x1401dd)

1) I compile this from source using the standard LTO method my script looks like

###### #

CFLAGS="-march=x86-64 -mtune=generic -O3 -pipe -fno-plt -fno-semantic-interposition" LDFLAGS="-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -rpath=$HOME/LOCAL/3.10.0a4/lib -fno-semantic-interposition"

./configure \ --prefix=$HOME/LOCAL/3.10.0a4 \ --with-computed-gotos \ --enable-optimizations \ --with-lto \ --enable-ipv6 \ --with-system-expat \ --with-dbmliborder=gdbm:ndbm \ --with-system-ffi \ --with-system-libmpdec \ --enable-loadable-sqlite-extensions && make EXTRA_CFLAGS="$CFLAGS" && make install

###### #

1) can I get more information using a different compile setup

2) or can I get more information with the python run. I just used

3) I am running in an old style virtual environment generated using a modified virtualenv 16.2.0 (to fix wrong usage of sys.version[:3] in path names)

4) All other tests seem fine including tests of image generation and the accelerated strinGWidths etc etc so I am a bit

mystified.

Robin Becker