Why does Slack return a Segmentation fault after Fedora 29 upgrade?

As @Flat noted, the included libnode.so doesn't work with fedora 29.

Download the latest atom.rpm from http://atom.io (I'd never heard of it before...)

Install it, move the bad lib out of the way and symlink the new one in place:

sudo dnf install ~/Downloads/atom.x86_64.rpm
sudo mv /usr/lib/slack/libnode.so /usr/lib/slack/libnode.so.bad
sudo ln -s /usr/share/atom/libnode.so /usr/lib/slack/libnode.so

There may be a better, or official source of libnode.so; but I looking quickly, I did not see one, and it wasn't installed anywhere else on my system.

With valgrind I obtained this output:

Process terminating with default action of signal 11 (SIGSEGV): dumping core
 Bad permissions for mapped region at address 0xDBF060
   at 0xDBF060: ??? (in /usr/lib/slack/slack)
   by 0x7112071: node::http2::Http2Session::Callbacks::Callbacks(bool) (in /usr/lib/slack/libnode.so)
   by 0x7112134: ??? (in /usr/lib/slack/libnode.so)
   by 0x5853CE9: call_init.part.0 (in /usr/lib64/ld-2.28.so)
   by 0x5853DE9: _dl_init (in /usr/lib64/ld-2.28.so)
   by 0x5845149: ??? (in /usr/lib64/ld-2.28.so)

It seems the issue is inside an "outdated" version of libnode.so. I just copied another version of libnode.so from the latest atom.rpm installation with:

sudo mv /usr/lib/slack/libnode.so /usr/lib/slack/libnode.so.old sudo ln -s /usr/share/atom/libnode.so /usr/lib/slack/libnode.so

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Edit

Like user Pierre Bellan already said, you can easily find other version of libnode.so on your OS with: sudo updatedb && locate libnode

I used the atom one because I was sure about a recent working update of the editor.