This is quite similar to https://bugzilla.redhat.com/show_bug.cgi?id=1509086 , but with a different problematic backtrace path. Basically it seems like currently in F27, this gnome-shell crash often happens:
#0 raise at ../sysdeps/unix/sysv/linux/raise.c:51
#1 dump_gjs_stack_on_signal_handler at ../src/main.c:372
#5 default_log_handler at ../src/main.c:315
#8 x_io_error at wayland/meta-xwayland.c:418
Usually with the message:
"Connection to xwayland lost"
All this tells us is that GNOME Shell crashed because XWayland crashed. However, all of these bugs at least for F27 are being marked as duplicates of https://bugzilla.redhat.com/show_bug.cgi?id=1510059 , even though they likely have nothing to do with each other.
There may well be a similar bug for F28, but I haven't found it yet, I'll have a look around.
Similar to the resolution for #1509086 , I think we need to 'blacklist' this path in satyr...
See also https://github.com/abrt/satyr/issues/271 and https://github.com/abrt/satyr/issues/272 , where I flagged up this "dump_gjs_stack_on_signal_handler" as being potentially problematic in this way.
I think https://github.com/abrt/satyr/commit/6383faff4959c751f71f107901897ff654e82615 should help with this, we just need that fix to go out to F27 (and probably F28 and Rawhide).
See also https://bugzilla.redhat.com/show_bug.cgi?id=1556831 , where it's proposed that Shell should just *not dump core* in this case.
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Moving this to 28, I'm not sure whether the fix made it there.
The fix for this bugzilla didn't make it to F27, but it should be fixed in Fedora 28+.