GNOME Bugzilla – Bug 774144
Multiseat support broken in Fedora 24
Last modified: 2020-10-30 14:32:07 UTC
I have a machine with two identical nvidia cards (nouveau driver) and I configured it with multiseat with Fedora 23 (gnome-session 3.18). Then I updated to Fedora 24 and it stopped to work. I have tested that multiseat works with the LiveCDs of Fedora 23 and Fedora 24, but no with the updated Fedora 24 (gnome-session-3.20.2-1.fc24.x86_64) . The error seems related with gnome-session-check-accelerated When I attach the second nvidia card to seat1, journalclt says systemd-logind[1314]: New session c6 of user gdm. systemd[1]: Started Session c6 of user gdm. gdm-launch-environment][2804]: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0) audit[2804]: USER_START pid=2804 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:session_open grantors=pam_keyinit,pam_keyinit,pam_limits,pam_systemd,pam_unix acct="gdm" exe="/usr/libexec/gdm-session-worker" hostname=? addr=? terminal=:6 res=success' audit[2821]: ANOM_ABEND auid=4294967295 uid=42 gid=42 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 pid=2821 comm="gnome-session-c" exe="/usr/libexec/gnome-session-check-accelerated" sig=11 kernel: show_signal_msg: 3 callbacks suppressed kernel: gnome-session-c[2821]: segfault at 71 ip 00007fb4b5655c8a sp 00007ffd216e9520 error 4 in libX11.so.6.3.0[7fb4b5629000+139000] Basically, /usr/libexec/gnome-session-check-accelerated crashes I have tried this with different video cards and all crash at this stage, is not nvidia specific. It's not related with selinux either. Permissive gives the same result
I can't get multiseat to work in fedora 24 either. From my logs: Nov 12 14:27:58 localhost.localdomain abrt-hook-ccpp[1381]: Process 1226 (gnome-session-check-accelerated) of user 42 killed by SIGSEGV - dumping core
It doesn't work in Fedora 25 either (updated from Fedora 24) gnome-session-3.22.1-2.fc25.x86_64
Assuming that this problem is obsolete nowadays. If you can still reproduce this problem with a recent version (currently: 3.38) of GNOME / gnome-session, then please report this at https://gitlab.gnome.org/GNOME/gdm/-/issues/ and follow https://wiki.gnome.org/Community/GettingInTouch/BugReportingGuidelines - thanks a lot!