I see this in dmesg, where "X" varies from boot to boot but the rest seems constant:
lightdm[X]: segfault at 0 ip 00007Xe26 sp 00007ffeX8 error 4 in libc-2.24.so[7fX000+1bc000]
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This bug is still present with lightdm 1.15.0-15.
I've not noticed any visible behavior, except the kernel message.
It appears at each boot.
journalctl --since today | grep lightdm
mars 15 08:15:56 dryade.ebak.fr lightdm[709]: Could not enumerate user data directory /var/lib/lightdm-data: Error opening directory '/var/lib/lightdm-data': No such file or directory mars 15 08:15:56 dryade.ebak.fr lightdm[709]: Could not create user data directory /var/lib/lightdm-data/lightdm: Error creating directory /var/lib/lightdm-data/lightdm: No such file or directory mars 15 08:15:56 dryade.ebak.fr lightdm[767]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0) mars 15 08:15:56 dryade.ebak.fr systemd-logind[702]: New session c1 of user lightdm. mars 15 08:15:56 dryade.ebak.fr systemd[775]: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0) mars 15 08:16:06 dryade.ebak.fr lightdm[767]: pam_unix(lightdm-greeter:session): session closed for user lightdm mars 15 08:16:06 dryade.ebak.fr lightdm[709]: Could not create user data directory /var/lib/lightdm-data/bak: Error creating directory /var/lib/lightdm-data/bak: No such file or directory mars 15 08:16:06 dryade.ebak.fr lightdm[805]: pam_unix(lightdm:session): session opened for user bak by (uid=0) mars 15 08:16:06 dryade.ebak.fr systemd[776]: pam_unix(systemd-user:session): session closed for user lightdm mars 15 08:16:07 dryade.ebak.fr kernel: lightdm[833]: segfault at 0 ip 00007f7898971e26 sp 00007ffe2573ec68 error 4 in libc-2.24.so[7f78988e5000+1bc000] mars 15 08:16:07 dryade.ebak.fr lightdm[805]: gkr-pam: unlocked login keyring