I did not have this error before the update, and I didn't see libdrm updated alongside with noveau, so the only conclusion I could make - libdrm was not updated. A little googling proved this as people were complaining about the same issue.
The backtrace tells me nothing. If it tells you something, please explain.
Let me explain. After an update X didn't start, so I looked into the log. The only place which mentions an error in log is this:
[ 0.212974] (EE) NOUVEAU(0): wrong DRM version
[ 0.213053] (EE) NOUVEAU(0): DRI pre-initialisation failed. Setting NoAccel
I did not have this error before the update, and I didn't see libdrm updated alongside with noveau, so the only conclusion I could make - libdrm was not updated. A little googling proved this as people were complaining about the same issue.
The backtrace tells me nothing. If it tells you something, please explain.