$ LIBGL_DEBUG=verbose glxgears
libGL: OpenDriver: trying /usr/lib32/dri/tls/radeonsi_dri.so
libGL: OpenDriver: trying /usr/lib32/dri/radeonsi_dri.so
libGL: dlopen /usr/lib32/dri/radeonsi_dri.so failed (/usr/lib32/dri/radeonsi_dri.so: wrong ELF class: ELFCLASS32)
libGL: OpenDriver: trying /usr/lib64/dri/tls/radeonsi_dri.so
libGL: OpenDriver: trying /usr/lib64/dri/radeonsi_dri.so
libGL: dlopen /usr/lib64/dri/radeonsi_dri.so failed (/usr/lib64/dri/radeonsi_dri.so: undefined symbol: _mesa_sha1_compute)
libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL: OpenDriver: trying /usr/lib32/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib32/dri/swrast_dri.so
libGL: dlopen /usr/lib32/dri/swrast_dri.so failed (/usr/lib32/dri/swrast_dri.so: wrong ELF class: ELFCLASS32)
libGL: OpenDriver: trying /usr/lib64/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib64/dri/swrast_dri.so
libGL: dlopen /usr/lib64/dri/swrast_dri.so failed (/usr/lib64/dri/swrast_dri.so: undefined symbol: _mesa_sha1_compute)
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  154 (GLX)
  Minor opcode of failed request:  3 (X_GLXCreateContext)
  Value in failed request:  0x0
  Serial number of failed request:  36
  Current serial number in output stream:  38