For me this happens even when logging out admin users.
From kdm.log: (EE) intel(0): Couldn't create pixmap for fbcon *** glibc detected *** /usr/bin/X: double free or corruption (fasttop): 0x00000000037f4f00 *** ======= Backtrace: ========= /lib/libc.so.6(+0x775b6)[0x7f270b1e95b6] /lib/libc.so.6(cfree+0x73)[0x7f270b1efe53] /usr/bin/X(dixFreePrivates+0x84)[0x44a304] /usr/bin/X[0x42625d] /lib/libc.so.6(__libc_start_main+0xfd)[0x7f270b190c4d] /usr/bin/X[0x425d59]
For me this happens even when logging out admin users.
From kdm.log: so.6(+0x775b6) [0x7f270b1e95b6 ] so.6(cfree+ 0x73)[0x7f270b1 efe53] X(dixFreePrivat es+0x84) [0x44a304] X[0x42625d] so.6(__ libc_start_ main+0xfd) [0x7f270b190c4d ] X[0x425d59]
(EE) intel(0): Couldn't create pixmap for fbcon
*** glibc detected *** /usr/bin/X: double free or corruption (fasttop): 0x00000000037f4f00 ***
======= Backtrace: =========
/lib/libc.
/lib/libc.
/usr/bin/
/usr/bin/
/lib/libc.
/usr/bin/