Recently I've tried to compile kernel with grsec patch to increase security of my machine. Compilation went even smoothly, but after running new kernel system runs until xserver starts.

Here's tailed dmesg:

[ 43.753694] [drm:radeon_cs_ioctl] ERROR Invalid command stream !

[ 45.917078] Forbidden register 0x4028 in cs at 40

[ 45.917082] [drm:radeon_cs_ioctl] ERROR Invalid command stream !

[ 45.918384] Forbidden register 0x4028 in cs at 40

[ 45.918387] [drm:radeon_cs_ioctl] ERROR Invalid command stream !

[ 45.918654] Forbidden register 0x4028 in cs at 40

[ 45.918656] [drm:radeon_cs_ioctl] ERROR Invalid command stream !

Steps which I've compiled kernel source:

1) instaled needed packages for compiling kernel source

2) downloaded matching kernel version for grsec and unpacked to /usr/src/

3) applied grsec patch

4) copied and loaded config of current kernel from /boot

5) compiled and made .deb package

6) installed and rebooted

Any advice for this problem? I cannot run xserver letting network connect to my wifi network with wpa2.