Killing CSRSS crashes the system

Log:

Memory at 0x0000002C could not be read: Page not present.
kdb:> bt
Eip:
<win32k.sys:7cb31 (subsystems/win32/win32k/ntuser/window.c:237 (@IntWinListChildren@4))>
Frames:
<win32k.sys:802c3 (subsystems/win32/win32k/ntuser/window.c:2395 (@co_UserDestroyWindow@4))>
<win32k.sys:803ba (subsystems/win32/win32k/ntuser/window.c:2470 (NtUserDestroyWindow@4))>
<NTOSKRNL.EXE:a149a (ntoskrnl/ke/i386/trap.s:244 (KiFastCallEntry))>
<ntdll.dll:5f1e>
<user32.dll:27820>
<user32.dll:288da>
<taskmgr.exe:5b70>
<taskmgr.exe:9aa7>
<taskmgr.exe:98e1>
<taskmgr.exe:98ff>
<kernel32.dll:22651>