xf86-video-glamo: stopping X can crash the whole system (not even JTAG works)

[lindi]

Steps to reproduce:
1) sudo gdb
2) attach <pid-of-X>
3) break GlamoRestoreHW
4) continue
5) sudo kill pidof X
6) continue
7) continue
8) continue
9) continue

Expected results:
6-8) gdb stops due to three signals
9) gdb stops at GlamoRestoreHW and shows its prompt

Actual results:
6-9) gdb stops due to three signals and at GlamoRestoreHW. However, gdb is unable to show its prompt and the whole system stops responding. Even JTAG stops working:

(gdb) break GlamoRestoreHW
Breakpoint 1 at 0x405658b0: file glamo-driver.c, line 744.
(gdb) c
Continuing.

Program received signal SIGTERM, Terminated.
[Switching to Thread 0x40021c50 (LWP 1476)]
0x4039ffe4 in select () from /lib/libc.so.6
(gdb) c
Continuing.

Program received signal SIGTERM, Terminated.
0x000efac4 in ?? ()
(gdb) c
Continuing.

Program received signal SIGCONT, Continued.
0x000efd7c in GiveUp? ()
(gdb)
Continuing.

Breakpoint 1, GlamoRestoreHW (pScrn=0x1c02f8) at glamo-driver.c:744

More info:
1) xf86-video-glamo 451398a21
2) linux 9ecc089861ab238e
3) GDB is not strictly needed here. It is used here just to slow down Xorg so that it hits the bug always:

--- Log opened Sun May 10 08:23:26 2009
08:23 <lars_> i just updated to the newest kernel and i get a wsod every time i quit X

[lars]

The problem was caused by turning of the glamo memory clock and has been fixed with commit 69ccc9307c6b6a1aeb1f51ea732af20d52a66685

Closing as fixed