So I just got around to testing this today. Using NO_TCL locks the
machine immediately:
[drm:drm_lock_take] *ERROR* 4 holds heavyweight lock
X isn't spinning the CPU, but the overall effect is the same. When I
move the mouse it's doing:
ioctl(5, 0x4008642a, 0x7ffffffff448) = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(7, [5 6], NULL, NULL, {0, 0}) = 1 (in [6], left {0, 0})
rt_sigprocmask(SIG_BLOCK, [IO], [IO], 8) = 0
read(6, "\10\3\4\0", 64) = 4
rt_sigprocmask(SIG_BLOCK, [], [IO], 8) = 0
select(1024, [6], NULL, NULL, {0, 0}) = 0 (Timeout)
rt_sigreturn(0x1) = -1 EINTR (Interrupted system call)
ioctl(5, 0x4008642a, 0x7ffffffff448) = ? ERESTARTSYS (To be restarted)
Also, I tried to kill X using a sysrq-k and got:
SysRq : SAK
Badness in set_palette at drivers/char/vt.c:2918
Call Trace:<ffffffff8022391c>{set_palette+60} <ffffffff802244db>{__handle_sysrq+107}
<ffffffff80195bd5>{write_sysrq_trigger+53} <ffffffff80166510>{vfs_write+192}
<ffffffff80166663>{sys_write+83} <ffffffff8010d13a>{system_call+126}
-ryan
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