Re: [regression, bisected] SysRq commands trigger without holdingsysrq.

From: Linus Torvalds
Date: Sun Jun 27 2010 - 10:13:17 EST

On Mon, 14 Jun 2010, Nick Bowler wrote:
> It appears that the new SysRq handling stuff totally ignores key
> releases: I don't have to hold down any of the keys to trigger sysrq
> commands. For example, if I press and release left-alt, then press and
> release print screen, then press b, the system reboots. The order in
> which I press the keys matters, but I can press other keys between them
> and still trigger sysrq commands (e.g. I can press and release alt, type
> a bunch, press print screen, then start triggering commands by pressing
> letters).
> The result is that it is very easy to accidentally trigger sysrq
> commands, to the detriment of a system's usefulness. It also renders
> the printscreen key completely useless after either alt key has been
> pressed once since system bootup (printscreen works fine until alt is
> pressed).
> Bisection reveals the following, and reverting the implicated commit
> (resolving a trivial conflict) solves the issue.
> 97f5f0cd8cd0a05449cbb77d1e6f02e026875802 is the first bad commit

Dmitry? I didn't see any follow-ups on this issue, should I just do the
revert, or is there some better fix?

There's another report about this from Éric Piel.

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