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Date:	Fri, 14 Feb 2014 17:08:54 +0100
From:	Oleg Nesterov <>
To:	Al Viro <>, Andrey Vagin <>
Cc:	Richard Weinberger <>,
	Christoph Hellwig <>,
	Linus Torvalds <>,
	Dave Chinner <>,
	Dave Jones <>,
	Eric Sandeen <>,
	Linux Kernel <>,
Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled.

On 02/14, Al Viro wrote:
> BTW, Oleg, could you explain why does PTRACE_PEEK_SIGINFO copy ->si_code
> separately?  IOW, why do we want the upper 16 bits of ->si_code exposed?
> It used to be a strictly internal thing IIRC (it's been what, 2.3.late?)

Yes, but checkpoint/restart tools want to dump/restore the internal part
of ->si_code too.

See also the "task_pid_vnr(current) == pid" hack in do_rt_sigqueueinfo(),
this allows to queue a SI_FROMKERNEL() siginfo.


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