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    SubjectRe: [RFC] [PATCH 00/19] Non disruptive application core dump infrastructure using task_work_add()
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    From: Tejun Heo <tj@kernel.org>
    To: Pavel Emelyanov <xemul@parallels.com>,
    Cc: Janani Venkataraman1/India/IBM@IBMIN,
    linux-kernel@vger.kernel.org, amwang@redhat.com,
    rdunlap@xenotime.net, andi@firstfloor.org,
    aravinda@linux.vnet.ibm.com, hch@lst.de, mhiramat@redhat.com,
    jeremy.fitzhardinge@citrix.com, suzuki@linux.vnet.ibm.com,
    kosaki.motohiro@jp.fujitsu.com, adobriyan@gmail.com,
    tarundsk@linux.vnet.ibm.com, vapier@gentoo.org,
    roland@hack.frob.com, ananth@linux.vnet.ibm.com,
    gorcunov@openvz.org, avagin@openvz.org, oleg@redhat.com,
    eparis@redhat.com, d.hatayama@jp.fujitsu.com,
    james.hogan@imgtec.com, akpm@linux-foundation.org,
    torvalds@linux-foundation.org
    Date: 10/08/2013 12:26 AM
    Subject: Re: [RFC] [PATCH 00/19] Non disruptive application core dump
    infrastructure using task_work_add()
    Sent by: Tejun Heo <htejun@gmail.com>



    Hello,

    On Fri, Oct 04, 2013 at 02:38:43PM +0400, Pavel Emelyanov wrote:
    > > * It is not upstream yet.
    >
    > It is, starting from criu-v0.7 + linux-3.11
    >
    > > * There are concerns about the security of the dump.
    >
    > Can you elaborate on this? Is it fixable in CRIU at all?
    >
    > > * It involves a lot of changes and this approach provides a UNIX style
    > > interface.
    >
    > Can you also shed more light on this -- what changes do you mean?

    Yeah, I'd like to hear more too. It doesn't make much sense to me to
    add something completely new if it can be served mostly by the
    existing infrastructure. Also, what do you mean by "disruption"? You
    mentioned signal but PTRACE_SEIZE is completely transparent
    w.r.t. signals. If you mean without stopping the target process's
    execution, what are you trying to use the dumping for and how much
    gain are we talking about? Also, isn't it kinda mandatory to stop the
    process to get a consistent dump? What am I missing here?

    By disruption we do mean not using signals. PTRACE_SEIZE doesn't use
    signals,
    but the concern is, a seize can't be done on oneself and we are looking at
    also
    a self dump.

    Thanks.
    Janani

    Thanks.

    --
    tejun





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