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    SubjectRe: [PATCH] exec: Make do_coredump more robust and safer when using pipes in core_pattern
    On Wed, 2009-07-29 at 16:18 -0400, Neil Horman wrote:

    > On Wed, Jul 29, 2009 at 04:13:02PM +0100, Scott James Remnant wrote:
    > > On Mon, 2009-06-22 at 13:28 -0400, Neil Horman wrote:
    > >
    > > > 2) Allow for the kernel to wait for a core_pattern process to complete. One of
    > > > the things core_pattern processes might do is interrogate the status of a
    > > > crashing process via its /proc/pid directory. To ensure that that directory is
    > > > not removed prematurely, we wait for the process to exit prior to cleaning it
    > > > up.
    > > >
    > > Would this mean that the kernel would wait for the pattern process to
    > > complete before PANIC in the case of init core dumping?
    > >
    > > I'd find that useful :-)
    > >
    > Not without additional work. If init crashed in the initramfs, I don't think
    > theres a way to handle that. If it crashes at some later time, I think it just
    > gets restarted IIRC. I'm sure you can change that behavior, but this patch
    > doesn't address that.
    When the system init daemon crashes, the kernel PANICs. When not using
    core_pattern, this is ok, we get a core file - when using apport, as far
    as I can tell it never waits for apport to finish so we don't get the

    I was hoping that by waiting for the core_pattern process to finish,
    this might solve this issue.

    The other obvious fix I can apply to the init daemon is to reset the
    core pattern and deliberately dump core somewhere that can be picked up.

    > If you want to debug a custom init process, why not run a wrapper program as
    > init, that just forks the init you want to run and captures the core when it
    > crashes?
    Because then that's not the init daemon; it's not pid 1, it doesn't have
    processes reparented to it. And it's very annoying having the entire
    system reparented to gdb, which doesn't deal so well with that ;-)

    Scott James Remnant
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      Last update: 2009-07-31 22:23    [W:0.020 / U:6.236 seconds]
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