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  • xenomaixenomai
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  • ipipe
  • fs
  • coredump.c
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  • Andrey Ryabinin's avatar
    coredump: fix unfreezable coredumping task · 70d78fe7
    Andrey Ryabinin authored Nov 10, 2016
    It could be not possible to freeze coredumping task when it waits for
    'core_state->startup' completion, because threads are frozen in
    get_signal() before they got a chance to complete 'core_state->startup'.
    
    Inability to freeze a task during suspend will cause suspend to fail.
    Also CRIU uses cgroup freezer during dump operation.  So with an
    unfreezable task the CRIU dump will fail because it waits for a
    transition from 'FREEZING' to 'FROZEN' state which will never happen.
    
    Use freezer_do_not_count() to tell freezer to ignore coredumping task
    while it waits for core_state->startup completion.
    
    Link: http://lkml.kernel.org/r/1475225434-3753-1-git-send-email-aryabinin@virtuozzo.com
    
    
    Signed-off-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
    Acked-by: default avatarPavel Machek <pavel@ucw.cz>
    Acked-by: default avatarOleg Nesterov <oleg@redhat.com>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
    Cc: Michal Hocko <mhocko@kernel.org>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    70d78fe7

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