Quoting Oren Laadan (orenl@xxxxxxxxxxx):
> From: Oren Laadan <orenl@xxxxxxxxxxxxxxx>
>
> One may not call task_pid_vnr() on dead tasks because they don't have
> a valid ->nxproxy pointer. However, the ckpt_ctx cleanup may be called
> by a dead task from do_exit(), in the case of zombie or "ghost" tasks.
>
> This patch makes ckpt_debug() safe to call from dead tasks context, so
> that debug printing from code called by ckpt_ctx_free() is cool.
>
> Signed-off-by: Oren Laadan <orenl@xxxxxxxxxxxxxxx>
Acked-by: Serge Hallyn <serue@xxxxxxxxxx>
thanks,
-serge
> ---
> include/linux/checkpoint.h | 4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h
> index e00dd70..5294a96 100644
> --- a/include/linux/checkpoint.h
> +++ b/include/linux/checkpoint.h
> @@ -334,7 +334,9 @@ extern unsigned long ckpt_debug_level;
> do { \
> if (ckpt_debug_level & (level)) \
> printk(KERN_DEBUG "[%d:%d:c/r:%s:%d] " fmt, \
> - current->pid, task_pid_vnr(current), \
> + current->pid, \
> + current->nsproxy ? \
> + task_pid_vnr(current) : -1, \
> __func__, __LINE__, ## args); \
> } while (0)
>
> --
> 1.6.0.4
>
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