[PATCH][usercr]: Ghost tasks must be detached

Sukadev Bhattiprolu sukadev at linux.vnet.ibm.com
Thu Feb 10 14:31:59 PST 2011

Louis Rilling [Louis.Rilling at kerlabs.com] wrote:
| On 10/02/11  9:54 -0800, Sukadev Bhattiprolu wrote:
| > Louis Rilling [Louis.Rilling at kerlabs.com] wrote:

| > If it was a detached task, do_wait_thread() skipped over it. In the C/R
| > kernel we were setting the ->exit_signal to -1 for a "ghost" process. 
| > I assumed that the container-init exited without waiting for the "ghost"
| > and we were getting the crash in proc_flush_mnt() when the ghost exited.
| The point is that wait_consider_task() skips detached tasks as soon as they are
| not ptraced. So removing the check in do_wait_thread() should not have changed
| the behavior. Am I missing something?

No. I was :-) You are right that it did not change the behavior. I still
need to investigate why the crash does not occur on 2.6.37 even without
Eric's fix.


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