On 11/09, Andrey Ryabinin wrote: > > So, the ptrace() hangs if we try to attach to stopped task from freezing > cgroup.
OK, lets make it killable at least, TASK_KILLABLE looks better in any case. I am starting to think again that we should remove JOBCTL_TRAPPING, but this needs a bit more discussion and probably testing. Anyway I agree with Tejun, the freezer doesn't look nice too. Hmm. I need to re-check but it seems we have another problem... ptrace_stop() does task_participate_group_stop() and this (in particular) clears JOBCTL_STOP_PENDING. This is only correct if the task is still traced, but this is not necessarily true and we can in fact clear JOBCTL_STOP_PENDING set by __ptrace_unlink() called by the exiting tracer. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
