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Date: Thu, 19 Nov 2015 19:47:09 +0100 From: Oleg Nesterov <oleg@...hat.com> To: Andrew Morton <akpm@...ux-foundation.org>, Andrey Ryabinin <aryabinin@...tuozzo.com> Cc: Roland McGrath <roland@...k.frob.com>, Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>, Pedro Alves <palves@...hat.com>, Jan Kratochvil <jan.kratochvil@...hat.com> Subject: [PATCH 0/2] (Was: ptrace() hangs on attempt to seize/attach stopped & frozen task) 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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