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From: Roland McGrath <roland@redhat.com> To: Oleg Nesterov <oleg@tv-sign.ru> Cc: Andrew Morton <akpm@linux-foundation.org>, Alan Cox <alan@redhat.com>, Davide Libenzi <davidel@xmailserver.org>, "Eric W. Biederman" <ebiederm@xmission.com>, Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@linux-foundation.org>, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/3] orphaned pgrp fixes Date: Tue, 4 Mar 2008 17:11:17 -0800 (PST) [thread overview] Message-ID: <20080305011117.60EAA27010A@magilla.localdomain> (raw) In-Reply-To: Oleg Nesterov's message of Tuesday, 4 March 2008 18:51:13 +0300 <20080304155113.GC564@tv-sign.ru> > However, SIGNAL_STOP_STOPPED doesn't relaible with ptrace. I mean, ptracer > doesn't clear SIGNAL_STOP_STOPPED. This is btw one of the problems which > complicates fixing do_wait(WSTOPPED). We can clean that up too if you'd like to bring up the details. > As for SIGNAL_STOP_STOPPING... I am dreaming to find the way to eliminate > this lock-drop in get_signal_to_deliver(). Not sure this is possible, but > it is so nasty. For example, SIGNAL_STOP_DEQUEUED is racy, and I don't know > how to fix this. The patch we discussed some time ago doesn't really work > because dequeue_signal() drops the lock too. The latter is fixable afaics, > but needs very ugly changes. It all certainly deserves more careful thought. Thanks, Roland
next prev parent reply other threads:[~2008-03-05 1:12 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2008-03-02 18:44 [PATCH 0/3] orphaned pgrp fixes Oleg Nesterov 2008-03-04 12:26 ` Roland McGrath 2008-03-04 15:51 ` Oleg Nesterov 2008-03-05 1:11 ` Roland McGrath [this message] 2008-03-05 16:48 ` Oleg Nesterov 2008-03-05 17:11 ` Oleg Nesterov 2008-03-06 1:14 ` Eric W. Biederman 2008-03-07 1:52 ` Oleg Nesterov 2008-03-07 3:53 ` Roland McGrath
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