linux-kernel - Re: [RFC,PATCH 5/5] exec: RT sub-thread can livelock and monopolize CPU on exec

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 19 Aug 2007 12:45:52 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gautham R Shenoy <ego@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC,PATCH 5/5] exec: RT sub-thread can livelock and monopolize CPU on exec

> The group_leader can sleep before it enters exit_notify(). In that case
> wait_task_inactive() returns, and we still need some polling to wait for
> EXIT_ZOMBIE.

It could be a loop as now with yield.  It's still polling, but only one
poll per wakeup of the target.

> Yes sure. But in any case I think we should avoid polling, we need some
> notification from exit_notify().

Indeed.


Thanks,
Roland
-
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/