linux-kernel - Re: [PATCH v2 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at kernel/locking/rtmutex.c:997!

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:	Tue, 07 Apr 2015 13:47:16 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Thavatchai Makphaibulchoke <tmac@...com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, mingo@...hat.com,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 1/2] rtmutex Real-Time Linux: Fixing kernel BUG at
 kernel/locking/rtmutex.c:997!

On Tue, 2015-04-07 at 13:23 +0200, Thomas Gleixner wrote:
> On Mon, 6 Apr 2015, Thavatchai Makphaibulchoke wrote:
> 
> > This patch fixes the problem that the ownership of a mutex acquired
> > by an interrupt handler(IH) gets incorrectly attributed to the
> > interrupted thread.
> 
> An hard interrupt handler is not allowed to take a mutex. End of
> story, nothing to fix here.

Well, the patch that started this thread..

timers-do-not-raise-softirq-unconditionally.patch

..(attributed to you) was picked up in -rt (perhaps erroneously) to 
get nohz_full working, and then reverted due to the deadlock detector 
getting properly angry.  All of this is about reinstating it.

I posted a patchlet to simply subtract softirqd from the ->nr_running 
check, which gets nohz_full working in -rt sans illegal activity.

        -Mike
--
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/