linux-kernel - Re: frequent lockups in 3.18rc4

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 for Android: free password hash cracker in your pocket

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

Date:	Tue, 2 Dec 2014 14:10:31 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dâniel Fraga <fragabr@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Tue, Dec 02, 2014 at 08:01:49PM -0200, Dâniel Fraga wrote:
> On Tue, 2 Dec 2014 12:56:36 -0800
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > And I left out a step.  Let's make sure that my preempt_disabled() hack
> > to CONFIG_TREE_PREEMPT_RCU=y has the same effect as the Kconfig hack
> > that allowed CONFIG_PREEMPT=y and CONFIG_TREE_PREEMPT_RCU=n.  Could you
> > please try out the following patch configured with CONFIG_PREEMPT=y
> > and CONFIG_TREE_PREEMPT_RCU=y?
> 
> 	Of course! I applied your patch to 3.17 stock kernel and after
> stressing it (compiling with -j8 and watching videos on Youtube) to
> trigger the bug I got the following:

Thank you!!!

Was this as difficult to trigger as the version with the Kconfig hack
that used CONFIG_PREEMPT=y and CONFIG_TREE_PREEMPT_RCU=n?

							Thanx, Paul

> Dec  2 19:47:25 tux kernel: [  927.973547] INFO: rcu_preempt detected stalls on CPUs/tasks: { 5} (detected by 1, t=60002 jiffies, g=71142, c=71141, q=0)
> Dec  2 19:47:26 tux kernel: [  927.973553] Task dump for CPU 5:
> Dec  2 19:47:26 tux kernel: [  927.973555] cc1             R  running task        0 30691  30680 0x00080008
> Dec  2 19:47:26 tux kernel: [  927.973558]  ffff88021f351bc0 ffff8801d5743f00 ffffffff8107062a ffff88021f351c38
> Dec  2 19:47:26 tux kernel: [  927.973560]  ffff8801d5743ea8 ffff8800cd3b0000 ffff8800cd3b041c 0000000000000000
> Dec  2 19:47:26 tux kernel: [  927.973562]  00007f89b4d7d8e8 00007f89b5939a60 ffff88021f34d2c0 00007f89b4d7f000
> Dec  2 19:47:26 tux kernel: [  927.973564] Call Trace:
> Dec  2 19:47:26 tux kernel: [  927.973573]  [<ffffffff8107062a>] ? pick_next_task_fair+0x6aa/0x890
> Dec  2 19:47:26 tux kernel: [  927.973577]  [<ffffffff81087483>] ? rcu_eqs_enter+0x93/0xa0
> Dec  2 19:47:26 tux kernel: [  927.973579]  [<ffffffff81087f2e>] ? rcu_user_enter+0xe/0x10
> Dec  2 19:47:26 tux kernel: [  927.973582]  [<ffffffff8103935a>] ? do_page_fault+0x5a/0x70
> Dec  2 19:47:26 tux kernel: [  927.973585]  [<ffffffff8139bed2>] ? page_fault+0x22/0x30
> Dec  2 19:47:30 tux kernel: [  932.471964] CPU1: Core temperature above threshold, cpu clock throttled (total events = 820)
> Dec  2 19:47:30 tux kernel: [  932.471966] CPU6: Package temperature above threshold, cpu clock throttled (total events = 2624)
> Dec  2 19:47:30 tux kernel: [  932.471967] CPU3: Package temperature above threshold, cpu clock throttled (total events = 2624)
> Dec  2 19:47:30 tux kernel: [  932.471968] CPU7: Package temperature above threshold, cpu clock throttled (total events = 2624)
> Dec  2 19:47:30 tux kernel: [  932.471969] CPU0: Package temperature above threshold, cpu clock throttled (total events = 2624)
> Dec  2 19:47:30 tux kernel: [  932.471970] CPU2: Package temperature above threshold, cpu clock throttled (total events = 2624)
> Dec  2 19:47:30 tux kernel: [  932.471978] CPU1: Package temperature above threshold, cpu clock throttled (total events = 2624)
> Dec  2 19:47:30 tux kernel: [  932.472922] CPU1: Core temperature/speed normal
> Dec  2 19:47:30 tux kernel: [  932.472923] CPU6: Package temperature/speed normal
> Dec  2 19:47:31 tux kernel: [  932.472923] CPU2: Package temperature/speed normal
> Dec  2 19:47:31 tux kernel: [  932.472924] CPU3: Package temperature/speed normal
> Dec  2 19:47:31 tux kernel: [  932.472925] CPU0: Package temperature/speed normal
> 
> 	Waiting for your next instructions.
> 
> -- 
> Linux 3.17.0-dirty: Shuffling Zombie Juror
> http://www.youtube.com/DanielFragaBR
> http://exchangewar.info
> Bitcoin: 12H6661yoLDUZaYPdah6urZS5WiXwTAUgL
> 

--
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/