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] [day] [month] [year] [list]
Date:	Wed, 13 Aug 2014 03:50:02 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	David Miller <davem@...emloft.net>
Cc:	hannes@...hat.com, eric.dumazet@...il.com, mleitner@...hat.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH stable 3.4 1/2] ipv4: move route garbage collector to work
 queue

Hi David,

On Wed, Aug 13, 2014, at 02:46, David Miller wrote:
> From: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Date: Wed, 13 Aug 2014 01:11:14 +0200
> 
> > On Wed, Aug 13, 2014, at 00:42, David Miller wrote:
> >> Just bite the bullet and put a spinlock around the GC operation.
> > 
> > We had a spinlock around the GC operation at first but still were
> > capable to cause softlockups, I don't remember if a complete lockup
> > happend.
> 
> This much I understand.
> 
> What I'm saying is retain this patch #1, in order to make the normal
> GCs run asynchronously via a work queue, but on top of that put a
> spinlock around the GC function.

I understood you correctly. ;)

The spin_lock would need to be _bh protected as it can be called from
softirq as well as in the wq. IIRC that was the problem. I'll follow up
with Marcelo to find a solution for this.

Thanks,
Hannes
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists