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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Wed, 9 Sep 2020 15:51:05 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     syzbot <syzbot+8267241609ae8c23b248@...kaller.appspotmail.com>,
        davem@...emloft.net, jhs@...atatu.com, jiri@...nulli.us,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        xiyou.wangcong@...il.com
Subject: Re: INFO: rcu detected stall in cleanup_net (4)

On Wed, 09 Sep 2020 14:54:36 -0700 Vinicius Costa Gomes wrote:
> > Vinicius, could you please take a look at all the syzbot reports which
> > point to your commit? I know syzbot bisection is not super reliable,
> > but at least 3 reports point to your commit now, so something's
> > probably going on.  
> 
> I did take a look, and it seems that it all boils down to having too
> small (unreasonable?) intervals in the schedule, which causes the
> hrtimer handler to starve the other kernel threads.
> 
> I have a quick fix to restrict the interval values to more sensible
> values (at least equal to the time it takes to transmit the mininum
> ethernet frame size), I am testing it and I will propose it soon. But a
> proper solution will require more time.

Great, thank you!

Powered by blists - more mailing lists