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Date: Mon, 15 Jul 2019 15:29:11 +0200 From: Peter Zijlstra <peterz@...radead.org> To: "Paul E. McKenney" <paulmck@...ux.ibm.com> Cc: Dmitry Vyukov <dvyukov@...gle.com>, Theodore Ts'o <tytso@....edu>, syzbot <syzbot+4bfbbf28a2e50ab07368@...kaller.appspotmail.com>, Andreas Dilger <adilger.kernel@...ger.ca>, David Miller <davem@...emloft.net>, eladr@...lanox.com, Ido Schimmel <idosch@...lanox.com>, Jiri Pirko <jiri@...lanox.com>, John Stultz <john.stultz@...aro.org>, linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, netdev <netdev@...r.kernel.org>, syzkaller-bugs <syzkaller-bugs@...glegroups.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org> Subject: Re: INFO: rcu detected stall in ext4_write_checks On Sun, Jul 14, 2019 at 11:49:15AM -0700, Paul E. McKenney wrote: > On Sun, Jul 14, 2019 at 05:48:00PM +0300, Dmitry Vyukov wrote: > > But short term I don't see any other solution than stop testing > > sched_setattr because it does not check arguments enough to prevent > > system misbehavior. Which is a pity because syzkaller has found some > > bad misconfigurations that were oversight on checking side. > > Any other suggestions? > > Keep the times down to a few seconds? Of course, that might also > fail to find interesting bugs. Right, if syzcaller can put a limit on the period/deadline parameters (and make sure to not write "-1" to /proc/sys/kernel/sched_rt_runtime_us) then per the in-kernel access-control should not allow these things to happen.
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