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Date:   Mon, 15 Jul 2019 15:29:11 +0200
From:   Peter Zijlstra <>
To:     "Paul E. McKenney" <>
Cc:     Dmitry Vyukov <>, Theodore Ts'o <>,
        syzbot <>,
        Andreas Dilger <>,
        David Miller <>,,
        Ido Schimmel <>,
        Jiri Pirko <>,
        John Stultz <>,, LKML <>,
        netdev <>,
        syzkaller-bugs <>,
        Thomas Gleixner <>,
        Ingo Molnar <>
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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