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Date:   Mon, 23 Nov 2020 16:27:20 +0100
From:   Marco Elver <>
To:     Steven Rostedt <>
Cc:     "Paul E. McKenney" <>,
        Anders Roxell <>,
        Andrew Morton <>,
        Alexander Potapenko <>,
        Dmitry Vyukov <>,
        Jann Horn <>,
        Mark Rutland <>,
        Linux Kernel Mailing List <>,
        Linux-MM <>,
        kasan-dev <>,,
        Peter Zijlstra <>,
        Tejun Heo <>,
        Lai Jiangshan <>
Subject: Re: [PATCH] kfence: Avoid stalling work queue task without

On Fri, Nov 20, 2020 at 02:27PM -0500, Steven Rostedt wrote:
> On Thu, 19 Nov 2020 13:53:57 +0100
> Marco Elver <> wrote:
> > Running tests again, along with the function tracer
> > Running tests on all trace events:
> > Testing all events: 
> > BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 12s!
> The below patch might be noisy, but can you add it to the kernel that
> crashes and see if a particular event causes the issue?
> [ note I didn't even compile test. I hope it works ;) ]
> Perhaps run it a couple of times to see if it crashes on the same set of
> events each time.

Thanks! I have attached the logs of 2 runs. I think one problem here is
that the enabling of an event doesn't immediately trigger the problem,
so it's hard to say which one caused it.

-- Marco

Download attachment "dmesg-1.xz" of type "application/x-xz" (36892 bytes)

Download attachment "dmesg-2.xz" of type "application/x-xz" (35088 bytes)

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