linux-kernel - Re: [QUESTION] Hung task warning while running syzkaller test

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Date:   Mon, 28 Oct 2019 18:54:22 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Zhihao Cheng <chengzhihao1@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>, peterz@...radead.org,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        patrick.bellasi@....com, tglx@...utronix.de
Cc:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        "zhangyi (F)" <yi.zhang@...wei.com>
Subject: Re: [QUESTION] Hung task warning while running syzkaller test

On 26/10/2019 03:48, Zhihao Cheng wrote:> 3. You can convert the repro file into a C program by 'syzprog' tool(see syzprog.c). Using compiled syzprog.c directly for testing did not show hung task, which confused me.
> 

Good to know that you can get a readable program out of this, but that diff
in behaviour isn't reassuring.

Also, I don't see anything in there that would try to play with cgroups - I
was mostly curious about the use of the freezer, but don't see any in the
C code. Out of curiosity I ran a similar kernel that I tried before (without
the right configs), and it doesn't complain about missing cgroup options...