linux-kernel - Re: INFO: task hung in btrfs_alloc_tree

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Message-ID: <CACkBjsbUnPQ1J5HpXW-be2jb_h2k8d4b2p-epp5pUek_Rf0reQ@mail.gmail.com>
Date:   Tue, 14 Sep 2021 11:22:42 +0800
From:   Hao Sun <sunhao.th@...il.com>
To:     Qu Wenruo <quwenruo.btrfs@....com>
Cc:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: INFO: task hung in btrfs_alloc_tree_block

Qu Wenruo <quwenruo.btrfs@....com> 于2021年9月14日周二 上午11:13写道：
>
>
>
> On 2021/9/14 上午10:44, Hao Sun wrote:
> > Hello,
> >
> > When using Healer to fuzz the latest Linux kernel, the following crash
> > was triggered.
> >
> > HEAD commit: 6880fa6c5660 Linux 5.15-rc1
> > git tree: upstream
> > console output:
> > https://drive.google.com/file/d/1U3ei_jCODG9N5UHOspSRmykrEDSey3Qn/view?usp=sharing
> > kernel config: https://drive.google.com/file/d/1rUzyMbe5vcs6khA3tL9EHTLJvsUdWcgB/view?usp=sharing
>
> Any recorded info for the injected errors during the test?
>
> It's hanging on a tree lock, without knowing the error injected, it's
> really hard to find out what's the cause.
>

The `task hang` happened without any fault injection.
Based on the recorded logs
(https://drive.google.com/file/d/1x7u4JfyeL8WhetacBsPDVXm48SvVJUo7/view?usp=sharing
and https://drive.google.com/file/d/1U3ei_jCODG9N5UHOspSRmykrEDSey3Qn/view?usp=sharing),
no fault-injection log was printed before the task hang.

Regards
Hao