linux-kernel - Re: Hung Task Linux 4.13-rc7 Reiserfs

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Message-ID: <CAASgV=tjsY1tdxryj_3_TeA_N_SjbXUoUfVd8fu33+dHTx13tw@mail.gmail.com>
Date:   Sat, 30 Sep 2017 15:20:25 -0400
From:   Shankara Pailoor <sp3485@...umbia.edu>
To:     LKML <linux-kernel@...r.kernel.org>,
        reiserfs-devel@...r.kernel.org, linux-mm@...ck.org
Cc:     Andrew Zhu Aday <andrew.aday@...umbia.edu>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: Hung Task Linux 4.13-rc7 Reiserfs

Hi,

I have a reproducer program. It takes about 3-5 minutes to trigger the
hang. The only calls are mmap, open, write, and readahead and the
writes are fairly small (512 bytes).

Reproducer Program: https://pastebin.com/cx1cgABc
Report: https://pastebin.com/uGTAw45E
Logs: https://pastebin.com/EaiE0JLf
Kernel Configs: https://pastebin.com/i6URdADw

Regards,
Shankara

On Fri, Sep 29, 2017 at 11:56 PM, Shankara Pailoor <sp3485@...umbia.edu> wrote:
> Hi,
>
> I am fuzzing the kernel 4.13-rc7 with Syzkaller with Reiserfs. I am
> getting the following crash:
>
> INFO: task kworker/0:3:1103 blocked for more than 120 seconds.
>
>
> Here is the full stack trace. I noticed that there are a few tasks
> holding a sbi->lock. Below are a report and a log of all the programs
> executing at the time of the incident.
>
>
> Report: https://pastebin.com/uGTAw45E
> Logs: https://pastebin.com/EaiE0JLf
> Kernel Configs: https://pastebin.com/i6URdADw
>
> I don't have a reproducer yet and any assistance would be appreciated.
>
> Regards,
> Shankara