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

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Message-ID: <c5b4b7b2-fc78-7bb0-7c3a-8f31c24028e6@i-love.sakura.ne.jp>
Date:   Sun, 20 Jan 2019 10:48:38 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+cfa5d826b19395f1940e@...kaller.appspotmail.com>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.com>
Cc:     hirofumi@...l.parknet.co.jp, LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: INFO: task hung in fat_fallocate

On 2019/01/20 4:03, Dmitry Vyukov wrote:
> On Sun, Apr 29, 2018 at 7:03 PM syzbot
> <syzbot+cfa5d826b19395f1940e@...kaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot hit the following crash on upstream commit
>> bf8f5de17442bba5f811e7e724980730e079ee11 (Sat Apr 28 17:05:04 2018 +0000)
>> MAINTAINERS: add myself as maintainer of AFFS
>> syzbot dashboard link:
>> https://syzkaller.appspot.com/bug?extid=cfa5d826b19395f1940e
>>
>> Unfortunately, I don't have any reproducer for this crash yet.
>> Raw console output:
>> https://syzkaller.appspot.com/x/log.txt?id=5087555854794752
>> Kernel config:
>> https://syzkaller.appspot.com/x/.config?id=7043958930931867332
>> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> 
> This mentions __getblk_gfp. Is it the same as "INFO: task hung in
> generic_file_write_iter":
> https://syzkaller.appspot.com/bug?id=b3c7e1440aa8ece16bf557dbac427fdff1dad9d6
> and fixed with "blockdev: Fix livelocks on loop device"?

Yes, I think so.

#syz dup: INFO: task hung in generic_file_write_iter