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SubjectRe: INFO: rcu detected stall in new_sync_read
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On 2020/01/07 5:54, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    bed72351 Merge tag 'kbuild-fixes-v5.5-2' of git://git.kern..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1747aec6e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=874bac2ff63646fa
> dashboard link: https://syzkaller.appspot.com/bug?extid=8a95855c8a4649d98244
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11c26859e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1307e6b9e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+8a95855c8a4649d98244@syzkaller.appspotmail.com
>

Dmitry, this looks like yet another stall report doing sched_setattr(SCHED_RR)
followed by sendfile()/fallocate() etc...

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