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    SubjectRe: upstream build error (12)
    On Tue, 12 Jan 2021 at 21:32, Nathan Chancellor
    <natechancellor@gmail.com> wrote:
    >
    > On Tue, Jan 12, 2021 at 12:40:58PM -0700, Nathan Chancellor wrote:
    > > On Tue, Jan 12, 2021 at 11:20:27AM -0800, syzbot wrote:
    > > > Hello,
    > > >
    > > > syzbot found the following issue on:
    > > >
    > > > HEAD commit: e609571b Merge tag 'nfs-for-5.11-2' of git://git.linux-nfs..
    > > > git tree: upstream
    > > > console output: https://syzkaller.appspot.com/x/log.txt?x=15965a00d00000
    > > > kernel config: https://syzkaller.appspot.com/x/.config?x=6157970d0a91b812
    > > > dashboard link: https://syzkaller.appspot.com/bug?extid=76880518931d755473cf
    > > > compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
    > > >
    > > > IMPORTANT: if you fix the issue, please add the following tag to the commit:
    > > > Reported-by: syzbot+76880518931d755473cf@syzkaller.appspotmail.com
    > > >
    > > > clang-11: error: unable to execute command: Aborted (core dumped)
    > > > clang-11: error: clang frontend command failed due to signal (use -v to see invocation)
    > > >
    > > > ---
    > > > This report is generated by a bot. It may contain errors.
    > > > See https://goo.gl/tpsmEJ for more information about syzbot.
    > > > syzbot engineers can be reached at syzkaller@googlegroups.com.
    > > >
    > > > syzbot will keep track of this issue. See:
    > > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
    > >
    > > Would it be possible for clang-built-linux@googlegroups.com to be CC'd
    > > when there is a build error and the compiler is clang? Especially if
    > > clang is hitting an assertion.
    >
    > I cannot reproduce this with clang 11.0.1. I did a reverse bisect on
    > LLVM and found commit 4b0aa5724fea ("Change the INLINEASM_BR MachineInstr
    > to be a non-terminating instruction.") as the fix (which makes sense,
    > that commit has direct kernel implications). It is probably worth
    > upgrading syzkaller's clang to 11.0.1, where I have not seen any
    > assertions across all of the configurations that I test.
    >
    > Ccing Dmitry and Marco directly.

    I'll upgrade syzbot's clang 11. I think the version we use right now
    was still a pre-release.

    Thanks,
    -- Marco

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