upstream build error (9)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 76ccd234 Merge branch 'perf-urgent-for-linus' of git://git..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=27bbeba43f06f835
dashboard link: https://syzkaller.appspot.com/bug?extid=cfc21ef9f8637dfa50f9
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+cfc21e...@syzkaller.appspotmail.com

timedout ["make" "oldconfig" "CC=/syzkaller/gcc/bin/gcc" "-j96"]

---
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See https://goo.gl/tpsmEJ for more information about syzbot.
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[Dmitry Vyukov]

#syz invalid

nested virt again kills host on qemu instances...

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