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+cfc21ef9f8637dfa50f9@xxxxxxxxxxxxxxxxxxxxxxxxx

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

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