BUG: executor-detected bug

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    30bac164aca7 Revert "Change mincore() to count "mapped" pa..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11888d5f400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=505743eba4e4f68
dashboard link: https://syzkaller.appspot.com/bug?extid=cea928fd1f13d3cbeee3
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11be4390c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+cea928fd1f13d3cbeee3@xxxxxxxxxxxxxxxxxxxxxxxxx

vice hsr_slave_0 left promiscuous mode
2019/01/24 16:52:39 executed programs: 197
2019/01/24 16:52:41 BUG: executor-detected bug:
child errored
loop errored
2019/01/24 16:52:41 result: failed=true hanged=false err=executor 0:  
detected kernel bug

child errored
loop errored
2019/01/24 16:52:44 executed programs: 225
2019/01/24 16:52:50 executed programs: 246


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