kernel panic: stack is corrupted in pointer

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    1438cde7 Add linux-next specific files for 20190716
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13988058600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3430a151e1452331
dashboard link: https://syzkaller.appspot.com/bug?extid=79f5f028005a77ecb6bb
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=111fc8afa00000

The bug was bisected to:

commit 96a5d8d4915f3e241ebb48d5decdd110ab9c7dcf
Author: Leo Liu <leo.liu@xxxxxxx>
Date:   Fri Jul 13 15:26:28 2018 +0000

    drm/amdgpu: Make sure IB tests flushed after IP resume

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14a46200600000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16a46200600000
console output: https://syzkaller.appspot.com/x/log.txt?x=12a46200600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+79f5f028005a77ecb6bb@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 96a5d8d4915f ("drm/amdgpu: Make sure IB tests flushed after IP  
resume")

Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in:  
pointer+0x702/0x750 lib/vsprintf.c:2187
Shutting down cpus with NMI
Kernel Offset: disabled


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