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SubjectRe: WARNING in idr_destroy
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syzbot has bisected this bug to:

commit 5b3709793d151e6e12eb6a38a5da3f7fc2923d3a
Author: Thomas Zimmermann <tzimmermann@suse.de>
Date: Wed May 8 08:26:19 2019 +0000

drm/ast: Convert AST driver to |struct drm_gem_vram_object|

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15a66fb5e00000
start commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=17a66fb5e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=13a66fb5e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
dashboard link: https://syzkaller.appspot.com/bug?extid=05835159fe322770fe3d
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e978e3e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b1a819e00000

Reported-by: syzbot+05835159fe322770fe3d@syzkaller.appspotmail.com
Fixes: 5b3709793d15 ("drm/ast: Convert AST driver to |struct drm_gem_vram_object|")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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