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Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:966 at drm_mm_takedown+0x54/0x70 drivers/gpu/drm/drm_mm.c:965, CPU#0: syz.0.0/5318
Modules linked in:
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x54/0x70 drivers/gpu/drm/drm_mm.c:965
Code: 4c 89 f7 e8 4e 1c a1 fc 49 8b 06 4c 39 f0 75 0e e8 a1 7a 2f fc 5b 41 5e e9 19 45 53 06 cc e8 93 7a 2f fc 48 8d 3d 9c b0 ed 0a <67> 48 0f b9 3a 48 89 df 5b 41 5e eb 1f 66 66 66 66 66 66 2e 0f 1f
RSP: 0018:ffffc9000e03fc58 EFLAGS: 00010293
RAX: ffffffff8598a50d RBX: ffff888034f65468 RCX: ffff88803f6a0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff908655b0
RBP: ffffffff85975420 R08: ffff88801facfd80 R09: ffffffff8c8116c0
R10: dffffc0000000000 R11: ffffffff85975420 R12: ffff88801facfd80
R13: dffffc0000000000 R14: ffff888034f654a0 R15: dffffc0000000000
FS:  0000555586874540(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6659b909c0 CR3: 000000001fae7000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 drm_managed_release+0x208/0x380 drivers/gpu/drm/drm_managed.c:75
 drm_dev_release drivers/gpu/drm/drm_drv.c:924 [inline]
 kref_put include/linux/kref.h:65 [inline]
 drm_dev_put+0xe0/0x120 drivers/gpu/drm/drm_drv.c:958
 drm_release+0x3ab/0x400 drivers/gpu/drm/drm_file.c:446
 __fput+0x418/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff68679e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd81bcd9e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ff686a27da0 RCX: 00007ff68679e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ff686a27da0 R08: 00007ff686a26038 R09: 0000000000000000
R10: 0000000000ddebe4 R11: 0000000000000246 R12: 000000000001ab36
R13: 00007ff686a2609c R14: 000000000001a882 R15: 00007ff686a26090
 </TASK>
----------------
Code disassembly (best guess):
   0:	4c 89 f7             	mov    %r14,%rdi
   3:	e8 4e 1c a1 fc       	call   0xfca11c56
   8:	49 8b 06             	mov    (%r14),%rax
   b:	4c 39 f0             	cmp    %r14,%rax
   e:	75 0e                	jne    0x1e
  10:	e8 a1 7a 2f fc       	call   0xfc2f7ab6
  15:	5b                   	pop    %rbx
  16:	41 5e                	pop    %r14
  18:	e9 19 45 53 06       	jmp    0x6534536
  1d:	cc                   	int3
  1e:	e8 93 7a 2f fc       	call   0xfc2f7ab6
  23:	48 8d 3d 9c b0 ed 0a 	lea    0xaedb09c(%rip),%rdi        # 0xaedb0c6
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 89 df             	mov    %rbx,%rdi
  32:	5b                   	pop    %rbx
  33:	41 5e                	pop    %r14
  35:	eb 1f                	jmp    0x56
  37:	66                   	data16
  38:	66                   	data16
  39:	66                   	data16
  3a:	66                   	data16
  3b:	66                   	data16
  3c:	66                   	data16
  3d:	2e                   	cs
  3e:	0f                   	.byte 0xf
  3f:	1f                   	(bad)