------------[ cut here ]------------
WARNING: drivers/gpu/drm/drm_prime.c:224 at drm_prime_destroy_file_private+0x4b/0x60 drivers/gpu/drm/drm_prime.c:224, CPU#0: syz.0.0/5334
Modules linked in:
CPU: 0 UID: 0 PID: 5334 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~bpo12+1 04/01/2014
RIP: 0010:drm_prime_destroy_file_private+0x4b/0x60 drivers/gpu/drm/drm_prime.c:224
Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 6d 80 ed fc 48 83 3b 00 75 0c e8 82 d5 85 fc 5b e9 0c 40 23 06 cc e8 76 d5 85 fc 90 <0f> 0b 90 5b e9 fc 3f 23 06 cc 66 66 2e 0f 1f 84 00 00 00 00 00 90
RSP: 0018:ffffc9000b637a20 EFLAGS: 00010283
RAX: ffffffff853b2fda RBX: ffff888011006410 RCX: 0000000000100000
RDX: ffffc900217e3000 RSI: 0000000000000566 RDI: 0000000000000567
RBP: ffff8880110062c8 R08: ffffc9000b6379a7 R09: 1ffff920016c6f34
R10: dffffc0000000000 R11: fffff520016c6f35 R12: dffffc0000000000
R13: dead000000000100 R14: 0000000000000000 R15: ffff8880110062d8
FS:  00007ff8b73406c0(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005612179b7e30 CR3: 0000000012724000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 drm_file_free+0x7f2/0xa00 drivers/gpu/drm/drm_file.c:269
 drm_close_helper drivers/gpu/drm/drm_file.c:290 [inline]
 drm_release+0x2de/0x3f0 drivers/gpu/drm/drm_file.c:438
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 get_signal+0x11ec/0x1340 kernel/signal.c:2807
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8b658f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff8b7340038 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: fffffffffffffe00 RBX: 00007ff8b67e6090 RCX: 00007ff8b658f7c9
RDX: 00000000000000df RSI: 0000200000000780 RDI: 0000000000000007
RBP: 00007ff8b6613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8b67e6128 R14: 00007ff8b67e6090 R15: 00007ffc48b96fa8
 </TASK>