------------[ cut here ]------------
!RB_EMPTY_ROOT(&prime_fpriv->dmabufs)
WARNING: drivers/gpu/drm/drm_prime.c:224 at drm_prime_destroy_file_private+0x4b/0x60, CPU#1: syz.5.36299/13287
Modules linked in:
CPU: 1 UID: 0 PID: 13287 Comm: syz.5.36299 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:drm_prime_destroy_file_private+0x4b/0x60
Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 2d ca c6 fc 48 83 3b 00 75 0c e8 82 8c 5b fc 5b e9 4c 83 41 06 cc e8 76 8c 5b fc 90 <0f> 0b 90 5b e9 3c 83 41 06 cc 66 66 2e 0f 1f 84 00 00 00 00 00 90
RSP: 0018:ffffc900078c7c40 EFLAGS: 00010293
RAX: ffffffff856a355a RBX: ffff8881bbf903b0 RCX: ffff888174039d80
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881bbf90328
RBP: ffff8881bbf90278 R08: ffffc900078c7bc7 R09: 1ffff92000f18f78
R10: dffffc0000000000 R11: fffff52000f18f79 R12: dffffc0000000000
R13: dead000000000100 R14: 0000000000000000 R15: ffff8881bbf90288
FS:  000055556a4e3500(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32d1bff8 CR3: 0000000177b7e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 drm_file_free+0x7f1/0xa00
 drm_release+0x2de/0x3f0
 __fput+0x44f/0xa60
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xf3/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff8a39cdd9
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:00007ffcf9a5fa18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007eff8a617da0 RCX: 00007eff8a39cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007eff8a617da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007eff8a617cb0 R11: 0000000000000246 R12: 00000000002c474b
R13: 00007eff8a61609c R14: 00000000002c44f9 R15: 00007eff8a616090
 </TASK>
