------------[ cut here ]------------
WARNING: drivers/gpu/drm/drm_prime.c:224 at drm_prime_destroy_file_private+0x43/0x60 drivers/gpu/drm/drm_prime.c:224, CPU#3: syz.8.4434/21171
Modules linked in:
CPU: 3 UID: 0 PID: 21171 Comm: syz.8.4434 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0x43/0x60 drivers/gpu/drm/drm_prime.c:224
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 21 48 8b 83 90 00 00 00 48 85 c0 75 06 5b e9 d3 47 6c fc e8 ce 47 6c fc 90 <0f> 0b 90 5b e9 c4 47 6c fc e8 7f 1d d6 fc eb d8 66 66 2e 0f 1f 84
RSP: 0018:ffffc90005e0fbf0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888056a69380 RCX: ffffffff8b7955d1
RDX: ffff888056cd24c0 RSI: ffffffff85529cb2 RDI: ffff888056a69410
RBP: ffff888056a69000 R08: 0000000000000001 R09: fffff52000bc1f5e
R10: ffffc90005e0faf7 R11: 0000000000000000 R12: ffff888027682000
R13: ffff888056a692b0 R14: 0000000000000000 R15: ffff888056a692d8
FS:  0000000000000000(0000) GS:ffff8880d6bf6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd4f37156c0 CR3: 000000000e184000 CR4: 0000000000352ef0
DR0: 0000000000000081 DR1: 0000000080000000 DR2: 0000000000000032
DR3: 7fffffffffffffff DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_file_free.part.0+0x7ee/0xcd0 drivers/gpu/drm/drm_file.c:269
 drm_file_free drivers/gpu/drm/drm_file.c:237 [inline]
 drm_close_helper.isra.0+0x186/0x1f0 drivers/gpu/drm/drm_file.c:290
 drm_release+0x1ab/0x360 drivers/gpu/drm/drm_file.c:438
 __fput+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x87f/0x2bd0 kernel/exit.c:971
 __do_sys_exit kernel/exit.c:1079 [inline]
 __se_sys_exit kernel/exit.c:1077 [inline]
 __x64_sys_exit+0x42/0x50 kernel/exit.c:1077
 x64_sys_call+0x1517/0x1740 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f26ab18f7c9
Code: Unable to access opcode bytes at 0x7f26ab18f79f.
RSP: 002b:00007f26ac064fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f26ab3e5fa0 RCX: 00007f26ab18f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f26ab213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f26ab3e6038 R14: 00007f26ab3e5fa0 R15: 00007ffe440c6ef8
 </TASK>