faux_driver vkms: [drm] Unknown color mode 7; guessing buffer size.
------------[ 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.0.0/5339
Modules linked in:
CPU: 0 UID: 0 PID: 5339 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 4d 18 ed fc 48 83 3b 00 75 0c e8 02 37 85 fc 5b e9 fc 11 24 06 cc e8 f6 36 85 fc 90 <0f> 0b 90 5b c3 cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90
RSP: 0018:ffffc9000ed7f860 EFLAGS: 00010293
RAX: ffffffff853c89aa RBX: ffff888044c32410 RCX: ffff88801c748000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888044c32380
RBP: ffff888044c322c8 R08: ffffc9000ed7f7e7 R09: 1ffff92001dafefc
R10: dffffc0000000000 R11: fffff52001dafefd R12: dffffc0000000000
R13: dead000000000100 R14: 0000000000000000 R15: ffff888044c322d8
FS:  0000000000000000(0000) GS:ffff88808d22a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dff017c660 CR3: 000000000df3a000 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
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6c5/0x2310 kernel/exit.c:971
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 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+0x87/0x4f0 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+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f408558f7c9
Code: Unable to access opcode bytes at 0x7f408558f79f.
RSP: 002b:00007f40819f5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f40857e5fa0 RCX: 00007f408558f7c9
RDX: 0000200000000000 RSI: 00000000c02064b2 RDI: 0000000000000005
RBP: 00007f4085613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f40857e6038 R14: 00007f40857e5fa0 R15: 00007ffe4cdcbca8
 </TASK>