------------[ cut here ]------------
WARNING: CPU: 1 PID: 19186 at drivers/gpu/drm/vkms/vkms_gem.c:37 vkms_gem_free_object+0x85/0xa0 drivers/gpu/drm/vkms/vkms_gem.c:37
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 19186 Comm: syz-executor.4 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 panic+0x347/0x7c0 kernel/panic.c:231
 __warn.cold+0x20/0x46 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:vkms_gem_free_object+0x85/0xa0 drivers/gpu/drm/vkms/vkms_gem.c:37
Code: 00 75 2b e8 ed 1b 0d fd 48 8d bd 30 02 00 00 e8 81 10 f2 fc 48 89 ef e8 09 62 a5 ff 48 89 ef 5d e9 50 b8 4c fd e8 cb 1b 0d fd <0f> 0b eb a8 e8 c2 1b 0d fd 0f 0b eb cc e8 09 2e 4d fd eb bb e8 02
RSP: 0018:ffffc90008fdfc08 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffffff84672eb0 RCX: ffffffff840cb4a8
RDX: ffff8880454cc340 RSI: ffffffff84672f35 RDI: ffff888099c7d2c0
RBP: ffff888099c7d000 R08: 0000000000000001 R09: ffff888099c7d003
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a11b4c28
R13: ffff888099c7d008 R14: ffff888099c7d128 R15: ffff88809a9d1800
 drm_gem_object_free drivers/gpu/drm/drm_gem.c:990 [inline]
 kref_put include/linux/kref.h:65 [inline]
 __drm_gem_object_put include/drm/drm_gem.h:370 [inline]
 drm_gem_object_put include/drm/drm_gem.h:383 [inline]
 drm_gem_object_handle_put_unlocked+0x3ac/0x420 drivers/gpu/drm/drm_gem.c:238
 drm_gem_object_release_handle+0xf9/0x1b0 drivers/gpu/drm/drm_gem.c:260
 idr_for_each+0x113/0x220 lib/idr.c:208
 drm_gem_release+0x22/0x30 drivers/gpu/drm/drm_gem.c:947
 drm_file_free.part.0+0x866/0xcb0 drivers/gpu/drm/drm_file.c:282
 drm_file_free drivers/gpu/drm/drm_file.c:251 [inline]
 drm_close_helper.isra.0+0x17d/0x1f0 drivers/gpu/drm/drm_file.c:309
 drm_release+0x1e6/0x530 drivers/gpu/drm/drm_file.c:494
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:140 [inline]
 exit_to_user_mode_prepare+0x1e1/0x200 kernel/entry/common.c:167
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:242
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x416f01
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffe25ac7ea0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416f01
RDX: 0000000000000000 RSI: 000000000000106a RDI: 0000000000000003
RBP: 0000000000000001 R08: 00000000fce5b06a R09: 00000000fce5b06e
R10: 00007ffe25ac7f90 R11: 0000000000000293 R12: 0000000001190ab8
R13: 00000000000c9050 R14: ffffffffffffffff R15: 000000000118cf4c
Kernel Offset: disabled
Rebooting in 86400 seconds..