------------[ cut here ]------------
WARNING: CPU: 0 PID: 9300 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: 0 PID: 9300 Comm: syz-executor.4 Not tainted 5.9.0-rc8-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+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b 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 ad 6c e7 fc 48 8d bd 30 02 00 00 e8 01 01 cc fc 48 89 ef e8 f9 13 a4 ff 48 89 ef 5d e9 b0 cc 27 fd e8 8b 6c e7 fc <0f> 0b eb a8 e8 82 6c e7 fc 0f 0b eb cc e8 39 45 28 fd eb bb e8 32
RSP: 0018:ffffc9001892fc18 EFLAGS: 00010212
RAX: 000000000000a286 RBX: ffffffff848ed200 RCX: ffffc9001175d000
RDX: 0000000000040000 RSI: ffffffff848ed285 RDI: ffff8880a13ec2c0
RBP: ffff8880a13ec000 R08: 0000000000000001 R09: ffff8880a13ec003
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888218384c28
R13: ffff8880a13ec008 R14: ffff8880a13ec128 R15: ffff888090a46000
 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
 drm_gem_handle_delete+0x75/0xb0 drivers/gpu/drm/drm_gem.c:288
 drm_gem_close_ioctl+0xd6/0x120 drivers/gpu/drm/drm_gem.c:820
 drm_ioctl_kernel+0x220/0x2e0 drivers/gpu/drm/drm_ioctl.c:787
 drm_ioctl+0x4fd/0x9a2 drivers/gpu/drm/drm_ioctl.c:887
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45de59
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbe9bf40c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000b4c0 RCX: 000000000045de59
RDX: 0000000020000100 RSI: 0000000040086409 RDI: 0000000000000006
RBP: 000000000118c008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4
R13: 000000000169fb7f R14: 00007fbe9bf419c0 R15: 000000000118bfd4
Kernel Offset: disabled
Rebooting in 86400 seconds..