------------[ cut here ]------------
WARNING: CPU: 1 PID: 30157 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: 30157 Comm: syz-executor.2 Not tainted 5.9.0-rc7-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 fd ac e7 fc 48 8d bd 30 02 00 00 e8 51 41 cc fc 48 89 ef e8 c9 13 a4 ff 48 89 ef 5d e9 60 0a 28 fd e8 db ac e7 fc <0f> 0b eb a8 e8 d2 ac e7 fc 0f 0b eb cc e8 e9 82 28 fd eb bb e8 e2
RSP: 0018:ffffc900074b7c08 EFLAGS: 00010216
RAX: 0000000000000128 RBX: ffffffff848e9130 RCX: ffffc9000c927000
RDX: 0000000000040000 RSI: ffffffff848e91b5 RDI: ffff888041a7dac0
RBP: ffff888041a7d800 R08: 0000000000000001 R09: ffff888041a7d803
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a1328c28
R13: ffff888041a7d808 R14: ffff888041a7d928 R15: ffff8880a2f8d800
 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:165 [inline]
 exit_to_user_mode_prepare+0x1e1/0x200 kernel/entry/common.c:192
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:267
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45dd99
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:00007fc266e94c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000002040 RCX: 000000000045dd99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000118bf50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe16f45bdf R14: 00007fc266e959c0 R15: 000000000118bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..