------------[ cut here ]------------ WARNING: CPU: 0 PID: 26311 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: 26311 Comm: syz-executor.0 Not tainted 5.9.0-rc2-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 ad 1c 0d fd 48 8d bd 30 02 00 00 e8 41 11 f2 fc 48 89 ef e8 09 62 a5 ff 48 89 ef 5d e9 10 b9 4c fd e8 8b 1c 0d fd <0f> 0b eb a8 e8 82 1c 0d fd 0f 0b eb cc e8 c9 2e 4d fd eb bb e8 c2 RSP: 0018:ffffc90018a7fc08 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffffff84672df0 RCX: ffffffff840cb3e8 RDX: ffff8880a8586080 RSI: ffffffff84672e75 RDI: ffff88801c1842c0 RBP: ffff88801c184000 R08: 0000000000000001 R09: ffff88801c184003 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a1114c28 R13: ffff88801c184008 R14: ffff88801c184128 R15: ffff888046120800 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:000000000169fbe0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000416f01 RDX: 0000000000000000 RSI: 00000000000006fc RDI: 0000000000000004 RBP: 0000000000000001 R08: 000000005bd986fc R09: 000000005bd98700 R10: 000000000169fcd0 R11: 0000000000000293 R12: 00000000011913f8 R13: 00000000000d5bc4 R14: ffffffffffffffff R15: 000000000118cf4c Kernel Offset: disabled Rebooting in 86400 seconds..