------------[ cut here ]------------ WARNING: CPU: 0 PID: 16624 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: 16624 Comm: syz-executor.0 Not tainted 5.9.0-rc6-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 dd ba e7 fc 48 8d bd 30 02 00 00 e8 31 4f cc fc 48 89 ef e8 c9 13 a4 ff 48 89 ef 5d e9 90 15 28 fd e8 bb ba e7 fc <0f> 0b eb a8 e8 b2 ba e7 fc 0f 0b eb cc e8 19 8e 28 fd eb bb e8 12 RSP: 0018:ffffc9001701fc08 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffffff848e8300 RCX: ffffffff8432bab8 RDX: ffff88804881e000 RSI: ffffffff848e8385 RDI: ffff88809a439ac0 RBP: ffff88809a439800 R08: 0000000000000001 R09: ffff88809a439803 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a139cc28 R13: ffff88809a439808 R14: ffff88809a439928 R15: ffff88808e158000 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: 0033:0x417901 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 1a 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:00007fffe1d657b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000417901 RDX: 0000000000000000 RSI: 000000000000029c RDI: 0000000000000004 RBP: 0000000000000001 R08: 000000008d8a229c R09: 000000008d8a22a0 R10: 00007fffe1d658a0 R11: 0000000000000293 R12: 0000000001191298 R13: 000000000006fba7 R14: ffffffffffffffff R15: 000000000118cf4c Kernel Offset: disabled Rebooting in 86400 seconds..