------------[ cut here ]------------ WARNING: CPU: 1 PID: 11098 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: 11098 Comm: syz-executor.4 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+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x4a 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 cd 15 0d fd 48 8d bd 30 02 00 00 e8 51 12 f2 fc 48 89 ef e8 d9 63 a5 ff 48 89 ef 5d e9 30 b9 4c fd e8 ab 15 0d fd <0f> 0b eb a8 e8 a2 15 0d fd 0f 0b eb cc e8 29 2e 4d fd eb bb e8 22 RSP: 0018:ffffc900056d7c08 EFLAGS: 00010216 RAX: 0000000000000131 RBX: ffffffff846728e0 RCX: ffffc90011101000 RDX: 0000000000040000 RSI: ffffffff84672965 RDI: ffff888049427ac0 RBP: ffff888049427800 R08: 0000000000000001 R09: ffff888049427803 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a119cc28 R13: ffff888049427808 R14: ffff888049427928 R15: ffff888019af5800 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+0x195/0x1c0 kernel/entry/common.c:167 syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:242 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc91c91ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000007 RBX: 0000000000002a00 RCX: 000000000045d5b9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 000000000169fb6f R14: 00007fc91c91b9c0 R15: 000000000118cf4c Kernel Offset: disabled Rebooting in 86400 seconds..