------------[ cut here ]------------ WARNING: CPU: 0 PID: 13115 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: 13115 Comm: syz-executor.5 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:ffffc900185f7bb0 EFLAGS: 00010212 RAX: 0000000000008463 RBX: ffffffff848ed200 RCX: ffffc9001334e000 RDX: 0000000000040000 RSI: ffffffff848ed285 RDI: ffff88809f310ac0 RBP: ffff88809f310800 R08: 0000000000000001 R09: ffff88809f310803 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a1930c28 R13: ffff88809f310808 R14: ffff88809f310928 R15: ffff8880a779e000 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 drm_compat_ioctl+0x270/0x330 drivers/gpu/drm/drm_ioc32.c:988 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:842 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fb8549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f55b20cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000040086409 RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..