------------[ cut here ]------------
WARNING: CPU: 1 PID: 21051 at drivers/gpu/drm/vkms/vkms_gem.c:37 vkms_gem_free_object+0x92/0xb0 drivers/gpu/drm/vkms/vkms_gem.c:37
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 21051 Comm: syz-executor.3 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x3e kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:vkms_gem_free_object+0x92/0xb0 drivers/gpu/drm/vkms/vkms_gem.c:37
Code: 54 cf 18 fd 49 8d bc 24 00 02 00 00 e8 b7 a2 fd fc 4c 89 e7 e8 ef c1 aa ff 4c 89 e7 e8 47 3e 56 fd 41 5c 5d c3 e8 2e cf 18 fd <0f> 0b eb a2 e8 25 cf 18 fd 0f 0b eb c8 e8 9c 8d 56 fd eb b6 e8 95
RSP: 0018:ffffc90009577b40 EFLAGS: 00010293
RAX: ffff8880511f9ec0 RBX: ffffffff89fe1bc0 RCX: ffffffff8406ed17
RDX: 0000000000000000 RSI: ffffffff845c2662 RDI: ffff888022e54280
RBP: ffffc90009577b48 R08: ffff8880511f9ec0 R09: ffffed10045ca801
R10: ffffed10045ca800 R11: ffff888022e54003 R12: ffff888022e54000
R13: ffff888076ea0000 R14: ffffffff845c25d0 R15: ffff888076ea0020
 drm_gem_object_free+0x100/0x220 drivers/gpu/drm/drm_gem.c:983
 kref_put include/linux/kref.h:65 [inline]
 drm_gem_object_put_unlocked drivers/gpu/drm/drm_gem.c:1017 [inline]
 drm_gem_object_put_unlocked+0x196/0x1c0 drivers/gpu/drm/drm_gem.c:1002
 drm_gem_object_handle_put_unlocked+0x1ad/0x2d0 drivers/gpu/drm/drm_gem.c:239
 drm_gem_object_release_handle+0x102/0x1c0 drivers/gpu/drm/drm_gem.c:261
 idr_for_each+0x138/0x250 lib/idr.c:208
 drm_gem_release+0x27/0x40 drivers/gpu/drm/drm_gem.c:939
 drm_file_free.part.0+0x7f4/0xc00 drivers/gpu/drm/drm_file.c:244
 drm_file_free drivers/gpu/drm/drm_file.c:213 [inline]
 drm_close_helper drivers/gpu/drm/drm_file.c:271 [inline]
 drm_release+0x286/0x3f0 drivers/gpu/drm/drm_file.c:443
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x414601
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 84 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:00007fff563cb050 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000000000000000c RCX: 0000000000414601
RDX: 0000000000000000 RSI: 000000000000146e RDI: 000000000000000b
RBP: 0000000000000001 R08: 00000000e6e0146e R09: 00000000e6e01472
R10: 00007fff563cb180 R11: 0000000000000293 R12: 000000000072c980
R13: 000000000072c980 R14: 0000000000731540 R15: 00007fff563cb160
Kernel Offset: disabled
Rebooting in 86400 seconds..