linux-kernel - [BUG] WARNING in drm_gem_object_handle_put_unlocked via drm

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Message-ID:
 <KL1PR03MB880038ED4D0899BEC73A1E24A185A@KL1PR03MB8800.apcprd03.prod.outlook.com>
Date: Thu, 8 Jan 2026 10:43:56 +0000
From: "WangzXD0325@...look.com" <WangzXD0325@...look.com>
To: "maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: [BUG] WARNING in drm_gem_object_handle_put_unlocked via drm_release

Hello DRM maintainers,

This is a WARNING bug detected by syzkaller.

1. Description
A kernel WARNING was triggered in drm_gem_object_handle_put_unlocked during the close() syscall on a DRM file descriptor. The issue appears to be related to GEM object handle management during the release process (drm_release).

According to the log, the warning is located at drivers/gpu/drm/drm_gem.c:300.

2. Environment
Kernel Branch: mainline
Kernel Revision: v6.18 
Kernel Config: https://gist.github.com/manual0/b8f4c12ea784620b3db92dbe56afedbb#file-gistfile1-txt
Compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0

3. Syzkaller Report
WARNING: CPU: 3 PID: 48617 at drivers/gpu/drm/drm_gem.c:300 drm_gem_object_handle_put_unlocked+0x30e/0x3e0
Modules linked in:
CPU: 3 UID: 0 PID: 48617 Comm: syz.3.11626 Not tainted 6.18.0 #1 PREEMPT(full) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
RIP: 0010:drm_gem_object_handle_put_unlocked+0x30e/0x3e0
Call Trace:
 <TASK>
 drm_gem_object_release_handle+0xc7/0x200
 idr_for_each+0x119/0x230 lib/idr.c:208
 drm_gem_release+0x29/0x40
 drm_file_free.part.0+0x724/0xcf0
 drm_close_helper.isra.0+0x183/0x1f0
 drm_release+0x1ab/0x360
 __fput+0x402/0xb50 fs/file_table.c:468
 task_work_run+0x16b/0x260 kernel/task_work.c:227
 exit_to_user_mode_loop+0xf9/0x130
 do_syscall_64+0x424/0xfa0 arch/x86/entry/syscall_32.c:308
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
 </TASK>

Best regards,
Zhi Wang