linux-kernel - [syzbot] WARNING in drm_gem_object_handle_put

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Message-ID: <6780cf97.ab6d.19b9b73b643.Coremail.wangzhi_xd@stu.xidian.edu.cn>
Date: Thu, 8 Jan 2026 10:33:30 +0800 (GMT+08:00)
From: 王志 <wangzhi_xd@....xidian.edu.cn>
To: linux-kernel@...r.kernel.org
Cc: syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING in drm_gem_object_handle_put_unlocked

syzbot has found the following issue on:

HEAD commit:    6.18.0-rcX
git tree:       linux-stable
console output: (see below)
kernel config:  (attached)

---

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
Code: ed 74 61 e8 74 a8 84 fc 4c 89 e7 e8 2c 9e 94 00 48 c7 c1 60 09 ea 8b 4c 89 ea 48 c7 c7 40 05 ea 8b 48 89 c6 e8 e3 3b 44 fc 90 <0f> 0b 90 90 5b 5d 41 5c 41 5d 41 5e 41 5f e9 3f a8 84 fc 4c 89 ff
RSP: 0018:ffffc90004fbfb80 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88802f740fe0 RCX: ffffffff8179ed09
RDX: ffff88802ae30000 RSI: ffffffff8179ed16 RDI: 0000000000000001
RBP: ffff888037e8a000 R08: 0000000000000001 R09: ffffed1026be4841
R10: 0000000000000001 R11: 00000000000150c8 R12: ffff88801c32e0c8
R13: ffff8881012afec0 R14: 0000000000000000 R15: ffff888037e8a004
FS:  000055558f177500(0000) GS:ffff8881a2701000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f83f9508fc8 CR3: 0000000125a9e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 drm_gem_object_release_handle+0xc7/0x200
 idr_for_each+0x119/0x230 home/wmy/Fuzzer/third_tool/linux-6.18/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 home/wmy/Fuzzer/third_tool/linux-6.18/fs/file_table.c:468
 task_work_run+0x16b/0x260 home/wmy/Fuzzer/third_tool/linux-6.18/kernel/task_work.c:227
 exit_to_user_mode_loop+0xf9/0x130
 do_syscall_64+0x424/0xfa0 home/wmy/Fuzzer/third_tool/linux-6.18/arch/x86/entry/syscall_32.c:308
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f83f85b059d
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc22ea25d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f83f8827da0 RCX: 00007f83f85b059d
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ffc22ea2678 R08: 0000001b2f8202d2 R09: 0000000000000000
R10: 0000001b2fc20000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 00007f83f882609c R14: 00007f83f8827da0 R15: 00007ffc22ea26a0
 </TASK>