linux-kernel - [syzbot] [media?] [dri?] WARNING in dma_buf

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Message-ID: <6933849f.a70a0220.243dc6.0026.GAE@google.com>
Date: Fri, 05 Dec 2025 17:19:27 -0800
From: syzbot <syzbot+4317d7108e14e5d56308@...kaller.appspotmail.com>
To: christian.koenig@....com, dri-devel@...ts.freedesktop.org, 
	linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org, 
	linux-media@...r.kernel.org, sumit.semwal@...aro.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [media?] [dri?] WARNING in dma_buf_vmap

Hello,

syzbot found the following issue on:

HEAD commit:    1d18101a644e Merge tag 'kernel-6.19-rc1.cred' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13fba192580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a1db0fea040c2a9f
dashboard link: https://syzkaller.appspot.com/bug?extid=4317d7108e14e5d56308
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1055e2b4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ddf484580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-1d18101a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/98f78b52cccd/vmlinux-1d18101a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7a8898061bfb/bzImage-1d18101a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4317d7108e14e5d56308@...kaller.appspotmail.com

Total swap = 124996kB
393083 pages RAM
0 pages HighMem/MovableOnly
184478 pages reserved
0 pages cma reserved
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5488 at drivers/dma-buf/dma-buf.c:1536 dma_buf_vmap+0x306/0x3b0 drivers/dma-buf/dma-buf.c:1536
Modules linked in:
CPU: 0 UID: 0 PID: 5488 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:dma_buf_vmap+0x306/0x3b0 drivers/dma-buf/dma-buf.c:1536
Code: 64 05 cc e8 0c 99 d7 fb 90 0f 0b 90 b8 ea ff ff ff eb bc e8 fc 98 d7 fb 90 0f 0b 90 e9 0d fe ff ff e8 ee 98 d7 fb 44 89 f0 90 <0f> 0b 90 49 bd 00 00 00 00 00 fc ff df eb 91 e8 c6 9c 61 05 48 c7
RSP: 0018:ffffc90002bbf3a0 EFLAGS: 00010293
RAX: 00000000fffffff4 RBX: ffff888000e02428 RCX: ffff888000eb4900
RDX: 0000000000000000 RSI: 00000000fffffff4 RDI: 0000000000000000
RBP: ffffc90002bbf450 R08: ffffc90002bbf227 R09: 1ffff92000577e44
R10: dffffc0000000000 R11: fffff52000577e45 R12: ffffffff85ea4500
R13: ffff888000e02430 R14: 00000000fffffff4 R15: 1ffff110001c0485
FS:  0000555591ecc500(0000) GS:ffff88808d722000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055859af10a08 CR3: 00000000589bb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 drm_gem_shmem_vmap_locked+0x14c/0x790 drivers/gpu/drm/drm_gem_shmem_helper.c:354
 drm_gem_vmap_locked drivers/gpu/drm/drm_gem.c:1279 [inline]
 drm_gem_vmap+0x10a/0x1d0 drivers/gpu/drm/drm_gem.c:1321
 drm_gem_fb_vmap+0xaa/0x8d0 drivers/gpu/drm/drm_gem_framebuffer_helper.c:368
 drm_atomic_helper_prepare_planes+0x2d6/0xb60 drivers/gpu/drm/drm_atomic_helper.c:2760
 drm_atomic_helper_commit+0x19a/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2189
 drm_atomic_commit+0x262/0x2c0 drivers/gpu/drm/drm_atomic.c:1577
 drm_atomic_helper_update_plane+0x248/0x3b0 drivers/gpu/drm/drm_atomic_helper.c:3348
 drm_mode_cursor_universal drivers/gpu/drm/drm_plane.c:1256 [inline]
 drm_mode_cursor_common+0xb7e/0x12d0 drivers/gpu/drm/drm_plane.c:1315
 drm_mode_cursor_ioctl+0xbf/0x110 drivers/gpu/drm/drm_plane.c:1365
 drm_ioctl_kernel+0x2cf/0x390 drivers/gpu/drm/drm_ioctl.c:797
 drm_ioctl+0x67f/0xb10 drivers/gpu/drm/drm_ioctl.c:894
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd9898f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007ffe37777948 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcd98be5fa0 RCX: 00007fcd9898f7c9
RDX: 0000200000000280 RSI: 00000000c01c64a3 RDI: 0000000000000003
RBP: 00007ffe377779a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fcd98be5fa0 R14: 00007fcd98be5fa0 R15: 0000000000000003
 </TASK>


---
This report is generated by a bot. It may contain errors.
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