WARNING in udmabuf_create

Status: upstream: reported syz repro on 2026/08/09 19:14
Subsystems: media dri
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+bfeed181d1ce9ec87a8f@syzkaller.appspotmail.com
First crash: 2d12h, last: 9h31m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
f6f2741e assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in udmabuf_create 2026/08/10 00:11 2026/08/10 00:11 2026/08/10 00:29 5d63f80b
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [media?] [dri?] WARNING in udmabuf_create 0 (1) 2026/08/09 19:14

Sample crash report:
------------[ cut here ]------------
!(flags & __GFP_NOWARN)
WARNING: mm/slub.c:7013 at __kvmalloc_node_noprof+0x792/0x820 mm/slub.c:7013, CPU#0: syz.0.17/5812
Modules linked in:
CPU: 0 UID: 0 PID: 5812 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__kvmalloc_node_noprof+0x792/0x820 mm/slub.c:7013
Code: ff 48 c7 c7 70 f7 c8 8e 48 89 de e8 a8 3d eb 02 e9 1f fc ff ff 48 c7 c7 b0 f7 c8 8e 48 89 de e8 94 3d eb 02 e9 50 fc ff ff 90 <0f> 0b 90 31 db e9 08 fe ff ff 90 0f 0b 90 e9 57 ff ff ff 49 83 7f
RSP: 0018:ffffc90003957ae0 EFLAGS: 00010246
RAX: 0000000000000100 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000008000000000 RSI: ffffffff8c4c7660 RDI: ffffffff8c4c7620
RBP: 00000000ffffffff R08: 00000000000028c0 R09: 00000000ffffffff
R10: 0000000000000006 R11: 0000000000000000 R12: 0000008000000000
R13: 00000000000028c0 R14: 0000001000000000 R15: ffffffff865110fc
FS:  000055558d9eb500(0000) GS:ffff888124f0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5a9ae70000 CR3: 00000000730e6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 init_udmabuf drivers/dma-buf/udmabuf.c:193 [inline]
 udmabuf_create+0x2dc/0xf50 drivers/dma-buf/udmabuf.c:386
 udmabuf_ioctl_create drivers/dma-buf/udmabuf.c:465 [inline]
 udmabuf_ioctl+0x1f3/0x300 drivers/dma-buf/udmabuf.c:496
 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:61 [inline]
 do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a9af9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd717ddb68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5a9b225fa0 RCX: 00007f5a9af9e0d9
RDX: 0000200000000000 RSI: 0000000040187542 RDI: 0000000000000003
RBP: 00007f5a9b035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a9b225fac R14: 00007f5a9b225fa0 R15: 00007f5a9b225fa0
 </TASK>

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/10 04:23 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/10 00:28 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 18:07 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 09:42 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 05:59 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 05:34 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/10 03:17 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 23:13 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 17:12 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 08:42 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 05:02 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/09 05:02 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
2026/08/08 00:56 linux-next ea2bff00da89 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in udmabuf_create
* Struck through repros no longer work on HEAD.