[syzbot] [media?] [dri?] WARNING in udmabuf_create

[syzbot] [media?] [dri?] WARNING in udmabuf_create

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    6b8c8af514d7 Add linux-next specific files for 20260807
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10b34149580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6d343b54cc50df0f
dashboard link: https://syzkaller.appspot.com/bug?extid=bfeed181d1ce9ec87a8f
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11e8c079580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/71ff4edcb608/disk-6b8c8af5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1f5fa331d8f2/vmlinux-6b8c8af5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f993558ec63b/bzImage-6b8c8af5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bfeed181d1ce9ec87a8f@syzkaller.appspotmail.com

------------[ cut here ]------------
!(flags & __GFP_NOWARN)
WARNING: mm/slub.c:7013 at __kvmalloc_node_noprof+0x792/0x820 mm/slub.c:7013, CPU#1: syz.0.17/5840
Modules linked in:
CPU: 1 UID: 0 PID: 5840 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:ffffc900044ffae0 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:  0000555557138500(0000) GS:ffff88812500c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb692c70000 CR3: 0000000079676000 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: 0033:0x7fb692d9e0d9
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:00007ffc7e6eab08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb693025fa0 RCX: 00007fb692d9e0d9
RDX: 0000200000000200 RSI: 0000000040187542 RDI: 0000000000000003
RBP: 00007fb692e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb693025fac R14: 00007fb693025fa0 R15: 00007fb693025fa0
 </TASK>


---
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Re: [syzbot] [media?] [dri?] WARNING in udmabuf_create

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    73ae59e97596 Merge tag 'erofs-for-7.3-rc1-2' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12dff979580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8d423d3e91ba4f47
dashboard link: https://syzkaller.appspot.com/bug?extid=bfeed181d1ce9ec87a8f
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16d50d49580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11296979580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-73ae59e9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2edc303b5fba/vmlinux-73ae59e9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2624d8e0a8af/bzImage-73ae59e9.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bfeed181d1ce9ec87a8f@syzkaller.appspotmail.com

------------[ cut here ]------------
!(flags & __GFP_NOWARN)
WARNING: mm/slub.c:7013 at __kvmalloc_node_noprof+0x646/0x9b0 mm/slub.c:7013, CPU#2: syz.0.17/5920
Modules linked in:
CPU: 2 UID: 0 PID: 5920 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 04/01/2014
RIP: 0010:__kvmalloc_node_noprof+0x646/0x9b0 mm/slub.c:7013
Code: c1 e8 2e 07 ff ff 4d 85 f6 0f 85 b6 fd ff ff 48 81 fb ff ff ff 7f 0f 86 4d fd ff ff 41 81 e4 00 20 00 00 0f 85 9c fd ff ff 90 <0f> 0b 90 e9 93 fd ff ff 41 be 10 00 00 00 e9 88 fd ff ff be 42 01
RSP: 0018:ffffc90003d8fb50 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000008000800018 RCX: 0000010000000000
RDX: 0000000000000000 RSI: ffffffff8c61e200 RDI: ffffffff8e6ad930
RBP: 0000000008000800 R08: 00000000000028c0 R09: 00000000ffffffff
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000028c0 R14: 0000000000000000 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff888096b76000(0063) knlGS:00000000579e1480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7113140 CR3: 00000000542cb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 init_udmabuf drivers/dma-buf/udmabuf.c:193 [inline]
 udmabuf_create+0x2e8/0x12a0 drivers/dma-buf/udmabuf.c:386
 udmabuf_ioctl_create_list drivers/dma-buf/udmabuf.c:484 [inline]
 udmabuf_ioctl+0x2b2/0x300 drivers/dma-buf/udmabuf.c:499
 __do_compat_sys_ioctl fs/ioctl.c:695 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:638 [inline]
 __ia32_compat_sys_ioctl+0x2cf/0x360 fs/ioctl.c:638
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f03fec
Code: Unable to access opcode bytes at 0xf7f03fc2.
RSP: 002b:00000000ffe2d40c EFLAGS: 00000292 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000040087543
RDX: 0000000080000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.