[syzbot] [mm?] WARNING in raw_alloc_io_data

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: dcb6fa37fd7b Linux 6.18-rc3
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=160597e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=609c87dcb0628493
dashboard link: https://syzkaller.appspot.com/bug?extid=a894fe5447d0543e89c9
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11af27e2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11c2d614580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dcb6fa37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/61176fd888a1/vmlinux-dcb6fa37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/84e7e9924c22/bzImage-dcb6fa37.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a894fe...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 3 PID: 6091 at mm/page_alloc.c:5159 __alloc_frozen_pages_noprof+0x309/0x2470 mm/page_alloc.c:5159
Modules linked in:
CPU: 3 UID: 0 PID: 6091 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:__alloc_frozen_pages_noprof+0x309/0x2470 mm/page_alloc.c:5159
Code: f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 83 fe 0a 0f 86 0c fe ff ff 80 3d d4 63 52 0e 00 75 0b c6 05 cb 63 52 0e 01 90 <0f> 0b 90 45 31 f6 eb 81 4d 85 f6 74 22 44 89 fa 89 ee 4c 89 f7 e8
RSP: 0018:ffffc9000371f9f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000014 RDI: 0000000000040cc0
RBP: 0000000000000014 R08: 0000000000000005 R09: 0000000000000009
R10: 0000000000000014 R11: 0000000000000001 R12: 0000000000040cc0
R13: 1ffff920006e3f55 R14: ffffffff9ab2c464 R15: 0000000000000014
FS: 000055557bf92500(0000) GS:ffff8880d6d0a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84d9710300 CR3: 0000000032452000 CR4: 0000000000352ef0
Call Trace:
<TASK>
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
___kmalloc_large_node+0xed/0x160 mm/slub.c:5583
__kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:5614
__do_kmalloc_node mm/slub.c:5630 [inline]
__kmalloc_noprof.cold+0xc/0x62 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
raw_alloc_io_data drivers/usb/gadget/legacy/raw_gadget.c:673 [inline]
raw_alloc_io_data+0x12c/0x1a0 drivers/usb/gadget/legacy/raw_gadget.c:659
raw_ioctl_ep0_read drivers/usb/gadget/legacy/raw_gadget.c:776 [inline]
raw_ioctl+0x1397/0x2c30 drivers/usb/gadget/legacy/raw_gadget.c:1313
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f84d938efc9
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:00007ffe768729f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f84d95e5fa0 RCX: 00007f84d938efc9
RDX: 0000200000000080 RSI: 00000000c0085504 RDI: 0000000000000006
RBP: 00007f84d9411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f84d95e5fa0 R14: 00007f84d95e5fa0 R15: 0000000000000003
</TASK>


---
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[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+a894fe...@syzkaller.appspotmail.com
Tested-by: syzbot+a894fe...@syzkaller.appspotmail.com

Tested on:

commit: fd575722 Merge tag 'sched_ext-for-6.18-rc3-fixes' of g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1077d614580000

kernel config: https://syzkaller.appspot.com/x/.config?x=609c87dcb0628493
dashboard link: https://syzkaller.appspot.com/bug?extid=a894fe5447d0543e89c9
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=127b9e7c580000

Note: testing is done by a robot and is best-effort only.

[Gopi Krishna Menon]

#syz dup: [syzbot] [mm?] WARNING in raw_ioctl

[Gopi Krishna Menon]

On Mon, Oct 27, 2025 at 02:18:32PM -0700, syzbot wrote:

#syz test