linux-kernel - [syzbot] [mm?] WARNING in blkdev_common

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Message-ID: <693b4abb.a70a0220.33cd7b.003a.GAE@google.com>
Date: Thu, 11 Dec 2025 14:50:35 -0800
From: syzbot <syzbot+660d079d90f8a1baf54d@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, apopple@...dia.com, byungchul@...com, 
	david@...nel.org, gourry@...rry.net, joshua.hahnjy@...il.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, matthew.brost@...el.com, 
	rakie.kim@...com, syzkaller-bugs@...glegroups.com, 
	ying.huang@...ux.alibaba.com, ziy@...dia.com
Subject: [syzbot] [mm?] WARNING in blkdev_common_ioctl

Hello,

syzbot found the following issue on:

HEAD commit:    cb015814f8b6 Merge tag 'f2fs-for-6.19-rc1' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17215992580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4ba13acbacc6118f
dashboard link: https://syzkaller.appspot.com/bug?extid=660d079d90f8a1baf54d
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=14d49a1a580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=100e2a1a580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fe039b381b1b/disk-cb015814.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/499efdc87215/vmlinux-cb015814.xz
kernel image: https://storage.googleapis.com/syzbot-assets/515c65eb7e89/bzImage-cb015814.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+660d079d90f8a1baf54d@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: mm/page_alloc.c:5186 at __alloc_frozen_pages_noprof+0x309/0x2430 mm/page_alloc.c:5186, CPU#1: syz.0.17/6010
Modules linked in:
CPU: 1 UID: 0 PID: 6010 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__alloc_frozen_pages_noprof+0x309/0x2430 mm/page_alloc.c:5186
Code: f0 5b 5d 41 5c 41 5d 41 5e 41 5f e9 d1 42 5e 09 83 fe 0a 0f 86 0c fe ff ff 80 3d 84 7b 57 0e 00 75 0b c6 05 7b 7b 57 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:ffffc9000414f888 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000017 RDI: 0000000000040dc0
RBP: 0000000000000017 R08: 0000000000000005 R09: 0000000000000009
R10: 0000000000000017 R11: ffff88802ffe4830 R12: 0000000000040dc0
R13: 1ffff92000829f27 R14: ffffffff9ac29ac4 R15: 0000000000000017
FS:  0000555575978500(0000) GS:ffff888124a0e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 000000007b864000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 ___kmalloc_large_node+0x10c/0x150 mm/slub.c:5593
 __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:5624
 __do_kmalloc_node mm/slub.c:5640 [inline]
 __kmalloc_noprof.cold+0xc/0x62 mm/slub.c:5664
 kmalloc_noprof include/linux/slab.h:961 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 blkdev_pr_read_keys block/ioctl.c:449 [inline]
 blkdev_common_ioctl+0x1f72/0x2b60 block/ioctl.c:729
 blkdev_ioctl+0x2b5/0x6e0 block/ioctl.c:785
 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/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c89d8f7c9
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:00007fffde61cdd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6c89fe5fa0 RCX: 00007f6c89d8f7c9
RDX: 0000000000000000 RSI: 00000000c01070ce RDI: 0000000000000003
RBP: 00007f6c89e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c89fe5fa0 R14: 00007f6c89fe5fa0 R15: 0000000000000003
 </TASK>


---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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