linux-kernel - [syzbot] [cgroups?] [mm?] WARNING in folio_lruvec

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <6853fc57.a00a0220.137b3.0009.GAE@google.com>
Date: Thu, 19 Jun 2025 05:02:31 -0700
From: syzbot <syzbot+a74a028d848147bc5931@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, cgroups@...r.kernel.org, hannes@...xchg.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...nel.org, 
	muchun.song@...ux.dev, roman.gushchin@...ux.dev, shakeel.butt@...ux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [cgroups?] [mm?] WARNING in folio_lruvec_lock

Hello,

syzbot found the following issue on:

HEAD commit:    bc6e0ba6c9ba Add linux-next specific files for 20250613
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1126090c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2f7a2e4d17ed458f
dashboard link: https://syzkaller.appspot.com/bug?extid=a74a028d848147bc5931
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2430bb0465cc/disk-bc6e0ba6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/436a39deef0a/vmlinux-bc6e0ba6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e314ca5b1eb3/bzImage-bc6e0ba6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a74a028d848147bc5931@...kaller.appspotmail.com

 handle_mm_fault+0x740/0x8e0 mm/memory.c:6397
 faultin_page mm/gup.c:1186 [inline]
 __get_user_pages+0x1aef/0x30b0 mm/gup.c:1488
 populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1922
 __mm_populate+0x24c/0x380 mm/gup.c:2025
 mm_populate include/linux/mm.h:3354 [inline]
 vm_mmap_pgoff+0x3f0/0x4c0 mm/util.c:584
 ksys_mmap_pgoff+0x587/0x760 mm/mmap.c:607
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page_owner free stack trace missing
------------[ cut here ]------------
WARNING: CPU: 0 PID: 38 at ./include/linux/memcontrol.h:732 folio_lruvec include/linux/memcontrol.h:732 [inline]
WARNING: CPU: 0 PID: 38 at ./include/linux/memcontrol.h:732 folio_lruvec_lock+0x150/0x1a0 mm/memcontrol.c:1211
Modules linked in:
CPU: 0 UID: 0 PID: 38 Comm: ksmd Not tainted 6.16.0-rc1-next-20250613-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:folio_lruvec include/linux/memcontrol.h:732 [inline]
RIP: 0010:folio_lruvec_lock+0x150/0x1a0 mm/memcontrol.c:1211
Code: 7c 25 00 00 74 08 4c 89 ff e8 7c 66 f8 ff 4d 89 2f eb c4 48 89 df 48 c7 c6 60 4f 98 8b e8 58 9b dc ff c6 05 01 85 5f 0d 01 90 <0f> 0b 90 e9 d5 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 4d
RSP: 0018:ffffc90000ae7660 EFLAGS: 00010046
RAX: b21d845e3554e000 RBX: ffffea0002108000 RCX: b21d845e3554e000
RDX: 0000000000000002 RSI: ffffffff8db792e4 RDI: ffff88801de83c00
RBP: ffffea0002108000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfaa14 R12: ffffea0002108000
R13: ffffea0002108008 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125c41000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f475c15ef98 CR3: 000000005f95a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __split_unmapped_folio+0x42e/0x2cb0 mm/huge_memory.c:3487
 __folio_split+0xf78/0x1300 mm/huge_memory.c:3891
 cmp_and_merge_page mm/ksm.c:2358 [inline]
 ksm_do_scan+0x499b/0x6530 mm/ksm.c:2665
 ksm_scan_thread+0x10b/0x4b0 mm/ksm.c:2687
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup