[syzbot] [mm?] WARNING in lru_gen_clear_refs

[syzbot <syzbot+67a21f2b4c8e9e650adf@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    af2ea8ab7a54 Add linux-next specific files for 20241205
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1210e8df980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=76f158395f6f15fd
dashboard link: https://syzkaller.appspot.com/bug?extid=67a21f2b4c8e9e650adf
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=111050f8580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=136fade8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8af0861258fa/disk-af2ea8ab.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ffb38cf7a344/vmlinux-af2ea8ab.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6fbd2e50358a/bzImage-af2ea8ab.xz

The issue was bisected to:

commit 51ac493f56fa00b052be4fbc94ac91f057ebc2e7
Author: Yu Zhao <yuzhao@google.com>
Date:   Mon Dec 2 03:28:19 2024 +0000

    mm/mglru: optimize deactivation

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=141418df980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=161418df980000
console output: https://syzkaller.appspot.com/x/log.txt?x=121418df980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+67a21f2b4c8e9e650adf@syzkaller.appspotmail.com
Fixes: 51ac493f56fa ("mm/mglru: optimize deactivation")

 __kernel_write_iter+0x42a/0x940 fs/read_write.c:612
 __kernel_write fs/read_write.c:632 [inline]
 kernel_write+0x214/0x330 fs/read_write.c:653
 process_sysctl_arg+0x3f7/0x650 fs/proc/proc_sysctl.c:1683
 parse_one kernel/params.c:153 [inline]
 parse_args+0x623/0xdc0 kernel/params.c:186
 do_sysctl_args+0xeb/0x180 fs/proc/proc_sysctl.c:1715
 kernel_init+0x80/0x2b0 init/main.c:1489
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
page_owner free stack trace missing
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5828 at ./include/linux/memcontrol.h:730 folio_lruvec include/linux/memcontrol.h:730 [inline]
WARNING: CPU: 0 PID: 5828 at ./include/linux/memcontrol.h:730 lru_gen_clear_refs+0x498/0x520 mm/swap.c:410
Modules linked in:
CPU: 0 UID: 0 PID: 5828 Comm: syz-executor425 Not tainted 6.13.0-rc1-next-20241205-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:folio_lruvec include/linux/memcontrol.h:730 [inline]
RIP: 0010:lru_gen_clear_refs+0x498/0x520 mm/swap.c:410
Code: 66 ff ff ff e8 99 dc c2 ff e9 92 fe ff ff e8 8f dc c2 ff 4c 89 e7 48 c7 c6 20 c9 13 8c e8 20 95 0c 00 c6 05 4c 86 27 0e 01 90 <0f> 0b 90 e9 7b fc ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 43 fd
RSP: 0018:ffffc90003787460 EFLAGS: 00010246
RAX: dc5da43f42521400 RBX: 0000000000000000 RCX: ffffc90003787003
RDX: 0000000000000002 RSI: ffffffff8c0aa440 RDI: ffffffff8c5fbe80
RBP: ffffc90003787530 R08: ffffffff9019d9b7 R09: 1ffffffff2033b36
R10: dffffc0000000000 R11: fffffbfff2033b37 R12: ffffea00006a8000
R13: 1ffffd40000d5000 R14: 00fff00000000058 R15: 0000000000000000
FS:  0000555587a6b380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 000000007213e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 deactivate_file_folio+0x99/0x100 mm/swap.c:679
 mapping_try_invalidate+0x28b/0x550 mm/truncate.c:489
 drop_pagecache_sb+0x1ab/0x260 fs/drop_caches.c:40
 iterate_supers+0xc6/0x190 fs/super.c:934
 drop_caches_sysctl_handler+0x8c/0x160 fs/drop_caches.c:64
 proc_sys_call_handler+0x5ec/0x920 fs/proc/proc_sysctl.c:601
 do_iter_readv_writev+0x600/0x880
 vfs_writev+0x376/0xba0 fs/read_write.c:1050
 do_writev+0x1b6/0x360 fs/read_write.c:1096
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f625e20b329
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc4d77ac58 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007ffc4d77ae28 RCX: 00007f625e20b329
RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007f625e27e610 R08: 0000000000000000 R09: 00007ffc4d77ae28
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc4d77ae18 R14: 0000000000000001 R15: 0000000000000001
 </TASK>


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