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R: Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu Subject: Re: [syzbot] [mm?] WARNING in set_mm_walk Message-Id: <20260810174852.aca0f73ab7ad71c70dcdefda@linux-foundation.org> In-Reply-To: <6a7a6929.b50370da.49fe0.005e.GAE@google.com> References: <6a7a6929.b50370da.49fe0.005e.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 67C4F100002 X-Stat-Signature: 5be57s788o97iwhggk6fag5ndcjct6ey X-Rspam-User: X-HE-Tag: 1786409334-860114 X-HE-Meta: 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 RgQ3NeQf 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 vlWCo6Ww bz+zaTR7ANTY0T1iprjrr9gkkkGO02Uk498cxXfpJAFIiqpOy7G0X/UCPd+q/6jO6U7H2WniZWj7phgq9cggdvPcA8/n9ZFuXg3d1+F6gb5VeHjpnUimFS2aAekqkY7jIeOWP9kffHz6cDIJxpMjherrGIJ5HLM0I+uleaWSV33rPM1JDyA6RU7GfotPKUsyraafn1qa6kSSCFaXBbcTcNIwGbXYf+VY Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 10 Aug 2026 17:13:29 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 562bfb501c54 Merge tag 'integrity-v7.2-rc7' of git://git.k.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=11a8cbb9580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 > dashboard link: https://syzkaller.appspot.com/bug?extid=12ee2725d5fde63a9c96 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Thanks. One for the MGLRU develoeprs, it seems. https://share.gemini.google/Wg4a5ns7E0LF might save a bit of time figuring this out. > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-562bfb50.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/9cbf6ef0490e/vmlinux-562bfb50.xz > kernel image: https://storage.googleapis.com/syzbot-assets/7ee52864c79a/bzImage-562bfb50.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+12ee2725d5fde63a9c96@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > current_is_kswapd() > WARNING: mm/vmscan.c:3800 at set_mm_walk+0x210/0x270 mm/vmscan.c:3800, CPU#1: kswapd0/110 > > Modules linked in: > CPU: 1 UID: 0 PID: 110 Comm: kswapd0 Tainted: G L syzkaller #0 PREEMPT(full) > Tainted: [L]=SOFTLOCKUP > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:set_mm_walk+0x210/0x270 mm/vmscan.c:3800 > Code: 13 00 00 4d 8d 7d 08 e9 f7 fe ff ff e8 79 f5 2a 00 e9 b7 fe ff ff e8 7f 6b ba ff 90 0f 0b 90 e9 d2 fe ff ff e8 71 6b ba ff 90 <0f> 0b 90 e9 74 ff ff ff 4c 89 ff e8 80 f5 2a 00 e9 4e fe ff ff 48 > RSP: 0018:ffffc900027772b8 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff888024934a80 RCX: ffffffff824ff8e8 > RDX: ffff888024934a80 RSI: ffffffff824ff96f RDI: ffff888024934a80 > RBP: 0000000000020000 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000020000 R11: 0000000000000000 R12: 0000000000000000 > R13: ffffc90002777c38 R14: 0000000000000001 R15: ffffc90002777c40 > FS: 0000000000000000(0000) GS:ffff8880d5ed8000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b31923ffc CR3: 0000000109695000 CR4: 0000000000352ef0 > DR0: 0000000000000005 DR1: 0000000000000005 DR2: 0000000020040004 > DR3: 0000000000000056 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Call Trace: > > try_to_inc_max_seq+0xf0/0x1090 mm/vmscan.c:4023 > try_to_shrink_lruvec+0x4bd/0x6b0 mm/vmscan.c:4977 > lru_gen_shrink_lruvec mm/vmscan.c:5128 [inline] > shrink_lruvec+0x31e/0x25b0 mm/vmscan.c:5888 > mem_cgroup_shrink_node+0x227/0x6a0 mm/vmscan.c:6753 > mem_cgroup_soft_reclaim mm/memcontrol-v1.c:312 [inline] > memcg1_soft_limit_reclaim+0x2d5/0x830 mm/memcontrol-v1.c:362 > balance_pgdat+0xa11/0x1f00 mm/vmscan.c:7177 > kswapd+0x556/0xb50 mm/vmscan.c:7462 > kthread+0x370/0x450 kernel/kthread.c:436 > ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > > > --- > 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@googlegroups.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