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Tue, 09 Dec 2025 04:16:27 -0800 (PST) Date: Tue, 09 Dec 2025 04:16:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6938131b.050a0220.4004e.0007.GAE@google.com> Subject: [syzbot] [mm?] WARNING in shrink_lruvec From: syzbot To: akpm@linux-foundation.org, axelrasmussen@google.com, david@kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, mhocko@kernel.org, shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com, weixugc@google.com, yuanchu@google.com, zhengqi.arch@bytedance.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 8A94F2000A X-Rspamd-Server: rspam10 X-Stat-Signature: j7runax8zmki7so7u6mjqt5m1w1f8u5x X-HE-Tag: 1765282588-880645 X-HE-Meta: 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 u5njAUH/ 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 vCs9vd/G 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 2061f18ad76e Merge tag 'caps-pr-20251204' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=151cc41a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=879619bdbc37e7fc dashboard link: https://syzkaller.appspot.com/bug?extid=90fcab4d88cffed6d0d8 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5fcfff6f18cf/disk-2061f18a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/36b7247e87d2/vmlinux-2061f18a.xz kernel image: https://storage.googleapis.com/syzbot-assets/e2f1eee5ec54/bzImage-2061f18a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+90fcab4d88cffed6d0d8@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: mm/vmscan.c:5049 at lru_gen_shrink_lruvec mm/vmscan.c:5049 [inline], CPU#1: syz.0.6406/391 WARNING: mm/vmscan.c:5049 at shrink_lruvec+0x253b/0x2b50 mm/vmscan.c:5818, CPU#1: syz.0.6406/391 Modules linked in: CPU: 1 UID: 0 PID: 391 Comm: syz.0.6406 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lru_gen_shrink_lruvec mm/vmscan.c:5049 [inline] RIP: 0010:shrink_lruvec+0x253b/0x2b50 mm/vmscan.c:5818 Code: 89 de e8 78 78 bf ff 49 8d 46 34 48 89 44 24 38 84 db 0f 84 cf 00 00 00 31 ff b9 02 00 00 00 e9 42 df ff ff e8 06 7e bf ff 90 <0f> 0b 90 e9 45 dd ff ff 48 8b bc 24 98 00 00 00 e8 e0 90 27 00 e9 RSP: 0018:ffffc9000d5def60 EFLAGS: 00010283 RAX: 0000000000001170 RBX: ffffc9000d5df120 RCX: ffffc90014135000 RDX: 0000000000080000 RSI: ffffffff81fe1a6a RDI: 0000000000000001 RBP: ffffc9000d5df2e0 R08: 0000000000000001 R09: 0000000000000030 R10: 0000000000000020 R11: 00000000622d1f49 R12: 0000000000000020 R13: ffff88807cd00d40 R14: ffffc9000d5df628 R15: 1ffff92001abbe0a FS: 00007f36a7b6f6c0(0000) GS:ffff888124a67000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30008ff8 CR3: 000000005c3e2000 CR4: 00000000003526f0 Call Trace: shrink_node_memcgs mm/vmscan.c:6054 [inline] shrink_node+0x988/0x3da0 mm/vmscan.c:6095 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x362/0x1920 mm/vmscan.c:6401 try_to_free_mem_cgroup_pages+0x31b/0x740 mm/vmscan.c:6729 mem_cgroup_resize_max+0x113/0x2b0 mm/memcontrol-v1.c:1480 mem_cgroup_write+0x295/0x3a0 mm/memcontrol-v1.c:1662 cgroup_file_write+0x1ef/0x7a0 kernel/cgroup/cgroup.c:4312 kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352 iter_file_splice_write+0xa24/0x12b0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1161 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1230 do_sendfile+0xb06/0xe50 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1417 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: 0033:0x7f36a6d8f7c9 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:00007f36a7b6f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f36a6fe5fa0 RCX: 00007f36a6d8f7c9 RDX: 0000000000000000 RSI: 000000000000000b RDI: 000000000000000b RBP: 00007f36a6e13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f36a6fe6038 R14: 00007f36a6fe5fa0 R15: 00007ffd83c52c98 --- 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