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Thu, 12 Feb 2026 10:00:01 -0800 (PST) Date: Thu, 12 Feb 2026 10:00:01 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698e1521.a70a0220.2c38d7.009b.GAE@google.com> Subject: [moderation/CI] Re: improve per-node allocation and reclaim visibility From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v1] improve per-node allocation and reclaim visibility https://lore.kernel.org/all/20260212045109.255391-1-inwardvessel@gmail.com * [PATCH 1/2] mm/mempolicy: track page allocations per mempolicy * [PATCH 2/2] mm: move pgscan and pgsteal to node stats and found the following issue: WARNING in __mod_node_page_state Full report is available here: https://ci.syzbot.org/series/4ec12ede-3298-43a3-ab6b-79d47759672e *** WARNING in __mod_node_page_state tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm= .git base: 72a46cdd4ef13690beb8c5a2f6a2023fd7ef2eb4 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp= 1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/0f678e4c-a4ba-4f17-8ed7-8ae99e56a46= 3/config ------------[ cut here ]------------ IS_ENABLED(CONFIG_PREEMPT_COUNT) && __lockdep_enabled && (preempt_count() = =3D=3D 0 && this_cpu_read(hardirqs_enabled)) WARNING: mm/vmstat.c:396 at __mod_node_page_state+0x126/0x170, CPU#0: kthre= add/2 Modules linked in: CPU: 0 UID: 0 PID: 2 Comm: kthreadd Not tainted syzkaller #0 PREEMPT(full)= =20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:__mod_node_page_state+0x126/0x170 Code: 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 89 df 4c 89 e6 44 89 fa = e8 68 00 00 00 31 db eb cc 90 0f 0b 90 e9 3e ff ff ff 90 <0f> 0b 90 eb 80 4= 8 c7 c7 e0 c6 64 8e 4c 89 f6 e8 66 3c d3 02 e9 28 RSP: 0000:ffffc900000773d0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 000000000000003d RDI: ffff88815fffb380 RBP: dffffc0000000000 R08: ffffffff8fef2977 R09: 1ffffffff1fde52e R10: dffffc0000000000 R11: fffffbfff1fde52f R12: ffff88815fffb380 R13: ffffffff92f50f00 R14: 000000000000003d R15: 000000000000003d FS: 0000000000000000(0000) GS:ffff88818e0f0000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 000000000e346000 CR4: 00000000000006f0 Call Trace: alloc_pages_mpol+0x407/0x740 alloc_pages_noprof+0xa8/0x190 get_free_pages_noprof+0xf/0x80 __kasan_populate_vmalloc+0x38/0x1d0 alloc_vmap_area+0xd21/0x1460 __get_vm_area_node+0x1f8/0x300 __vmalloc_node_range_noprof+0x372/0x1730 __vmalloc_node_noprof+0xc2/0x100 dup_task_struct+0x228/0x9a0 copy_process+0x508/0x3980 kernel_clone+0x248/0x870 kernel_thread+0x13f/0x1b0 kthreadd+0x4f9/0x6f0 ret_from_fork+0x51b/0xa40 ret_from_fork_asm+0x1a/0x30 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. The email will later be sent to: [akpm@linux-foundation.org apopple@nvidia.com axelrasmussen@google.com byun= gchul@sk.com cgroups@vger.kernel.org david@kernel.org eperezma@redhat.com g= ourry@gourry.net hannes@cmpxchg.org inwardvessel@gmail.com jasowang@redhat.= com joshua.hahnjy@gmail.com kernel-team@meta.com liam.howlett@oracle.com li= nux-kernel@vger.kernel.org linux-mm@kvack.org lorenzo.stoakes@oracle.com ma= tthew.brost@intel.com mhocko@suse.com mst@redhat.com muchun.song@linux.dev = rakie.kim@sk.com roman.gushchin@linux.dev rppt@kernel.org shakeel.butt@linu= x.dev surenb@google.com vbabka@suse.cz virtualization@lists.linux.dev weixu= gc@google.com xuanzhuo@linux.alibaba.com ying.huang@linux.alibaba.com yuanc= hu@google.com zhengqi.arch@bytedance.com ziy@nvidia.com] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid