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AFNElJ8nE4fAr9EYatIpZOxLTq3YKHm+uIYZjvEcd6fcmKtUA/jomx1CybjgjoK4TRfiu0i/fSknAuxSXpY=@vger.kernel.org X-Gm-Message-State: AOJu0YyjMEQVnC3JOppMToFQjogiu5dfnGkQgHnW3Z0KYkWJEi0CJg1U XRN6Gcg7cxIIh3BW9ApccEw7OO25xR4wvMKxZk2l5Sf626e+t7SpH50+OdM44R19BLg1HnP3yIo YsMecu0iRieI92BvhZuw7iYhiqOaGhv72VK1O+G5nLAdUoUrR9/es5kQZieM= Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1f06:b0:694:8f3a:3f3d with SMTP id 006d021491bc7-69c94375246mr11683344eaf.35.1779173917016; Mon, 18 May 2026 23:58:37 -0700 (PDT) Date: Mon, 18 May 2026 23:58:37 -0700 In-Reply-To: <20260519012754.240804-1-leobras.c@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0c0a1d.050a0220.154e79.0003.GAE@google.com> Subject: [syzbot ci] Re: Introduce Per-CPU Work helpers (was QPW) From: syzbot ci To: akpm@linux-foundation.org, axelrasmussen@google.com, baohua@kernel.org, bhe@redhat.com, boqun@kernel.org, bp@alien8.de, brauner@kernel.org, chrisl@kernel.org, cl@gentwo.org, corbet@lwn.net, coxu@redhat.com, dapeng1.mi@linux.intel.com, david@kernel.org, dianders@chromium.org, ebiggers@kernel.org, elver@google.com, feng.tang@linux.alibaba.com, frederic@kernel.org, gary@garyguo.net, hannes@cmpxchg.org, hao.li@linux.dev, harry@kernel.org, jackmanb@google.com, jannh@google.com, kasong@tencent.com, kees@kernel.org, kuba@kernel.org, leobras.c@gmail.com, liam@infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-rt-devel@lists.linux.dev, lirongqing@baidu.com, ljs@kernel.org, longman@redhat.com, masahiroy@kernel.org, mhocko@suse.com, mingo@redhat.com, mtosatti@redhat.com, nathan@kernel.org, nphamcs@gmail.com, nsc@kernel.org, ojeda@kernel.org, pasha.tatashin@soleen.com, paulmck@kernel.org, peterz@infradead.org, pfalcato@suse.de, qi.zheng@linux.dev, rdunlap@infradead.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v4] Introduce Per-CPU Work helpers (was QPW) https://lore.kernel.org/all/20260519012754.240804-1-leobras.c@gmail.com * [PATCH v4 1/4] Introducing pw_lock() and per-cpu queue & flush work * [PATCH v4 2/4] mm/swap: move bh draining into a separate workqueue * [PATCH v4 3/4] swap: apply new pw_queue_on() interface * [PATCH v4 4/4] slub: apply new pw_queue_on() interface and found the following issue: WARNING in __pcs_replace_empty_main Full report is available here: https://ci.syzbot.org/series/804f81bd-77b4-490e-bd57-6345ad2aa923 *** WARNING in __pcs_replace_empty_main tree: drm-next URL: https://gitlab.freedesktop.org/drm/kernel.git base: 5200f5f493f79f14bbdc349e402a40dfb32f23c8 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/3ea80958-13bd-49da-9c64-6deb788113f= 8/config clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_= idle_ns: 19112604462750000 ns Zone ranges: DMA [mem 0x0000000000001000-0x0000000000ffffff] DMA32 [mem 0x0000000001000000-0x00000000ffffffff] Normal [mem 0x0000000100000000-0x000000023fffffff] Device empty Movable zone start for each node Early memory node ranges node 0: [mem 0x0000000000001000-0x000000000009efff] node 0: [mem 0x0000000000100000-0x000000007ffdefff] node 0: [mem 0x0000000100000000-0x0000000160000fff] node 1: [mem 0x0000000160001000-0x000000023fffffff] Initmem setup node 0 [mem 0x0000000000001000-0x0000000160000fff] Initmem setup node 1 [mem 0x0000000160001000-0x000000023fffffff] On node 0, zone DMA: 1 pages in unavailable ranges On node 0, zone DMA: 97 pages in unavailable ranges On node 0, zone Normal: 33 pages in unavailable ranges setup_percpu: NR_CPUS:8 nr_cpumask_bits:2 nr_cpu_ids:2 nr_node_ids:2 percpu: Embedded 71 pages/cpu s250632 r8192 d31992 u2097152 kvm-guest: PV spinlocks disabled, no host support Kernel command line: earlyprintk=3Dserial net.ifnames=3D0 sysctl.kernel.hun= g_task_all_cpu_backtrace=3D1 ima_policy=3Dtcb nf-conntrack-ftp.ports=3D2000= 0 nf-conntrack-tftp.ports=3D20000 nf-conntrack-sip.ports=3D20000 nf-conntra= ck-irc.ports=3D20000 nf-conntrack-sane.ports=3D20000 binder.debug_mask=3D0 = rcupdate.rcu_expedited=3D1 rcupdate.rcu_cpu_stall_cputime=3D1 no_hash_point= ers page_owner=3Don sysctl.vm.nr_hugepages=3D4 sysctl.vm.nr_overcommit_huge= pages=3D4 secretmem.enable=3D1 sysctl.max_rcu_stall_to_panic=3D1 msr.allow_= writes=3Doff coredump_filter=3D0xffff root=3D/dev/sda console=3DttyS0 vsysc= all=3Dnative numa=3Dfake=3D2 kvm-intel.nested=3D1 spec_store_bypass_disable= =3Dprctl nopcid vivid.n_devs=3D64 vivid.multiplanar=3D1,2,1,2,1,2,1,2,1,2,1= ,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,= 1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2 netrom.nr_ndevs=3D32 rose.rose_ndevs=3D32 s= mp.csd_lock_timeout=3D100000 watchdog_thresh=3D55 workqueue.watchdog_thresh= =3D140 sysctl.net.core.netdev_unregister_timeout_secs=3D140 dummy_hcd.num= =3D32 max_loop=3D32 nbds_max=3D32 \ Kernel command line: comedi.comedi_num_legacy_minors=3D4 panic_on_warn=3D1 = root=3D/dev/sda console=3DttyS0 root=3D/dev/sda1 Unknown kernel command line parameters "nbds_max=3D32", will be passed to u= ser space. printk: log buffer data + meta data: 262144 + 917504 =3D 1179648 bytes software IO TLB: area num 2. Fallback order for Node 0: 0 1=20 Fallback order for Node 1: 1 0=20 Built 2 zonelists, mobility grouping on. Total pages: 1834877 Policy zone: Normal mem auto-init: stack:all(zero), heap alloc:on, heap free:off stackdepot: allocating hash table via alloc_large_system_hash stackdepot hash table entries: 1048576 (order: 12, 16777216 bytes, linear) stackdepot: allocating space for 8192 stack pools via memblock ********************************************************** ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** ** ** ** This system shows unhashed kernel memory addresses ** ** via the console, logs, and other interfaces. This ** ** might reduce the security of your system. ** ** ** ** If you see this message and you are not debugging ** ** the kernel, report this immediately to your system ** ** administrator! ** ** ** ** Use hash_pointers=3Dalways to force this mode off ** ** ** ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** ********************************************************** ------------[ cut here ]------------ debug_locks && !(lock_is_held(&(&s->cpu_sheaves->lock)->dep_map) !=3D 0) WARNING: mm/slub.c:4601 at __pcs_replace_empty_main+0x51b/0x6e0, CPU#0: swa= pper/0 Modules linked in: CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted syzkaller #0 PREEMPT(undef)= =20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:__pcs_replace_empty_main+0x51b/0x6e0 Code: 48 85 f6 74 15 4c 89 ff 48 89 c6 e8 af 5e ff ff 4d 89 74 24 38 e9 36 = fc ff ff 49 89 44 24 40 4d 89 74 24 38 e9 27 fc ff ff 90 <0f> 0b 90 83 7b 2= c 00 0f 85 23 fb ff ff 48 8b 1b e8 20 cd 82 09 41 RSP: 0000:ffffffff8e607d58 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffffffff91bb8398 RCX: 0000000000000002 RDX: 0000000000000cc0 RSI: ffffffff8e21ec94 RDI: ffffffff8c28b160 RBP: 0000000000000cc0 R08: 0000000000005e00 R09: 00000000477ac845 R10: 0000000047d13f7f R11: 000000002fa01ecd R12: ffff88812103f308 R13: 0000000000000000 R14: ffffffff91bb8398 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88818dc8a000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 000000000e74a000 CR4: 00000000000000b0 Call Trace: kmem_cache_alloc_node_noprof+0x441/0x690 do_kmem_cache_create+0x172/0x620 create_boot_cache+0xbf/0x120 kmem_cache_init+0x11a/0x1e0 mm_core_init+0x7e/0xb0 start_kernel+0x15a/0x3e0 x86_64_start_reservations+0x24/0x30 x86_64_start_kernel+0x143/0x1c0 common_startup_64+0x13e/0x147 *** 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. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.