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AFNElJ8c3IeTthKHK4YhjsIYMV2fdUNjRbQQrwJKXUUUWNoheKTfH74ZPl3DsraUwFLddCDKVqpLKpZe@vger.kernel.org X-Gm-Message-State: AOJu0Ywr64PVocvcjViVQ3liudiAJNaX1BaYicD1/EZdjTKEqyLWuBBj KL0fNxaRdtbcMCufA7z2SY3/SmeRIoZxAVAn1rbDSI6OC3dZcqHWHnR5KJJhAK4FgSderhOq69F JbhCx/6QQtA+F2udzVnPWCUCqybuQ72do7SdOLrqeXzDeVWdzyDQeglLelks= Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b86:b0:67d:ea53:b9c8 with SMTP id 006d021491bc7-69eac8d9b8dmr3506618eaf.18.1781046273469; Tue, 09 Jun 2026 16:04:33 -0700 (PDT) Date: Tue, 09 Jun 2026 16:04:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a289c01.39669fcc.33b062.00a9.GAE@google.com> Subject: [syzbot] [cgroups?] [mm?] WARNING in hrtick_start_fair From: syzbot To: anna-maria@linutronix.de, cgroups@vger.kernel.org, frederic@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a87737435cfa Add linux-next specific files for 20260608 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11715db6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=da47745f686dc823 dashboard link: https://syzkaller.appspot.com/bug?extid=2cbf10efc23b22ff9c31 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12df60ae580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11edb0ae580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/85d19fe6bb4e/disk-a8773743.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/30c683ce26e1/vmlinux-a8773743.xz kernel image: https://storage.googleapis.com/syzbot-assets/4db5027513d2/bzImage-a8773743.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2cbf10efc23b22ff9c31@syzkaller.appspotmail.com ------------[ cut here ]------------ task_rq(p) != rq WARNING: kernel/sched/fair.c:7656 at hrtick_start_fair+0x196/0x1f0 kernel/sched/fair.c:7656, CPU#0: rcu_preempt/18 Modules linked in: CPU: 0 UID: 0 PID: 18 Comm: rcu_preempt Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:hrtick_start_fair+0x196/0x1f0 kernel/sched/fair.c:7656 Code: 42 80 3c 20 00 74 08 4c 89 ff e8 85 e3 97 00 4d 39 37 0f 85 0c ff ff ff 48 89 df 5b 41 5c 41 5d 41 5e 41 5f e9 4b 65 fa ff 90 <0f> 0b 90 e9 d1 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 82 RSP: 0018:ffffc900001777e0 EFLAGS: 00010087 RAX: ffff8880b873ba40 RBX: ffff8880b863ba40 RCX: ffffffff8197c7de RDX: 0000000000000000 RSI: ffff88802c528000 RDI: ffff8880b863ba40 RBP: dffffc0000000000 R08: ffffffff8fcf0b0f R09: 1ffffffff1f9e161 R10: dffffc0000000000 R11: fffffbfff1f9e162 R12: dffffc0000000000 R13: 1ffff110170c78d6 R14: ffff88802c528000 R15: ffffffff8dc217d8 FS: 0000000000000000(0000) GS:ffff888125a76000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff95e6a540 CR3: 0000000028e30000 CR4: 00000000003526f0 Call Trace: set_next_task_fair+0xa68/0xce0 kernel/sched/fair.c:15058 put_prev_set_next_task kernel/sched/sched.h:2770 [inline] pick_next_task kernel/sched/core.c:6443 [inline] __schedule+0x3e03/0x5550 kernel/sched/core.c:7144 __schedule_loop kernel/sched/core.c:7308 [inline] schedule+0x164/0x360 kernel/sched/core.c:7323 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x312/0x11b0 kernel/rcu/tree.c:2123 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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