From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f80.google.com (mail-ot1-f80.google.com [209.85.210.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4BC4B30BF4F for ; Mon, 3 Aug 2026 06:40:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785739235; cv=none; b=JXvKntsDHlmo2ciJLu7T5NAsNygKHaqB7YoOfgwWUE/7LCeSqMihxIb2CAYOpwzUrbzvh5Zglw9xz4pvJjGifUqgfnjQNBuPDLY3CqCdS0l6X2pNIWDDAwLGU3QZn0Fcf3SE0fevZR0kln98pTMivWdqGb/salynIA4M6VmCCRU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785739235; c=relaxed/simple; bh=dmb3rUKjwSDLaTyLcEY7fuRe3cBSr9Vd9XJPMSE3SAw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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2002:a05:6820:1614:b0:6a3:e11b:c44 with SMTP id 006d021491bc7-6ae4320bb54mr12057715eaf.14.1785739233041; Sun, 02 Aug 2026 23:40:33 -0700 (PDT) Date: Sun, 02 Aug 2026 23:40:33 -0700 In-Reply-To: <6a470486.52c20a74.1f8b39.000c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7037e1.2d659fcc.1d46f5.01e6.GAE@google.com> Subject: Re: [syzbot] [mm?] WARNING in update_rq_clock (2) From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, mingo@redhat.com, nogikh@google.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: cc2b5f627e8c Add linux-next specific files for 20260714 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=17122649580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2290ccbf984c524f dashboard link: https://syzkaller.appspot.com/bug?extid=681e729b2cf0d4860042 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11908cc6580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1042ec9e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6836f8efb1da/disk-cc2b5f62.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0109d3477cc7/vmlinux-cc2b5f62.xz kernel image: https://storage.googleapis.com/syzbot-assets/c2e49e350bbf/bzImage-cc2b5f62.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+681e729b2cf0d4860042@syzkaller.appspotmail.com ------------[ cut here ]------------ debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0) WARNING: kernel/sched/sched.h:1652 at lockdep_assert_rq_held kernel/sched/sched.h:1652 [inline], CPU#0: syz-executor108/5647 WARNING: kernel/sched/sched.h:1652 at update_rq_clock+0x34d/0x560 kernel/sched/core.c:865, CPU#0: syz-executor108/5647 Modules linked in: CPU: 0 UID: 0 PID: 5647 Comm: syz-executor108 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1652 [inline] RIP: 0010:update_rq_clock+0x34d/0x560 kernel/sched/core.c:865 Code: 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 8b f0 9d 00 4c 01 3b 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 85 e6 bf 09 cc 90 <0f> 0b 90 e9 42 fd ff ff 48 89 df 48 83 c4 10 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90004e9f618 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b873b880 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8dbfaa0e RDI: ffffffff8bcbd080 RBP: dffffc0000000000 R08: ffffffff8fd0c47f R09: 1ffffffff1fa188f R10: dffffc0000000000 R11: ffffffff819e4d80 R12: 0000000000000001 R13: dffffc0000000001 R14: ffff8880b873c748 R15: ffff8880b873b880 FS: 00007fb5334a16c0(0000) GS:ffff8881259f2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb5334a0ff8 CR3: 0000000034948000 CR4: 00000000003526f0 Call Trace: pick_next_task kernel/sched/core.c:6335 [inline] __schedule+0x3774/0x5530 kernel/sched/core.c:7146 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7553 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__outb arch/x86/include/asm/shared/io.h:22 [inline] RIP: 0010:rtc_cmos_write+0x13/0x20 arch/x86/kernel/rtc.c:97 Code: 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 89 f3 89 fd e8 51 9f 59 00 89 d8 e6 70 <89> e8 e6 71 5b 5d c3 cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90004e9f970 EFLAGS: 00000293 RAX: 000000000000000f RBX: 000000000000000f RCX: ffff8880350e3e80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8e3c3880 R12: ffffffff8dc427d8 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff8880b8723f90 smpboot_restore_warm_reset_vector arch/x86/kernel/smpboot.c:162 [inline] arch_cpuhp_cleanup_kick_cpu+0xbf/0x150 arch/x86/kernel/smpboot.c:1129 cpuhp_bp_sync_alive kernel/cpu.c:449 [inline] cpuhp_bringup_ap+0x90/0x360 kernel/cpu.c:843 cpuhp_invoke_callback+0x434/0x810 kernel/cpu.c:194 __cpuhp_invoke_callback_range kernel/cpu.c:972 [inline] cpuhp_invoke_callback_range kernel/cpu.c:996 [inline] cpuhp_up_callbacks kernel/cpu.c:1027 [inline] _cpu_up+0x2ce/0x5b0 kernel/cpu.c:1674 cpu_up+0x1d2/0x220 kernel/cpu.c:1706 cpu_subsys_online+0x67/0x280 drivers/base/cpu.c:61 device_online+0x181/0x1e0 drivers/base/core.c:4308 online_store+0xd7/0x1a0 drivers/base/core.c:2879 kernfs_fop_write_iter+0x3a5/0x540 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x17b/0x530 arch/x86/entry/syscall_64.c:85 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb5334ea0a9 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb5334a11d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb53359ab58 RCX: 00007fb5334ea0a9 RDX: 0000000000000001 RSI: 0000200000000180 RDI: 0000000000000003 RBP: 00007fb53359ab50 R08: 00007fb5334a16c0 R09: 35203a6b63617473 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb53356c378 R13: 0000200000000100 R14: 0000200000000140 R15: 0000200000000180 ---------------- Code disassembly (best guess): 0: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: f3 0f 1e fa endbr64 1b: 55 push %rbp 1c: 53 push %rbx 1d: 89 f3 mov %esi,%ebx 1f: 89 fd mov %edi,%ebp 21: e8 51 9f 59 00 call 0x599f77 26: 89 d8 mov %ebx,%eax 28: e6 70 out %al,$0x70 * 2a: 89 e8 mov %ebp,%eax <-- trapping instruction 2c: e6 71 out %al,$0x71 2e: 5b pop %rbx 2f: 5d pop %rbp 30: c3 ret 31: cc int3 32: cc int3 33: cc int3 34: cc int3 35: cc int3 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop --- 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.