From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f72.google.com (mail-ot1-f72.google.com [209.85.210.72]) (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 72FE926ED31 for ; Tue, 17 Feb 2026 11:12:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771326755; cv=none; b=J+kv+Df9lQ9CgCIJcD6hJ4a0D3VaKu6VKwNVJq7LML4o5klFZ+j5m0MWjlpE6fA9jVq2X0spiO9Yj6pUYvqmopYYXTYWq6bJDiIQ4sHzPcPLiFi7RWdoLnQAWzXf9OaB21gm5lK77FF+V59kaWEEJrS/5UJ8/Ns8EkYhiUr5lhI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771326755; c=relaxed/simple; bh=S6qTfZIexDvKq3ZnnwKnAieEK95Avh7H33DMTkLNk9M=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=pvxAjeaY1uYmmS5ELcdwgi5h6KbZhhyfZVlTbI/cqoBb8lzKth/xP6IIOO0GUMlXUrizkbcehgtzlPhPJ21DM0QLL08LQUanoOEHtKIg48Ttpf+TNIODqMj51DWT4EfGllbjVl5VB4Kr97GW5vgOwHnn5I+ttDWEE8BNLykE0+g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f72.google.com with SMTP id 46e09a7af769-7d4cf783c73so47366358a34.3 for ; Tue, 17 Feb 2026 03:12:34 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771326753; x=1771931553; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=TqgbY7TuWklzkLkZh4VhQKHpH1pO0bDVAokZzzPGHzQ=; b=IemAQwxs2Wlhv40gOCmD/0cE/GTqJShkN6nXg39TMxLdKHFQTtzBoNI10Z5Ht2g/Bm EpsJFQuvC1E1ykP4enKRRqrhwWFwE5jT4V2gSRmI6Mv6VWkSP1tethNj6EmINiXWeNuz 9hikkv1bW4QbmVoP1WOHBb9XVwwteJkpUpbYmqmInLShTr9txuJMce085jGAtleNIW3f qhIL689U7C7ARMpiIh7zIWuM5Eko2aM4C93HOQd9+u98fy0F0j1Q+MDlhZhiQDWtay8h K2PVvmI2gBLsmEnaAGqzA/xYojUkKDFdCSXCVxED1NnPxPDMEJsNVMdX30MJAzbs17qa E8Rg== X-Forwarded-Encrypted: i=1; AJvYcCXW2arofiVqalwdqsG0pP1qR+LlVGjJQM/GQuKDwDgOaESTgYSlon2rKccPYFyGFFfhoOnY/jVDXOe4oOs=@vger.kernel.org X-Gm-Message-State: AOJu0Yx2jdDd9lBsXqYV5T/HhLl//UE09DBmy6cIuWYTRdY6agofSI4S dGjyjYdHDZsqJLS7QnkBYNqnaKndoprSQ7JCjttnBkLDrPZ0/OSbxx/JSyeDWGWZyFdaiNyskCX zOshlXuvv7xZ50ZH8/LSx7fOjFjiMp028rL32J96ydqpSjro+af8lbCXNuK8= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:f00a:b0:663:b2a:60e6 with SMTP id 006d021491bc7-67769c709d7mr7012628eaf.81.1771326753365; Tue, 17 Feb 2026 03:12:33 -0800 (PST) Date: Tue, 17 Feb 2026 03:12:33 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69944d21.a70a0220.2c38d7.00fd.GAE@google.com> Subject: [syzbot] [kernel?] KMSAN: uninit-value in futex_hash From: syzbot To: andrealmeid@igalia.com, dave@stgolabs.net, dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: cee73b1e840c Merge tag 'riscv-for-linus-7.0-mw1' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1638be5a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=50148b563a4d5941 dashboard link: https://syzkaller.appspot.com/bug?extid=37668eee60869ca40d13 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/baba834beb3d/disk-cee73b1e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d7073a8426d0/vmlinux-cee73b1e.xz kernel image: https://storage.googleapis.com/syzbot-assets/38609bc4ef50/bzImage-cee73b1e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+37668eee60869ca40d13@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in futex_hash+0x5d2/0x630 kernel/futex/core.c:312 futex_hash+0x5d2/0x630 kernel/futex/core.c:312 class_hb_constructor kernel/futex/futex.h:240 [inline] futex_wake+0x1b9/0x920 kernel/futex/waitwake.c:172 do_futex+0x419/0x480 kernel/futex/syscalls.c:135 __do_sys_futex_time32 kernel/futex/syscalls.c:515 [inline] __se_sys_futex_time32+0x557/0x6c0 kernel/futex/syscalls.c:498 __ia32_sys_futex_time32+0x112/0x1a0 kernel/futex/syscalls.c:498 ia32_sys_call+0x11ea/0x4360 arch/x86/include/generated/asm/syscalls_32.h:241 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x17f/0x3f0 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Uninit was created at: __alloc_frozen_pages_noprof+0x6df/0xf50 mm/page_alloc.c:5267 __alloc_pages_noprof mm/page_alloc.c:5278 [inline] __alloc_pages_node_noprof include/linux/gfp.h:285 [inline] alloc_pages_node_noprof include/linux/gfp.h:312 [inline] alloc_pages_exact_nid_noprof+0xd3/0x6c0 mm/page_alloc.c:5462 futex_init+0x191/0x550 kernel/futex/core.c:1996 do_one_initcall+0x22e/0xad0 init/main.c:1382 do_initcall_level+0x157/0x2e0 init/main.c:1444 do_initcalls+0x176/0x310 init/main.c:1460 do_basic_setup+0x1d/0x30 init/main.c:1479 kernel_init_freeable+0x213/0x460 init/main.c:1692 kernel_init+0x2f/0x5e0 init/main.c:1582 ret_from_fork+0x20f/0x910 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 1 UID: 0 PID: 22760 Comm: syz.3.5416 Tainted: G D W L syzkaller #0 PREEMPT(full) Tainted: [D]=DIE, [W]=WARN, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 --- 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