From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f70.google.com (mail-oo1-f70.google.com [209.85.161.70]) (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 65D8C2FB08C for ; Fri, 6 Mar 2026 02:52:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772765547; cv=none; b=g0jNx4NGijeOLaOUeqMQCCw/3CQbXIkUAXvT0XED4zIGkOWaM5W1fksUV7CfzEBx980JhluGxDBbZys9k1pvdHEEILvEqveYuo2dCvy5KiUN0DL4j4XZdDG3wb0mFHtBIrTFoFoT4rSy5NyEXDPEMyLrbB/2yK3WhwUEUuboId0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772765547; c=relaxed/simple; bh=3kyTu67gItBCGgGzBxeXP/3/nFjVZP1raUGRT9EAcMI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=NPQEaj/6VVAJR6wW0+jB/XTtxdcw+5YrvJvbcmlLRTuMtd45wa7nqiE0CL5Oey7GZleakOVONu4aShK8gE3bcT+rPqean29SvwSAp8lN5n0C1lnIhypudkHgXizamQuGtcUC5ofcEpd1JRiEZ0XQ8Y8MEiI6MEOdaKo1yktVdZ4= 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=209.85.161.70 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-oo1-f70.google.com with SMTP id 006d021491bc7-67995e1ecacso138460556eaf.0 for ; Thu, 05 Mar 2026 18:52:26 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772765545; x=1773370345; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=xGphjguDhcNWZhcSM3NWIHmvExHdD8blcZgs8SaJD4E=; b=YMbL/zcuHULGP0c5t4hh1gOvlzErMaMKGORmgJhFov1H/rlYxKn0NDizq9IEQV0njT GYh7q2pu1YZ2QzLH9kUCV2EtkcS98n4U+R0Gy9UwaMeZbNAsCvKcvqRGTqob2yOAS8vQ dUgW2o01bsLElMgApUx6habkjSAJmVcKBDKpjHNc+kxcXZBckvXsGWz29fujG4pas1AI l0QV9yZqUbNb6IEC88AXPx9qH5XHrxTUTnaa0RhH4dqMRKYONLHWUrGkQSNeT7tiaiau hrGa8jgd7nx/vFNiIzwbrzziHgWCuUF4GKOf1abhDc/f+qJwe8yo8oXIoTr6hFy6He1v KfQQ== X-Forwarded-Encrypted: i=1; AJvYcCXb04TxhCQz0Lj50hBVFydo8KNCif90ucyK8qfFcHqoQnmMz/5OrByd3QcTJoL8zRrrlv1ywSz6RRvu4/w=@vger.kernel.org X-Gm-Message-State: AOJu0YxEx/vozwuc0KaycisyDSwli5Z/LjsTg6HfLo9bcUVIDypYeJSY fSrDXMYJyjjxQaRPRCqDxrYS0vOmOgwyhaPXcIbr+oHU4W9M/4xwt3MLQz7UjJQ8n6NiWstzbgP VyArfzerB53YMkKjP5+QTP/Rq4HrTaFWi4Cqz1WNdzZmEGKxEEjde2Z8ieNE= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b07:b0:67a:1c94:8d94 with SMTP id 006d021491bc7-67b9bd497b0mr501630eaf.60.1772765545431; Thu, 05 Mar 2026 18:52:25 -0800 (PST) Date: Thu, 05 Mar 2026 18:52:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69aa4169.050a0220.13f275.0007.GAE@google.com> Subject: [syzbot] [kernel?] KMSAN: uninit-value in timespec64_add_safe From: syzbot To: jstultz@google.com, linux-kernel@vger.kernel.org, sboyd@kernel.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e2bd1b136926 Merge tag 'core-debugobjects-2026-03-01' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1307a202580000 kernel config: https://syzkaller.appspot.com/x/.config?x=10f867da86e38691 dashboard link: https://syzkaller.appspot.com/bug?extid=5fca9514ef36ad94d973 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/dc98e5be9809/disk-e2bd1b13.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8b4eb1704ccf/vmlinux-e2bd1b13.xz kernel image: https://storage.googleapis.com/syzbot-assets/6016576769b8/bzImage-e2bd1b13.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5fca9514ef36ad94d973@syzkaller.appspotmail.com udevd[5131]: starting eudev-3.2.14 ===================================================== BUG: KMSAN: uninit-value in set_normalized_timespec64 kernel/time/time.c:492 [inline] BUG: KMSAN: uninit-value in timespec64_add_safe+0x4b4/0x520 kernel/time/time.c:846 set_normalized_timespec64 kernel/time/time.c:492 [inline] timespec64_add_safe+0x4b4/0x520 kernel/time/time.c:846 ep_timeout_to_timespec fs/eventpoll.c:1872 [inline] __do_sys_epoll_wait fs/eventpoll.c:2471 [inline] __se_sys_epoll_wait fs/eventpoll.c:2465 [inline] __x64_sys_epoll_wait+0x1fa/0x3a0 fs/eventpoll.c:2465 x64_sys_call+0x2ece/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:233 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable now.i.i.i created at: ep_timeout_to_timespec fs/eventpoll.c:1857 [inline] __do_sys_epoll_wait fs/eventpoll.c:2471 [inline] __se_sys_epoll_wait fs/eventpoll.c:2465 [inline] __x64_sys_epoll_wait+0xcf/0x3a0 fs/eventpoll.c:2465 x64_sys_call+0x2ece/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:233 CPU: 0 UID: 0 PID: 5131 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ===================================================== Kernel panic - not syncing: kmsan.panic set ... CPU: 0 UID: 0 PID: 5131 Comm: udevd Tainted: G B syzkaller #0 PREEMPT(full) Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x26/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x50/0x1c0 lib/dump_stack.c:120 dump_stack+0x1e/0x25 lib/dump_stack.c:129 vpanic+0x7b4/0x1430 kernel/panic.c:650 panic+0x15d/0x160 kernel/panic.c:787 kmsan_report+0x31a/0x320 mm/kmsan/report.c:218 __msan_warning+0x1b/0x30 mm/kmsan/instrumentation.c:315 set_normalized_timespec64 kernel/time/time.c:492 [inline] timespec64_add_safe+0x4b4/0x520 kernel/time/time.c:846 ep_timeout_to_timespec fs/eventpoll.c:1872 [inline] __do_sys_epoll_wait fs/eventpoll.c:2471 [inline] __se_sys_epoll_wait fs/eventpoll.c:2465 [inline] __x64_sys_epoll_wait+0x1fa/0x3a0 fs/eventpoll.c:2465 x64_sys_call+0x2ece/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:233 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd5f3ea7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffec9f715a0 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 00007fd5f456c880 RCX: 00007fd5f3ea7407 RDX: 0000000000000008 RSI: 00007ffec9f71700 RDI: 000000000000000b RBP: 00000000000000b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000000 R13: 000055fdbce5d100 R14: 000055fddbf24b30 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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