From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 140951339A4 for ; Mon, 2 Feb 2026 07:34:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770017664; cv=none; b=RJDKUvp86JwMXH3dZ4a2z+73l7iVNwndzsWDbaYBvczK7/C5z2eIpJsyALt/7Sjb26W7sSQWtIgq7rUhB7o+8HSgKaWbQxaXqdGSNZI4nFj4BFkBv8tFZYfYEg2X5dJnZ1zUC3R3LDUqBvW7CCvA5g8WxwHQWlZR6Sfh1QNyMo4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770017664; c=relaxed/simple; bh=bz4BMtQpEisORq37jLq/Epf4vK+f2pPhFmc0EpBiPbU=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=OJK1Mppz2aqgUwIxa22lO1Iipz3qoPpEkHp1CWWgTkXv5vjAkOnTpuazgO1ttK+2LaOJ7ongr5JdIm4pYTVre/MPy2Q/t8VI64bc76rvHbLVnuZ1MvO1RwwSf73hXbQfYs+UKeoiJPFFpD0sPpS/cIRVfZS2KWCZ+rv5XQgu3X8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CAgbUKxi; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CAgbUKxi" Received: by smtp.kernel.org (Postfix) with ESMTPS id A365CC2BC86 for ; Mon, 2 Feb 2026 07:34:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770017663; bh=bz4BMtQpEisORq37jLq/Epf4vK+f2pPhFmc0EpBiPbU=; h=From:To:Subject:Date:From; b=CAgbUKxiONpU2b7rZxvqpqmX3AOQ+5mFPWqdMyxaadLp+Uk5FmzPUSA7SXDb1NgSz X1E9VCX+Dux5TCrmCJAaX4bYVDnLH6SDfZpHoDoMoI64todAcPmBv5joWO59coH/j+ 4329ixBaH9rm0iXHAx6Xz7/2BGVgABGfpL2uahlu1BHg/LYSBZQVhb1nELgo8zbNug WL3Bw11baQBmlEiP8jZpK3CDRKry+6ntoe88ZwOe2Yoj4jUEZ8EIePoMO4fsaOBZ1s 0JeyoLsphaU6ipG3rcG3swSipQZwMEW/ON94TljysVAjwrEHjStOgskDGCyWkOyi8y +iRXlHMNAZ79A== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 99C40C53BC5; Mon, 2 Feb 2026 07:34:23 +0000 (UTC) From: bugzilla-daemon@kernel.org To: kvm@vger.kernel.org Subject: [Bug 221033] New: Real time clock does not trigger alarm on QEMU Date: Mon, 02 Feb 2026 07:34:23 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: low X-Bugzilla-Who: richard.lyu@suse.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D221033 Bug ID: 221033 Summary: Real time clock does not trigger alarm on QEMU Product: Virtualization Version: unspecified Hardware: i386 OS: Linux Status: NEW Severity: low Priority: P3 Component: kvm Assignee: virtualization_kvm@kernel-bugs.osdl.org Reporter: richard.lyu@suse.com Regression: No LTP test rtc01.c [0] attempts to enable alarm via ioctl() RTC_AIE_ON on /dev/rtc. Following select() timeouts (returns zero) instead of triggering alarm. I would expect to fail with -1 or pass, timeout is strange: ./rtc01 rtc01 0 TINFO : RTC READ TEST: rtc01 1 TPASS : RTC READ TEST Passed rtc01 0 TINFO : Current RTC date/time is 14-11-2025, 01:35:18. rtc01 0 TINFO : RTC ALARM TEST : rtc01 0 TINFO : Alarm time set to 01:35:23. rtc01 0 TINFO : Waiting 5 seconds for the alarm... rtc01 2 TFAIL : rtc01.c:151: Timed out waiting for the alarm rtc01 0 TINFO : RTC UPDATE INTERRUPTS TEST : rtc01 0 TINFO : Waiting for 5 update interrupts... rtc01 3 TFAIL : rtc01.c:208: Timed out waiting for the update interrupt rtc01 0 TINFO : RTC Tests Done! The bug only triggers in a VM, not on bare metal. I'm not sure yet whether = this is a bug or expected behavior within a VM environment. [0] https://github.com/linux-test-project/ltp/tree/master/testcases/kernel/devi= ce-drivers/rtc --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=