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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 27 Nov 2018 08:11:18 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wAR8BHs660162296 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 27 Nov 2018 08:11:17 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6EB114C04E; Tue, 27 Nov 2018 08:11:17 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2FE734C040; Tue, 27 Nov 2018 08:11:17 +0000 (GMT) Received: from osiris (unknown [9.152.212.95]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 27 Nov 2018 08:11:17 +0000 (GMT) Date: Tue, 27 Nov 2018 09:11:15 +0100 From: Heiko Carstens To: Peter Zijlstra , Thomas Gleixner , Ingo Molnar Cc: Martin Schwidefsky , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: WARN_ON_ONCE(!new_owner) within wake_futex_pi() triggered MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 18112708-0016-0000-0000-0000022D3DCD X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18112708-0017-0000-0000-000032859514 Message-Id: <20181127081115.GB3625@osiris> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit Content-Disposition: inline X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-27_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=855 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811270074 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, with the glibc self-tests I was able to trigger the "this should not happen" warning ;) below on s390 (with panic_on_warn=1 set). It looks like it is hardly reproducible. This one happened with commit d146194f31c9 for compiling the kernel. Config can be re-created with "make ARCH=s390 performance_defconfig". [ 649.596938] WARNING: CPU: 0 PID: 58886 at kernel/futex.c:1418 do_futex+0xa9a/0xc50 [ 649.596946] Kernel panic - not syncing: panic_on_warn set ... [ 649.596951] CPU: 0 PID: 58886 Comm: ld64.so.1 Not tainted 4.20.0-20181125.rc3.git0.d146194f31c9.300.fc29.s390x+git #1 [ 649.596953] Hardware name: IBM 2964 NC9 702 (z/VM 6.4.0) [ 649.596956] Call Trace: [ 649.596963] ([<0000000000113050>] show_stack+0x58/0x70) [ 649.596970] [<0000000000a62a92>] dump_stack+0x7a/0xa8 [ 649.596975] [<0000000000144012>] panic+0x11a/0x258 [ 649.596978] [<0000000000143e70>] __warn+0xf8/0x118 [ 649.596981] [<0000000000a61c20>] report_bug+0xd8/0x150 [ 649.596985] [<00000000001014ac>] do_report_trap+0xc4/0xe0 [ 649.596988] [<0000000000101680>] illegal_op+0x138/0x150 [ 649.596994] [<0000000000a82bec>] pgm_check_handler+0x1cc/0x220 [ 649.596998] [<00000000001e89b2>] do_futex+0xa9a/0xc50 [ 649.597002] ([<00000000001e8b16>] do_futex+0xbfe/0xc50) [ 649.597006] [<00000000001e8c4c>] sys_futex+0xe4/0x170 [ 649.597010] [<0000000000a82800>] system_call+0xdc/0x2c8 Thanks, Heiko