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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 28 Feb 2020 07:54:12 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01S7sBLS54132926 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 28 Feb 2020 07:54:11 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 65121A4065; Fri, 28 Feb 2020 07:54:11 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4734AA4067; Fri, 28 Feb 2020 07:54:11 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.219]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 28 Feb 2020 07:54:11 +0000 (GMT) To: Ingo Molnar , Peter Zijlstra , "linux-kernel@vger.kernel.org" From: Christian Borntraeger Subject: 5.6-rc3: WARNING: CPU: 48 PID: 17435 at kernel/sched/fair.c:380 enqueue_task_fair+0x328/0x440 Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20022807-0008-0000-0000-0000035738A3 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20022807-0009-0000-0000-00004A785CFC Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-28_01:2020-02-26,2020-02-28 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 mlxscore=0 spamscore=0 mlxlogscore=593 bulkscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 adultscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002280065 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter, it seems that your new assert did trigger for me: The system was running fine for 4 hours and then this happened. Unfortunately I have no idea if this reproduces and if so how. [15260.753944] ------------[ cut here ]------------ [15260.753949] rq->tmp_alone_branch != &rq->leaf_cfs_rq_list [15260.753959] WARNING: CPU: 48 PID: 17435 at kernel/sched/fair.c:380 enqueue_task_fair+0x328/0x440 [15260.753961] Modules linked in: kvm xt_CHECKSUM xt_MASQUERADE nf_nat_tftp nf_conntrack_tftp xt_CT tun bridge stp llc xt_tcpudp ip6t_REJECT nf_reject_ipv6 ip6t_rpfilter ipt_REJECT nf_reject_ipv4 xt_conntrack ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nfnetlink ip6table_filter ip6_tables iptable_filter rpcrdma sunrpc rdma_ucm rdma_cm iw_cm ib_cm configfs s390_trng mlx5_ib ghash_s390 prng ib_uverbs aes_s390 ib_core des_s390 libdes sha3_512_s390 genwqe_card vfio_ccw vfio_mdev sha3_256_s390 mdev crc_itu_t sha512_s390 vfio_iommu_type1 sha1_s390 vfio eadm_sch zcrypt_cex4 sch_fq_codel ip_tables x_tables mlx5_core sha256_s390 sha_common pkey zcrypt rng_core autofs4 [15260.754002] CPU: 48 PID: 17435 Comm: cc1 Not tainted 5.6.0-rc3+ #24 [15260.754004] Hardware name: IBM 3906 M04 704 (LPAR) [15260.754005] Krnl PSW : 0404c00180000000 0000000942282e3c (enqueue_task_fair+0x32c/0x440) [15260.754008] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3 [15260.754010] Krnl GPRS: 00000000000003e0 0000001fbd60ee00 000000000000002d 00000009435347c2 [15260.754012] 000000000000002c 00000009428ec950 0000000900000000 0000000000000001 [15260.754013] 0000001fbd60ed00 0000001fbd60ed00 0000001fbd60ee00 0000000000000000 [15260.754014] 0000001c633ea000 0000000942c34670 0000000942282e38 000003e00140baf8 [15260.754066] Krnl Code: 0000000942282e2c: c020005d39d8 larl %r2,0000000942e2a1dc 0000000942282e32: c0e5fffdcc3f brasl %r14,000000094223c6b0 #0000000942282e38: af000000 mc 0,0 >0000000942282e3c: a7f4ff22 brc 15,0000000942282c80 0000000942282e40: 41b06340 la %r11,832(%r6) 0000000942282e44: e3d063480004 lg %r13,840(%r6) 0000000942282e4a: b904004b lgr %r4,%r11 0000000942282e4e: b904003d lgr %r3,%r13 [15260.754080] Call Trace: [15260.754083] [<0000000942282e3c>] enqueue_task_fair+0x32c/0x440 [15260.754085] ([<0000000942282e38>] enqueue_task_fair+0x328/0x440) [15260.754087] [<0000000942272d78>] activate_task+0x88/0xf0 [15260.754088] [<00000009422732e8>] ttwu_do_activate+0x58/0x78 [15260.754090] [<00000009422742ce>] try_to_wake_up+0x256/0x650 [15260.754093] [<000000094229248e>] swake_up_locked.part.0+0x2e/0x70 [15260.754095] [<00000009422927ac>] swake_up_one+0x54/0x88 [15260.754151] [<000003ff8044c15a>] kvm_vcpu_wake_up+0x52/0x78 [kvm] [15260.754161] [<000003ff8046af02>] kvm_s390_vcpu_wakeup+0x2a/0x40 [kvm] [15260.754171] [<000003ff8046b68e>] kvm_s390_idle_wakeup+0x6e/0xa0 [kvm] [15260.754175] [<00000009422dd05c>] __hrtimer_run_queues+0x114/0x2f0 [15260.754178] [<00000009422dddb4>] hrtimer_interrupt+0x12c/0x2a8 [15260.754181] [<0000000942200d3c>] do_IRQ+0xac/0xb0 [15260.754185] [<0000000942c25684>] ext_int_handler+0x130/0x134 [15260.754186] Last Breaking-Event-Address: [15260.754189] [<000000094223c710>] __warn_printk+0x60/0x68 [15260.754190] ---[ end trace e84a48be72a8b514 ]---