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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20022815-0016-0000-0000-000002EB3332 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20022815-0017-0000-0000-0000334E6D21 Message-Id: <1a607a98-f12a-77bd-2062-c3e599614331@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-28_04:2020-02-28,2020-02-28 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=648 malwarescore=0 priorityscore=1501 clxscore=1015 mlxscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002280120 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Also happened with 5.4: Seems that I just happen to have an interesting test workload/system size interaction on a newly installed system that triggers this. [ 9761.439278] ------------[ cut here ]------------ [ 9761.439283] rq->tmp_alone_branch != &rq->leaf_cfs_rq_list [ 9761.439300] WARNING: CPU: 58 PID: 17405 at kernel/sched/fair.c:381 enqueue_task_fair+0x7cc/0x9b0 [ 9761.439303] 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 ghash_s390 prng mlx5_ib aes_s390 ib_uverbs des_s390 libdes ib_core sha3_512_s390 sha3_256_s390 sha512_s390 genwqe_card sha1_s390 crc_itu_t vfio_ccw vfio_mdev mdev vfio_iommu_type1 eadm_sch vfio zcrypt_cex4 sch_fq_codel ip_tables x_tables mlx5_core sha256_s390 sha_common pkey zcrypt rng_core autofs4 [ 9761.439335] CPU: 58 PID: 17405 Comm: sh Not tainted 5.4.0 #27 [ 9761.439336] Hardware name: IBM 3906 M04 704 (LPAR) [ 9761.439338] Krnl PSW : 0404c00180000000 00000007353f2d4c (enqueue_task_fair+0x7cc/0x9b0) [ 9761.439340] 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 [ 9761.439342] Krnl GPRS: 00000000000003e0 0400000735f500bc 000000000000002d 00000007365f4bc2 [ 9761.439343] 000000000000002c 0000000735a49388 0000000000000001 0400001f00000000 [ 9761.439344] 000003e0015ebc88 0000001fbd856c00 0000001fbd856d00 0000000000000000 [ 9761.439345] 0000001bc8a12000 0000000735d853c0 00000007353f2d48 000003e0015ebad0 [ 9761.439385] Krnl Code: 00000007353f2d3c: c020005ae9c0 larl %r2,735f500bc 00000007353f2d42: c0e5fffdc487 brasl %r14,7353ab650 #00000007353f2d48: a7f40001 brc 15,7353f2d4a >00000007353f2d4c: a7f4fcda brc 15,7353f2700 00000007353f2d50: e33073480004 lg %r3,840(%r7) 00000007353f2d56: 41b07340 la %r11,832(%r7) 00000007353f2d5a: b9040063 lgr %r6,%r3 00000007353f2d5e: b904004b lgr %r4,%r11 [ 9761.439397] Call Trace: [ 9761.439399] ([<00000007353f2d48>] enqueue_task_fair+0x7c8/0x9b0) [ 9761.439401] [<00000007353e1b48>] activate_task+0x88/0xf0 [ 9761.439403] [<00000007353e20c6>] ttwu_do_activate+0x56/0x80 [ 9761.439405] [<00000007353e3106>] try_to_wake_up+0x256/0x650 [ 9761.439408] [<000000073540353e>] swake_up_locked.part.0+0x2e/0x70 [ 9761.439409] [<0000000735403764>] swake_up_one+0x54/0x90 [ 9761.439449] [<000003ff8047be52>] kvm_vcpu_wake_up+0x52/0x80 [kvm] [ 9761.439458] [<000003ff80498e3a>] kvm_s390_vcpu_wakeup+0x2a/0x40 [kvm] [ 9761.439466] [<000003ff8049959e>] kvm_s390_idle_wakeup+0x6e/0xa0 [kvm] [ 9761.439470] [<000000073544acb4>] __hrtimer_run_queues+0x114/0x2f0 [ 9761.439472] [<000000073544b97c>] hrtimer_interrupt+0x12c/0x2b0 [ 9761.439475] [<0000000735370a1a>] do_IRQ+0xaa/0xb0 [ 9761.439480] [<0000000735d75998>] ext_int_handler+0x128/0x12c [ 9761.439485] [<00000007355abd28>] get_page_from_freelist+0x528/0x1860 [ 9761.439486] ([<00000007355abc36>] get_page_from_freelist+0x436/0x1860) [ 9761.439488] [<00000007355ae420>] __alloc_pages_nodemask+0x120/0x320 [ 9761.439492] [<00000007355cca8a>] alloc_pages_vma+0x9a/0x280 [ 9761.439494] [<0000000735588062>] wp_page_copy+0xb2/0x730 [ 9761.439495] [<000000073558b642>] do_wp_page+0xa2/0x760 [ 9761.439497] [<000000073558def2>] __handle_mm_fault+0x852/0x910 [ 9761.439498] [<000000073558e076>] handle_mm_fault+0xc6/0x180 [ 9761.439500] [<0000000735389c44>] do_protection_exception+0x164/0x4b0 [ 9761.439502] [<0000000735d7558c>] pgm_check_handler+0x1c8/0x220 [ 9761.439502] Last Breaking-Event-Address: [ 9761.439503] [<00000007353f2d48>] enqueue_task_fair+0x7c8/0x9b0 [ 9761.439504] ---[ end trace 40ea9b5f62b01ed1 ]---