Not sure if I understand the overall situation correctly, but: In the bug description I read that the issue occurs with 4.15.0-36-generic, and in comment 4 its also mentioned that it happens with 4.15.0-36-generic and 4.15.0-23-generic and again in comment 6 also on 4.15.0-15-generic (I assume all on 16.04).
But in comment 8 (according to LP 1782085) the issue doesn't happen (at least for the last 47 days) on a kernel 4.15.0-36-generic (on that particular system) - but this is the same kernel level like the one mentioned in the bug description?! Either there is something wrong with the mentioned kernel levels, or it doesn't depend on the kernel, but for example on the infrastructure?! LP 1782085 describes a situation on an LPAR system, but LP 1804149 on a zVM 7.1 guest system. Are there other differences between both systems? Can it have something todo with the underlying hypervisor? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1804149 Title: Kernel panic,Oops: 0004 ilc:3 [#1] SMP, iscsi_q_20 iscsi_xmitworker [libiscsi] Status in Ubuntu on IBM z Systems: Triaged Status in linux package in Ubuntu: Triaged Bug description: == Comment: #0 - Michael Finnegan <finne...@us.ibm.com> - 2018-11-19 14:14:40 == ---Problem Description--- Kernel panic,Oops: 0004 ilc:3 [#1] SMP, iscsi_q_20 iscsi_xmitworker [libiscsi] ---uname output--- Linux ilabg3 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:13:24 UTC 2018 s390x s390x s390x GNU/Linux Machine Type = IBM 3906 M05 7G4 (z/VM 7.1.0) ---Debugger--- A debugger is not configured Contact Information = Michael Finnegan/finne...@us.ibm.com Stack trace output: dmesg.201811161956 [1363037.322472] Unable to handle kernel pointer dereference in virtual kernel address space [1363037.322481] Failing address: 0000000000000000 TEID: 0000000000000483 [1363037.322483] Fault in home space mode while using kernel ASCE. [1363037.322486] AS:0000000000ea0007 R3:00000000f37d0007 S:00000000f37ff000 P:000000000000013d [1363037.322524] Oops: 0004 ilc:3 [#1] SMP [1363037.322529] Modules linked in: iptable_filter binfmt_misc rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache qeth_l3 qeth_l2 s390_trng ghash_s390 prng aes_s390 des_s390 des_generic sha512_s390 sha256_s390 sha1_s390 sha_common qeth vmur ccwgroup vfio_ccw vfio_mdev mdev vfio_iommu_type1 vfio sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core sunrpc iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables dm_round_robin dm_service_time crc32_vx_s390 dasd_eckd_mod zfcp qdio scsi_transport_fc dasd_fba_mod dasd_mod scsi_dh_emc scsi_dh_rdac scsi_dh_alua dm_multipath [1363037.322567] CPU: 3 PID: 37970 Comm: kworker/u128:19 Not tainted 4.15.0-36-generic #39-Ubuntu [1363037.322573] Hardware name: IBM 3906 M05 7G4 (z/VM 7.1.0) [1363037.322581] Workqueue: iscsi_q_20 iscsi_xmitworker [libiscsi] [1363037.322583] Krnl PSW : 00000000c8051cf6 00000000e49a28f4 (__iscsi_get_task+0x6/0x18 [libiscsi]) [1363037.322587] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 [1363037.322589] Krnl GPRS: 0000000000000000 0000000002923ce0 0000000000000000 0000000000000400 [1363037.322591] 000003ff80277640 0000000000000008 00000000788efc00 000003ff802777cc [1363037.322592] 000003ff8027769c 0000000000000000 0000000000000000 0000000078ce8310 [1363037.322594] 00000000f3689800 0000000078ce83a2 000003ff80272e8e 0000000002923c90 [1363037.322601] Krnl Code: 000003ff80272624: c0f4fffffcf6 brcl 15,3ff80272010 000003ff8027262a: c0f40000377b brcl 15,3ff80279520 #000003ff80272630: c00400000000 brcl 0,3ff80272630 >000003ff80272636: eb012078006a asi 120(%r2),1 000003ff8027263c: c0f400003772 brcl 15,3ff80279520 000003ff80272642: 0707 bcr 0,%r7 000003ff80272644: 0707 bcr 0,%r7 000003ff80272646: 0707 bcr 0,%r7 [1363037.322618] Call Trace: [1363037.322621] ([<000003ff80272ec6>] iscsi_xmit_task+0x86/0x138 [libiscsi]) [1363037.322625] [<000003ff8027769c>] iscsi_data_xmit+0x44c/0x548 [libiscsi] [1363037.322636] [<000003ff802777cc>] iscsi_xmitworker+0x34/0x58 [libiscsi] [1363037.322642] [<00000000001918f2>] process_one_work+0x262/0x4d8 [1363037.322644] [<0000000000191bc0>] worker_thread+0x58/0x4e8 [1363037.322648] [<0000000000198d24>] kthread+0x14c/0x168 [1363037.322652] [<00000000008e3eb2>] kernel_thread_starter+0xa/0x10 [1363037.322654] [<00000000008e3ea8>] kernel_thread_starter+0x0/0x10 [1363037.322655] Last Breaking-Event-Address: [1363037.322657] [<000003ff80272e88>] iscsi_xmit_task+0x48/0x138 [libiscsi] [1363037.322658] [1363037.322660] Kernel panic - not syncing: Fatal exception in interrupt Oops output: Oops: 0004 ilc:3 [#1] SMP *Additional Instructions for Michael Finnegan/finne...@us.ibm.com: -Post a private note with access information to the machine that the bug is occuring on. -Attach sysctl -a output output to the bug. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1804149/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
