Comment 0 for bug 1876645

Issue spotted on Eoan zVM / LPAR
It looks like this happens when running the ubunut_fan_smoke_test.

[ 1225.137764] docker0: port 1(veth2fda0c6) entered blocking state
[ 1225.137767] docker0: port 1(veth2fda0c6) entered disabled state
[ 1225.138023] device veth2fda0c6 entered promiscuous mode
[ 1225.148523] Unable to handle kernel pointer dereference in virtual kernel address space
[ 1225.148529] Failing address: 6f766c5f646f5000 TEID: 6f766c5f646f5803
[ 1225.148531] Fault in home space mode while using kernel ASCE.
[ 1225.148533] AS:000000070d94c007 R3:0000000000000024
[ 1225.148575] Oops: 0038 ilc:3 [#1] SMP
[ 1225.148578] Modules linked in: veth xt_nat vxlan ip6_udp_tunnel udp_tunnel nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype br_netfilter unix_diag sctp cuse vhost_net tap vhost_vsock vmw_vsock_virtio_transport_common vhost vsock dccp_ipv4 dccp algif_rng aegis128 aegis128l aegis256 morus1280 morus640 algif_aead anubis fcrypt khazad seed sm4_generic tea md4 michael_mic nhpoly1305 poly1305_generic rmd128 rmd160 rmd256 rmd320 sha3_generic sm3_generic streebog_generic tgr192 wp512 xxhash_generic algif_hash blowfish_generic blowfish_common cast5_generic salsa20_generic chacha_generic camellia_generic cast6_generic cast_common serpent_generic twofish_generic twofish_common algif_skcipher af_alg xt_conntrack ipt_REJECT nf_reject_ipv4 ip6table_mangle ip6table_nat nf_tables nfnetlink ip6table_filter ip6_tables iptable_mangle xt_CHECKSUM iptable_nat xt_MASQUERADE xt_tcpudp bridge iptable_filter bpfilter aufs overlay 8021q garp stp mrp llc openvswitch nsh nf_conncount nf_nat nf_conntrack
[ 1225.148622] nf_defrag_ipv6 nf_defrag_ipv4 binfmt_misc zfs(PO) zunicode(PO) zavl(PO) icp(PO) zlua(PO) zcommon(PO) znvpair(PO) spl(O) genwqe_card crc_itu_t chsc_sch eadm_sch ctcm fsm vfio_ccw vfio_mdev mdev vfio_iommu_type1 vfio sch_fq_codel nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables btrfs zstd_compress zlib_deflate raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 linear dm_service_time mlx4_ib ib_uverbs mlx4_en ptp ib_core pps_core pkey zcrypt crc32_vx_s390 ghash_s390 prng aes_s390 des_s390 qeth_l2 des_generic sha512_s390 sha256_s390 sha1_s390 sha_common mlx4_core zfcp scsi_transport_fc qeth qdio ccwgroup dasd_eckd_mod dasd_mod scsi_dh_emc scsi_dh_rdac scsi_dh_alua dm_multipath
[ 1225.148711] CPU: 4 PID: 161930 Comm: dockerd Tainted: P O 5.3.0-52-generic #46-Ubuntu
[ 1225.148714] Hardware name: IBM 2964 N63 400 (LPAR)
[ 1225.148716] Krnl PSW : 0704d00180000000 000003ff808e972a (ovl_open_realfile+0x4a/0x148 [overlay])
[ 1225.148734] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 RI:0 EA:3
[ 1225.148736] Krnl GPRS: 0000000000000064 6f766c5f646f5f6d 00000007a14ac300 00000003a5df6600
[ 1225.148738] 0000000000008000 0000000000000001 0000000300000000 0000000372e45278
[ 1225.148740] 000003ff808ea508 0000000304048000 00000005c7f32b68 000000064a2ab900
[ 1225.148742] 00000003a5df6600 000003ff808f31d8 000003ff808e971a 000003e009c0faf8
[ 1225.148749] Krnl Code: 000003ff808e971a: a59a0404 oilh %r9,1028
                          000003ff808e971e: e310f0c00004 lg %r1,192(%r15)
                         #000003ff808e9724: e31010680004 lg %r1,104(%r1)
                         >000003ff808e972a: e31010600004 lg %r1,96(%r1)
                          000003ff808e9730: b9040082 lgr %r8,%r2
                          000003ff808e9734: c21c6a656a62 cgfi %r1,1785031266
                          000003ff808e973a: b9140039 lgfr %r3,%r9
                          000003ff808e973e: e31003400004 lg %r1,832
[ 1225.148766] Call Trace:
[ 1225.148769] ([<0000000000000000>] 0x0)
[ 1225.148774] [<000003ff808ea582>] ovl_open+0x7a/0xc0 [overlay]
[ 1225.148780] [<000000070cbf2c04>] do_dentry_open+0x1fc/0x3b0
[ 1225.148784] [<000000070cc0afd2>] do_last+0x1ba/0x970
[ 1225.148786] [<000000070cc0b80e>] path_openat+0x86/0x2b8
[ 1225.148788] [<000000070cc0cea4>] do_filp_open+0x7c/0xf8
[ 1225.148791] [<000000070cbf4b5a>] do_sys_open+0x19a/0x2c8
[ 1225.148798] [<000000070d1ebca8>] system_call+0xdc/0x2c8
[ 1225.148800] Last Breaking-Event-Address:
[ 1225.148802] [<000000070d1ed210>] __s390_indirect_jump_r14+0x0/0xc
[ 1225.148805] ---[ end trace dc1913214325ab11 ]---

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-52-generic 5.3.0-52.46
ProcVersionSignature: Ubuntu 5.3.0-52.46-generic 5.3.18
Uname: Linux 5.3.0-52-generic s390x
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Sun May 3 21:51:21 2020
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:

ProcKernelCmdLine: root=UUID=d15a5734-c073-4c9a-80ad-65a914214bb8 crashkernel=196M BOOT_IMAGE=0
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-52-generic N/A
 linux-backports-modules-5.3.0-52-generic N/A
 linux-firmware 1.183.5
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)