A PPA with a patched kernel is available for further testing: https://people.canonical.com/~fheimes/lp1913442/
-- 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/1913442 Title: [Ubuntu 20.04] Problem leading IUCV service down (on s390x) Status in Ubuntu on IBM z Systems: Triaged Status in linux package in Ubuntu: Fix Released Status in linux source package in Focal: Triaged Bug description: When I deployed a Ubuntu20.04 instance with kernel version of 5.4.0-58-generic under z/VM, I saw below messages from kernel and the iucvserv program malfunctioned. Hence it caused some devices like network device configuration failure and deployment failure. Dec 14 22:02:26 ub2004img iucvserv: Receive OPNCLD4 0.0.0.1 pwd sent from IUCV client. Dec 14 22:02:26 ub2004img iucvserv: /etc/iucv_authorized_userid exists, check authorization. Dec 14 22:02:26 ub2004img iucvserv: senduserid=OPNCLD4, authuserid=OPNCLD4, len=7 Dec 14 22:02:26 ub2004img iucvserv: Current version is 0.0.0.1, upgraded version is 0.0.0.1 Dec 14 22:02:26 ub2004img iucvserv: Will execute the linux command pwd 2>&1; echo iucvcmdrc=$? sent from IUCV client. Dec 14 22:02:26 ub2004img iucvserv: result length=14, send message length=14,#012 /#012iucvcmdrc=0 Dec 14 22:02:26 ub2004img kernel: [63084.184649] ------------[ cut here ]------------ Dec 14 22:02:26 ub2004img kernel: [63084.184654] Bad or missing usercopy whitelist? Kernel memory exposure attempt detected from SLUB object 'dma-kmalloc-1k' (offset 0, size 20)! Dec 14 22:02:26 ub2004img kernel: [63084.184680] WARNING: CPU: 1 PID: 697 at mm/usercopy.c:75 usercopy_warn+0xa0/0xd0 Dec 14 22:02:26 ub2004img kernel: [63084.184681] Modules linked in: tcp_diag udp_diag raw_diag inet_diag unix_diag xt_CT iptable_raw ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_conntrack nf_conntrack nf_defr ag_ipv6 nf_defrag_ipv4 iptable_filter bpfilter af_iucv nls_utf8 isofs dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua vmur vfio_ccw vfio_mdev mdev s390_trng vfio_iommu_type1 vfio sch_fq_codel drm drm _panel_orientation_quirks i2c_core 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 pkey zcrypt crc32_vx_s390 ghash_s390 prng aes_s390 des_s390 libdes sha3_512_s390 sha3_256_s390 sha512_s390 sha256_s390 sha1_s390 sha_common dasd_fba_mod dasd_mod qeth_l2 qeth qdio ccwgroup Dec 14 22:02:26 ub2004img kernel: [63084.184718] CPU: 1 PID: 697 Comm: iucvserv Not tainted 5.4.0-58-generic #64-Ubuntu Dec 14 22:02:26 ub2004img kernel: [63084.184718] Hardware name: IBM 8561 LT1 400 (z/VM 7.1.0) Dec 14 22:02:26 ub2004img kernel: [63084.184719] Krnl PSW : 0704c00180000000 00000000b3c37a60 (usercopy_warn+0xa0/0xd0) Dec 14 22:02:26 ub2004img kernel: [63084.184721] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3 Dec 14 22:02:26 ub2004img kernel: [63084.184722] Krnl GPRS: 0000000000000004 0000000000000006 0000000000000081 0000000000000007 Dec 14 22:02:26 ub2004img kernel: [63084.184722] 0000000000000007 00000000f2ecb400 00000000b43fdc6a 000003e000000014 Dec 14 22:02:26 ub2004img kernel: [63084.184723] 0000000000000000 0000000000000014 0000000000000000 00000000b43f01f0 Dec 14 22:02:26 ub2004img kernel: [63084.184723] 00000000aae13300 00000000e9332a00 00000000b3c37a5c 000003e000987a10 Dec 14 22:02:26 ub2004img kernel: [63084.184728] Krnl Code: 00000000b3c37a50: c020003e310f larl %r2,00000000b43fdc6e Dec 14 22:02:26 ub2004img kernel: [63084.184728] 00000000b3c37a56: c0e5ffedbe85 brasl %r14,00000000b39ef760 Dec 14 22:02:26 ub2004img kernel: [63084.184728] #00000000b3c37a5c: a7f40001 brc 15,00000000b3c37a5e Dec 14 22:02:26 ub2004img kernel: [63084.184728] >00000000b3c37a60: eb6ff0c00004 lmg %r6,%r15,192(%r15) Dec 14 22:02:26 ub2004img kernel: [63084.184728] 00000000b3c37a66: 07fe bcr 15,%r14 Dec 14 22:02:26 ub2004img kernel: [63084.184728] 00000000b3c37a68: 47000700 bc 0,1792 Dec 14 22:02:26 ub2004img kernel: [63084.184728] 00000000b3c37a6c: c020003e30fa larl %r2,00000000b43fdc60 Dec 14 22:02:26 ub2004img kernel: [63084.184728] 00000000b3c37a72: a7f4ffd4 brc 15,00000000b3c37a1a Dec 14 22:02:26 ub2004img kernel: [63084.184735] Call Trace: Dec 14 22:02:26 ub2004img kernel: [63084.184736] ([<00000000b3c37a5c>] usercopy_warn+0x9c/0xd0) Dec 14 22:02:26 ub2004img kernel: [63084.184740] [<00000000b3c0fcc8>] __check_heap_object+0xd8/0x150 Dec 14 22:02:26 ub2004img kernel: [63084.184741] [<00000000b3c37bc4>] __check_object_size+0x134/0x200 Dec 14 22:02:26 ub2004img kernel: [63084.184744] [<00000000b4080a7e>] simple_copy_to_iter+0x3e/0x70 Dec 14 22:02:26 ub2004img kernel: [63084.184745] [<00000000b407fe02>] __skb_datagram_iter+0x72/0x280 Dec 14 22:02:26 ub2004img kernel: [63084.184745] [<00000000b40800be>] skb_copy_datagram_iter+0x5e/0xe0 Dec 14 22:02:26 ub2004img kernel: [63084.184747] [<000003ff805014ea>] iucv_sock_recvmsg+0xaa/0x460 [af_iucv] Dec 14 22:02:26 ub2004img kernel: [63084.184749] [<00000000b406ce36>] __sys_recvfrom+0xb6/0x140 Dec 14 22:02:26 ub2004img kernel: [63084.184750] [<00000000b406e042>] __s390x_sys_socketcall+0x222/0x350 Dec 14 22:02:26 ub2004img kernel: [63084.184753] [<00000000b4250ba2>] system_call+0x2a6/0x2c8 Dec 14 22:02:26 ub2004img kernel: [63084.184753] Last Breaking-Event-Address: Dec 14 22:02:26 ub2004img kernel: [63084.184754] [<00000000b3c37a5c>] usercopy_warn+0x9c/0xd0 Dec 14 22:02:26 ub2004img kernel: [63084.184754] ---[ end trace b0232fe5536a773d ]--- Dec 14 22:02:26 ub2004img iucvserv: Receive OPNCLD4 0.0.0.1 ls /etc/*-release sent from IUCV client. Dec 14 22:02:26 ub2004img iucvserv: /etc/iucv_authorized_userid exists, check authorization. Dec 14 22:02:26 ub2004img iucvserv: senduserid=OPNCLD4, authuserid=OPNCLD4, len=7 Dec 14 22:02:26 ub2004img iucvserv: Current version is 0.0.0.1, upgraded version is 0.0.0.1 Dec 14 22:02:26 ub2004img iucvserv: Will execute the linux command ls /etc/*-release 2>&1; echo iucvcmdrc=$? sent from IUCV client. Dec 14 22:02:26 ub2004img iucvserv: result length=45, send message length=45,#012 /etc/lsb-release#012/etc/os-release#012iucvcmdrc=0 Dec 14 22:02:26 ub2004img iucvserv: Receive OPNCLD4 0.0.0.1 cat /etc/os-release sent from IUCV client. Dec 14 22:02:26 ub2004img iucvserv: /etc/iucv_authorized_userid exists, check authorization. Dec 14 22:02:26 ub2004img iucvserv: senduserid=OPNCLD4, authuserid=OPNCLD4, len=7 Dec 14 22:02:26 ub2004img iucvserv: Current version is 0.0.0.1, upgraded version is 0.0.0.1 But I didn't see such problem with kernel version 5.4.0-40-generic #44-Ubuntu when I did the same operation. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1913442/+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
