Public bug reported:
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.
** Affects: ubuntu-z-systems
Importance: High
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: Triaged
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Frank Heimes (fheimes)
Status: New
** Tags: architecture-s39064 bugnameltc-191054 severity-high
targetmilestone-inin---
** Tags added: architecture-s39064 bugnameltc-191054 severity-high
targetmilestone-inin---
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1913442
Title:
[Ubuntu 20.04] Problem leading IUCV service down (on s390x)
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