Oracle VM Server 3.4.5 – Kernel Memory Leak

 

Oracle VM Server instability on version 3.4.5 due to a Oracle Unbreakable Enterprise Kernel (UEK)  bug.

The kernel version 4.1.12-124.14.5.el6uek.x86_64  has introduced a memory leak of the network module i40e

 

Here is reported the backtraces collected after the problem from the /var/log/messages:

Dec 12 07:06:30 efuovs02 kernel: [1508192.885203] ntpd invoked oom-killer: gfp_mask=0x200da, order=0, oom_score_adj=0
Dec 12 07:06:30 efuovs02 kernel: [1508192.885208] ntpd cpuset=/ mems_allowed=0
Dec 12 07:06:30 efuovs02 kernel: [1508192.885217] CPU: 3 PID: 4751 Comm: ntpd Not tainted 4.1.12-124.14.5.el6uek.x86_64 #2
Dec 12 07:06:30 efuovs02 kernel: [1508192.885221] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 02/14/2018
Dec 12 07:06:30 efuovs02 kernel: [1508192.885224]  0000000000000000 ffff8804484cf678 ffffffff816e4bdb ffff88044d44aa00
Dec 12 07:06:30 efuovs02 kernel: [1508192.885230]  0000000000000000 ffff8804484cf708 ffffffff816e32d1 01ff8804484cf688
Dec 12 07:06:30 efuovs02 kernel: [1508192.885235]  ffff8804484cf718 ffff8804484cf6c8 ffffffff811fc561 ffff8804484cf800
Dec 12 07:06:30 efuovs02 kernel: [1508192.885241] Call Trace:
Dec 12 07:06:30 efuovs02 kernel: [1508192.885251]  [<ffffffff816e4bdb>] dump_stack+0x63/0x81
Dec 12 07:06:30 efuovs02 kernel: [1508192.885256]  [<ffffffff816e32d1>] dump_header+0x7f/0x1f3
Dec 12 07:06:30 efuovs02 kernel: [1508192.885264]  [<ffffffff811fc561>] ? vmpressure+0x21/0x90
Dec 12 07:06:30 efuovs02 kernel: [1508192.885272]  [<ffffffff8118e53c>] oom_kill_process+0x1cc/0x3c0
Dec 12 07:06:30 efuovs02 kernel: [1508192.885283]  [<ffffffff8108de0e>] ? has_capability_noaudit+0x1e/0x30
Dec 12 07:06:31 efuovs02 kernel: [1508192.885288]  [<ffffffff8118eaab>] __out_of_memory+0x31b/0x530
Dec 12 07:06:31 efuovs02 kernel: [1508192.885294]  [<ffffffff8118ee5b>] out_of_memory+0x5b/0x80
Dec 12 07:06:31 efuovs02 kernel: [1508192.885300]  [<ffffffff81194d42>] __alloc_pages_nodemask+0x952/0xab0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885307]  [<ffffffff811de28d>] alloc_pages_vma+0xbd/0x260
Dec 12 07:06:31 efuovs02 kernel: [1508192.885311]  [<ffffffff8118a59e>] ? find_get_entry+0x1e/0xc0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885317]  [<ffffffff811ce6bd>] read_swap_cache_async+0xed/0x170
Dec 12 07:06:31 efuovs02 kernel: [1508192.885322]  [<ffffffff811ce82d>] swapin_readahead+0xed/0x190
Dec 12 07:06:31 efuovs02 kernel: [1508192.885328]  [<ffffffff811bbfe0>] handle_mm_fault+0x12d0/0x1770
Dec 12 07:06:31 efuovs02 kernel: [1508192.885335]  [<ffffffff8121d910>] ? poll_select_copy_remaining+0x130/0x130
Dec 12 07:06:31 efuovs02 kernel: [1508192.885340]  [<ffffffff8106d57f>] __do_page_fault+0x1af/0x480
Dec 12 07:06:31 efuovs02 kernel: [1508192.885346]  [<ffffffff816f2c1c>] ? page_fault+0xcc/0x120
Dec 12 07:06:31 efuovs02 kernel: [1508192.885350]  [<ffffffff8106d87f>] do_page_fault+0x2f/0x80
Dec 12 07:06:31 efuovs02 kernel: [1508192.885354]  [<ffffffff816f2be4>] ? page_fault+0x94/0x120
Dec 12 07:06:31 efuovs02 kernel: [1508192.885359]  [<ffffffff816f2bdd>] ? page_fault+0x8d/0x120
Dec 12 07:06:31 efuovs02 kernel: [1508192.885363]  [<ffffffff816f2bd6>] ? page_fault+0x86/0x120
Dec 12 07:06:31 efuovs02 kernel: [1508192.885367]  [<ffffffff816f2c5f>] page_fault+0x10f/0x120
Dec 12 07:06:31 efuovs02 kernel: [1508192.885375]  [<ffffffff813316c5>] ? copy_user_enhanced_fast_string+0x5/0x10
Dec 12 07:06:31 efuovs02 kernel: [1508192.885379]  [<ffffffff8121d7d1>] ? set_fd_set+0x21/0x30
Dec 12 07:06:31 efuovs02 kernel: [1508192.885384]  [<ffffffff8121e5aa>] core_sys_select+0x1fa/0x2f0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885392]  [<ffffffff810f8fc3>] ? ntp_notify_cmos_timer+0x23/0x30
Dec 12 07:06:31 efuovs02 kernel: [1508192.885396]  [<ffffffff810f8a1d>] ? do_adjtimex+0xed/0x100
Dec 12 07:06:31 efuovs02 kernel: [1508192.885402]  [<ffffffff810ed3ac>] ? SYSC_adjtimex+0x4c/0x80
Dec 12 07:06:31 efuovs02 kernel: [1508192.885410]  [<ffffffff810209e9>] ? read_tsc+0x9/0x10
Dec 12 07:06:31 efuovs02 kernel: [1508192.885414]  [<ffffffff810f68cb>] ? ktime_get_ts64+0x4b/0x110
Dec 12 07:06:31 efuovs02 kernel: [1508192.885419]  [<ffffffff8121e74b>] SyS_select+0xab/0x100
Dec 12 07:06:31 efuovs02 kernel: [1508192.885424]  [<ffffffff816ed451>] ? system_call_after_swapgs+0xdb/0x18c
Dec 12 07:06:31 efuovs02 kernel: [1508192.885428]  [<ffffffff816ed51a>] system_call_fastpath+0x18/0xd4
Dec 12 07:06:31 efuovs02 kernel: [1508192.885457] Mem-Info:
Dec 12 07:06:31 efuovs02 kernel: [1508192.885469] active_anon:1452 inactive_anon:1426 isolated_anon:65
Dec 12 07:06:31 efuovs02 kernel: [1508192.885469]  active_file:4559 inactive_file:873 isolated_file:0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885469]  unevictable:1547 dirty:20 writeback:31 unstable:0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885469]  slab_reclaimable:6776 slab_unreclaimable:8649
Dec 12 07:06:31 efuovs02 kernel: [1508192.885469]  mapped:3007 shmem:0 pagetables:1705 bounce:0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885469]  free:33536 free_pcp:918 free_cma:0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885483] Node 0 DMA free:15740kB min:60kB low:72kB high:84kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15988kB managed:15900kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Dec 12 07:06:31 efuovs02 kernel: [1508192.885499] lowmem_reserve[]: 0 2661 15921 15921
Dec 12 07:06:31 efuovs02 kernel: [1508192.885508] Node 0 DMA32 free:64064kB min:11076kB low:13844kB high:16612kB active_anon:5912kB inactive_anon:5876kB active_file:112kB inactive_file:52kB unevictable:836kB isolated(anon):256kB isolated(file):0kB present:2781336kB managed:2751088kB mlocked:836kB dirty:0kB writeback:0kB mapped:668kB shmem:0kB slab_reclaimable:4792kB slab_unreclaimable:6452kB kernel_stack:912kB pagetables:1692kB unstable:0kB bounce:0kB free_pcp:1156kB local_pcp:248kB free_cma:0kB writeback_tmp:0kB pages_scanned:619296 all_unreclaimable? yes
Dec 12 07:06:31 efuovs02 kernel: [1508192.885524] lowmem_reserve[]: 0 0 13260 13260
Dec 12 07:06:31 efuovs02 kernel: [1508192.885532] Node 0 Normal free:54340kB min:54392kB low:67988kB high:81584kB active_anon:0kB inactive_anon:0kB active_file:18124kB inactive_file:3440kB unevictable:5352kB isolated(anon):4kB isolated(file):0kB present:13979888kB managed:13534768kB mlocked:5352kB dirty:80kB writeback:124kB mapped:11360kB shmem:0kB slab_reclaimable:22312kB slab_unreclaimable:28144kB kernel_stack:2880kB pagetables:5128kB unstable:0kB bounce:0kB free_pcp:2516kB local_pcp:572kB free_cma:0kB writeback_tmp:0kB pages_scanned:129384 all_unreclaimable? yes
Dec 12 07:06:31 efuovs02 kernel: [1508192.885546] lowmem_reserve[]: 0 0 0 0
Dec 12 07:06:31 efuovs02 kernel: [1508192.885551] Node 0 DMA: 1*4kB (U) 1*8kB (U) 1*16kB (U) 1*32kB (U) 1*64kB (U) 0*128kB 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (R) 3*4096kB (M) = 15740kB
Dec 12 07:06:31 efuovs02 kernel: [1508192.885573] Node 0 DMA32: 143*4kB (UE) 111*8kB (UEM) 209*16kB (UE) 140*32kB (UE) 94*64kB (UEM) 57*128kB (UEM) 28*256kB (UEM) 7*512kB (UEM) 4*1024kB (EM) 9*2048kB (MR) 2*4096kB (MR) = 64068kB
Dec 12 07:06:31 efuovs02 kernel: [1508192.885596] Node 0 Normal: 8736*4kB (UEM) 1360*8kB (UEM) 208*16kB (UEM) 32*32kB (UE) 2*64kB (UE) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB (R) = 54400kB
Dec 12 07:06:31 efuovs02 kernel: [1508192.885615] 8002 total pagecache pages
Dec 12 07:06:31 efuovs02 kernel: [1508192.885618] 1494 pages in swap cache
Dec 12 07:06:31 efuovs02 kernel: [1508192.885621] Swap cache stats: add 3717250313, delete 3717248819, find 2895172777/5168362256
Dec 12 07:06:31 efuovs02 kernel: [1508192.885624] Free swap  = 4129656kB
Dec 12 07:06:31 efuovs02 kernel: [1508192.885626] Total swap = 4194300kB
Dec 12 07:06:31 efuovs02 kernel: [1508192.885628] 4194303 pages RAM
Dec 12 07:06:31 efuovs02 kernel: [1508192.885630] 0 pages HighMem/MovableOnly
Dec 12 07:06:31 efuovs02 kernel: [1508192.885632] 118864 pages reserved
Dec 12 07:06:31 efuovs02 kernel: [1508192.885634] 0 pages cma reserved
Dec 12 07:06:31 efuovs02 kernel: [1508192.885636] 0 pages hwpoisoned
Dec 12 07:06:31 efuovs02 kernel: [1508192.885638] [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds swapents oom_score_adj name
Dec 12 07:06:31 efuovs02 kernel: [1508192.885650] [  983]     0   983     2677      266      11       3      111         -1000 udevd
Dec 12 07:06:31 efuovs02 kernel: [1508192.885657] [ 3783]     0  3783   125771     1414      48       5        0         -1000 multipathd
Dec 12 07:06:31 efuovs02 kernel: [1508192.885662] [ 4334]     0  4334     6944      399      15       3      108         -1000 auditd
Dec 12 07:06:31 efuovs02 kernel: [1508192.885667] [ 4368]     0  4368    61281      438      23       3      377             0 rsyslogd
Dec 12 07:06:31 efuovs02 kernel: [1508192.885671] [ 4383]     0  4383     2832      352      11       3      164             0 irqbalance
Dec 12 07:06:31 efuovs02 kernel: [1508192.885675] [ 4412]    32  4412     4760      397      16       3       74             0 rpcbind
Dec 12 07:06:31 efuovs02 kernel: [1508192.885680] [ 4436]    29  4436     5853      354      17       3      112             0 rpc.statd
Dec 12 07:06:31 efuovs02 kernel: [1508192.885684] [ 4481]     0  4481     5790        0      15       3       50             0 rpc.idmapd
Dec 12 07:06:31 efuovs02 kernel: [1508192.885689] [ 4522]     0  4522     2106      268      12       5       28             0 fcoemon
Dec 12 07:06:31 efuovs02 kernel: [1508192.885694] [ 4537]    81  4537     5373        0      15       3       62             0 dbus-daemon
Dec 12 07:06:31 efuovs02 kernel: [1508192.885698] [ 4612]     0  4612     1030      310       9       5       41             0 o2hbmonitor
Dec 12 07:06:31 efuovs02 kernel: [1508192.885702] [ 4632]     0  4632    47286      410      51       3      221             0 cupsd
Dec 12 07:06:31 efuovs02 kernel: [1508192.885706] [ 4692]     0  4692     1039      323       9       5       30             0 acpid
Dec 12 07:06:31 efuovs02 kernel: [1508192.885711] [ 4718]     0  4718     1580      211       8       5       27             0 mcelog
Dec 12 07:06:31 efuovs02 kernel: [1508192.885715] [ 4738]     0  4738    16579      304      34       3      185         -1000 sshd
Dec 12 07:06:32 efuovs02 kernel: [1508192.885720] [ 4751]    38  4751     6644      567      18       3      162             0 ntpd
Dec 12 07:06:32 efuovs02 kernel: [1508192.885724] [ 4796]     0  4796     3235      331      15       6      143             0 xenstored
Dec 12 07:06:32 efuovs02 kernel: [1508192.885729] [ 4803]     0  4803    21126      307      21       6       69             0 xenconsoled
Dec 12 07:06:32 efuovs02 kernel: [1508192.885733] [ 4807]     0  4807    53362      393      65       3      525             0 qemu-system-i38
Dec 12 07:06:32 efuovs02 kernel: [1508192.885737] [ 4910]     0  4910    20252      478      45       3      239             0 master
Dec 12 07:06:32 efuovs02 kernel: [1508192.885742] [ 4922]    89  4922    20315      486      46       3      238             0 qmgr
Dec 12 07:06:32 efuovs02 kernel: [1508192.885746] [ 4930]     0  4930    29223      395      16       3      171             0 crond
Dec 12 07:06:32 efuovs02 kernel: [1508192.885750] [ 5036]     0  5036     5291      283      15       3       67             0 atd
Dec 12 07:06:32 efuovs02 kernel: [1508192.885755] [ 5345]     0  5345    38468      249      14       5       30             0 osmdaemon
Dec 12 07:06:32 efuovs02 kernel: [1508192.885759] [ 5366]     0  5366    85597      650      61       7     1514             0 python
Dec 12 07:06:32 efuovs02 kernel: [1508192.885764] [ 5378]     0  5378    24079      467      27       6      113             0 ovmport
Dec 12 07:06:32 efuovs02 kernel: [1508192.885768] [ 5390]     0  5390    60521      410      65       6      920             0 ovmwatch
Dec 12 07:06:32 efuovs02 kernel: [1508192.885772] [ 5405]     0  5405   208969      656      87       7     1558             0 python
Dec 12 07:06:32 efuovs02 kernel: [1508192.885777] [ 5772]     0  5772   177327     1015      89       6     1775             0 python
Dec 12 07:06:32 efuovs02 kernel: [1508192.885782] [ 5789]     0  5789    49154      741      71       7     1366             0 python
Dec 12 07:06:32 efuovs02 kernel: [1508192.885786] [ 5831]     0  5831    82559      555      70       6     1491             0 devmon
Dec 12 07:06:32 efuovs02 kernel: [1508192.885790] [ 5901]     0  5901     1031      292       9       5       18             0 mingetty
Dec 12 07:06:32 efuovs02 kernel: [1508192.885794] [ 5903]     0  5903     1031      292       8       5       19             0 mingetty
Dec 12 07:06:32 efuovs02 kernel: [1508192.885798] [ 5905]     0  5905     1031      292       9       5       19             0 mingetty
Dec 12 07:06:32 efuovs02 kernel: [1508192.885802] [ 5907]     0  5907     1031      292       9       5       19             0 mingetty
Dec 12 07:06:32 efuovs02 kernel: [1508192.885806] [ 5909]     0  5909     1031      292       9       5       19             0 mingetty
Dec 12 07:06:32 efuovs02 kernel: [1508192.885812] [26455]     0 26455    11091      458      44       5      108             0 socat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885816] [27087]     0 27087    11091      458      45       5      108             0 socat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885820] [27845]     0 27845    11091      458      44       5      109             0 socat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885825] [27996]     0 27996    11091      458      44       5      107             0 socat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885829] [14189]     0 14189    11091      458      44       5      109             0 socat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885833] [16371]     0 16371    11091      458      44       5      109             0 socat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885838] [14238]     0 14238     2676      256      11       3      129         -1000 udevd
Dec 12 07:06:32 efuovs02 kernel: [1508192.885842] [14374]     0 14374     2676      240      11       3      119         -1000 udevd
Dec 12 07:06:32 efuovs02 kernel: [1508192.885846] [15869]     0 15869    22957      931      62       6     1730             0 python
Dec 12 07:06:32 efuovs02 kernel: [1508192.885851] [16935]     0 16935    28695     2029      16       5       64             0 OSWatcher
Dec 12 07:06:32 efuovs02 kernel: [1508192.885855] [ 5867]    89  5867    20272     1250      45       3      229             0 pickup
Dec 12 07:06:32 efuovs02 kernel: [1508192.885860] [ 8948]     0  8948    27070      682      17       5       71             0 vmsub
Dec 12 07:06:32 efuovs02 kernel: [1508192.885864] [ 8951]     0  8951    27070      675      17       5       77             0 mpsub
Dec 12 07:06:32 efuovs02 kernel: [1508192.885868] [ 8953]     0  8953     1581      328      11       5       42             0 vmstat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885872] [ 8958]     0  8958    27070      659      17       6       41             0 iosub
Dec 12 07:06:32 efuovs02 kernel: [1508192.885876] [ 8959]     0  8959    25258      441      13       5       46             0 mpstat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885880] [ 8966]     0  8966    25261      420      11       5       19             0 iostat
Dec 12 07:06:32 efuovs02 kernel: [1508192.885884] [ 8971]     0  8971    27070      679      17       5        0             0 xtop
Dec 12 07:06:32 efuovs02 kernel: [1508192.885888] [ 8976]     0  8976    27070      695      17       5        0             0 psmemsub
Dec 12 07:06:32 efuovs02 kernel: [1508192.885892] [ 8977]     0  8977     3771      483      20       5        3             0 top
Dec 12 07:06:32 efuovs02 kernel: [1508192.885896] [ 8980]     0  8980    27070      680      17       5        0             0 oswsub
Dec 12 07:06:32 efuovs02 kernel: [1508192.885901] [ 8985]     0  8985    28695     1794      15       5      131             0 OSWatcher
Dec 12 07:06:32 efuovs02 kernel: [1508192.885905] [ 8986]     0  8986    27564      523      19       5        8             0 ps
Dec 12 07:06:32 efuovs02 kernel: [1508192.885909] [ 8987]     0  8987    27070       54      12       5        0             0 psmemsub
Dec 12 07:06:32 efuovs02 kernel: [1508192.885913] [ 8988]     0  8988    27070       52      11       5        0             0 oswsub
Dec 12 07:06:32 efuovs02 kernel: [1508192.885917] Out of memory: Kill process 5772 (python) score 0 or sacrifice child
Dec 12 07:06:32 efuovs02 kernel: [1508192.886216] Killed process 5772 (python) total-vm:709308kB, anon-rss:0kB, file-rss:4060kB

 

 

How to fix the OVS Kernel Memory Leak

Download the following kernel version which includes the memoy leak fix for the i40e module:  link to Oracle RPM repository

kernel-uek-4.1.12-124.21.1.el6uek.x86_64.rpm
kernel-uek-firmware-4.1.12-124.21.1.el6uek.noarch.rpm


[root@efuovs02 new_Kernel]# rpm -qp --changelog kernel-uek-4.1.12-124.21.1.el6uek.x86_64.rpm | grep -B 3 28228724
warning: kernel-uek-4.1.12-124.21.1.el6uek.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
* Tue Oct 30 2018 Brian Maly <brian.maly@oracle.com> [4.1.12-124.20.8.el6uek] 
- scsi: lpfc: devloss timeout race condition caused null pointer reference (James Smart) [Orabug: 27994179] 
- scsi: qla2xxx: Fix race condition between iocb timeout and initialisation (Ben Hutchings) [Orabug: 28013813] 
- i40e: Add programming descriptors to cleaned_count (Alexander Duyck) [Orabug: 28228724] 
- i40e: Fix memory leak related filter programming status (Alexander Duyck) [Orabug: 28228724]

 

 

Install the new OVS Kernel

Using the steps reported below, the new kernel has been installed on all OVS servers of the farm.

[root@efuovs02 new_Kernel]# rpm -ivh kernel*
warning: kernel-uek-4.1.12-124.21.1.el6uek.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
Preparing... ########################################### [100%]
1:kernel-uek-firmware ########################################### [ 50%]
2:kernel-uek ########################################### [100%]
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.1.12-124.21.1.el6uek.x86_64
Found linux image: /boot/vmlinuz-4.1.12-124.14.5.el6uek.x86_64
Found initrd image: /boot/initramfs-4.1.12-124.14.5.el6uek.x86_64.img
done
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.1.12-124.21.1.el6uek.x86_64
Found initrd image: /boot/initramfs-4.1.12-124.21.1.el6uek.x86_64.img
Found linux image: /boot/vmlinuz-4.1.12-124.14.5.el6uek.x86_64
Found initrd image: /boot/initramfs-4.1.12-124.14.5.el6uek.x86_64.img
done
[root@efuovs02 new_Kernel]#

....

[root@efuovs02 new_Kernel]# reboot

[root@efuovs02 ~]# uname -a
Linux efuovs02 4.1.12-124.21.1.el6uek.x86_64 #2 SMP Tue Nov 6 13:31:13 PST 2018 x86_64 x86_64 x86_64 GNU/Linux

 

 

 

 

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RHEL 7.4 fails to mount ACFS File System due to KMOD package

After a fresh OS installation or an upgrade to RHEL 7.4, any attempt to install ACFS drivers will fail with the following message: “ACFS-9459 ADVM/ACFS is not supported on this OS version”

The error persists even if the Oracle Grid Infrastructure software includes the  Patch 26247490: 12.2 ACFS MODULE ERRORS & CRASH DURING MODULE LOAD & UNLOAD WITH OL7U4 RHCK.

 

This problem has been identified by Oracle with  BUG 26320387 – 7.4 kmod weak-modules not checking kABI compatibility correctly

And by Red Hat  Bugzilla bug:  1477073 – 7.4 kmod weak-modules –dry-run changed output format missing ‘is compatible’ messages.

root@oel7node06:/u01/app/12.2.0.1/grid/crs/install# /u01/app/12.2.0.1/grid/bin/acfsroot install
ACFS-9459: ADVM/ACFS is not supported on this OS version: '3.10.0-514.6.1.el7.x86_64'

root@oel7node06:~# /sbin/lsmod | grep oracle
oracleadvm 776830 7
oracleoks 654476 1 oracleadvm
oracleafd 205543 1

 

The current Workaround consists in downgrade the version of the kmod  RPM to  kmod-20-9.el7.x86_64.

root@oel7node06:~# yum downgrade kmod-20-9.el7

 

After the package downgrade the ACFS drivers are correcly loaded:

root@oel7node06:~# /sbin/lsmod | grep oracle
oracleacfs 4597925 2
oracleadvm 776830 8
oracleoks 654476 2 oracleacfs,oracleadvm
oracleafd 205543 1

 


 

 

 

ASM Filter Driver (ASMFD)

 

ASM Filter Driver is a Linux kernel module introduced in 12c R1. It resides in the I/O path of the Oracle ASM disks providing the following features:

  • Rejecting all non-Oracle I/O write requests to ASM Disks.
  • Device name persistency.
  • Node level fencing without reboot.

 

In 12c R2 ASMFD can be enabled from the GUI interface of the Grid Infrastructure installation, as shown on this post GI 12c R2 Installation at the step #8 “Create ASM Disk Group”.

Once ASM Filter Driver is in use, similarly to ASMLib the disks are managed using the ASMFD Label Name.

 

Here few examples about the implementation of ASM Filter Driver.

--How to create an ASMFD label in SQL*Plus
SQL> Alter system label set 'DATA1' to '/dev/mapper/mpathak';

System altered.


--How to create an ASM Disk Group with ASMFD
CREATE DISKGROUP DATA_DG EXTERNAL REDUNDANCY DISK 'AFD:DATA1' SIZE 30720M
ATTRIBUTE 'SECTOR_SIZE'='512','LOGICAL_SECTOR_SIZE'='512','compatible.asm'='12.2.0.1',
'compatible.rdbms'='12.2.0.1','compatible.advm'='12.2.0.1','au_size'='4M';

Diskgroup created.

 

ASM Filter Driver can also be managed from the ASM command line utility ASMCMD

--Check ASMFD status
ASMCMD> afd_state
ASMCMD-9526: The AFD state is 'LOADED' and filtering is 'ENABLED' on host 'oel7node06.localdomain'


--List ASM Disks where ASMFD is enabled
ASMCMD> afd_lsdsk
--------------------------------------------------------------------------------
Label                    Filtering                Path
================================================================================
DATA1                      ENABLED                /dev/mapper/mpathak
DATA2                      ENABLED                /dev/mapper/mpathan
DATA3                      ENABLED                /dev/mapper/mpathw
DATA4                      ENABLED                /dev/mapper/mpathac
GIMR1                      ENABLED                /dev/mapper/mpatham
GIMR2                      ENABLED                /dev/mapper/mpathaj
GIMR3                      ENABLED                /dev/mapper/mpathal
GIMR4                      ENABLED                /dev/mapper/mpathaf
GIMR5                      ENABLED                /dev/mapper/mpathai
RECO3                      ENABLED                /dev/mapper/mpathy
RECO1                      ENABLED                /dev/mapper/mpathab
RECO2                      ENABLED                /dev/mapper/mpathx
ASMCMD>


--How to remove an ASMFD label in ASMCMD
ASMCMD> afd_unlabel DATA4

 

 


 

Linux for DBA: Basic “vi” Editor Tutorial

 

UNIX/Linux “vi” is a very powerful text editor, unfortunately at the beginning the utilization can be difficult. To help our memory, I wrote this post.

This is NOT an exhaustive guide, but a concentrate of the most useful commands and options.

 

vi Operation Modes:

Command mode: allows to execute administrative tasks (run command, move cursor, serch/replace string, save, etc.). This is the default mode when started.
When Insert mode is active press ESC to revert to Command mode.

Insert mode:  enables to write into the file. To switch to Insert mode you simply type i.

 

To open a file in edit mode:

# vi filename

 

Basic Moving commands

Enable Command mode (pressing ESC twice)
j  -- Cursor down one line
k  -- Cursor up one line
h  -- Cursor left one line
l  -- Cursor right one line
Multiple lines/columns move ex.: 5h -- Cursor 5 move left

$   -- Cursor at the end of the line.
0   -- Cursor at the beginning of the line. Same than |
b   -- Cursor at the next word.
w   -- Cursor at the next word.
G   -- Cursor at the end of the file.
1G  -- Cursor at the beginning of the line.
:,4 -- Cursor at the 4th line.

 

Basic Editing commands

Enable Insert mode (pressing i)

a  -- Insert text after the cursor location. 
A  -- Insert text at the end of the line. 
i  -- Insert text before the cursor location. 
I  -- Insert text at the beginning of the line. 
o  -- Insert a new line below the cursor location. 
O  -- Insert a new line above the cursor location.
dd -- Delete the current line.
x  -- Delete the character under the cursor location.
cw -- Change the word under the cursor location.
r  -- Replace the character under the cursor location.
R  -- Replace multiple characters starting from the cursor location. ESC to stop the replacement.
yy -- Copy the current line.
yw -- Copy the current word.
p  -- Paste the copied text before the current cursor location
P  -- Paste the copied text after the current cursor location

 

Basic Search and  Replace options

Enable Command mode (pressing ESC twice)

:set ic -- Ingnore case when searching.
:set nu -- Disply line number on the left side.
:%s/<search_string>/<replacement_string>/g -- Global search and replace

 

Exiting from vi

:q  -- Exit without Saving
:q! -- Force Exit without Saving
:w  -- Save the file
:wq -- Save & Exit

 

 

Linux for DBA: Red Hat 7 removed and deprecated few commands

 

Linux Red Hat 7 and derived distributions have removed and deprecated few commands. Among them netstat and lsof,  which are popular between DBAs.

This post shows how to obtain the network information in compliance with the new OS commands.

 

NETSTAT

netstat – is now considered obsolete, and it has been replaced by ss:

root@oel7qa01:~$ ss -t
State       Recv-Q Send-Q       Local Address:Port           Peer Address:Port 
ESTAB       0      0            192.168.1.117:54360          192.0.78.23:https 
ESTAB       0      0            192.168.1.117:48538          198.252.206.25:https 
ESTAB       0      0            192.168.1.117:42744          162.125.18.133:https 
ESTAB       0      0            127.0.0.1:38106              127.0.0.1:52828 
ESTAB       0      0            192.168.1.117:54008          192.0.78.23:https 
CLOSE-WAIT  1      0            192.168.1.117:60054          51.2xx.195.xx:https 
ESTAB       0      0            192.168.1.117:47904          198.2xx.202.xx:https 
CLOSE-WAIT  32     0            192.168.1.117:56724          108.1xx.172.xxx:https 
CLOSE-WAIT  32     0            192.168.1.117:47050          54.xx.201.xxx:https 
ESTAB       0      0            127.0.0.1:52828              127.0.0.1:38106 
CLOSE-WAIT  32     0            192.168.1.117:44728          108.1xx.xxx.6x:https 
ESTAB       0      0            192.168.1.117:41848          195.xxx.2xx.xxx:https 
ESTAB       0      0            192.168.7.50:41268           192.168.7.60:ssh 
ESTAB       0      0            2a02:1203:ecb0:7b80:58d9:f6e5:90d9:f266:53060 2a00:1450:400e:800::2003:https 
ESTAB       0      0            2a02:1203:ecb0:7b80:58d9:f6e5:90d9:f266:37978 2a00:1450:400a:804::200e:https 
ESTAB       0      0            2a02:1203:ecb0:7b80:58d9:f6e5:90d9:f266:51682 2a00:1450:400a:804::2003:https

 

The netstat -r information is now provided by the command ip route:

--Until Red Hat 6
[root@oel7node00 ~]# netstat -r
Kernel IP routing table
Destination     Gateway     Genmask        Flags  MSS Window irtt Iface
default         gateway     0.0.0.0        UG       0 0         0 enp0s8
default         gateway     0.0.0.0        UG       0 0         0 enp0s3
10.0.2.0        0.0.0.0     255.255.255.0  U        0 0         0 enp0s3
172.31.100.0    0.0.0.0     255.255.255.0  U        0 0         0 enp0s9
192.168.7.0     0.0.0.0     255.255.255.0  U        0 0         0 enp0s8
192.168.200.0   0.0.0.0     255.255.255.0  U        0 0         0 enp0s10


--As of Red Hat 7
[root@oel7node00 ~]# ip route
default via 192.168.7.50 dev enp0s8 proto static metric 100 
default via 10.0.2.2 dev enp0s3 proto static metric 101 
10.0.2.0/24 dev enp0s3 proto kernel scope link src 10.0.2.15 metric 100 
172.31.100.0/24 dev enp0s9 proto kernel scope link src 172.31.100.10 metric 100 
192.168.7.0/24 dev enp0s8 proto kernel scope link src 192.168.7.60 metric 100 
192.168.200.0/24 dev enp0s10 proto kernel scope link src 192.168.200.10 metric 100 

 

The netstat -i information is now provided by the command ip route:

--Until Red Hat 6
[root@oel7node00 ~]# netstat -i
Kernel Interface table
Iface     MTU    RX-OK RX-ERR RX-DRP RX-OVR   TX-OK TX-ERR TX-DRP TX-OVR Flg
enp0s3   1500       66      0      0 0           72      0      0      0 BMRU
enp0s8   1500     1201      0      0 0          687      0      0      0 BMRU
enp0s9   1500        2      0      0 0            2      0      0      0 BMRU
enp0s10  1500        2      0      0 0            7      0      0      0 BMRU
lo      65536        0      0      0 0            0      0      0      0 LRU


--As of Red Hat 7
[root@oel7node00 ~]# ip -s link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT 
 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
 RX: bytes packets errors dropped overrun mcast 
 0         0       0      0       0       0 
 TX: bytes packets errors dropped carrier collsns 
 0         0       0      0       0       0 
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
 link/ether 08:00:27:4c:63:1b brd ff:ff:ff:ff:ff:ff
 RX: bytes packets errors dropped overrun mcast 
 5860      66      0      0       0       0 
 TX: bytes packets errors dropped carrier collsns 
 5662      72      0      0       0       0 
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
 link/ether 08:00:27:2b:ca:66 brd ff:ff:ff:ff:ff:ff
 RX: bytes packets errors dropped overrun mcast 
 131645    1237    0      0       0       0 
 TX: bytes packets errors dropped carrier collsns 
 223396    704     0      0       0       0 
4: enp0s9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
 link/ether 08:00:27:cc:fb:2e brd ff:ff:ff:ff:ff:ff
 RX: bytes packets errors dropped overrun mcast 
 120        2      0      0       0       0 
 TX: bytes packets errors dropped carrier collsns 
 120       2       0      0       0       0 
5: enp0s10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
 link/ether 08:00:27:6f:7e:47 brd ff:ff:ff:ff:ff:ff
 RX: bytes packets errors dropped overrun mcast 
 120       2       0      0       0       0 
 TX: bytes packets errors dropped carrier collsns 
 558       7       0      0       0       0

 

The netstat -g information is now provided by the command ip maddr:

--Until Red Hat 6
[root@oel7node00 ~]# netstat -g
IPv6/IPv4 Group Memberships
Interface RefCnt Group
--------------- ------ ---------------------
lo 1 all-systems.mcast.net
enp0s3 1 all-systems.mcast.net
enp0s8 1 all-systems.mcast.net
enp0s9 1 all-systems.mcast.net
enp0s10 1 all-systems.mcast.net
lo 1 ff02::1
lo 1 ff01::1
enp0s3 1 ff02::1
enp0s3 1 ff01::1
enp0s8 1 ff02::1
enp0s8 1 ff01::1
enp0s9 1 ff02::1
enp0s9 1 ff01::1
enp0s10 1 ff02::1
enp0s10 1 ff01::1


--As of Red Hat 7
[root@oel7node00 ~]# ip maddr
1: lo
 inet 224.0.0.1
 inet6 ff02::1
 inet6 ff01::1
2: enp0s3
 link 01:00:5e:00:00:01
 inet 224.0.0.1
 inet6 ff02::1
 inet6 ff01::1
3: enp0s8
 link 01:00:5e:00:00:01
 inet 224.0.0.1
 inet6 ff02::1
 inet6 ff01::1
4: enp0s9
 link 01:00:5e:00:00:01
 inet 224.0.0.1
 inet6 ff02::1
 inet6 ff01::1
5: enp0s10
 link 01:00:5e:00:00:01
 inet 224.0.0.1
 inet6 ff02::1
 inet6 ff01::1

 

 

LSOF

lsof is no longer included on the OS minimal installation, but not considered as obsolete or deprecated, therefore simply use yun to intall the missing package:

[root@oel7node00 ~]# which lsof
/usr/bin/which: no lsof in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)

[root@oel7node00 ~]# yum install lsof
Loaded plugins: ulninfo
Resolving Dependencies
--> Running transaction check
---> Package lsof.x86_64 0:4.87-4.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================================================================
 Package Arch Version Repository Size
=========================================================================================================================================================
Installing:
 lsof x86_64 4.87-4.el7 ol7_latest 330 k

Transaction Summary
=========================================================================================================================================================
Install 1 Package

Total download size: 330 k
Installed size: 927 k
Is this ok [y/d/N]: y
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
lsof-4.87-4.el7.x86_64.rpm | 330 kB 00:00:00 
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
 Installing : lsof-4.87-4.el7.x86_64 1/1 
 Verifying : lsof-4.87-4.el7.x86_64 1/1

Installed:
 lsof.x86_64 0:4.87-4.el7

Complete!

 

 

 

 

Linux for DBA: How disable the ssh banner for a given user

Ready to install a new Oracle RAC cluster, but the ssh banner (in /etc/issue.net protected by root privileges) is compromising the non-interactive ssh commands issued by grid & oracle?

Here the trick to disable it:

--Add this empty file to the grid and oracle UNIX home
touch ~/.hushlogin 

--or
mkdir -p .ssh
chmod 700 .ssh 
echo "LogLevel quiet" > ~/.ssh/config