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[Bug 1495863] sysctl -a output from amp


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** Attachment added: "sysctl -a output from amp"

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  ISST-KVM: R3-0: Firestone: PowerNV : Call traces w.r.t filesystem
  while running stress test

Status in linux package in Ubuntu:

Bug description:
  == Comment: #0 - Krishnaja Balachandran <kribalac@xxxxxxxxxx> - 2015-09-02 05:01:44 ==
  ---Problem Description---
  While running stress tests( IO BASE TCP NFS) on Firestone system "amp" I see the following call traces in "dmesg". Also, few commands are hanging in amp.

  Contact Information = kribalac@xxxxxxxxxx 
  ---uname output---
  Linux amp 3.19.0-26-generic #28~14.04.1-Ubuntu SMP Wed Aug 12 14:10:52 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux

  Machine Type = PowerNV 8335-GTA

  "xmon" was configured, however the system did not enter into the debugger
  Stack trace output:
   [69633.095738] INFO: rcu_sched detected stalls on CPUs/tasks: { 11 59} (detected by 171, t=10356287 jiffies, g=2131264, c=2131263, q=51507717)
  [69633.096031] Task dump for CPU 11:
  [69633.096058] kswapd8         R  running task        0   989      2 0x00000804
  [69633.096110] Call Trace:
  [69633.096138] [c000003c9f93f070] [c000003c9f93f0b0] 0xc000003c9f93f0b0 (unreliable)
  [69633.096347] [c000003c9f93f240] [c000003c9f93f370] 0xc000003c9f93f370
  [69633.096399] Task dump for CPU 59:
  [69633.096426] kworker/u386:14 D 0000000000000000     0 77488      2 0x00000804
  [69633.096484] Workqueue: writeback bdi_writeback_workfn (flush-8:32)
  [69633.096536] Call Trace:
  [69633.096556] [c000003c9f936f00] [c000001ff4ee76f0] 0xc000001ff4ee76f0 (unreliable)
  [69633.096618] [c000003c9f9370d0] [c000003c9f937130] 0xc000003c9f937130
  [69633.096671] [c000003c9f937130] [c000000000a11370] __schedule+0x370/0x8d0
  [69633.096726] [c000003c9f937350] [c000000000a153e8] rwsem_down_write_failed+0x288/0x400
  [69633.096788] [c000003c9f9373e0] [c000000000a147f8] down_write+0x88/0x90
  [69633.096864] [c000003c9f937410] [d000000029bc5254] xfs_ilock+0xf4/0x160 [xfs]
  [69633.096933] [c000003c9f937450] [d000000029bc1bc8] xfs_iomap_write_allocate+0x238/0x3f0 [xfs]
  [69633.097011] [c000003c9f937580] [d000000029ba60bc] xfs_map_blocks+0x1cc/0x2f0 [xfs]
  [69633.097087] [c000003c9f9375f0] [d000000029ba7b24] xfs_vm_writepage+0x194/0x630 [xfs]
  [69633.097148] [c000003c9f9376d0] [c00000000021c66c] __writepage+0x4c/0xb0
  [69633.097373] [c000003c9f937710] [c00000000021cda4] write_cache_pages+0x1e4/0x4c0
  [69633.097437] [c000003c9f937850] [c00000000021d0e4] generic_writepages+0x64/0x90
  [69633.097513] [c000003c9f9378b0] [d000000029ba5e70] xfs_vm_writepages+0x70/0xa0 [xfs]
  [69633.097575] [c000003c9f9378f0] [c00000000021e720] do_writepages+0x60/0xc0
  [69633.097627] [c000003c9f937920] [c0000000002f1db8] __writeback_single_inode+0x68/0x370
  [69633.097687] [c000003c9f937970] [c0000000002f2478] writeback_sb_inodes+0x2c8/0x4f0
  [69633.097747] [c000003c9f937a40] [c0000000002f2784] __writeback_inodes_wb+0xe4/0x150
  [69633.097807] [c000003c9f937aa0] [c0000000002f354c] wb_writeback+0x30c/0x3e0
  [69633.097859] [c000003c9f937b40] [c0000000002f405c] bdi_writeback_workfn+0x14c/0x550
  [69633.097919] [c000003c9f937c60] [c0000000000d28bc] process_one_work+0x19c/0x480
  [69633.097980] [c000003c9f937cf0] [c0000000000d3160] worker_thread+0x190/0x5b0
  [69633.098032] [c000003c9f937d80] [c0000000000da494] kthread+0x114/0x140
  [69633.098085] [c000003c9f937e30] [c00000000000956c] ret_from_kernel_thread+0x5c/0x70


  System is on a private network.  Access the private network via SSH to "banner.isst.aus.stglabs.ibm.com" using your GSA ID and password. 
  (Banner itself is behind a BSO, so must authenticate through that first.)

  Login details :  
  ssh banner.isst.aus.stglabs.ibm.com [debug/don2rry ]

  Host login:-

  amp.isst.aus.stglabs.ibm.com [ ]

  login via GUI:
  bmc-amp.isst.aus.stglabs.ibm.com [ ]

  IPMI Login to host amp console :- 
  From banner machine run the following :
  ssh banner.isst.aus.stglabs.ibm.com [debug/don2rry ]

  ipmitool -I lanplus -H bmc-amp -U ADMIN -P admin sol deactivate
  ipmitool -I lanplus -H bmc-amp -U ADMIN -P admin sol activate

                               TESTING INFORMATION


     HOST NAME or NETWORK ADDRESS:   amp.isst.aus.stglabs.ibm.com [ ]
     BMC NAME and BMC ip: 	bmc-amp.isst.aus.stglabs.ibm.com [ ]

     Firmware Revision: 		2.02.82263
     Firmware Build Time: 	Aug 24 2015 10:44:30 CDT


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