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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I removed the Zesty bug task since it is now EOL.  Does this bug still
happen with the latest HWE kernel for Xenial?


** No longer affects: linux (Ubuntu Zesty)

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https://bugs.launchpad.net/bugs/1724120

Title:
  Ubuntu 16.04.3 - call traces occurs when memory-hotplug test is run
  with 16Gb hugepages configured

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Artful:
  In Progress

Bug description:
  Issue:

  Call traces occurs when memory-hotplug script is run with 16Gb
  hugepages configured.

  Environment:
  ppc64le PowerVM Lpar

  root@ltctuleta-lp1:~# uname -r
  4.4.0-34-generic

  root@ltctuleta-lp1:~# cat /proc/meminfo | grep -i huge
  AnonHugePages:         0 kB
  HugePages_Total:       2
  HugePages_Free:        2
  HugePages_Rsvd:        0
  HugePages_Surp:        0
  Hugepagesize:   16777216 kB

  root@ltctuleta-lp1:~# free -h
                total        used        free      shared  buff/cache   available
  Mem:            85G         32G         52G         16M        193M         52G
  Swap:           43G          0B         43G

  Steps to reproduce:
  1 - Download kernel source and enter to the directory- tools/testing/selftests/memory-hotplug/
  2 - Run  mem-on-off-test.sh script in it.

  System gives call traces like:

  offline_memory_expect_success 639: unexpected fail
  online-offline 668
  [   57.552964] Unable to handle kernel paging request for data at address 0x00000028
  [   57.552977] Faulting instruction address: 0xc00000000029bc04
  [   57.552987] Oops: Kernel access of bad area, sig: 11 [#1]
  [   57.552992] SMP NR_CPUS=2048 NUMA pSeries
  [   57.553002] Modules linked in: btrfs xor raid6_pq pseries_rng sunrpc autofs4 ses enclosure nouveau bnx2x i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm vxlan ip6_udp_tunnel ipr udp_tunnel rtc_generic mdio libcrc32c
  [   57.553050] CPU: 44 PID: 6518 Comm: mem-on-off-test Not tainted 4.4.0-34-generic #53-Ubuntu
  [   57.553059] task: c00000072773c8e0 ti: c000000727780000 task.ti: c000000727780000
  [   57.553067] NIP: c00000000029bc04 LR: c00000000029bbdc CTR: c0000000001107f0
  [   57.553076] REGS: c000000727783770 TRAP: 0300   Not tainted  (4.4.0-34-generic)
  [   57.553083] MSR: 8000000100009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24242882  XER: 00000002
  [   57.553104] CFAR: c000000000008468 DAR: 0000000000000028 DSISR: 40000000 SOFTE: 1 
  GPR00: c00000000029bbdc c0000007277839f0 c0000000015b5d00 0000000000000000 
  GPR04: 000000000029d000 0000000000000800 0000000000000000 f00000000a000001 
  GPR08: f00000000a700020 0000000000000008 c00000000185e270 c000000e7e000050 
  GPR12: 0000000000002200 c00000000e6ea200 000000000029d000 0000000022000000 
  GPR16: 1000000000000000 c0000000015e2200 000000000a700000 0000000000000000 
  GPR20: 0000000000010000 0000000000000100 0000000000000200 c0000000015f16d0 
  GPR24: c000000001876510 0000000000000000 0000000000000001 c000000001872a00 
  GPR28: 000000000029d000 f000000000000000 f00000000a700000 000000000029c000 
  [   57.553211] NIP [c00000000029bc04] dissolve_free_huge_pages+0x154/0x220
  [   57.553219] LR [c00000000029bbdc] dissolve_free_huge_pages+0x12c/0x220
  [   57.553226] Call Trace:
  [   57.553231] [c0000007277839f0] [c00000000029bbdc] dissolve_free_huge_pages+0x12c/0x220 (unreliable)
  [   57.553244] [c000000727783a80] [c0000000002dcbc8] __offline_pages.constprop.6+0x3f8/0x900
  [   57.553254] [c000000727783bd0] [c0000000006fbb38] memory_subsys_offline+0xa8/0x110
  [   57.553265] [c000000727783c00] [c0000000006d6424] device_offline+0x104/0x140
  [   57.553274] [c000000727783c40] [c0000000006fba80] store_mem_state+0x180/0x190
  [   57.553283] [c000000727783c80] [c0000000006d1e58] dev_attr_store+0x68/0xa0
  [   57.553293] [c000000727783cc0] [c000000000398110] sysfs_kf_write+0x80/0xb0
  [   57.553302] [c000000727783d00] [c000000000397028] kernfs_fop_write+0x188/0x200
  [   57.553312] [c000000727783d50] [c0000000002e190c] __vfs_write+0x6c/0xe0
  [   57.553321] [c000000727783d90] [c0000000002e2640] vfs_write+0xc0/0x230
  [   57.553329] [c000000727783de0] [c0000000002e367c] SyS_write+0x6c/0x110
  [   57.553339] [c000000727783e30] [c000000000009204] system_call+0x38/0xb4
  [   57.553346] Instruction dump:
  [   57.553351] 7e831836 4bfff991 e91e0028 e8fe0020 7d32e82a f9070008 f8e80000 fabe0020 
  [   57.553366] fade0028 79294620 79291764 7d234a14 <e9030028> 3908ffff f9030028 81091458 
  [   57.553383] ---[ end trace 617f7bdd75bcfc10 ]---
  [   57.557133] 
  Segmentation fault

  The following commit IDs were built into a 4.10.0-37-generic #41 test
  kernel and verified to fix the problem:

  a525108cf1cc14651602d678da38fa627a76a724
  e1073d1e7920946ac4776a619cc40668b9e1401b
  40692eb5eea209c2dd55857f44b4e1d7206e91d6
  e24a1307ba1f99fc62a0bd61d5e87fcfb6d5503d
  79cc38ded1e1ac86e69c90f604efadd50b0b3762
  4ae279c2c96ab38a78b954d218790a8f6db714e5

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