Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc4

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1753950

Title:
  Ubuntu18.04[P9, WSP]:  While running ltp  kernel_misc test hitting cpu
  warn_on on  unregister_blkdev+0xac/0x300

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Praveen K. Pandey <praveen.pan...@in.ibm.com> - 2018-03-06 
05:19:10 ==
  Problem Description :

  While running ltp  kernel_misc  test hitting  cpu warn_on on
  unregister_blkdev

  Reproducible Step:

  1- Install WSP system with Ubuntu18.04
  2- get ltp from github 

  a- git clone https://github.com/linux-test-project/ltp.git
  b-cd ltp 
  c- make autotools
  d- ./configure
  e- make
  f- make install
  g- cd /opt/ltp
  h- ./runltp -f kernel_misc

  LOG:


  [87195.381004] WARNING: CPU: 8 PID: 25873 at 
/build/linux-jWa1Fv/linux-4.15.0/block/genhd.c:400 unregister_blkdev+0xac/0x300
  [87195.381166] Modules linked in: ltp_block_dev(OE) sctp nls_iso8859_1 ntfs 
btrfs zstd_compress xor raid6_pq xfs libcrc32c idt_89hpesx ofpart at24 
uio_pdrv_genirq cmdlinepart powernv_flash ibmpowernv vmx_crypto mtd 
ipmi_powernv ipmi_devintf ipmi_msghandler crct10dif_vpmsum opal_prd uio 
sch_fq_codel ip_tables x_tables autofs4 ast i2c_algo_bit ttm drm_kms_helper 
syscopyarea sysfillrect sysimgblt fb_sys_fops ahci crc32c_vpmsum drm tg3 
libahci [last unloaded: ltp_fw_load]
  [87195.381750] CPU: 8 PID: 25873 Comm: block_dev Tainted: G           OE    
4.15.0-10-generic #11-Ubuntu
  [87195.381869] NIP:  c00000000069808c LR: c00000000069803c CTR: 
c000000000697fe0
  [87195.381967] REGS: c000001cf0bf3970 TRAP: 0700   Tainted: G           OE    
 (4.15.0-10-generic)
  [87195.382078] MSR:  9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 28000822 
 XER: 20040000
  [87195.382177] CFAR: c00000000069805c SOFTE: 1 
  [87195.382177] GPR00: c00000000069803c c000001cf0bf3bf0 c0000000016ea600 
0000000000000000 
  [87195.382177] GPR04: c008000019e113d8 000000000000000d 00000000636f6c62 
c000001cee876a00 
  [87195.382177] GPR08: c000000001a0f4b8 0000000000000000 0000000000000000 
c008000019e111b8 
  [87195.382177] GPR12: c000000000697fe0 c00000000fa85800 0000000000000000 
0000000000000000 
  [87195.382177] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000 
  [87195.382177] GPR20: 000007399d9b8c10 000007399d9b8c28 00007fffd61064a4 
000007399d9b8c50 
  [87195.382177] GPR24: 000007399d9b8cf0 000007399d9d0010 c000001cf0bf3e00 
00000000000000fc 
  [87195.382177] GPR28: c008000019e113d8 c0000000015e2a60 0000000000000000 
0000000000000000 
  [87195.383098] NIP [c00000000069808c] unregister_blkdev+0xac/0x300
  [87195.383180] LR [c00000000069803c] unregister_blkdev+0x5c/0x300
  [87195.383266] Call Trace:
  [87195.383302] [c000001cf0bf3bf0] [c00000000069803c] 
unregister_blkdev+0x5c/0x300 (unreliable)
  [87195.383424] [c000001cf0bf3c30] [c008000019e10790] sys_tcase+0x558/0xbe0 
[ltp_block_dev]
  [87195.383542] [c000001cf0bf3ce0] [c0000000008530dc] dev_attr_store+0x3c/0x60
  [87195.383628] [c000001cf0bf3d00] [c00000000049a6b4] sysfs_kf_write+0x64/0x90
  [87195.383726] [c000001cf0bf3d20] [c0000000004993ac] 
kernfs_fop_write+0x1ac/0x270
  [87195.383824] [c000001cf0bf3d70] [c0000000003cf8dc] __vfs_write+0x3c/0x70
  [87195.383919] [c000001cf0bf3d90] [c0000000003cfb38] vfs_write+0xd8/0x220
  [87195.384009] [c000001cf0bf3de0] [c0000000003cfe58] SyS_write+0x68/0x110
  [87195.384103] [c000001cf0bf3e30] [c00000000000b184] system_call+0x58/0x6c
  [87195.384196] Instruction dump:
  [87195.384241] 419e0030 812a0008 7f89f000 409e0018 48000144 813f0008 7f89f040 
419e0058 
  [87195.384347] 7feafb78 ebea0000 2fbf0000 409effe8 <0fe00000> 7fa3eb78 
3be00000 48668431 
  [87195.384459] ---[ end trace fdc18fb4b5cc1498 ]---

  
  Regards
  Praveen

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