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[Bug 1486152] Re: Kernel WARN @ block/genhd.c:352 with ltp block dev tests

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Brian Murray <brian@xxxxxxxxxx>
Date: Wed, 19 Aug 2015 15:01:49 -0000
Reply-to: Bug 1486152 <1486152@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1486152

Title:
  Kernel WARN @ block/genhd.c:352 with ltp block dev tests

Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - SACHIN P. SANT <ssant@xxxxxxxxxx> - 2015-08-07 08:28:13 ==
  ---Problem Description---
  Kernel WARN @ block/genhd.c:352 with ltp block dev tests
   
  Contact Information = Sachin Sant / ssant@xxxxxxxxxx 
   
  ---uname output---
  3.19.0-26-generic
   
  Machine Type = POWER8 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   1) Install Ubuntu 14.04.03 running bare-metal
  2) Install LTP and compile the code
  3) run the ltp_block_dev tests 

  The krenel Warning is displayed on the  console during the run
   
  Stack trace output:
   [  175.365323] ltp_block_dev: Test Case Result: PASS
  [  175.365547] ltp_block_dev: Test Case 6: register_blkdev() with name=""
  [  175.365550] ltp_block_dev: Test Case Result: PASS
  [  175.365615] ltp_block_dev: Test Case 7: unregister_blkdev() with major=0
  [  175.365628] ------------[ cut here ]------------
  [  175.365630] WARNING: at /build/linux-lts-vivid-GlOzk5/linux-lts-vivid-3.19.0/block/genhd.c:352
  [  175.365632] Modules linked in: ltp_block_dev(OE) joydev mac_hid hid_generic ofpart ipmi_powernv cmdlinepart ipmi_msghandler powernv_flash mtd opal_prd powernv_rng at24 usbhid hid ast uio_pdrv_genirq syscopyarea uio sysfillrect sysimgblt nouveau ttm drm_kms_helper drm i2c_algo_bit mlx4_en vxlan ip6_udp_tunnel udp_tunnel uas usb_storage bnx2x mlx4_core lpfc ahci libahci scsi_transport_fc mdio libcrc32c [last unloaded: ltp_block_dev]
  [  175.365663] CPU: 133 PID: 4832 Comm: block_dev Tainted: G        W  OE  3.19.0-26-generic #27~14.04.1-Ubuntu
  [  175.365666] task: c000000fcebc9140 ti: c000000fcec1c000 task.ti: c000000fcec1c000
  [  175.365669] NIP: c0000000004eb5cc LR: c0000000004eb574 CTR: c0000000004eb520
  [  175.365671] REGS: c000000fcec1f940 TRAP: 0700   Tainted: G        W  OE   (3.19.0-26-generic)
  [  175.365673] MSR: 9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 28000482  XER: 20000000
  [  175.365681] CFAR: c0000000004eb59c SOFTE: 1 
  [  175.365681] GPR00: c0000000004eb574 c000000fcec1fbc0 c00000000144cc00 0000000000000000 
  [  175.365681] GPR04: d0000000190b12c8 000000000000000d 00000000636f6c62 0000000000000001 
  [  175.365681] GPR08: c00000000174db10 0000000000000000 c00000000174db10 d0000000190b10d0 
  [  175.365681] GPR12: c0000000004eb520 c000000007baad00 0000000000000000 0000000000000000 
  [  175.365681] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
  [  175.365681] GPR20: 0000000000000000 000000001000a8a8 0000000010020010 000000001000a8f0 
  [  175.365681] GPR24: 000000001000a918 000000001000a9b8 00000000000000fb 0000000000000001 
  [  175.365681] GPR28: d0000000190b12c8 c000000001379468 0000000000000000 0000000000000000 
  [  175.365712] NIP [c0000000004eb5cc] unregister_blkdev+0xac/0x160
  [  175.365714] LR [c0000000004eb574] unregister_blkdev+0x54/0x160
  [  175.365716] Call Trace:
  [  175.365719] [c000000fcec1fbc0] [c0000000004eb574] unregister_blkdev+0x54/0x160 (unreliable)
  [  175.365723] [c000000fcec1fc00] [d0000000190b063c] sys_tcase+0x41c/0xb30 [ltp_block_dev]
  [  175.365728] [c000000fcec1fcc0] [c0000000006431f8] dev_attr_store+0x68/0xa0
  [  175.365732] [c000000fcec1fd00] [c00000000035ba30] sysfs_kf_write+0x80/0xb0
  [  175.365735] [c000000fcec1fd40] [c00000000035a97c] kernfs_fop_write+0x18c/0x1f0
  [  175.365739] [c000000fcec1fd90] [c0000000002b488c] vfs_write+0xdc/0x260
  [  175.365743] [c000000fcec1fde0] [c0000000002b573c] SyS_write+0x6c/0x110
  [  175.365747] [c000000fcec1fe30] [c000000000009258] system_call+0x38/0xd0
  [  175.365748] Instruction dump:
  [  175.365750] 419e0030 80e90008 7f87f000 409e0018 480000c0 815f0008 7f8af000 419e0058 
  [  175.365756] 7fe9fb78 ebe90000 2fbf0000 409effe8 <0fe00000> 7fa3eb78 3be00000 48528871 
  [  175.365761] ---[ end trace 02836eb1f955a5cd ]---

   
  Oops output:
   no
   
  System Dump Info:
    The system is not configured to capture a system dump.

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