Public bug reported:
== Comment: #0 - SACHIN P. SANT <[email protected]> - 2015-08-07 08:28:13 ==
---Problem Description---
Kernel WARN @ block/genhd.c:352 with ltp block dev tests
Contact Information = Sachin Sant / [email protected]
---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.
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: architecture-ppc64le bugnameltc-128659 severity-medium
targetmilestone-inin14043
** Tags added: architecture-ppc64le bugnameltc-128659 severity-medium
targetmilestone-inin14043
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https://bugs.launchpad.net/bugs/1486152
Title:
Kernel WARN @ block/genhd.c:352 with ltp block dev tests
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