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[Jürg Häfliger <1829994@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1829994

Title:
  block_dev from kernel_misc test suite in LTP generates kernel traces

Status in ubuntu-kernel-tests:
  Won't Fix
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Cosmic:
  Invalid

Bug description:
  The test will pass, but there will be some kernel trace messages in
  the syslog:

   ltp_block_dev: Test Case 7: unregister_blkdev() with major=0
   WARNING: CPU: 0 PID: 13195 at block/genhd.c:415 unregister_blkdev+0x64/0xb0
   Modules linked in: ltp_block_dev(OE) msdos minix nls_iso8859_1 xfs binfmt_misc cfg80211 kvm_intel kvm irqbypass input_leds joydev serio_raw mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops floppy drm psmouse virtio_blk virtio_net net_failover i2c_piix4 failover pata_acpi [last unloaded: zram]
   CPU: 0 PID: 13195 Comm: block_dev Tainted: P        W  OE     4.18.0-20-generic #21-Ubuntu
   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
   RIP: 0010:unregister_blkdev+0x64/0xb0
   Code: 00 48 63 c3 48 8b 04 c5 40 83 12 ad 48 85 c0 74 19 44 3b 60 08 75 0b eb 4c 44 39 63 08 74 2a 48 89 d8 48 8b 18 48 85 db 75 ef <0f> 0b 31 db 48 c7 c7 00 90 b7 ac e8 7c 88 55 00 48 89 df e8 f4 13 
   RSP: 0018:ffffbc89c0c8fdc0 EFLAGS: 00010246
   RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
   RDX: ffff9cf134f7d700 RSI: ffffffffc09a4805 RDI: ffffffffacb79000
   RBP: ffffbc89c0c8fdd8 R08: ffff9cf13fc27080 R09: 000000000000142f
   R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000
   R13: ffffffffc09a4805 R14: ffffbc89c0c8fee8 R15: fffffffffffffff2
   FS:  00007fa58aa0d5c0(0000) GS:ffff9cf13fc00000(0000) knlGS:0000000000000000
   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   CR2: 0000556033aef4c8 CR3: 0000000074b1e000 CR4: 00000000000006f0
   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
   Call Trace:
    sys_tcase.cold.0+0x1e8/0x77b [ltp_block_dev]
    dev_attr_store+0x1b/0x30
    sysfs_kf_write+0x3b/0x50
    kernfs_fop_write+0x12e/0x1b0
    __vfs_write+0x1b/0x40
    vfs_write+0xab/0x1b0
    ksys_write+0x55/0xc0
    __x64_sys_write+0x1a/0x20
    do_syscall_64+0x5a/0x110
    entry_SYSCALL_64_after_hwframe+0x44/0xa9
   RIP: 0033:0x7fa58a92bfd4
   Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 48 8d 05 29 f7 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53 
   RSP: 002b:00007fff0cd747c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
   RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fa58a92bfd4
   RDX: 0000000000000001 RSI: 0000556033aee4c0 RDI: 0000000000000015
   RBP: 0000556033aee4c0 R08: 00007fa58aa0d5c0 R09: 0000000000000000
   R10: 0000556032d004f6 R11: 0000000000000246 R12: 0000556033aed280
   R13: 0000000000000001 R14: 00007fa58aa032a0 R15: 00007fa58aa02760
   ---[ end trace 7d89482f2331d988 ]---

   0 test cases failed
   startup='Wed May 22 07:57:20 2019'   
   block_dev    1  TPASS  :  Test-case '1' 
   block_dev    2  TPASS  :  Test-case '2' 
   block_dev    3  TPASS  :  Test-case '3' 
   block_dev    4  TPASS  :  Test-case '4' 
   block_dev    5  TPASS  :  Test-case '5' 
   block_dev    6  TPASS  :  Test-case '6' 
   block_dev    7  TPASS  :  Test-case '7'
   tag=block_dev stime=1558511840 dur=0 exit=exited stat=0 core=no cu=0 cs=0

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-20-generic 4.18.0-20.21
  ProcVersionSignature: User Name 4.18.0-20.21-generic 4.18.20
  Uname: Linux 4.18.0-20-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May 22 06:28 seq
   crw-rw---- 1 root audio 116, 33 May 22 06:28 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu13.3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDmesg:
   
  Date: Wed May 22 07:57:40 2019
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:
   
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-20-generic root=UUID=2a4b0342-a2dd-4feb-b3e2-9644ca1c4a60 ro
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-20-generic N/A
   linux-backports-modules-4.18.0-20-generic  N/A
   linux-firmware                             1.175.4
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-xenial
  dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-xenial
  dmi.sys.vendor: QEMU

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