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[Jürg Häfliger <1868707@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1868707

Title:
  tpci from kernel_misc in ubuntu_ltp failed on B with NULL pointer
  dereference

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Invalid

Bug description:
  Issue found on Bionic 4.15.0-92 but it can be reproduce with Bionic
  4.15.0-91, so it looks like a test case issue to me.

  Test output with 4.15.0-91 during the last SRU cycle:
   startup='Tue Mar 3 20:06:07 2020'
   test_pci 1 TCONF : tst_module.c:70: Failed to find module 'ltp_tpci.ko'
   test_pci 2 TCONF : tst_module.c:70: Remaining cases not appropriate for configuration
   tag=tpci stime=1583265967 dur=0 exit=exited stat=32 core=no cu=0 cs=0

  And it looks like the test case has been updated with:
  https://github.com/linux-test-project/ltp/commit/3dd286bdbee3345de57d9d87fcbed92c5f612515

  And the test output now becomes:
   startup='Wed Mar 18 02:17:52 2020'
   tag=tpci stime=1584497872 dur=0 exit=signaled stat=9 core=no cu=0 cs=2

  If you run this test manually:
  $ sudo ./tpci 
  Killed
  $ uname -a
  Linux larry 4.15.0-91-generic #92-Ubuntu SMP Fri Feb 28 11:09:48 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

  And kernel trace can be found in dmesg:
   BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
   IP: sys_bus_slot+0x62/0x110 [ltp_tpci]
   PGD 0 P4D 0 
   Oops: 0000 [#1] SMP PTI
   Modules linked in: ltp_tpci(OE) kvm_intel kvm irqbypass input_leds joydev serio_raw qemu_fw_cfg mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nfsd auth_rpcgss nfs_acl lockd grace sunrpc 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 psmouse fb_sys_fops virtio_blk floppy drm i2c_piix4 virtio_net pata_acpi
   CPU: 1 PID: 1286 Comm: tpci Tainted: G           OE    4.15.0-91-generic #92-Ubuntu
   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
   RIP: 0010:sys_bus_slot+0x62/0x110 [ltp_tpci]
   RSP: 0018:ffffa05b80ce3e08 EFLAGS: 00010246
   RAX: 0000000000000000 RBX: ffff92487a709a30 RCX: 0000000000000000
   RDX: ffffa05b80ce3dd0 RSI: ffffffffc0732044 RDI: 0000000000000000
   RBP: ffffa05b80ce3e38 R08: 00000000000000ff R09: ffff92487a709a30
   R10: 0000000000000008 R11: f000000000000000 R12: 0000000000000000
   R13: 0000000000000001 R14: 0000000000000000 R15: fffffffffffffff2
   FS:  00007fc90e732580(0000) GS:ffff92487fd00000(0000) knlGS:0000000000000000
   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   CR2: 0000000000000010 CR3: 0000000076b7c000 CR4: 00000000000006e0
   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
   Call Trace:
    dev_attr_store+0x1b/0x30
    sysfs_kf_write+0x3c/0x50
    kernfs_fop_write+0x125/0x1a0
    __vfs_write+0x1b/0x40
    vfs_write+0xb1/0x1a0
    SyS_write+0x5c/0xe0
    do_syscall_64+0x73/0x130
    entry_SYSCALL_64_after_hwframe+0x3d/0xa2
   RIP: 0033:0x7fc90e234154
   RSP: 002b:00007ffe847233f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
   RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc90e234154
   RDX: 0000000000000001 RSI: 00007ffe84723422 RDI: 0000000000000003
   RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
   R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
   R13: 00007ffe8472341c R14: 00007ffe84723422 R15: 00007fc90e732500
   Code: 27 e1 8b 4d d4 48 8b 3d ad 27 00 00 0f b6 c5 48 85 ff 44 0f b6 e1 41 89 c6 74 10 e8 99 56 dd e0 48 c7 05 8e 27 00 00 00 00 00 00 <48> 8b 04 25 10 00 00 00 44 89 e2 44 89 f6 48 8b 80 d0 00 00 00 
   RIP: sys_bus_slot+0x62/0x110 [ltp_tpci] RSP: ffffa05b80ce3e08
   CR2: 0000000000000010
   ---[ end trace b359970625da17ad ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-91-generic 4.15.0-91.92
  ProcVersionSignature: User Name 4.15.0-91.92-generic 4.15.18
  Uname: Linux 4.15.0-91-generic x86_64
  NonfreeKernelModules: ltp_tpci
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 24 11:02 seq
   crw-rw---- 1 root audio 116, 33 Mar 24 11:02 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.12
  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:
  Date: Tue Mar 24 11:04:01 2020
  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:
   
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-91-generic root=UUID=29438a95-0e7a-484b-a1fb-527f0e3d2e06 ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-91-generic N/A
   linux-backports-modules-4.15.0-91-generic  N/A
   linux-firmware                             1.173.16
  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: 1.10.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-bionic
  dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-bionic:cvnQEMU:ct1:cvrpc-i440fx-bionic:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-bionic
  dmi.sys.vendor: QEMU

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