** Also affects: linux (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1813244

Title:
  systemd cause kernel trace "BUG: unable to handle kernel paging
  request at 6db23a14" on Cosmic i386

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  New

Bug description:
  This issue was found after leaving a SUT to run overnight (was testing
  the ubuntu_cts_kernel test 13 hours ago before this happens). Can't
  tell if this is a regression, as I haven't find a way to reproduce it.
  But I do see similar reports on the Internet [1]

  After checking the systemd service timers, it looks like this is
  caused by the logrotate.service:

  $ sudo systemctl list-timers --all
  NEXT                         LEFT          LAST                         
PASSED        UNIT                         ACTIVATES
  Fri 2019-01-25 06:18:58 UTC  1h 40min left Thu 2019-01-24 06:34:15 UTC  22h 
ago       apt-daily-upgrade.timer      apt-daily-upgrade.service
  Fri 2019-01-25 09:15:54 UTC  4h 37min left Fri 2019-01-25 03:43:24 UTC  55min 
ago     apt-daily.timer              apt-daily.service
  Fri 2019-01-25 17:02:47 UTC  12h left      Fri 2019-01-25 04:20:17 UTC  18min 
ago     motd-news.timer              motd-news.service
  Sat 2019-01-26 00:00:00 UTC  19h left      Fri 2019-01-25 00:00:37 UTC  4h 
38min ago  logrotate.timer              logrotate.service
  Sat 2019-01-26 04:02:38 UTC  23h left      Fri 2019-01-25 04:02:38 UTC  36min 
ago     systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.serv
  Mon 2019-01-28 00:00:00 UTC  2 days left   Wed 2019-01-23 10:44:18 UTC  1 day 
17h ago fstrim.timer                 fstrim.service
  n/a                          n/a           n/a                          n/a   
        snapd.snap-repair.timer      snapd.snap-repair.service

  7 timers listed.

  After this happens, you won't be able to reboot it with the command.
  $ sudo reboot
  sudo: unable to resolve host onza: Resource temporarily unavailable
  Killed

  Here is the error message, please refer to the attachment for a
  complete syslog:

  Jan 25 00:00:37 onza systemd[1]: Starting Rotate log files...
  Jan 25 00:00:37 onza kernel: [45282.956634] BUG: unable to handle kernel 
paging request at 6db23a14
  Jan 25 00:00:37 onza kernel: [45282.962902] *pdpt = 0000000033fa1001 *pde = 
0000000000000000 
  Jan 25 00:00:37 onza kernel: [45282.968650] Oops: 0000 [#1] SMP
  Jan 25 00:00:37 onza kernel: [45282.971796] CPU: 0 PID: 407 Comm: 
systemd-journal Not tainted 4.18.0-14-generic #15-Ubuntu
  Jan 25 00:00:37 onza kernel: [45282.980330] Hardware name: Dell Inc. 
PowerEdge R310/05XKKK, BIOS 1.11.0 09/18/2012
  Jan 25 00:00:37 onza kernel: [45282.988127] EIP: __kmalloc+0xc9/0x240
  Jan 25 00:00:37 onza kernel: [45282.991785] Code: 4d e0 8d 4a 01 31 c6 8b 45 
f0 89 75 dc 31 f3 8b 37 64 0f c7 0e 0f 94 c0 84 c0 74 b9 8b 75 e4 8b 45 dc 39 
45 e0 74 0e 03 5f 14 <33> 1b 33 9f b4 00 00 00 0f 18 03 f7 45 ec 00 80 00 00 0f 
85 3f 01 
  Jan 25 00:00:37 onza kernel: [45283.011254] EAX: 9e20b374 EBX: 6db23a14 ECX: 
0000350d EDX: 0000350c
  Jan 25 00:00:37 onza kernel: [45283.017769] ESI: eac03a00 EDI: eac03a00 EBP: 
f461fd9c ESP: f461fd74
  Jan 25 00:00:37 onza kernel: [45283.024304] DS: 007b ES: 007b FS: 00d8 GS: 
00e0 SS: 0068 EFLAGS: 00010206
  Jan 25 00:00:37 onza kernel: [45283.031245] CR0: 80050033 CR2: 6db23a14 CR3: 
29d304a0 CR4: 000006f0
  Jan 25 00:00:37 onza kernel: [45283.037770] Call Trace:
  Jan 25 00:00:37 onza kernel: [45283.040395]  ? 
ext4_htree_store_dirent+0x2e/0x120
  Jan 25 00:00:37 onza kernel: [45283.045255]  
ext4_htree_store_dirent+0x2e/0x120
  Jan 25 00:00:37 onza kernel: [45283.049951]  htree_dirblock_to_tree+0xd2/0x230
  Jan 25 00:00:37 onza kernel: [45283.054562]  ext4_htree_fill_tree+0x7f/0x2c0
  Jan 25 00:00:37 onza kernel: [45283.058991]  ? 
kmem_cache_alloc_trace+0x167/0x1e0
  Jan 25 00:00:37 onza kernel: [45283.063849]  ? ext4_readdir+0x9d4/0xb10
  Jan 25 00:00:37 onza kernel: [45283.067854]  ext4_readdir+0x6aa/0xb10
  Jan 25 00:00:37 onza kernel: [45283.071687]  ? _copy_to_user+0x21/0x30
  Jan 25 00:00:37 onza kernel: [45283.075597]  ? do_statfs64+0x34/0x60
  Jan 25 00:00:37 onza kernel: [45283.079334]  ? 
security_file_permission+0x7c/0xb0
  Jan 25 00:00:37 onza kernel: [45283.084306]  iterate_dir+0x15c/0x1a0
  Jan 25 00:00:37 onza kernel: [45283.087883]  ksys_getdents64+0x6f/0x110
  Jan 25 00:00:37 onza kernel: [45283.091853]  ? iterate_dir+0x1a0/0x1a0
  Jan 25 00:00:37 onza kernel: [45283.095771]  sys_getdents64+0x16/0x20
  Jan 25 00:00:37 onza kernel: [45283.099595]  do_fast_syscall_32+0x7f/0x1e0
  Jan 25 00:00:37 onza kernel: [45283.103858]  entry_SYSENTER_32+0x4e/0x7c
  Jan 25 00:00:37 onza kernel: [45283.107938] EIP: 0xb7ef4d41
  Jan 25 00:00:37 onza kernel: [45283.110898] Code: f6 ff ff 55 89 e5 8b 55 08 
8b 80 5c cd ff ff 85 d2 74 02 89 02 5d c3 8b 04 24 c3 8b 1c 24 c3 90 90 51 52 
55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 
90 8d 76 
  Jan 25 00:00:37 onza kernel: [45283.130298] EAX: ffffffda EBX: 00000021 ECX: 
02219dec EDX: 00008000
  Jan 25 00:00:37 onza kernel: [45283.136824] ESI: ffffffb4 EDI: 00000000 EBP: 
02219dd0 ESP: bff8f5e8
  Jan 25 00:00:37 onza kernel: [45283.143245] DS: 007b ES: 007b FS: 0000 GS: 
0033 SS: 007b EFLAGS: 00000296
  Jan 25 00:00:37 onza kernel: [45283.150299] Modules linked in: iptable_nat 
ip_gre gre ip_tunnel dummy iptable_filter xt_recent bpfilter openvswitch nsh 
nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 
nf_defrag_ipv6 nf_conncount nf_nat nf_conntrack intel_powerclamp coretemp 
ipmi_ssif kvm_intel kvm dcdbas ipmi_si joydev irqbypass intel_cstate input_leds 
ipmi_devintf i7core_edac ipmi_msghandler acpi_power_meter 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 mgag200 i2c_algo_bit ttm hid_generic 
drm_kms_helper gpio_ich syscopyarea sysfillrect sysimgblt mpt3sas fb_sys_fops 
drm
  Jan 25 00:00:37 onza kernel: [45283.222723]  usbhid raid_class pata_acpi 
lpc_ich hid scsi_transport_sas bnx2 wmi
  Jan 25 00:00:37 onza kernel: [45283.230378] CR2: 000000006db23a14
  Jan 25 00:00:37 onza kernel: [45283.233894] ---[ end trace a12425d45f6ac772 
]---

  [1] 
https://forum.manjaro.org/t/systemd-timer-crashing-my-system-at-midnight/19609
  [2]

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-14-generic 4.18.0-14.15
  ProcVersionSignature: User Name 4.18.0-14.15-generic 4.18.20
  Uname: Linux 4.18.0-14-generic i686
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jan 25 03:48 seq
   crw-rw---- 1 root audio 116, 33 Jan 25 03:48 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: i386
  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: Fri Jan 25 04:18:08 2019
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  MachineType: Dell Inc. PowerEdge R310
  PciMultimedia:
   
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-14-generic 
root=UUID=6aaa11f6-d386-4c0c-b4b8-38e6c408980a ro console=ttyS0,115200n8
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-14-generic N/A
   linux-backports-modules-4.18.0-14-generic  N/A
   linux-firmware                             1.175.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/18/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.11.0
  dmi.board.name: 05XKKK
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.11.0:bd09/18/2012:svnDellInc.:pnPowerEdgeR310:pvr:rvnDellInc.:rn05XKKK:rvrA05:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R310
  dmi.sys.vendor: Dell Inc.
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jan 25 03:48 seq
   crw-rw---- 1 root audio 116, 33 Jan 25 03:48 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: i386
  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:
   [ 1844.906725] cfg80211: Loading compiled-in X.509 certificates for 
regulatory database
   [ 1844.913322] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
  DistroRelease: Ubuntu 18.10
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  MachineType: Dell Inc. PowerEdge R310
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-14-generic 
root=UUID=6aaa11f6-d386-4c0c-b4b8-38e6c408980a ro console=ttyS0,115200n8
  ProcVersionSignature: User Name 4.18.0-14.15-generic 4.18.20
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-14-generic N/A
   linux-backports-modules-4.18.0-14-generic  N/A
   linux-firmware                             1.175.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  cosmic uec-images
  Uname: Linux 4.18.0-14-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video
  _MarkForUpload: True
  dmi.bios.date: 09/18/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.11.0
  dmi.board.name: 05XKKK
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.11.0:bd09/18/2012:svnDellInc.:pnPowerEdgeR310:pvr:rvnDellInc.:rn05XKKK:rvrA05:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R310
  dmi.sys.vendor: Dell Inc.

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