apport information

** Tags added: apport-collected uec-images

** Description changed:

  I ran into a problem with the console argument handling on a physical
  system with a BMC (Dell R610) and also reproduced the same behavior on a
  QEMU/KVM VM with multiple serial ports.
  
  The kernel documentation notes that the last entry will be used for 
/dev/console
  https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-tty
  "What:        /sys/class/tty/console/active
           Shows the list of currently configured console devices, like 'tty1 
ttyS0'. The last entry in the file is the active device connected to 
/dev/console.
           The file supports poll() to detect virtual console switches."
  
  https://elixir.bootlin.com/linux/v4.15.18/source/kernel/printk/printk.c#L1960
  "The last preferred console added will be used for kernel messages and 
stdin/out/err for init."
  
  The actual behavior is different and the console specified in the last
  console argument does not become an active one. As a result, SOL
  functionality is not possible to use unless only one ttyS<n> argument is
  specified in the kernel command line arguments. Setting the arguments to
  only contain the right one results in a proper behavior and I can see rx
  counters increasing in /proc/tty/driver/serial for the relevant port
  after I type something via the BMC.
  
  $ cat /proc/cmdline
  BOOT_IMAGE=/vmlinuz-4.15.0-42-generic 
root=UUID=580a3c58-1040-4c7d-b94f-93230874caf5 ro console=tty0 
console=ttyS0,115200 console=ttyS1,115200
  
  journalctl -k | grep ttyS
  Dec 03 21:42:41 ubuntu kernel: Command line: 
BOOT_IMAGE=/vmlinuz-4.15.0-42-generic 
root=UUID=580a3c58-1040-4c7d-b94f-93230874caf5 ro console=tty0 
console=ttyS0,115200 console=ttyS1,115200
  Dec 03 21:42:41 ubuntu kernel: Kernel command line: 
BOOT_IMAGE=/vmlinuz-4.15.0-42-generic 
root=UUID=580a3c58-1040-4c7d-b94f-93230874caf5 ro console=tty0 
console=ttyS0,115200 console=ttyS1,115200
  Dec 03 21:42:41 ubuntu kernel: console [ttyS0] enabled
  Dec 03 21:42:41 ubuntu kernel: 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud 
= 115200) is a 16550A
  Dec 03 21:42:41 ubuntu kernel: 00:03: ttyS1 at I/O 0x2f8 (irq = 3, base_baud 
= 115200) is a 16550A
  Dec 03 21:42:41 ubuntu kernel: tty ttyS3: hash matches
  
  Full dmesg: http://paste.ubuntu.com/p/bV2pDc4Hdw/
  
  $ cat /sys/class/tty/console/active
  ttyS0 tty0
  
  $ sudo cat /proc/tty/driver/serial
  serinfo:1.0 driver revision:
  0: uart:16550A port:000003F8 irq:4 tx:78 rx:0 RTS|DTR
  1: uart:16550A port:000002F8 irq:3 tx:0 rx:0 CTS|DSR|CD
  2: uart:unknown port:000003E8 irq:4
  3: uart:unknown port:000002E8 irq:3
  # ...
  
  ~~~
  GRUB setttings:
  
  # the ones that override /etc/default/grub
  $ cat /etc/default/grub.d/50-curtin-settings.cfg
  cat: cat: No such file or directory
  GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200 
console=ttyS1,115200"
  # disable grub os prober that might find other OS installs.
  GRUB_DISABLE_OS_PROBER=true
  GRUB_TERMINAL=console
  
  /etc/default/grub: https://paste.ubuntu.com/p/sdWQrY7JwN/
  
  # grub.cfg: http://paste.ubuntu.com/p/zKGTqDh6sR/
  # two entries, both with the proper arg and properly sent to the kernel 
cmdline based on /proc/cmdline
  grep ttyS grub.cfg
          linux /vmlinuz-4.15.0-42-generic 
root=UUID=580a3c58-1040-4c7d-b94f-93230874caf5 ro  console=tty0 
console=ttyS0,115200 console=ttyS1,115200
           linux        /vmlinuz-4.15.0-42-generic 
root=UUID=580a3c58-1040-4c7d-b94f-93230874caf5 ro  console=tty0 
console=ttyS0,115200 console=ttyS1,115200
  
  ~~~
  
  I managed to reproduce the exact same behavior on a VM with multiple
  8250 serial ports.
  
  ubuntu@maas-vhost5:~$ cat /sys/class/tty/console/active
  ttyS0
  
  ubuntu@maas-vhost5:~$ cat /proc/cmdline
  BOOT_IMAGE=/boot/vmlinuz-4.15.0-42-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro console=ttyS0,115200 
console=ttyS2,115200 console=ttyS1,115200
  
  ubuntu@maas-vhost5:~$ grep -RP ttyS /boot/grub/grub.cfg
          linux /boot/vmlinuz-4.15.0-42-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro  console=ttyS0,115200 
console=ttyS2,115200 console=ttyS1,115200
           linux        /boot/vmlinuz-4.15.0-42-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro  console=ttyS0,115200 
console=ttyS2,115200 console=ttyS1,115200
           linux        /boot/vmlinuz-4.15.0-39-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro  console=ttyS0,115200 
console=ttyS2,115200 console=ttyS1,115200
  
  # changed to the following config with only ttyS1 present:
  ubuntu@maas-vhost5:~$ grep -RP ttyS /boot/grub/grub.cfg
          linux /boot/vmlinuz-4.15.0-42-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro  console=ttyS1,115200
           linux        /boot/vmlinuz-4.15.0-42-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro  console=ttyS1,115200
           linux        /boot/vmlinuz-4.15.0-39-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro  console=ttyS1,115200
  
  # 1 tty passed only
  ubuntu@maas-vhost5:~$ cat /proc/cmdline
  BOOT_IMAGE=/boot/vmlinuz-4.15.0-42-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro console=ttyS1,115200
  
  # now it's shown as active
  ubuntu@maas-vhost5:~$ cat /sys/class/tty/console/active
  ttyS1
  
  ubuntu@maas-vhost5:~$ sudo cat /proc/tty/driver/serial
  serinfo:1.0 driver revision:
  0: uart:16550A port:000003F8 irq:4 tx:0 rx:0 CTS|DSR|CD
  1: uart:16550A port:000002F8 irq:3 tx:14763 rx:0 RTS|CTS|DTR|DSR|CD
  2: uart:16550A port:000003E8 irq:4 tx:0 rx:0 CTS|DSR|CD
  
  ~~~~
  
  Relevant code:
  https://elixir.bootlin.com/linux/v4.15.18/source/kernel/printk/printk.c#L2379
  https://elixir.bootlin.com/linux/v4.15.18/source/kernel/printk/printk.c#L1916
  https://elixir.bootlin.com/linux/v4.15.18/source/kernel/printk/printk.c#L1961
  https://elixir.bootlin.com/linux/v4.15.18/source/kernel/printk/printk.c#L1886
+ --- 
+ ProblemType: Bug
+ AlsaDevices:
+  total 0
+  crw-rw---- 1 root audio 116,  1 Dec  6 14:38 seq
+  crw-rw---- 1 root audio 116, 33 Dec  6 14:38 timer
+ AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
+ ApportVersion: 2.20.9-0ubuntu7.5
+ 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:
+ DistroRelease: Ubuntu 18.04
+ IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
+ Lsusb:
+  Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
+ Package: linux (not installed)
+ PciMultimedia:
+  
+ ProcFB: 0 qxldrmfb
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-42-generic 
root=UUID=a60217c2-6752-4c69-afb9-55f86a2b6c1d ro console=ttyS0,115200 
console=ttyS1,115200
+ ProcVersionSignature: User Name 4.15.0-42.45-generic 4.15.18
+ RelatedPackageVersions:
+  linux-restricted-modules-4.15.0-42-generic N/A
+  linux-backports-modules-4.15.0-42-generic  N/A
+  linux-firmware                             1.173.2
+ RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
+ Tags:  bionic uec-images
+ Uname: Linux 4.15.0-42-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm audio cdrom dialout dip floppy lxd netdev plugdev sudo video
+ _MarkForUpload: True
+ 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-q35-2.11
+ dmi.modalias: 
dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-2.11:cvnQEMU:ct1:cvrpc-q35-2.11:
+ dmi.product.name: Standard PC (Q35 + ICH9, 2009)
+ dmi.product.version: pc-q35-2.11
+ dmi.sys.vendor: QEMU

** Attachment added: "CRDA.txt"
   https://bugs.launchpad.net/bugs/1807140/+attachment/5219754/+files/CRDA.txt

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https://bugs.launchpad.net/bugs/1807140

Title:
  The last console= argument is not used by the kernel

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