[Bug 818177] Re: boot failures because 'udevadm exit' does not kill udevd worker threads

[Serge Hallyn]

With initrd's scripts/init-top/udev changed to run udev with -D and >
/run/initrd/udev.log 2>&1, I get this output.  I also added to
udev/udevd.c the following patch.  Note that IIUC there are both workers
and events on the list.  Every time that I've tried to print out info
about the remaining events, I've failed to reproduce the hang.

(This, fwiw, is on the VMs with no LVM at all)

Index: udev-173/udev/udevd.c
===================================================================
--- udev-173.orig/udev/udevd.c  2011-10-06 22:14:07.000000000 -0500
+++ udev-173/udev/udevd.c       2011-10-06 22:34:12.000000000 -0500
@@ -1633,8 +1633,16 @@
                        worker_kill(udev, 0);
 
                        /* exit after all has cleaned up */
-                       if (udev_list_is_empty(&event_list) && udev_list_is_empty(&worker_list))
+                       if (udev_list_is_empty(&event_list) && udev_list_is_empty(&worker_list)) {
+                               info(udev, "event list and worker list are empty\n");
                                break;
+                       }
+                       if (!udev_list_is_empty(&event_list)) {
+                               info(udev, "with udev_exit, event list not empty\n");
+                       }
+                       if (!udev_list_is_empty(&worker_list)) {
+                               info(udev, "with udev_exit, worker list not empty\n");
+                       }
 
                        /* timeout at exit for workers to finish */
                        timeout = 60 * 1000;


** Attachment added: "udev3.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/818177/+attachment/2520821/+files/udev3.log

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https://bugs.launchpad.net/bugs/818177

Title:
  boot failures because 'udevadm exit' does not kill udevd worker
  threads

Status in Release Notes for Ubuntu:
  Triaged
Status in “linux” package in Ubuntu:
  Invalid
Status in “udev” package in Ubuntu:
  Triaged
Status in “linux” source package in Oneiric:
  Invalid
Status in “udev” source package in Oneiric:
  Triaged
Status in “linux” source package in p-series:
  Invalid
Status in “udev” source package in p-series:
  Triaged

Bug description:
  After running a do-release-upgrade -d on a natty server, I'm unable to
  boot the machine properly.

  It looks like it doesn't see the local disks anymore.

  I think this looks quite a lot like the debbug linked from here:
  https://bugs.launchpad.net/ubuntu/oneiric/+source/linux/+bug/746751

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-7-server 3.0.0-7.8
  ProcVersionSignature: Ubuntu 3.0.0-7.8-server 3.0.0
  Uname: Linux 3.0.0-7-server x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 2011-07-29 13:34 seq
   crw-rw---- 1 root audio 116, 33 2011-07-29 13:34 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Date: Fri Jul 29 13:40:10 2011
  HibernationDevice: RESUME=UUID=844d17fa-ff69-4250-844b-33b930236c56
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
  MachineType: HP ProLiant DL380 G5
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:
   PATH=(custom, user)
   LANG=en_US
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-7-server root=/dev/mapper/User Name-root ro INIT_VERBOSE=yes
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-7-server N/A
   linux-backports-modules-3.0.0-7-server  N/A
   linux-firmware                          1.56
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux
  UpgradeStatus: Upgraded to oneiric on 2011-07-29 (0 days ago)
  dmi.bios.date: 06/28/2007
  dmi.bios.vendor: HP
  dmi.bios.version: P56
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrP56:bd06/28/2007:svnHP:pnProLiantDL380G5:pvr:cvnHP:ct23:cvr:
  dmi.product.name: ProLiant DL380 G5
  dmi.sys.vendor: HP

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