[Bug 1099349] Re: mountall 2.36.3 hangs in recovery-menu (lvm; mountall 2.36 has no issue)

[Margarita Manterola]

I was also able to reproduce this in a fresh precise machine, installing
it under kvm.

Similar lsblk:
NAME                     MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
vda                      253:0    0  15.6G  0 disk 
├─vda1                   253:1    0   237M  0 part /boot
├─vda2                   253:2    0     1K  0 part 
└─vda5                   253:5    0  15.4G  0 part 
  ├─braavos-root (dm-0)  252:0    0   1.9G  0 lvm  /
  ├─braavos-local (dm-1) 252:1    0  12.6G  0 lvm  /usr/local
  └─braavos-swap (dm-2)  252:2    0   956M  0 lvm  [SWAP]

Running mountall --verbose on the failing machine image:

/ is local
/proc is virtual
/sys is virtual
/sys/fs/fuse/connections is virtual
/sys/kernel/debug is virtual
/sys/kernel/security is virtual
/dev is virtual
/dev/pts is virtual
/run is virtual
/run/lock is virtual
/run/shm is virtual
/boot is local
/usr/local is local
/dev/mapper/braavos-swap is swap
mounting event sent for /sys/fs/fuse/connections
mounting event sent for /sys/kernel/debug
mounting event sent for /sys/kernel/security
mounting event sent for /run/lock
mounting event sent for /run/shm
checking /boot
fsck from util-linux 2.20.1
checking /
checking /usr/local
fsck from util-linux 2.20.1
mounting event sent for swap /dev/mapper/braavos-swap
fsck from util-linux 2.20.1
/dev/mapper/braavos-root: clean, 51505/121920 files, 233327/487424 blocks
fsck / [779] exited normally
mounting event sent for /
/dev/vda1: clean, 230/121440 files, 40274/242688 blocks
fsck /boot [778] exited normally
mounting event sent for /
/dev/mapper/braavos-local: clean, 36/825776 files, 92681/3301376 blocks
fsck /usr/local [780] exited normally

And then it hangs...  This happens reliably, every time I select
'network'.  Pressing ctrl-c continues with the normal boot and
everything is mounted:

/dev/mapper/braavos-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
/dev/mapper/braavos-local on /usr/local type ext4 (rw)
/dev/vda1 on /boot type ext2 (rw)

I noticed that if I select the 'root' option which doesn't run mountall
and then manually run mountall --verbose, it works fine, but if I run
mountall --no-events --verbose, then it hangs.  The first event to get
"handled" when not using --no-events is they /sys event.

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https://bugs.launchpad.net/bugs/1099349

Title:
  mountall 2.36.3 hangs in recovery-menu (lvm; mountall 2.36 has no
  issue)

Status in “mountall” package in Ubuntu:
  Confirmed

Bug description:
  Fresh Ubuntu 12.04.1 amd64 install with the following partition layout / lvm setup:
  $ lsblk 
  NAME                            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
  sr0                              11:0    1  1024M  0 rom  
  sda                               8:0    0    20G  0 disk 
  ├─sda1                            8:1    0   243M  0 part /boot
  ├─sda2                            8:2    0     1K  0 part 
  └─sda5                            8:5    0  19.8G  0 part 
    ├─u1204--64-swap_1 (dm-0)     252:0    0  1020M  0 lvm  [SWAP]
    ├─u1204--64-root (dm-1)       252:1    0   7.6G  0 lvm  /
    └─u1204--64-usr--local (dm-2) 252:2    0  11.1G  0 lvm  /usr/local

  The installation works as expected and there are no imminent issues during normal usage.
  The issue is with the recovery menu. If someone boots into a rescue entry in the boot menu the rescue menu appears as expected but all entries that remount the root volume rw will hang on mountall.

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