[Bug 1096307] Re: Boot process hang because 'mountall' fails

[Ed Huang]

Hi Steve, this issue can be easily reproduced through either of the following scenario on Ubuntu 12.04.
Assuming Ubuntu 12.04 is located as /sda2, and I have two HDD connected as sda, sdb. sdb4 is formatted as ext4

1. Adding one entry in /etc/fstab which will try to mount a non-existing disk device node. Simulate as failure partition
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/sdc4           /test                  ext2       defaults           0               0

2. Intentionally corrupt a working partition through DD command to simulate a disk/partition error
    dd if=/dev/zero of=/dev/sdb4 bs=1M count=100
    Then add an entry to found the failure partition
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/sdb4           /disk1                  ext2        defaults           0               0

 In either case, we saw system got stuck during mount procedure without
any message indicating which partition or disk is having problem and
never reach the login prompt.

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https://bugs.launchpad.net/bugs/1096307

Title:
    Boot process hang because 'mountall' fails

Status in “mountall” package in Ubuntu:
  Incomplete

Bug description:
  We suspect a bug in Ubuntu 12.04 where boot process is hanged because ‘mountall’ fails due to an HDD failure.
    The issue can be easily reproduced through either of the following scenario on Ubuntu 12.04

    1. Mount a non-existing disk device node. 
    2. Disk/partition error. You can simulate such error by corrupting a working partition using DD command.

    In either case, you will see system stuck at mount procedure and never reach the login prompt. 
    I have tried some option like “timeout=30”, “optional”, update mountall to v2.46. But none of them is working.

    Thanks

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