Finally figured out what's going on here! I'm now on a different
computer, and getting the same bug again; but it behaves slightly
differently here. This computer has an ext4 filesystem originally
created by Ubuntu Karmic, and has a rather smaller main partition
(relevant to how I noticed what was going on); but the same thing's
happening. (And yes, I'm now suspicious that the blame is mostly
mountall's.)
What happens here if I don't press ESC to abort a scheduled fsck is
exactly the same; it appears to proceed as normal until 89% (which goes
very quickly on this computer, thus making it easier to test), the hard
drive activity light goes off, the fsck progress goes to 90% after
several minutes, and the system apparently completely hangs thereafter.
However, after waiting for another half-hour or so, during which the
system is apparently completely hung, the progress bar goes to 91%, and
picks up thereafter, with the boot finally completed.
Pressing ESC works differently on this machine, though; instead of
aborting the fsck, it switches to tty1, gives an error message ("General
error mounting filesystems."), and drops me to a root prompt, with the
advice that control-D should retry. After pressing control-D, the fsck
resumes not at 0%, but at whatever percentage it was at when I press
ESC; it's as if the fsck was not stopped at all, but only suspended
(which, if true, would at least explain why the filesystems failed to
mount).
As a test, I tried interrupting a scheduled fsck with ESC, restarting it with
control-D, interrupting the same FSCK again, restarting it again with
control-D, and finally waiting until the fsck completed (including the huge
hang at 89-91% for no apparent reason and with no hard drive activity). This is
a dump of tty1 obtained after the boot sequence ended (obtained via /dev/vcs1):
{{{
General error mounting filesystems.
A maintenance shell will now be started.
CONTROL-D will terminate this shell and re-try.
r...@desert:~# exit
mountall start/starting
fsck from util-linux-ng 2.16
swapon: /dev/disk/by-uuid/93f82bd9-13ba-48d0-b6e0-d56326ae15ea: swapon failed:
Device or resource busy
mountall: swapon /dev/disk/by-uuid/93f82bd9-13ba-48d0-b6e0-d56326ae15ea [1003]
terminated with status 255
mountall: Problem activating swap:
/dev/disk/by-uuid/93f82bd9-13ba-48d0-b6e0-d56326ae15ea
/dev/sda5 has been mounted 25 times without being checked, check forced.
Filesystem checks are in progress (ESC to cancel):
[#######-----------------------------------------------------]
mountall: Cancelled
/dev/sda5: e2fsck canceled.
fsck.ext4: Inode bitmap not loaded while setting block group checksum info
mountall: fsck / [1001] terminated with status 8
mountall: General fsck error
init: mountall main process (1000) terminated with status 1
General error mounting filesystems.
A maintenance shell will now be started.
CONTROL-D will terminate this shell and re-try.
r...@desert:~# exit
mountall start/starting
fsck from util-linux-ng 2.16
swapon: /dev/disk/by-uuid/93f82bd9-13ba-48d0-b6e0-d56326ae15ea: swapon failed:
Device or resource busy
mountall: swapon /dev/disk/by-uuid/93f82bd9-13ba-48d0-b6e0-d56326ae15ea [1042]
terminated with status 255
mountall: Problem activating swap:
/dev/disk/by-uuid/93f82bd9-13ba-48d0-b6e0-d56326ae15ea
/dev/sda5 has been mounted 25 times without being checked, check forced.
Filesystem checks are in progress (ESC to cancel):
/dev/sda5: 1968337/4784128 files (0.2% non-contiguous), 13948395/19129390 blocks
Ubuntu 9.10 desert tty1
desert login:
}}}
Hopefully this is enough information to debug what's going on here.
** Changed in: mountall (Ubuntu)
Status: Invalid => New
** Summary changed:
- Scheduled fsck during boot hangs at 90%, preventing boot sequence completing
+ Scheduled fsck during boot unresponsive and inactive for a very long time at
90%, making the system appear to hang
--
Scheduled fsck during boot unresponsive and inactive for a very long time at
90%, making the system appear to hang
https://bugs.launchpad.net/bugs/487744
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