Ubuntu
mountall package

mountall crashed with SIGSEGV in main() without initramfs

Bug #503212 reported by Scott Moser on 2010-01-05

This bug affects 7 people

Affects		Status	Importance	Assigned to	Milestone
	mountall (Ubuntu)	Fix Released	High	Steve Langasek	Ubuntu lucid-alpha-3
	Lucid	Fix Released	High	Steve Langasek	Ubuntu lucid-alpha-3

Bug Description

Binary package hint: mountall

I'm booting a system without a ramdisk, using 2.6.32-9-generic-pae . I see this failure on 32 or 64 bit. the console shows the following output:

[ 0.808201] VFS: Mounted root (ext3 filesystem) readonly on device 8:0.
[ 0.809808] devtmpfs: mounted
[ 0.810402] Freeing unused kernel memory: 568k freed
[ 0.818208] Write protecting the kernel text: 4736k
[ 0.824659] Write protecting the kernel read-only data: 1924k
init: ureadahead main process (51) terminated with status 3
mountall: Could not connect to Plymouth
init: mountall main process (52) killed by SEGV signal
General error mounting filesystems.
A maintenance shell will now be started.
CONTROL-D will terminate this shell and reboot the system.
Give root password for maintenance

I'm able to get past the immediate mountall failure if I boot with init=/bin/bash and then do something like:
mount -t proc /proc /proc
exec /sbin/init

That ends up booting, but then / is read-only.

I'm attaching an apport report file that I generated by booting with init=/bin/bash, then:
  mount -t proc /proc /proc
  mount -t tmpfs none /var/crash
  mount -t tmpfs none /var/log
  echo "|/usr/share/apport/apport %p %s %c" > /proc/sys/kernel/core_pattern
  umount /proc/
  ulimit -c unlimited
  exec /sbin/init

mountall dies, and init gives a maintainence prompt. I extracted the apport crash from /var/crash.

It looks as if mountall is relying on some of the mounts or setup that is done in an initramfs.

ProblemType: Crash
Architecture: i386
Date: Tue Jan 5 03:23:09 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /sbin/mountall
Package: mountall 2.3
ProcCmdline: mountall --daemon
ProcEnviron: PATH=(custom, no user)
ProcVersionSignature: Ubuntu 2.6.32-9.13-generic-pae
SegvAnalysis:
Segfault happened at: 0xb7782a43: mov 0x4(%edx),%esi
PC (0xb7782a43) ok
source "0x4(%edx)" (0x00000004) not located in a known VMA region (needed readable region)!
destination "%esi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: mountall
StacktraceTop:
?? () from /sbin/mountall
?? () from /sbin/mountall
?? () from /sbin/mountall
main () from /sbin/mountall
Tags: lucid
Title: mountall crashed with SIGSEGV in main()
Uname: Linux 2.6.32-9-generic-pae i686
UserGroups:

Tags:

Related branches

lp:~ion/ubuntu/lucid/mountall/lucid

Merged into lp:ubuntu/lucid/mountall

Scott James Remnant (Canonical): Pending requested 2010-01-05

Revision history for this message

Scott Moser (smoser) wrote on 2010-01-05:

Dependencies.txt Edit (667 bytes, text/plain; charset="utf-8")
Disassembly.txt Edit (503 bytes, text/plain; charset="utf-8")
ProcMaps.txt Edit (3.3 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (714 bytes, text/plain; charset="utf-8")
Registers.txt Edit (483 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (305 bytes, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (329 bytes, text/plain; charset="utf-8")

Revision history for this message

Apport retracing service (apport) wrote on 2010-01-05:

StacktraceTop:
find_mount (mountpoint=0xb778ecb4 "/proc") at mountall.c:424
mount_proc () at mountall.c:666
parse_filesystems () at mountall.c:838
main (argc=2, argv=0xbfb17aa4) at mountall.c:2969

Revision history for this message

Apport retracing service (apport) wrote on 2010-01-05: Stacktrace.txt

Stacktrace.txt Edit (601 bytes, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2010-01-05: ThreadStacktrace.txt

ThreadStacktrace.txt Edit (626 bytes, text/plain)

Changed in mountall (Ubuntu):
importance:	Undecided → Medium
tags:	removed: need-i386-retrace

Scott Moser (smoser) on 2010-01-05

summary:	- mountall crashed with SIGSEGV in main() + mountall crashed with SIGSEGV in main() without initramdisk
summary:	- mountall crashed with SIGSEGV in main() without initramdisk + mountall crashed with SIGSEGV in main() without initramfs

Scott Moser (smoser) on 2010-01-05

visibility:

private → public

Scott Moser (smoser) on 2010-01-05

tags:	added: ec2-images
Changed in mountall (Ubuntu):
importance:	Medium → High

Revision history for this message

Michael Marley (mamarley) wrote on 2010-01-07:

This also affects my non-initramfs custom kernel.

Revision history for this message

Michael Marley (mamarley) wrote on 2010-01-07:

Additionally, I just tried the patch. With the patch, mountall no longer segfaults, but instead it complains twice about some kind of failure (I forgot the text) and then it says "Ignoring x at user request" several times while x is all of my partitions. It still does not boot properly.

Revision history for this message

Johan Kiviniemi (ion) wrote on 2010-01-07:

It would be useful to know the error message you get twice.

Revision history for this message

Michael Marley (mamarley) wrote on 2010-01-07:

The full output from Mountall is:

mountall: Could not connect to Plymouth
mountall: Event failed
mountall: Event failed
Skipping / at user request
Skipping /tmp at user request
Skipping UUID=xxxx at user request

and then the system locks up in such a way that neither Ctrl+Alt+Del nor a short press of the power button have any result. Booting any kernel with an initramfs still works normally.

Thierry Carrez (ttx) on 2010-01-08

Changed in mountall (Ubuntu):
status:	New → Confirmed
Changed in mountall (Ubuntu Lucid):
milestone:	none → lucid-alpha-2

Revision history for this message

Lukas Hejtmanek (xhejtman) wrote on 2010-01-08:

#10

Same for me. I reverted mountall to version 1.0.1 and system boots again.

Steve Langasek (vorlon) on 2010-01-08

Changed in mountall (Ubuntu Lucid):
assignee:	nobody → Steve Langasek (vorlon)

Revision history for this message

Johan Kiviniemi (ion) wrote on 2010-01-09:

#11

Please try with the current version of the linked branch. Perhaps we’re lucky and I found all the bugs. :-P

Revision history for this message

Michael Marley (mamarley) wrote on 2010-01-09:

#12

No, the issue still occurs in exactly the same way that I reported above.

Revision history for this message

Johan Kiviniemi (ion) wrote on 2010-01-09:

#13

Michael,

Ah, I had missed the part about you running a custom kernel. Does mountall work for you with a standard Ubuntu kernel?

In any case, the issue you’re encountering should go to a separate bug report, since this one is about the segfault when mounting /proc.

When reporting it, please include the debug output from mountall. Add ‘--debug >/dev/mountall.log 2>&1’ to the ‘exec mountall ...’ line in /etc/init/mountall.conf and add sulogin.conf from http://upstart.ubuntu.com/wiki/OMGBroken, so you get a shell from which to get /dev/mountall.log to the bug report.

Steve,

It seems my branch fixes the actual bug this report is about (in addition to two other unrelated crashes).

Revision history for this message

Michael Marley (mamarley) wrote on 2010-01-09:

#14

Yes, the standard Ubuntu kernel works fine, as does my custom kernel if I compile with initramfs. Any kernel I have tried without the initramfs fails.

Revision history for this message

Thierry Carrez (ttx) wrote on 2010-01-11:

#15

The ramdiskless feature is blocked by bug 494565, which wasn't fixed in time for alpha-2 kernels. Remilestoning to alpha-3, however we still need this fixed as soon as possible to start exercising the feature against the post-alpha2 dailies.

Changed in mountall (Ubuntu Lucid):
milestone:	lucid-alpha-2 → lucid-alpha-3

Revision history for this message

Steve Langasek (vorlon) wrote on 2010-01-12:

#16

I'm not sure which of the bug #s my problem actually corresponds to, but I'm happy to report that the merge-proposed branch fixes the failure I've been seeing with mountall failing to mount NFS shares at boot time.

Revision history for this message

Launchpad Janitor (janitor) wrote on 2010-01-14:

#17

This bug was fixed in the package mountall - 2.4

---------------
mountall (2.4) lucid; urgency=low

  * conf/mountall-net.conf: only send SIGUSR1 to the main process, not to
    any pre-start or post-stop script we might have; killing the post-stop
    script with -USR1, though an unlikely race to hit, is definitely wrong.
    LP: #506902.

  [ Johan Kiviniemi ]
  * src/mountall.c: The mount table needs to exist for parse_filesystems
    - parse_filesystems() could call mount_proc(), which would call
      find_mount() and segfault. LP: #503212.
  * src/mountall.c: Handle TAG_UNKNOWN. LP: #505748.
  * src/mountall.c: Ensure boredom_timer is set to NULL when freeing
  * src/mountall.c: Default to no action for boredom query if prompt fails.
    LP: #505530.
-- Steve Langasek <email address hidden> Thu, 14 Jan 2010 05:30:13 -0800

Changed in mountall (Ubuntu Lucid):
status:	Confirmed → Fix Released

Revision history for this message

Michael Marley (mamarley) wrote on 2010-01-14:

#18

This is not fixed fully. It doesn't segfault anymore, but it just locks up and fails to boot.

Revision history for this message

Johan Kiviniemi (ion) wrote on 2010-01-14:

#19

Michael,

As I said, the issue you have should go to another bug report, since this one is about the segfault that was fixed.

You might be encountering bug #506727, for instance.

Revision history for this message

Scott Moser (smoser) wrote on 2010-01-19:

#20

I opened bug 509841 to address "fails to boot without ramdisk".

Revision history for this message

ZhengPeng Hou (zhengpeng-hou) wrote on 2010-01-28:

#21

got most likely the sam thing on armel, lucid 20090122 kubuntu-netbook + customized kernel, system stuck after init, shows
mountall: Event failed

Revision history for this message

Scott Moser (smoser) wrote on 2010-01-28: Re: [Bug 503212] Re: mountall crashed with SIGSEGV in main() without initramfs

#22

On Thu, 28 Jan 2010, ZhengPeng Hou wrote:

> got most likely the sam thing on armel, lucid 20090122 kubuntu-netbook +
> customized kernel, system stuck after init, shows
> mountall: Event failed

bug 509841, make sure your custom kernel has CONFIG_DEVTMPFS=y

Revision history for this message

Loïc Minier (lool) wrote on 2010-01-28:

#23

Exactly; I've researched this for a while, and turns out that /dev on tmpfs support is currently broken on upstart/mountall. Only /dev on devtmpfs works. See bug #513919.

Revision history for this message

Loïc Minier (lool) wrote on 2010-01-28:

#24

For custom kernel, pay attention to turn on CONFIG_CONNECTOR for netlink and CONFIG_INOTIFY.

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mountall crashed with SIGSEGV in main() without initramfs

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Ubuntu
mountall package