[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Launchpad Bug Tracker]

This bug was fixed in the package nano - 2.4.2-1ubuntu0.1

---
nano (2.4.2-1ubuntu0.1) wily; urgency=medium

  * d/p/trim-long-hostname.patch:
- Cherry pick upstream fix for a hostname that is longer than expected,
  fixing crash (LP: #1509081).

 -- Marc Deslauriers   Tue, 08 Dec 2015
10:10:10 -0500

** Changed in: nano (Ubuntu Wily)
   Status: Fix Committed => Fix Released

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

Unpacking nano (2.4.2-1ubuntu0.1) over (2.4.2-1) ...


Re-enabled locking and now nano doesn't segfault (in default config) on the 
target machine

Tag updated :)

Thankyou!

** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Chris J Arges]

Hello reedy, or anyone else affected,

Accepted nano into wily-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/nano/2.4.2-1ubuntu0.1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: nano (Ubuntu Wily)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Marc Deslauriers]

Uploaded same fix to Wily for processing by the SRU team.

** Description changed:

+ [Impact]
+ 
+ On systems with a long hostname, nano either segfaults or refuses to
+ work properly.
+ 
+ [Test Case]
+ 1- set a long hostname with "hostname thisisareallyreallyreallylonghostname"
+ 2- try and edit a file: "nano /etc/hosts"
+ 3- make sure there is no segfault, or error in nano window: "Couldn't 
determine host name..."
+ 
+ [Regression Potential]
+ 
+ Patch is quite simple an obvious. A regression would mean lock files
+ wouldn't work properly.
+ 
+ 
+ 
+ 
+ 
+ Original description:
+ 
  Description:  Ubuntu 15.10
  Release:  15.10
  
  nano:
-   Installed: 2.4.2-1
-   Candidate: 2.4.2-1
-   Version table:
-  *** 2.4.2-1 0
- 500 http://mirror.bytemark.co.uk/ubuntu/ wily/main amd64 Packages
- 100 /var/lib/dpkg/status
+   Installed: 2.4.2-1
+   Candidate: 2.4.2-1
+   Version table:
+  *** 2.4.2-1 0
+ 500 http://mirror.bytemark.co.uk/ubuntu/ wily/main amd64 Packages
+ 100 /var/lib/dpkg/status
  
- 
- After upgrading Ubuntu 15.04 to 15.10, when I run nano as root on a file it 
just segfaults. I'm not having this problem on other 15.04->15.10 upgrades
+ After upgrading Ubuntu 15.04 to 15.10, when I run nano as root on a file
+ it just segfaults. I'm not having this problem on other 15.04->15.10
+ upgrades
  
  strace is https://p.defau.lt/?q7xGwt3HoqB74xTawUUHDA
  catchsegv is https://p.defau.lt/?0SPQY_bDj6F6j1ZKeToQoA
- 
  
  Under gdb with nano-dbgsym installed, it gives
  
  #0  main (argc=2, argv=0x7fffe688) at ../../src/nano.c:2768
  
- 
- If I run it as sudo nano filename.txt, it gives an error as below rather than 
segfaulting
+ If I run it as sudo nano filename.txt, it gives an error as below rather
+ than segfaulting
  
  [ Couldn't determine hostname for lock file: File name too long ]
  
- 
  Both my user and root have the same locale settings. I've tried
  regenerating the locales

** Changed in: nano (Ubuntu Wily)
   Status: New => In Progress

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Michael Terry]

Benno, thanks for the patch!  I've uploaded it to xenial, which will be
16.04.

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

Any chance we could get it backported to 15.10 too please?

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Michael Terry]

** Also affects: nano (Ubuntu Wily)
   Importance: Undecided
   Status: New

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Launchpad Bug Tracker]

This bug was fixed in the package nano - 2.4.2-1ubuntu1

---
nano (2.4.2-1ubuntu1) xenial; urgency=medium

  [ Benno Schulenberg ]
  * d/p/trim-long-hostname.patch:
- Cherry pick upstream fix for a hostname that is longer than expected,
  fixing crash (LP: #1509081).  Can be dropped with 2.4.3.

 -- Michael Terry   Mon, 07 Dec 2015 16:28:36 -0500

** Changed in: nano (Ubuntu)
   Status: Confirmed => Fix Released

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Mathew Hodson]

** Changed in: nano (Ubuntu Wily)
   Importance: Undecided => High

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Mathew Hodson]

** Changed in: nano (Ubuntu)
   Importance: Undecided => High

** Tags added: wily

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Arthur Khasanov]

Wow, thanks for reply.

I've pressed affect link :)

And "comment out the "set locking" in your /etc/nanorc file." - had
helped me :)

Thanks again !

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

> I've got the same error.

Then please click at the top of this page that you are affected too.

> Could you please provide patch's URL

You can find the patch somewhere on the right.  But this is the direct
URL:

https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1509081/+attachment/4513318/+files
/trim-an-overlong-hostname.patch

> and how-to install ?

No.  You will have to google how to get the source, apply the patch,
compile, and install.  Or wait for Ubuntu to apply the patch and push it
out.  Or change your hostname to something shorter.  Or comment out the
"set locking" in your /etc/nanorc file.

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Arthur Khasanov]

Hello !
I've got the same error.
Could you please provide patch's URL and how-to install ?

Thanks.

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

** Tags added: patch-accepted-upstream

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

** Patch removed: "trims an overlong hostname instead of complaining"
   
https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1509081/+attachment/4513012/+files/trim-long-hostname.patch

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

The patch works!

Got a little confused by caching of the paths, which was returning
/usr/local/bin/nano, but without the qualified path, it was using
/bin/nano. Easily fixed

What happens next? I noticed your thread over at
https://lists.gnu.org/archive/html/nano-devel/2015-11/msg0.html - I
guess a patch to their svn, and then something related in debian/ubuntu
repo? Then poking someone to get a new package built and distributed?


Thanks!

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

Post sent to nano-devel too

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

> The patch works!

Thanks for testing.  The patch will go into SVN soon, it will be in
2.4.3.  But this newer version will not make it into Wily, so some
Ubuntu maintainer will have to apply the attached patch to 2.4.2 and
release an updated ubuntu version of nano-2.4.2.

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

Yup, 15.10 seems to. I have never edited the /etc/nanorc file, so I
guess it was just updated to the default package maintainers version as
per the usual. So the grep gives the obvious output:

reedy@ko-kra:~$ grep locking /etc/nanorc 
set locking
reedy@ko-kra:~$

Yeah, I ended up applying the patch by hand. I guess debugging tired (on
unfamiliar source code). I should have really noticed what the issue
was!

Will try the patch again on the source from the 15.10 apt repo


Will post the ./configure stuff to nano-devel; that's fine by me. Certainly no 
config on my part, rather than just installing the necessary packages 
(libncurses dev packages, dh-autoconf etc)

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

> ./configure: line 8316: syntax error near unexpected token `NCURSESW,'
> ./configure: line 8316: ` PKG_CHECK_MODULES(NCURSESW, ncursesw,'

Oh dear, autoconf stuff.  Could you post your ./configure to nano-devel
-- this error not directly related to this bug, so let's take it
elsewhere.  On that list (https://lists.gnu.org/mailman/listinfo/nano-
devel) there will be people who understand autoconf.

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

> but it is in the /etc/nanorc file

Ubuntu sets 'locking' by default?  What's the output of 'grep locking
/etc/nanorc'?

> files.c: In function ‘write_lockfile’:
> files.c:149:6: error: label ‘free_and_fail’ used but not defined
>   goto free_and_fail;

Ah.  But then applying the patch should have failed.  Did you edit the
file by hand?

Nevermind.  See the updated patch for version 2.4.2.  (Yes, sorry, SVN
is far ahead of 2.4.2 -- there should have been a 2.4.3 two months ago.)


** Patch added: "trims an overlong hostname instead of complaining"
   
https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1509081/+attachment/4513318/+files/trim-an-overlong-hostname.patch

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

Can you attach a strace of a run of 'nano --ignore' (without a
filename)?  Is your computer part of some network, does it need to ask
the network about its hostname?  What is the output of 'env | grep
MALLOC'?

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

Sorry, that was a silly request.  What is needed of course is a strace
of: 'nano --ignore --locking filename'.

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

Yay, rabbit holes...

Checked out from svn, extra packages installed, run autogen, then
./configure is giving

./configure: line 8316: syntax error near unexpected token `NCURSESW,'
./configure: line 8316: `   PKG_CHECK_MODULES(NCURSESW, ncursesw,'
root@ko-kra:~/nano# dpkg -l | grep ncurses
ii  libncurses5:amd64   5.9+20150516-2ubuntu1   amd64   
 shared libraries for terminal handling
ii  libncurses5-dev:amd64   5.9+20150516-2ubuntu1   amd64   
 developer's libraries for ncurses
ii  libncursesw5:amd64  5.9+20150516-2ubuntu1   amd64   
 shared libraries for terminal handling (wide character support)
ii  libncursesw5-dev:amd64  5.9+20150516-2ubuntu1   amd64   
 developer's libraries for ncursesw
ii  mtr-tiny0.85-3  amd64   
 Full screen ncurses traceroute tool
ii  ncurses-base5.9+20150516-2ubuntu1   all 
 basic terminal type definitions
ii  ncurses-bin 5.9+20150516-2ubuntu1   amd64   
 terminal-related programs and man pages
ii  ncurses-term5.9+20150516-2ubuntu1   all 
 additional terminal type definitions
root@ko-kra:~/nano#

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

Neither root, nor my user have a .nanorc file, but it is in the
/etc/nanorc file

Thought I'd just use `apt-get source nano` on wily, but seems that's a
few revisions behind the svn repo, as free_and_fail doesn't seem to be
defined (else something else is out of date/out of sync)


.deps/files.Tpo -c -o files.o files.c
files.c: In function ‘write_lockfile’:
files.c:149:6: error: label ‘free_and_fail’ used but not defined
  goto free_and_fail;
  ^


Will try getting the svn sources and try that


Thanks!

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[oxishmit]

I suggest you to try Long Path Tool.

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

How does the long path tool help? It worked before on 15.04 (and
before), but broke upgrading to 15.10... It shouldn't segfault!

env | grep MALLOC returns nothing


nano --ignore works fine...

`strace -o nano.txt nano --ignore` is
http://p.defau.lt/?ggvjOCTok9EfbnKi_XNNBA


My computer is a vm from Bytemark over on their bigv platform 
https://www.bigv.io/ - I don't think it needs to ask the network about its 
hostname... How would I even verify this?


Thanks

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

But yeah, nano --ignore works via sudo or as root

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Title:
  nano segfaults as root after upgrade to 15.10

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[reedy]

`strace -o nano2.txt nano --ignore --locking filename.txt` is
http://p.defau.lt/?T04ctRlETH_GkL6kEuqSLA

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Title:
  nano segfaults as root after upgrade to 15.10

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Benno Schulenberg]

> It worked before on 15.04 (and before), but broke upgrading to
15.10...

Well, on 15.04 (nano-2.2.6), nano didn't have any file locking.

> env | grep MALLOC returns nothing

Good.

> nano --ignore works fine...

It should, because it ignores the 'set locking' that uou have in your
.nanorc. As a temporary measure you can comment out that setting.

> My computer is a vm from Bytemark over on their bigv platform

Well, when it's a virtual machine, then it's not really a computer.  :)
And yes, then it's likely that it gets its hostname over the network.
But it doesn't matter.  If you can compile from source, please try the
attached patch.

** Patch added: "trims an overlong hostname instead of complaining"
   
https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1509081/+attachment/4513012/+files/trim-long-hostname.patch

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Title:
  nano segfaults as root after upgrade to 15.10

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Ubuntu Foundations Team Bug Bot]

The attachment "trims an overlong hostname instead of complaining" seems
to be a patch.  If it isn't, please remove the "patch" flag from the
attachment, remove the "patch" tag, and if you are a member of the
~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issues please contact him.]

** Tags added: patch

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Title:
  nano segfaults as root after upgrade to 15.10

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Hitechcomputergeek]

I'm getting this too. When I tried to nano my ~/bashrc file (just as me,
not as root), the first two times it segfaulted. The third (and any
later) times, now it displays "Couldn't determine hostname for lock
file: File name too long" for ANY file I try to open or create. Upgraded
from Ubuntu 15.04 to 15.10 two days ago. Attached is the crash log that
apport created when nano segmentation faulted the first two times.

** Attachment added: "crash log"
   
https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1509081/+attachment/4506693/+files/_bin_nano.1000.crash

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Title:
  nano segfaults as root after upgrade to 15.10

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Hitechcomputergeek]

I forgot to mention, now I get "Couldn't determine hostname for lock
file: File name too long" when I try to run nano as both me AND root.

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Title:
  nano segfaults as root after upgrade to 15.10

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[Bug 1509081] Re: nano segfaults as root after upgrade to 15.10

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: nano (Ubuntu)
   Status: New => Confirmed

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Title:
  nano segfaults as root after upgrade to 15.10

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