[Bug 1553353] Re: tail'ing a file in a script session hangs

[Bug Watch Updater]

** Changed in: util-linux (Debian)
   Status: Confirmed => Fix Released

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Bug Watch Updater]

** Changed in: util-linux (Debian)
   Status: New => Confirmed

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Launchpad Bug Tracker]

This bug was fixed in the package util-linux - 2.27.1-6ubuntu3

---
util-linux (2.27.1-6ubuntu3) xenial; urgency=medium

  * Add debian/patches/script-use-empty-slave.patch taken from
upstream git (LP: #1553353, Closes: #820843)

 -- Simon Deziel   Wed, 13 Apr 2016 15:01:21
+

** Changed in: util-linux (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Martin Pitt]

... and sponsored, thanks Simon!

** Changed in: util-linux (Ubuntu Xenial)
   Status: Confirmed => Fix Committed

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Ubuntu Foundations Team Bug Bot]

The attachment "lp1553353.debdiff" seems to be a debdiff.  The ubuntu-
sponsors team has been subscribed to the bug report so that they can
review and hopefully sponsor the debdiff.  If the attachment isn't a
patch, please remove the "patch" flag from the attachment, remove the
"patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe
the team.

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

** Tags added: patch

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Simon Déziel]

The Debian maintainer forwarded the bug upstream and they fixed it right
away. So here's a debdiff that fixes the problem for me. I uploaded it
to my PPA and it successfully built on amd64 [1] but not i386 [2].

On i386 the libmount/lock test failed so it seems unrelated to this new
commit. It's the only test that failed out of the 170 that were
executed.

1: https://launchpad.net/~sdeziel/+archive/ubuntu/ppa/+build/9571252
2: https://launchpad.net/~sdeziel/+archive/ubuntu/ppa/+build/9571253

** Patch added: "lp1553353.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1553353/+attachment/4635719/+files/lp1553353.debdiff

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Bug Watch Updater]

** Changed in: util-linux (Debian)
   Status: Unknown => New

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Simon Déziel]

** Bug watch added: Debian Bug tracker #820843
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820843

** Also affects: util-linux (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820843
   Importance: Unknown
   Status: Unknown

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Simon Déziel]

** Description changed:

  Steps to reproduce:
  
  1) Start script session (same issue when script is saving to /dev/null)
  script # or: script /dev/null
  2) Tail a file
- tail -f /var/log/syslog
+ tailf /var/log/syslog
  3) Press "Enter" 2 times
  4) Notice the script process taking 100% CPU
  
- This regression is rather new but I don't know which update introduced
- it. Reverting util-linux/bsdutils to the previous version doesn't help
- so maybe it's not even script's fault. tail/coreutils hasn't been update
- in a long time so I'm not sure who's fault it is. I can reproduce the
- problem with kernel 4.4.0-9-generic and 4.4.0-10-generic.
- 
+ This regression was introduced upstream by this commit:
+ https://git.kernel.org/cgit/utils/util-linux/util-
+ linux.git/commit/?id=54c6611d6f7b73609a5331f4d0bcf63c4af6429e
  
  $ lsb_release -rd
  Description:  Ubuntu Xenial Xerus (development branch)
  Release:  16.04
  
  $ apt-cache policy util-linux bsdutils coreutils
  util-linux:
-   Installed: 2.27.1-4ubuntu1
-   Candidate: 2.27.1-4ubuntu1
-   Version table:
-  *** 2.27.1-4ubuntu1 500
- 500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
Packages
- 100 /var/lib/dpkg/status
-  2.27.1-3ubuntu1 500
- 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+   Installed: 2.27.1-4ubuntu1
+   Candidate: 2.27.1-4ubuntu1
+   Version table:
+  *** 2.27.1-4ubuntu1 500
+ 500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
Packages
+ 100 /var/lib/dpkg/status
+  2.27.1-3ubuntu1 500
+ 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  bsdutils:
-   Installed: 1:2.27.1-4ubuntu1
-   Candidate: 1:2.27.1-4ubuntu1
-   Version table:
-  *** 1:2.27.1-4ubuntu1 500
- 500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
Packages
- 100 /var/lib/dpkg/status
-  1:2.27.1-3ubuntu1 500
- 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+   Installed: 1:2.27.1-4ubuntu1
+   Candidate: 1:2.27.1-4ubuntu1
+   Version table:
+  *** 1:2.27.1-4ubuntu1 500
+ 500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
Packages
+ 100 /var/lib/dpkg/status
+  1:2.27.1-3ubuntu1 500
+ 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  coreutils:
-   Installed: 8.25-2ubuntu2
-   Candidate: 8.25-2ubuntu2
-   Version table:
-  *** 8.25-2ubuntu2 500
- 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
- 100 /var/lib/dpkg/status
+   Installed: 8.25-2ubuntu2
+   Candidate: 8.25-2ubuntu2
+   Version table:
+  *** 8.25-2ubuntu2 500
+ 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+ 100 /var/lib/dpkg/status
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: util-linux 2.27.1-4ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-10.25-generic 4.4.3
  Uname: Linux 4.4.0-10-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Mar  4 15:14:15 2016
  SourcePackage: util-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Simon Déziel]

The above commit is from Debian's git. The problem still exists upstream
in https://git.kernel.org/cgit/utils/util-linux/util-
linux.git/commit/?id=44338f7fe6a529cef1f206dccd95e7282625c483

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Simon Déziel]

FYI, the current master (d38bcd109e9) still has the problem.

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Simon Déziel]

After bisecting util-linux, the problematic commit is:

54c6611d6f7b73609a5331f4d0bcf63c4af6429e is the first bad commit
commit 54c6611d6f7b73609a5331f4d0bcf63c4af6429e
Author: Karel Zak 
Date:   Wed Jun 17 15:48:50 2015 +0200

script: fix EOF problems

* remove STDIN from poll() if:

  * STDIN already closed -- poll returns POLLHUP, for example:

echo "date" | script

  * detect EOF as returned by read(), for example:

script -c "echo Hello" < /dev/null

* don't write to master when there is still something to read from
  slave (it means shell is not initialized yet or busy)

Signed-off-by: Karel Zak 

:04 04 2cc2b7f5d69f16775151517912dce6ff3a586847
b1a8465b2c3f23c0f41bfb7308af49b92963e77b M  term-utils


When using v2.27.1 and reverting just this commit, all is fine.

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Brian Murray]

** Tags added: regression-release

** Also affects: util-linux (Ubuntu Xenial)
   Importance: High
   Status: Confirmed

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Title:
  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Alberto Salvia Novella]

** Changed in: util-linux (Ubuntu)
   Importance: Undecided => High

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Ayan George]

16.04 is using linux util tagged at v2.27.1.  I can reproduce the
problem using the git source at tag 2.27.1 forward.  The bug doesn't
occur in v2.26.2 so this looks like a regression.

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Ayan George]

Killing tail stops the runaway poll().  It might help to see what tail
is doing as well.

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Ayan George]

Ah -- I've been able to reproduce it.  I'll run it in a debugger and see
if I can isolate the problem.

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Simon Déziel]

On 2016-03-05 12:10 AM, Pádraig Brady wrote:
> Reproduced with script 2.27.1 which spins in this case continually
> doing:
> 
> poll([{fd=4, events=POLLIN}], 1, 10)= 1 ([{fd=4, revents=POLLIN}])

Yes, that's what strace'ing reveals in my case.


** Changed in: util-linux (Ubuntu)
   Status: New => Confirmed

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Pádraig Brady]

Reproduced with script 2.27.1 which spins in this case continually
doing:

poll([{fd=4, events=POLLIN}], 1, 10)= 1 ([{fd=4, revents=POLLIN}])

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  tail'ing a file in a script session hangs

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[Bug 1553353] Re: tail'ing a file in a script session hangs

[Ayan George]

I couldn't reproduce it.  Can you post strace output of script?  There
will be more than one script process -- chose the one that is consuming
100% CPU and run something like:

$ strace -tt -p  >/tmp/strace.out

Let it run for about 15 seconds and exit.  Then upload the output.

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  tail'ing a file in a script session hangs

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