I have here a script with which I was able to reproduce this issue on
Debian 7, Debian 9, Ubuntu 17.04 for rsync 3.1.2 (Ubuntu 17.04 apt repo)
and 3.1.3 (built from source).

https://pastebin.com/ctzJJGwt

It essentially creates a folder with 11.5k files of size 600KB and 10
files of size 200MB, however I think those 10 files are not necessary to
trigger the fault.

Using this command

rsync -avvvz --delete source_dir target_dir

I've also built rsync 3.0.9 which runs this command fine.

I suppose at this point it's a rsync issue, I will submit this to the
rsync bug tracker. For now using rsync 3.0.9 as a workaround is fine for
me. I appreciate any feedback if anyone else is able to reproduce this
issue using the supplied script.

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Touch seeded packages, which is subscribed to rsync in Ubuntu.
https://bugs.launchpad.net/bugs/1528921

Title:
  rsync hangs on select(5, [], [4], [], {60, 0}

Status in rsync package in Ubuntu:
  Confirmed

Bug description:
  In the last few months my home directory backup stopped completing.
  I've been able to reproduce the problem on a single subdirectory
  although I had to add the --debug=all flag to reproduce it on that
  smaller directory.  Specifically, this command never completes:

  rsync --debug=all -avz /tmp/html2 /tmp/rsynctest/

  The html2 directory is a copy of
  gnuradio-3.7.8.1/build/docs/doxygen/html .

  When I strace the command, I see this:
  write(1, "sender finished /tmp/html2/atsc_"..., 58sender finished 
/tmp/html2/atsc__interleaver_8h__incl.md5
  ) = 58
  write(1, "send_files(338, /tmp/html2/atsc_"..., 59send_files(338, 
/tmp/html2/atsc__interleaver_8h__incl.png)
  ) = 59
  open("html2/atsc__interleaver_8h__incl.png", O_RDONLY|O_LARGEFILE) = 3
  fstat64(3, {st_mode=S_IFREG|0664, st_size=264657, ...}) = 0
  write(1, "html2/atsc__interleaver_8h__incl"..., 
37html2/atsc__interleaver_8h__incl.png
  ) = 37
  read(3, 
"\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\n\253\0\0\2\233\10\6\0\0\0h\242\""..., 
262144) = 262144
  select(6, [5], [4], [5], {60, 0})       = 2 (in [5], out [4], left {59, 
999996})
  read(5, 
"\0\0\0\0\0\0\0\1\0\240\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\240\0\0\0"..., 95) 
= 95
  write(4, 
"r\311\0\7\177\377\232\237\264\272e\300\300\240\316\264&\314\301\252*\37\256y\225g\373^\315j\370\350"...,
 51574) = 51574
  select(5, [], [4], [], {60, 0})         = 1 (out [4], left {59, 999997})
  write(4, 
"\7\320\0\7\177\377\234|\7X\223Y\273\255c\27\25f\306\212\202\214#E\272\212t\1\225A\fU"...,
 53259) = 53259
  select(5, [], [4], [], {60, 0}

  The select command times out over and over.  I get the same behavior
  when trying to back up my entire home directory but I don't need the
  --debug=all flag in that case.


  lsb_release -rd
  Description:    Ubuntu 14.04.3 LTS
  Release:        14.04

  apt-cache policy rsync
  rsync:
    Installed: 3.1.0-2ubuntu0.1
    Candidate: 3.1.0-2ubuntu0.1
    Version table:
   *** 3.1.0-2ubuntu0.1 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main i386 
Packages
          500 http://security.ubuntu.com/ubuntu/ trusty-security/main i386 
Packages
          100 /var/lib/dpkg/status
       3.1.0-2 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: rsync 3.1.0-2ubuntu0.1
  ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
  Uname: Linux 3.13.0-74-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CurrentDesktop: KDE
  Date: Wed Dec 23 09:44:17 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2010-09-18 (1922 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
  SourcePackage: rsync
  UpgradeStatus: Upgraded to trusty on 2014-12-27 (361 days ago)

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