[Bug 1528921] Re: rsync hangs on select(5, [], [4], [], {60, 0}

[ipkpjersi]

I can replicate this issue on Ubuntu 18.04 with kernel
4.15.0-101-generic x86_64 and rsync 3.1.2 protocol version 31.

As a workaround for rsync verbose logging with the -vvv flag, you can
instead pass rsync to strace for tracing the system calls and signals
made by rsnc by running "sudo strace rsync". You can still see the
commands and params that are being used by rsync much like -vvv except
strace does not cause it to get stuck syncing plus if you have some
other sort of timeout, strace will also show that.

I hope this is helpful to at least one person reading this looking for a
workaround.

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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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