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[Juan Luis García Zapata <1764311@xxxxxxxxxxxxxxxxxx>]

Same problem: Dolphin sftp session open 12 hours (in a laptop,
suspending between worktimes). I end with several sftp.so processes with
high CPU use.

A workaround is to use fish protocol in the Dolphin tab.

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https://bugs.launchpad.net/bugs/1764311

Title:
  KIO sftp high CPU usage after being left idle (endless loop?)

Status in kde-runtime package in Ubuntu:
  Confirmed
Status in Arch Linux:
  New

Bug description:
  Dolphin was left open overnight being connected via sftp://user@host:port/folder/path.
  (Two targets, one continuously reachable under host:port, one went offline during the night)
  Returning to the PC I found 4 sftp.so processes consuming 50% of a CPU core each.
  They continued to do so after the folders in Dolphin were closed, and even after Dolphin itself was closed.
  They responded to SIGTERM.

  This is strace output from 1 of the processes, the same which apport
  was used on:

  ppoll([{fd=4, events=POLLIN}], 1, {tv_sec=0, tv_nsec=1000000}, NULL, 8) = 0 (Timeout)
  write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
  ppoll([{fd=4, events=POLLIN}], 1, {tv_sec=0, tv_nsec=1000000}, NULL, 8) = 0 (Timeout)
  write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
  ppoll([{fd=4, events=POLLIN}], 1, {tv_sec=0, tv_nsec=1000000}, NULL, 8) = 0 (Timeout)
  write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
  ppoll([{fd=4, events=POLLIN}], 1, {tv_sec=0, tv_nsec=1000000}, NULL, 8) = 0 (Timeout)
  write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
  ppoll([{fd=4, events=POLLIN}], 1, {tv_sec=0, tv_nsec=1000000}, NULL, 8) = 0 (Timeout)
  write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
  (continues to repeat, seems like its stuck in a loop)

  Kubuntu 18.04 Beta 2, kde-runtime (4:17.08.3-0ubuntu1)

  What I expected to happen:
  No high CPU usage, maybe no sftp.so process at all as the conenction was idle.

  What happened instead:
  4 sftp.so processes using 200% CPU of my quad core, consuming energy and shortening the lifespan of my system.

  Feel free to contact me with questions, I can try to reproduces the problem.
  Also I will leave one of the processes suspended for 1-3 days after filing this report, so I can send a SIGCONT and give further information on it if requested.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: kde-runtime 4:17.08.3-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  Date: Mon Apr 16 09:54:24 2018
  ExecutablePath: /usr/bin/kdeinit5
  ProcEnviron:
   
  SourcePackage: kde-runtime
  UpgradeStatus: Upgraded to bionic on 2018-04-10 (5 days ago)

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