** Description changed: 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. + No high CPU usage, maybe no sftp.so process at all as the connection 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. + Feel free to contact me with questions, I can try to reproduce 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)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1764311 Title: KIO sftp high CPU usage after being left idle (endless loop?) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-runtime/+bug/1764311/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
