** Description changed: When developing an application using serial ports, behaviour between process restarts is undefined for particular usb serial port chipsets. Tested chipsets to fail are: * pl2303H * ftdi Tested chipsets to work are: * 16550A * pl2303ra Attached is a minimal test program to recreate the issue. The program needs to run twice, the first to create the problem, the second instance that shows the problem. See the comments at the beginning of the test program to see expected output and observed output. + + You'll need the device under question attached and running as the + receiver in the test program and a NULL modem cable (3 wire). Easiest to + show the problem if you have two of the same USB devices attached and + execute the command with "./a.out /dev/ttyUSB0 /dev/ttyUSB1". Note, flushing, and other workarounds haven't worked, only physically removing and reinserting the problematic devices between runs (in particular, the device that is receiving the data over the serial port). As there appears to be data in a buffer between runs that can't be properly flushed, I can't say if this is a potential security issue or not. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.19.0-49-generic 3.19.0-49.55~14.04.1 ProcVersionSignature: Ubuntu 3.19.0-49.55~14.04.1-generic 3.19.8-ckt12 Uname: Linux 3.19.0-49-generic i686 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: i386 CurrentDesktop: Unity Date: Sun Feb 7 15:28:42 2016 InstallationDate: Installed on 2016-02-04 (2 days ago) InstallationMedia: - + SourcePackage: linux-lts-vivid UpgradeStatus: No upgrade log present (probably fresh install)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1542862 Title: pl2303h and ftdi serial port bug To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-vivid/+bug/1542862/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
