I'm writing this comment on behalf of someone that does experience the problem and have tested the test kernel (Wily kernel with commit e81107d) by Joseph Salisbury.
Here is the feedbacks: --- Hello, We examined whether the provided kernel works on Ubuntu 15.10 by running our test program. 4.2.0-16 kernel: The problem occurred 30 times at 630 running. 4.2.0-17.21~lp1512815 kernel: 0 time at 100000 running. (We didn't install linux-cloud-tools packages.) We think the fixed kernel works fine. By the way, if you are referencing 3.18.23, there is an extra spin_unlock_irqrestore() which should be removed by http://pastebin.com.keephe.com/L14RzUcF ,so please be aware. We will wait for a kernel backported for Ubuntu 14.04 LTS (x86_64). --- -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1512815 Title: read() from pty doesn't finish. Status in linux package in Ubuntu: In Progress Bug description: It has been brought to my attention By the attached test program pty, a pair of process repeats writing and reading only '\n' to a master pseudoterminal device (/dev/ptmx) and a slave pseudoterminal device (/dev/pts/N) each. When we carry out the following 30 pairs 10,000 times, in a pair each process doesn't finish reading. $ pty 30 The following message will be usually indicated immediately. #name copy num/sec usec/num pty_switch 30 1541842 0.648575 When a message wasn't indicated any more, we got the attached dump file. A kernel was 3.13.0-45.74. A system was Ubuntu 14.04 LTS. The same problem occurred in case of 3.13.0-55.92 kernel and the following kernel have been tested as well: 2.6.32, 3.10: not reproduces. 3.19, 4.0.0, 4.1.3: reproduces. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1512815/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
