http://bugzilla.suse.com/show_bug.cgi?id=1116568 Bug ID: 1116568 Summary: yast2 hostnames can freeze OS Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: YaST2 Assignee: yast2-maintainers@suse.de Reporter: agraul@suse.com QA Contact: jsrain@suse.com Found By: --- Blocker: --- Created attachment 790163 --> http://bugzilla.suse.com/attachment.cgi?id=790163&action=edit script to generate hosts files ## Summary I've observed that the yast process' memory usage can grow to levels that stop the whole operating system from responding. Even "magic SysRq" key combinations are not handled correctly. ## What did I do? I was looking into profiling `yast2 host` using rbspy. I already did so in a VM, but wanted to compare that result to one from laptop directly. You can see my laptop specs below. To see what takes time with parsing/displaying the hostname and IP-address combinations I used a /etc/hosts file with 10.000 lines. Each had one IP, one hostname and three aliases, generated by a python script (attached). I monitored the process using htop, filtering for ruby (no other ruby process was running during the time) and attached rbspy to it (rbspy record --pid $PID_TAKEN_FROM_HTOP). ## What did I observe? While the loading time of the 10.000 lines was already really long on the VM (~ 13min), after 30min the loading was not finished on my laptop. One CPU thread was at 100% whenever I checked it and memory usage grew. Before the laptop became unresponsive, I saw more than 12 GiB of memory used by ruby (non-swapped). My laptop started to take a long time for tasks like changing focus and the background music I had running started to stutter. I left the computer running for a few minutes, then realized it probably would not respond anytime soon. I tried the "magic SysRq" combination "REISUB", but that did not do anything I could observe, so I hard-reset the laptop. ## Laptop Specs Dell Latitude 7480 RAM: 15.5 GiB SWAP: 8 GiB CPU: 4 × Intel® Core™ i7-6600U CPU @ 2.60GHz OS: openSUSE Tumbleweed 20181112 -- You are receiving this mail because: You are on the CC list for the bug.