Hi guys I can try to find the reeason of crash if you will provide simple example.
BR, Roman. 2015-04-14 15:38 GMT+03:00 Tim Peeters <tim.peet...@canonical.com>: > Hi Robert, > > Like in Python, crashes with QML code are also not common. I wrote the > code for displaying the sections in the header and it is all QML. From the > fix you proposed, it appears that selectedIndex (and sort) property is > undefined some times. Are you using the value of that property somewhere in > C++? > > A simpler test program to reproduce the issue would be very helpful. This > month I am going to factor out some code from the PageHeadStyle, and create > a separate component for the sections, so then I can look into this issue > as well, and perhaps it will make it easier to debug. It is difficult to > tell where the bug is, but if it appears to come from UITK, can you report > it as a bug here > https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-toolkit so we can > report future findings about the cause there also? > > Thanks, > Tim. > > On Sun, Apr 12, 2015 at 11:13 PM, Robert Schroll <rschr...@gmail.com> > wrote: > >> Hi all, >> >> I've got a Sunday afternoon / evening / night / >> I-live-in-Asia-you-insensitive-clod >> puzzler for you. >> >> I've been working on the ebook reader Beru, and I've been getting crashes >> on start about 50% of the time. I'd been hoping that this was just related >> to launching from Qt Creator. But I tried installing it and still got >> crashes about half the time I launched it. >> >> So, I dug out the instructions for running under gdb, got a crash, and >> discovered the stack had been corrupted. Poor little Python-loving me >> didn't even know that this was a thing that could happen! >> >> I bisected to find the problem commit, and discovered that it was when I >> added sections to the first page in my page stack. Obviously this couldn't >> be the problem, but I removed the sections just to check. And the crash >> went away. >> >> Once I saw that, it was obvious that the problem was in my handler for >> changing the selected section. So I removed the handler (making the >> sections affect nothing), and the crash remained! >> >> To try to separate the crash from the general hubbub of initialization, I >> removed the sections from the Page head, and set them procedurally after >> everything was loaded. Obviously, this wouldn't make a difference. But it >> stopped the crashes. >> >> So far, I'm batting 0-for-3 on this one. So I'd like to hear if any of >> you have an idea what's going on. For now, delaying setting the sections >> is working, but I have a feeling that I'm jut hiding a bug. I'd like to >> find and fix it, or at least assure myself that this is a sensible >> work-around. >> >> I haven't managed to come up with a simple test case yet. A basic >> page-with-sections test works just fine, so it has something to do with all >> the other things going on. Here's the problematic commit [1], the solution >> commit [2], and a bug report with some more info [3]. You're welcome to >> reply to the bug if you'd rather not do this over the list. >> >> Thanks, >> Robert >> >> [1] https://github.com/rschroll/beru/commit/ >> 9f8a299d0ecc5c6454e0b2b5d8f54a883b4b3328 >> [2] https://github.com/rschroll/beru/commit/ >> 4d521b66e83596ce2a6cb9587e523bae1db0a1d4 >> [3] https://github.com/rschroll/beru/issues/82 >> >> >> -- >> Mailing list: https://launchpad.net/~ubuntu-phone >> Post to : ubuntu-phone@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~ubuntu-phone >> More help : https://help.launchpad.net/ListHelp >> > > > -- > Mailing list: https://launchpad.net/~ubuntu-phone > Post to : ubuntu-phone@lists.launchpad.net > Unsubscribe : https://launchpad.net/~ubuntu-phone > More help : https://help.launchpad.net/ListHelp > >
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