Hi Juan, you are right, I just changed the summary. This bug is supper annoying, as I always loose all my work. How should we debug it? The best would be to figure out some way to reproduce it reliably, but that seems like a very hard problem.
So a better way would be to somehow use the memory addresses in the stacktrace to figure out where in the code the problem happens, and then add some debug prints over there. Here is the stacktrace, anyone know how to proceed? [ 4343.791] 0: /usr/bin/X (xorg_backtrace+0x26) [0x4a2626] [ 4343.791] 1: /usr/bin/X (0x400000+0x6219a) [0x46219a] [ 4343.791] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f491f9a0000+0xfc60) [0x7f491f9afc60] [ 4343.791] 3: /usr/lib/xorg/modules/extensions/librecord.so (0x7f491d355000+0x2920) [0x7f491d357920] [ 4343.791] 4: /usr/bin/X (_CallCallbacks+0x34) [0x432af4] [ 4343.791] 5: /usr/bin/X (WriteToClient+0x21a) [0x461c9a] [ 4343.791] 6: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x52) [0x7f491cd3cd82] [ 4343.791] 7: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x59) [0x7f491cd3b479] [ 4343.791] 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f491cae8000+0x25030) [0x7f491cb0d030] [ 4343.791] 9: /lib/x86_64-linux-gnu/libdrm.so.2 (drmHandleEvent+0x108) [0x7f491cf46478] I have one idea. The stacktrace above seems to be generated by this code here: https://github.com/jolicloud/xorg- server/blob/2a006327f17f448461aecc715fabef1b0d9caa1f/os/backtrace.c however, there is a way to obtain way better stacktrace (with files and line numbers!) using code, that I wrote. So one way to go forward would be to replace xorg_backtrace() with my own code. Then, I will introduce some simple bug in the code, like "char *p=NULL; *p=1", to test it. If it works, then I'll simply wait couple days, and once it crashes again, we'll nail it down. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/778261 Title: Periodic Xorg crashes in intel_drv.so -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
