Can you tell me how to obtain such backtrace? This is a hard panic and I don't know how to obtain a backtrace, since the keyboard gets unresponsive. On Thu, Dec 10, 2009 at 11:19 AM, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > Hi Pablo, > > On Monday 07 December 2009 18:18:11 Pablo Baena wrote: >> I get a kernel panic when running the attached sample code. >> >> I run it as: >> >> $ gcc capture.c -o capture >> $ export LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so >> $ ./capture -d/dev/video0 -c1000 -r >> >> -r tells it to capture using read(), which libv4l emulates. >> >> In the example code, I use read() to fetch from the webcam directly, >> without using select() to wait for a frame. In the v4l documentation, >> it states that read() should block until it has a new frame available. >> >> This is a Bus 002 Device 005: ID 0c45:62c0 Microdia Sonix USB 2.0 Camera. >> >> I can't capture the kernel panic because everything hangs and I have >> no kernel debugger to try to get that info. I attach a poor quality >> image taken with a webcam from the screen. I even tried having a >> vmware virtual machine to try to better capture the panic, but in the >> virtual machine it doesn't hang. >> >> This is Ubuntu 9.10, Linux pablo-laptop 2.6.31-16-generic #52-Ubuntu >> SMP Thu Dec 3 22:00:22 UTC 2009 i686 GNU/Linux. >> >> But I got reports that the same camera on Debian 5.3 is also panicking. >> >> Please advice if you need more information to solve this problem. > > I can't reproduce the problem here (with another camera). > > To investigate I will need a copy of the source code and binary kernel module > for the uvcvideo driver running on your system as well as a complete complete > backtrace. > > -- > Regards, > > Laurent Pinchart > -- "Not possessing the gift of reflection, a dog does not know that he does not know, and does not understand that he understands nothing; we, on the other hand, are aware of both. If we behave otherwise, it is from stupidity, or else from self-deception, to preserve our peace of mind." -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
