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[Thomas Krause <513523@xxxxxxxxxxxxxxxxxx>]

Webots still freezes under Maverick, but I also updated the Webots
Version to 6.3.0. So I'm not 100% sure if I should open a new bug. But
the symptoms are exactly the same: as soon as I open a simulation where
one of the robots uses a camera I get a freeze of my system. But I was
able to get some more console output. The libdrm-intel1 package version
2.4.21-1ubuntu2 seems to have some more error handling code and I get
several error messages like

../../intel/intel_bufmgr_gem.c:1150: Error writing data to buffer 467: (0 23112) Bad address .
../../intel/intel_bufmgr_gem.c:1150: Error writing data to buffer 485: (0 17424) Bad address .

I had a look at the source file and it seems that the following code
fails

static int
drm_intel_gem_bo_subdata(drm_intel_bo *bo, unsigned long offset,
                         unsigned long size, const void *data)
{
        drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *) bo->bufmgr;
        drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
        struct drm_i915_gem_pwrite pwrite;
        int ret;

        memset(&pwrite, 0, sizeof(pwrite));
        pwrite.handle = bo_gem->gem_handle;
        pwrite.offset = offset;
        pwrite.size = size;
        pwrite.data_ptr = (uint64_t) (uintptr_t) data;
        do {
                ret = ioctl(bufmgr_gem->fd,
                            DRM_IOCTL_I915_GEM_PWRITE,
                            &pwrite);
        } while (ret == -1 && errno == EINTR);
        if (ret != 0) {
                ret = -errno;
                fprintf(stderr,
                        "%s:%d: Error writing data to buffer %d: (%d %d) %s .\n",
                        __FILE__, __LINE__, bo_gem->gem_handle, (int)offset,
                        (int)size, strerror(errno));
        }

        return ret;
}

Searching in Launchpad for this function I found the following bug report that might be related:
#475429 which refers to the upstream bug http://bugs.freedesktop.org/show_bug.cgi?id=26016

** Bug watch added: freedesktop.org Bugzilla #26016
   http://bugs.freedesktop.org/show_bug.cgi?id=26016

-- 
[i965] 64 bit Webots simulator freezes system with Intel GM965
https://bugs.launchpad.net/bugs/513523
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