Xorg segfault in DRIDoBlockHandler

[Tormod Volden]

X suddenly restarted (it was probably running a 3D screensaver). Will attach apport crash log. I had compiled the xserver-xorg-core package myself, with debug settings "debug nostrip noopt". From the original 1.1.1-0ubuntu12 I had also added some asserts to hw/xfree86/dri/dri.c

[Tormod Volden (tormodvolden)]

In case it confuses the disassembly, here you can see the inserted "assert" in my source:

void
DRIDoBlockHandler(int screenNum, pointer blockData,
                  pointer pTimeout, pointer pReadmask)
{
    ScreenPtr pScreen = screenInfo.screens[screenNum];
    DRIScreenPrivPtr pDRIPriv = DRI_SCREEN_PRIV(pScreen);

    assert( pDRIPriv );
    if (pDRIPriv->pDriverInfo->driverSwapMethod == DRI_HIDE_X_CONTEXT) {
        /* hide X context by swapping 2D component here */
        (*pDRIPriv->pDriverInfo->SwapContext)(pScreen,
                                              DRI_2D_SYNC,
                                              DRI_NO_CONTEXT,
                                              NULL,
                                              DRI_2D_CONTEXT,
                                              pDRIPriv->partial3DContextStore);
    }

    if (pDRIPriv->windowsTouched)
        DRM_SPINUNLOCK(&pDRIPriv->pSAREA->drawable_lock, 1);
    pDRIPriv->windowsTouched = FALSE;

    DRIUnlock(pScreen);
}

[Tormod Volden (tormodvolden)]

This is probably a duplicate of (my own) bug #60288. But why is the symbol info incomplete in this build? I used the same DEB_BUILD_OPTIONS="debug nostrip noopt".

[Tormod Volden (tormodvolden)]

The reason the symbol info was incomplete is bug #78293.