Ok, that backtrace makes it pretty plain what's gone wrong:
Code:
_buf = radeon_drm_bufmgr_create_buffer_from_handle(ws->kman,
whandle->handle);
if (stride)
*stride = whandle->stride;
if (size)
*size = _buf->base.size;
State:
#0 radeon_r300_winsys_buffer_from_handle (rws=<value optimized out>,
whandle=0x7fffe69964b0, stride=0x7fffe69963f4, size=0x7fffe69963f0) at
radeon_r300.c:123
ws = <value optimized out>
_buf = 0x0
So, it's a simple null pointer dereference. Now we have two questions:
* How/why did radeon_drm_bufmgr_create_buffer_from_handle() give us a null
pointer?
* If that is a permissible return value, the code should check for it. Should
it still call radeon_libdrm_winsys_buffer() in this case, or just return?
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https://bugs.launchpad.net/bugs/691653
Title:
compiz crashes when using alt-tab (the radeon driver kills it)
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