There is no clear reason why that would explode; looks more or less like a corrupt screen->dirty_pixmap_list. An alternative explanation would be that ScrnInfo->pScreen is NULL - would be extremely reproducible, and equally impossible. So memory corruption?
There is no clear reason why that would explode; looks more or less like a corrupt screen- >dirty_ pixmap_ list. An alternative explanation would be that ScrnInfo->pScreen is NULL - would be extremely reproducible, and equally impossible. So memory corruption?