Hello, since test11, the merge_segments() routine assumes that every VMA that it frees has been locked with lock_vma_mappings(). While most callers have been adapted to perform this locking, at least two, do_mlock and sys_mprotect, do *not* currently. This causes a deadlock in certain situations. What's the correct way to fix this? In mlock and mprotect, potentially many segments could be freed; do we need to call lock_vma_mappings on all of them before calling merge_segments? Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand Linux for S/390 Design & Development IBM Deutschland Entwicklung GmbH, Schoenaicher Str. 220, 71032 Boeblingen Phone: +49-7031/16-3727 --- Email: [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/