Showing error 1175

User: Jiri Slaby
Error type: Double Unlock
Error type description: Some lock is unlocked twice unintentionally in a sequence
File location: mm/mmap.c
Line in file: 637
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Entered: 2012-04-30 10:52:00 UTC

Source: 

 607
 608        if (root) {
 609                if (adjust_next)
 610                        vma_prio_tree_insert(next, root);
 611                vma_prio_tree_insert(vma, root);
 612                flush_dcache_mmap_unlock(mapping);
 613        }
 614
 615        if (remove_next) {
 616                /*
 617                 * vma_merge has merged next into vma, and needs
 618                 * us to remove next before dropping the locks.
 619                 */
 620                __vma_unlink(mm, next, vma);
 621                if (file)
 622                        __remove_shared_vm_struct(next, file, mapping);
 623                if (next->anon_vma)
 624                        __anon_vma_merge(vma, next);
 625        } else if (insert) {
 626                /*
 627                 * split_vma has split insert from vma, and needs
 628                 * us to insert it before dropping the locks
 629                 * (it may either follow vma or precede it).
 630                 */
 631                __insert_vm_struct(mm, insert);
 632        }
 633
 634        if (anon_vma)
 635                spin_unlock(&anon_vma->lock);
 636        if (mapping)
 637                spin_unlock(&mapping->i_mmap_lock);
 638
 639        if (remove_next) {
 640                if (file) {
 641                        fput(file);
 642                        if (next->vm_flags & VM_EXECUTABLE)
 643                                removed_exe_file_vma(mm);
 644                }
 645                mm->map_count--;
 646                mpol_put(vma_policy(next));
 647                kmem_cache_free(vm_area_cachep, next);
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