On 26/03/2018 00:10, David Rientjes wrote: > On Wed, 21 Mar 2018, Laurent Dufour wrote: > >> I found the root cause of this lockdep warning. >> >> In mmap_region(), unmap_region() may be called while vma_link() has not been >> called. This happens during the error path if call_mmap() failed. >> >> The only to fix that particular case is to call >> seqcount_init(&vma->vm_sequence) when initializing the vma in mmap_region(). >> > > Ack, although that would require a fixup to dup_mmap() as well. You're right, I'll fix that too. Thanks a lot. Laurent.
