On 12/22/2014 01:01 PM, Kirill A. Shutemov wrote: > On Mon, Dec 22, 2014 at 10:04:02AM -0500, Sasha Levin wrote: >> > Hi all, >> > >> > While fuzzing with trinity inside a KVM tools guest running the latest -next >> > kernel, I've stumbled on the following spew: >> > >> > [ 432.376425] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 >> > [ 432.378876] IP: down_write (./arch/x86/include/asm/rwsem.h:105 ./arch/x86/include/asm/rwsem.h:121 kernel/locking/rwsem.c:71) > Looks like vma->vm_file->mapping is NULL. Somebody freed ->vm_file from > under us? > > I suspect Davidlohr's patchset on i_mmap_lock, but I cannot find any code > path which could lead to the crash. I've reported a different issue which that patchset: https://lkml.org/lkml/2014/12/9/741 I guess it could be related? Thanks, Sasha -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>