On Fri, Nov 13, 2020 at 09:14:20PM -0700, Nathan Chancellor wrote: > Unfortunately that patch does not solve my issue. Is there any other > debugging I should add? Hmm... I wonder which file it is; how about if (WARN_ON(!iovec.iov_len)) printk(KERN_ERR "odd readv on %pd4\n", file); in the loop in fs/read_write.c:do_loop_readv_writev()?