On Tue, May 24, 2016 at 07:58:13PM -0500, Matthew McClintock wrote: > > > On May 24, 2016, at 6:41 PM, Al Viro <v...@zeniv.linux.org.uk> wrote: > > > > Again, I understand what's going on kernel-side; the only tricky part is how > > to fix it without bringing the nasal daemons back. I think I have a > > solution > > and I'm going to post it tonight if it survives the local beating. In any > > case, the testcase above deserves being added to LTP - it's a real > > regression. > > I’m running a simple busybox rootfs with the following init script: > > https://gist.github.com/7b12fdb5d7def9a835291a79c060fa07 > > And inittab: > > https://gist.github.com/5a840b7eaa48f321836125f15147d0e9 > > Happy to turn on ftrace, dyndbg, and provide more logs.
Slap the WARN_ON(!size); in the very beginning of iov_iter_advance(), see where it's triggered...
