On Fri, 2 Oct 2015 12:27:45 -0700 Maxim Patlasov <mpatla...@parallels.com> wrote:
> On 10/02/2015 04:21 AM, Konstantin Khlebnikov wrote: > > Bump. Add more peopple in CC. > > > > On Mon, Sep 21, 2015 at 1:02 PM, Roman Gushchin <kl...@yandex-team.ru> > > wrote: > >> I got a report about unkillable task eating CPU. Thge further > >> investigation shows, that the problem is in the fuse_fill_write_pages() > >> function. If iov's first segment has zero length, we get an infinite > >> loop, because we never reach iov_iter_advance() call. > > iov_iter_copy_from_user_atomic() eventually calls iterate_iovec(). The > latter silently consumes zero-length iov. So I don't think "iov's first > segment has zero length" can cause infinite loop. I'm suspecting it got stuck because local variable `bytes' is zero, so the code does `goto again' repeatedly. Or maybe not. A more complete description of the bug would help. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
