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    SubjectRe: multipath: I/O hanging forever
    On Sat, Mar 05, 2016 at 08:31:03PM -0900, Kent Overstreet wrote:
    > On Fri, Mar 04, 2016 at 10:30:44AM -0700, Andrea Righi wrote:
    > > On Sun, Feb 28, 2016 at 08:46:16PM -0700, Andrea Righi wrote:
    > > > On Sun, Feb 28, 2016 at 06:53:33PM -0700, Andrea Righi wrote:
    > > > ...
    > > > > I'm using 4.5.0-rc5+, from Linus' git. I'll try to do a git bisect
    > > > > later, I'm pretty sure this problem has been introduced recently (i.e.,
    > > > > I've never seen this issue with 4.1.x).
    > > >
    > > > I confirm, just tested kernel 4.1 and this problem doesn't happen.
    > >
    > > Alright, I had some spare time to bisect this problem and I found that
    > > the commit that introduced this issue is c66a14d.
    > >
    > > So, I tried to revert the commit (with some changes to fix conflicts and
    > > ABI changes) and now multipath seems to work fine for me (no hung task).
    >
    > Is it hanging on first IO, first large IO, or just randomly?

    It's always the very first O_DIRECT I/O, in general the task gets stuck
    in do_blockdev_direct_IO().

    Thanks,
    -Andrea

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