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 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
