On Tue, Jun 19, 2018 at 02:22:30AM -0700, Matthew Wilcox wrote:
> On Mon, Jun 18, 2018 at 09:12:57PM -0600, Ross Zwisler wrote:
> > Hit another deadlock. This one reproduces 100% of the time in my setup with
> > XFS + DAX + generic/340. It doesn't reproduce for me at all with
> > next-20180615. Here's the output from "echo w > /proc/sysrq-trigger":
>
> *sigh*. I wonder what the differences are between our setups ...
>
> > [ 92.849119] sysrq: SysRq : Show Blocked State
> > [ 92.850506] task PC stack pid father
> > [ 92.852299] holetest D 0 1651 1466 0x00000000
> > [ 92.853912] Call Trace:
> > [ 92.854610] __schedule+0x2c5/0xad0
> > [ 92.855612] schedule+0x36/0x90
> > [ 92.856602] get_unlocked_entry+0xce/0x120
> > [ 92.857756] ? dax_insert_entry+0x2b0/0x2b0
> > [ 92.858931] grab_mapping_entry+0x19e/0x250
> > [ 92.860119] dax_iomap_pte_fault+0x115/0x1140
> > [ 92.860836] dax_iomap_fault+0x37/0x40
> ...
> > This looks very similar to the one I reported last week with generic/269.
>
> Yeah, another missing wakeup, no doubt. Can you bisect this? That was
> how I found the last one; bisected it to a single patch and stared very
> hard at the patch until I saw it. I'm not going to be in a position to
> tinker with my DAX setup until the first week of July.
It bisected to this commit:
b4b4daa7e8fb0ad0fee35d3e28d00e97c849a6cb is the first bad commit
commit b4b4daa7e8fb0ad0fee35d3e28d00e97c849a6cb
Author: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Thu Mar 29 22:58:27 2018 -0400
dax: Convert page fault handlers to XArray
This is the last part of DAX to be converted to the XArray so
remove all the old helper functions.
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
