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SubjectRe: update-binfmts breaking suspend was Re: x32 suspend failuer in Re: linux-next: Tree for Apr 4
Hi!

> > Well, v4.16-rc4 is parent of v4.16-rc6, but next-20180304 is not
> > parent of next-20180307.
> >
> > But you are right that if I do bisect between -linus and -next, it
> > should work.
> >
> > Anyway, does s2ram work for you in -next? Are you testing 32bit?
>
> Hmm. I tested on T40p. That works ok, so at least some 32bit machines
> do work.
>
> Hmm, and my test scripts were wrong.
>
> Failure is not a hang, as they expect, but... machine locks up, but
> does not suspend, and then continues running after a delay..
>
> [ 35.038766] PM: Syncing filesystems ... done.
> [ 35.051246] Freezing user space processes ...
> [ 55.060528] Freezing of tasks failed after 20.009 seconds (1 tasks
> refusing to freeze, wq_busy
> =0):
> [ 55.060552] update-binfmts D 0 2727 1 0x80000004
> [ 55.060576] Call Trace:
> [ 55.060600] __schedule+0x37a/0x7e0
> [ 55.060618] schedule+0x29/0x70
> [ 55.060635] autofs4_wait+0x359/0x7a0
> [ 55.060653] ? wait_woken+0x70/0x70
> [ 55.060668] autofs4_mount_wait+0x4a/0xe0
> [ 55.060684] ? autofs4_mount_wait+0x4a/0xe0
> [ 55.060699] autofs4_d_automount+0xe0/0x200
> [ 55.060715] ? autofs4_d_automount+0xe0/0x200
>
> Did the rework of freezing start already in -next?

Hmm, so I did git bisect, and it pointed to:

commit 7cb03edf112fea6ead2fcd3c5fd639756d6d114b
Author: Matthew Wilcox <mawilcox@microsoft.com>
Date: Thu Mar 29 10:15:17 2018 +1100

autofs4: use wait_event_killable

This playing with signals to allow only fatal signals appears to
predate
the introduction of wait_event_killable(), and I'm fairly sure
that
wait_event_killable is what was meant to happen here.

Link:
http://lkml.kernel.org/r/20180319191609.23880-1-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton
<akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>




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