Re: [Bug 75101] New: [bisected] s2disk / hibernate blocks on "Saving 506031 image data pages () ..."

[Andrew Morton <akpm@linux-foundation.org>]

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Tue, 29 Apr 2014 20:13:44 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=75101
> 
>             Bug ID: 75101
>            Summary: [bisected] s2disk / hibernate blocks on "Saving 506031
>                     image data pages () ..."
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: v3.14
>           Hardware: All
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>           Assignee: akpm@linux-foundation.org
>           Reporter: oliverml1@oli1170.net
>         Regression: No
> 
> Created attachment 134271
>   --> https://bugzilla.kernel.org/attachment.cgi?id=134271&action=edit
> Full console trace with various SysRq outputs
> 
> Since v3.14 under normal desktop usage my s2disk/hibernate often blocks on the
> saving of the image data ("Saving 506031 image data pages () ...").

A means to reproduce as well as a bisection result.  Nice!  Thanks.

Johannes, could you please take a look?

> With following test I can reproduce the problem reliably:
> ---
> 0) Boot
> 
> 1) Fill ram with 2GiB (+50% in my case)
> 
> mount -t tmpfs tmpfs /media/test/
> dd if=/dev/zero of=/media/test/test0.bin bs=1k count=$[1024*1024]
> dd if=/dev/zero of=/media/test/test1.bin bs=1k count=$[1024*1024]
> 
> 2) Do s2disk 
> 
> s2disk
> 
> ---
> s2disk: Unable to switch virtual terminals, using the current console.
> s2disk: Snapshotting system
> s2disk: System snapshot ready. Preparing to write
> s2disk: Image size: 2024124 kilobytes
> s2disk: Free swap: 3791208 kilobytes
> s2disk: Saving 506031 image data pages (press backspace to abort) ...   0%
> 
> #Problem>: ... there is stays and blocks. SysRq still responds, so that I could
> trigger various debug outputs.
> ---
> 
> I've bisected this to following commit:
> ---
> commit a1c3bfb2f67ef766de03f1f56bdfff9c8595ab14 (HEAD, refs/bisect/bad)
> Author: Johannes Weiner <hannes@cmpxchg.org>
> Date:   Wed Jan 29 14:05:41 2014 -0800
> 
>     mm/page-writeback.c: do not count anon pages as dirtyable memory
> 
> [...]
> ---
> 
> Reverting a1c3bfb2 fixes s2disk for me again - so basically I'm ok ;). But
> maybe there is still another better solution.
> 
> Attached is a full console trace with various SysRq outputs, possibly useful
> for analyzing.
> 
> BR, Oliver
> 

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