lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Thu, 28 Apr 2011 09:25:14 -0500
From:	James Bottomley <>
To:	Mel Gorman <>
Cc:	Jan Kara <>,,
	Chris Mason <>,
	linux-fsdevel <>,
	linux-mm <>,
	linux-kernel <>,
	linux-ext4 <>,
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback

On Thu, 2011-04-28 at 15:07 +0100, Mel Gorman wrote:
> On Thu, Apr 28, 2011 at 03:52:28PM +0200, Jan Kara wrote:
> > On Thu 28-04-11 12:36:30, Colin Ian King wrote:
> > > One more data point to add, I've been looking at an identical issue when
> > > copying large amounts of data.  I bisected this - and the lockups occur
> > > with commit 
> > > 3e7d344970673c5334cf7b5bb27c8c0942b06126 - before that I don't see the
> > > issue. With this commit, my file copy test locks up after ~8-10
> > > iterations, before this commit I can copy > 100 times and don't see the
> > > lockup.
> >   Adding Mel to CC, I guess he'll be interested. Mel, it seems this commit
> > of yours causes kswapd on non-preempt kernels spin for a *long* time...
> > 
> I'm still thinking about the traces which do not point the finger
> directly at compaction per-se but it's possible that the change means
> kswapd is not reclaiming like it should be.
> To test this theory, does applying
> [d527caf2: mm: compaction: prevent kswapd compacting memory to reduce
> CPU usage] help?

I can answer definitively no to this.  The upstream kernel I reproduced
this on has that patch included.


To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists