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From: Adam Borowski <kilobyte@angband.pl>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: hang in dax_pmem_compat_release on changing namespace mode
Date: Thu, 19 Sep 2019 17:50:54 +0200	[thread overview]
Message-ID: <20190919155054.GB24650@angband.pl> (raw)
In-Reply-To: <20190919154708.GA24650@angband.pl>

On Thu, Sep 19, 2019 at 05:47:08PM +0200, Adam Borowski wrote:
> On Thu, Sep 19, 2019 at 08:10:47AM -0700, Dan Williams wrote:
> > On Thu, Sep 19, 2019 at 4:56 AM Adam Borowski <kilobyte@angband.pl> wrote:
> > > If I try to change the mode of a devdax namespace that's in use (mapped by
> > > some process), ndctl hangs:
> > 
> > Is it merely mapped, or might the pages be actively pinned / in use by
> > another part of the kernel? The kernel has no choice but to wait for
> > active page pins to drain. Can you get a stack trace of the process
> > with the dev-dax instance mapped?
> 
> Looks like the behaviour is different depending on what the other process
> is:
> * with qemu, the hang is 100% reproducible, the guest continues to work and
>   cleanly exits -- qemu does not exit on its own (unlike normal case) but
>   SIGTERM terminates it correctly.  Thus, qemu is not stuck, only ndctl is.

Correction: not 100%.  I just had qemu die with SIGBUS instead.


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      parent reply	other threads:[~2019-09-19 15:50 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-19 11:55 hang in dax_pmem_compat_release on changing namespace mode Adam Borowski
2019-09-19 15:10 ` Dan Williams
2019-09-19 15:47   ` Adam Borowski
2019-09-19 15:50     ` Dan Williams
2019-09-19 15:50     ` Adam Borowski [this message]

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