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bug#43344: "basic" system tests fail (and all the other ones) on guix ma

From: Danny Milosavljevic
Subject: bug#43344: "basic" system tests fail (and all the other ones) on guix master
Date: Thu, 17 Sep 2020 17:28:06 +0200

Hi Leo,

On Thu, 17 Sep 2020 10:05:44 -0400
Leo Famulari <leo@famulari.name> wrote:

> On Wed, Sep 16, 2020 at 09:36:49PM -0400, Mark H Weaver wrote:
> > > On Wed, Sep 16, 2020 at 04:52:45PM +0200, Danny Milosavljevic wrote:  
> > >> commit 692d0626557451c4b557397f20b7394b612d0289
> > >> Author: Christoph Hellwig <hch@lst.de>
> > >> Date:   Tue Sep 1 11:59:41 2020 +0200
> > >> 
> > >>     block: fix locking in bdev_del_partition  
> > Next, it probably makes sense to test 5.8.9 with the above commit
> > reverted.  Would someone like to try it?  If that works, we can avoid
> > the bisection, resume kernel updates, and revert this change across all
> > of our kernels until a better solution is found.  
> Using linux-libre 5.8.9 with that commit reverted, `guix system vm` does
> work again.

Thanks for testing it!

What the commit does is lock the drive whose partition table is being
modified.  That sounds like a good idea in general.  But parted does not
expect the error code ENOMEM and thus misjudges the situation.

See also:


for the fix that goes into Linux 5.9.

We could also patch parted to also accept ENOMEM in addition to ENXIO if we
wanted to.  I wouldn't (it diverges from what upstream is doing--too much work).

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