Re: next: /dev/root: Can't open blockdev

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On Tue, 6 Feb 2024 at 17:58, Jan Kara <jack@xxxxxxx> wrote:
>
> On Tue 06-02-24 15:53:34, Naresh Kamboju wrote:
> > On Tue, 6 Feb 2024 at 15:45, Jan Kara <jack@xxxxxxx> wrote:
> > >
> > > On Tue 06-02-24 14:41:17, Naresh Kamboju wrote:
> > > > All qemu's mount rootfs failed on Linux next-20230206 tag due to the following
> > > > kernel crash.
> > > >
> > > > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
> > > >
> > > > Crash log:
> > > > ---------
> > > > <3>[    3.257960] /dev/root: Can't open blockdev
> > > > <4>[    3.258940] VFS: Cannot open root device "/dev/sda" or
> > > > unknown-block(8,0): error -16
> > >
> > > Uhuh, -16 is EBUSY so it seems Christian's block device opening changes are
> > > suspect? Do you have some sample kconfig available somewhere?
> >
> > All build information is in this url,
> > https://storage.tuxsuite.com/public/linaro/lkft/builds/2byqguFVp7MYAEjKo6nJGba2FcP/
>
> Thanks! So for record the config has:
>
> CONFIG_BLK_DEV_WRITE_MOUNTED=y
>
> So we are not hitting any weird corner case with blocking writes to mounted
> filesystems. It must be something else.

As per Anders bisection results the first bad commit pointing to
   ba858e55b205 ("bdev: open block device as files")

- Naresh




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