[3.16-rc1] BUG: fsync not finishing during rootfs mount (getty doesn't finish)

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Hi,


I updated 2 computers to 3.16-rc1 and they both did the same thing when
mounting the rootfs: after entering the login/password, the shell didn't
appear.
120 seconds later, there is a message about a hung task, it's about
fsync not finishing, with a traceback showing SyS_fsync / ... /
btrfs_sync_file / btrfs_wait_ordered_range / ...

The linux-btrfs/for-linus doesn't have this problem, so it looks like
it's about integration in -rc1.

Side note: after that, the filesystem is not mountable if I
forcibly reboot the computer or try to mount it elsewhere (with 3.15).
We've had to use btrfs-select-super to allow it to mount.

I'm on #btrfs, have gotten help from xaba and kdave.


Regards,

-- 
Jérôme
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