Bug report: kernel hangs when mounting a crafted xfs image

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When mounting a crafted xfs v4 image, the kernel hangs and never returns for mount operation. Suspect potential deadlock in log recovery exists. Not sure it is considered as a bug or not.

- Reproduce (on 4.17 upstream kernel)
# mkdir mnt
# mount -t xfs 0.img mnt

The image file (0.img.zip) is available here: https://bugzilla.kernel.org/attachment.cgi?id=276475

Thanks,
Wen--
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