[Bug 200981] hypervisor fs hangs at heavy write activity on VM (kvm, qcow2 image) having a reflink disk copy

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https://bugzilla.kernel.org/show_bug.cgi?id=200981

Dave Chinner (david@xxxxxxxxxxxxx) changed:

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--- Comment #4 from Dave Chinner (david@xxxxxxxxxxxxx) ---
Ok, so the obvious fix doesn't help.

Any idea why lockdep is not giving you the full stack trace of where the lock
that was leaked to userspace was first accessed? Without that, we have no idea
which of the 70-odd calls to xfs_trans_alloc() in the XFS code the lockdep
warning refers to. At minimum, we need to know what syscall is triggering the
warning so we know what code to look at.

Also, can you reproduce this on older kernels? If not, could you bisect it?

-Dave.

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