[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

--- Comment #7 from Alexander Y.  Fomichev (git.user@xxxxxxxxx) ---
Ok, it looks like a warning is a result of missing sb_end_intwrite in
xfs_reflink_allocate_cow, namely in a sequence xfs_trans_alloc -> goto retry ->
goto convert. With proof-of-concept patch (attached) warning is gone but
deadlock is not. Though now I have a list of held locks (dmesg attached).
Did you mean taintad kernel  will not show locks held?

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