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This bug has been copied from bug #1380521 and has been proposed
to be backported to 7.3 z-stream (EUS).

Marian,

these 4 commits have to be applied to fix the deadlock:

commit 76f6951c3e8f0933df9730a42e9c46f273d1da24
commit e5b6f2685a462fbdd262685b39c2ac186475a051
commit 506d88a2ec8cc4960b907b2cf34ca5786d060943
commit a37bb7b2a509f2d27800470af1a7a339a7c73794