On entry to an ESTAE-type recovery routine, the current linkage stack entry is the same as it was at the time of the error, unless a previous recovery routine added entries to the linkage stack through a PC or BAKR instruction and did not remove them. In such a case, when percolation occurs and the recovery routine gets control, the linkage stack contains additional entries beyond what was the current entry at the time of the error for which the recovery routine received control. IBM® recommends that any recovery routines that add entries to the linkage stack also remove them.