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Bug Description: a customer reported under IRQ stress, running applications may wrongly trigger an ICPLB miss and be killed. after playing a bit more, here's a test case that may be triggering the same bug. Fixing: After modifying page protections, only modify the active CPLBs if the protection change was made for the active mm. Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org>