Mapping is broken when object part is mapped together with unrelated parts

[jdoerfert]

Bugzilla Link	51543
Resolution	INVALID
Resolved on	Aug 19, 2021 11:27
Version	unspecified
OS	Linux
Attachments	reproducer
CC	@alexey-bataev,@grokos,@jdenny-ornl,@jprotze

Extended Description

I was playing around with an example and I fail to understand the behavior, consequently I suspect a bug.

The test.cpp file attached shows 3 target regions. All execute 1 loop iteration and write a value into an array of size 1.
Only, the middle one uses a member of the previously mapped object.
While that should not influence the array of size 1, IMHO, it seems to do for some reason.

I see Broken: 0x0 but I would expect Broken: 0x7.

[jprotze]

Is alloc supposed to initialize the mapped this?
I think, n_ is not initialized - or initialized to 0 by the alloc. Since the object is already mapped and reference count is > 0, n_ is not mapped for the target regions.

If I either remove the mapping of this or change to map(to:,... the code works as expected.

[jdoerfert]

n_ was not initialized. My bad. Thanks Joachim!