[seL4] endpoint.c

Hello.

I have a problem with endpoint.c test (RECYCLE0001):

Error: seL4_MessageInfo_get_label(tag) == seL4_InvalidCapability at line 50 of file /long/path/apps/sel4test-tests/src/tests/endpoints.c

I am reading MR(0) in call_func above this check and see, that seL4_Call returns values that were sent before. For example, 100 for the first thread, 101 for the second and etc. Thus, as far I understand, cnode_recycle does not work at all. I am pretty sure that my seL4_Call syscall was implemented properly. I have looked inside the kernel, and tried to track everything related to cteRecycle and do not see anything platform specific. I know that it is a complicated question, but any ideas or hints where to look?

Thank you