Just ran into this with CONFIG_IPIPE_DEBUG_CONTEXT (maybe due to some
bug of my own):

[  102.616000] I-pipe: Detected illicit call from domain 'Xenomai'
[  102.616000]         into a service reserved for domain 'Linux' and below.
[  102.616000]        c741bdc8 00000000 00000000 c8860ef8 c741bdec c0105683 
c032c200 c13fe22c
[  102.616000]        c0361f00 c741be08 c01519ed c032f5b8 c032c742 c03380b3 
c8885100 c78beac0
[  102.616000]        c741be14 c0142ce9 c7a80b30 c741be3c c884d075 c885f150 
c8860ef8 c741be3c
[  102.616000] Call Trace:
[  102.616000]  [<c0104d9f>] show_trace_log_lvl+0x1f/0x40
[  102.616000]  [<c0104e71>] show_stack_log_lvl+0xb1/0xe0
[  102.616000]  [<c0105683>] show_stack+0x33/0x40
[  102.616000]  [<c01519ed>] ipipe_check_context+0xad/0xc0
[  102.616000]  [<c0142ce9>] module_put+0x19/0x90
[  102.616000]  [<c884d075>] xnshadow_unmap+0xb5/0x130 [xeno_nucleus]
[  102.616000]  [<c8871dc5>] __shadow_delete_hook+0x25/0x30 [xeno_native]
[  102.616000]  [<c8842f78>] xnpod_schedule+0xb58/0x12f0 [xeno_nucleus]
[  102.616000]  [<c8844bfb>] xnpod_delete_thread+0x2cb/0x3d0 [xeno_nucleus]
[  102.616000]  [<c886f5bd>] rt_task_delete+0x20d/0x220 [xeno_native]

I would dare to say that module_put in xnshadow_unmap is not well placed
as it can wakeup a Linux process. The module ref-counter maintenance
needs some postponing, I guess.

Jan

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