NOVA: Capability selectors cause call of invalid portal

[Alexander Boettcher]

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Hello,

this is a known issue described in [0]. The available fix [1] is
currently not in genode master nor staging. If you want you can give
it a try.

Cheers,

Alex.

[0] https://github.com/genodelabs/genode/issues/247
[1] https://github.com/alex-ab/genode/tree/issue247

On 30.07.2012 19:19, Markus Partheymueller wrote:
> Hi,
> 
> I am quite stuck with a problem I encountered when using a timer 
> connection in Vancouver. As soon as the unique IDs of the 
> capabilities for RPC reach numbers >= 0x100000, RPC calls fail 
> because of calls to invalid portal numbers. In my particular case, 
> there are 4 portals created:
> 
> [ 0] EC:0xc0019f00 SYS_CREATE PT:0x1a06 EC:0xa7 EIP:0x139950 [ 0] 
> EC:0xc0019f00 SYS_CREATE PT:0x1a07 EC:0xa7 EIP:0x1398d0 [ 0] 
> EC:0xc0019f00 SYS_CREATE PT:0x1a08 EC:0xa7 EIP:0x139950 [ 0] 
> EC:0xc0019f00 SYS_CREATE PT:0x1a09 EC:0xa7 EIP:0x1398d0
> 
> In base/include/base/rpc_client.h, I inserted a debug statement 
> showing that the "internal" portal being called is 0x82260. I think
> this is due to the translation between global capability selectors
> and NOVA portals, is that correct?
> 
> When the internal IDs hit 0x100000, what happens is this:
> 
> [ 0] EC:0xc0019f00 SYS_CREATE PT:0x30e6 EC:0xa7 EIP:0x139950 [ 0] 
> EC:0xc0019f00 SYS_CREATE PT:0x30e7 EC:0xa7 EIP:0x1398d0 [ 0] 
> EC:0xc0019f00 SYS_CREATE PT:0x30e8 EC:0xa7 EIP:0x139950 [ 0] 
> EC:0xc0019f00 SYS_CREATE PT:0x30e9 EC:0xa7 EIP:0x1398d0
> 
> But the next event in NOVA is a call to portal number 0x100018, 
> which doesn't exist because it was not created beforehand. It
> seems to me that from this point in time, the internal IDs are
> being used as NOVA portals somehow. But all I found was this
> unmarshalling method in base-nova/include/base/ipc.h:
> 
> inline void 
> Genode::Ipc_istream::_unmarshal_capability(Genode::Native_capability
>
>
> 
&cap)
> { long unique_id = 0; _read_from_buf(unique_id); int pt_sel = 
> unique_id != ~0L ? _rcv_msg->rcv_pt_sel() : 0;
> 
> cap = Native_capability(pt_sel, unique_id); }
> 
> I put another debug instruction there and found out that 
> rcv_pt_base was 0x100018, when the call failed.
> 
> Right now I'm quite lost in all that RPC and Capability wrangling.
>  Maybe someone can shed some light on this? How is that translation
>  between internal IDs and NOVA portals done, anyway?
> 
> Cheers
> 
> Markus
> 
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