Hi Bob,
On 06/13/2017 04:32 PM, Bob Stewart wrote:
Thanks for the reply, Norman.
I doubt that it is related to explicit routing declarations as I have a default routing set to go through all parents, all children. Or, am I misunderstanding routing? This run script and component code work in 16.11 and 17.02. So the problem is being caused by a change in 17.05.
I finally looked into child.h. The actual error is Service Denied. The ctrl_module component which is having this start up problem is trying to establish a session to a server which accesses a core-only service. I had to create this service because the SOC requires privileged access to enable hardware subsystems or to establish a specific gpio pin mux setting. The associated code has been working well since 2015. I'll trace the code back to the origin of the Service Denied state and find out what I have missed in the 17.05 changes.
Regarding the two log lines:
[init -> gpio_drv] used before freeing emergency=276K [init -> gpio_drv] used after freeing emergency=260K
These seem to be indicating an emergency allocation of memory had to be made. Does that mean the components RAM quota was insufficient?
Apart from the hints mentioned by Norman, we observed a regression related to base-hw after introducing the new capability quota trading in Genode. It has to do with capability memory shortage in the kernel. The already available memory upgrade mechanism does not work correctly anymore, because it got overloaded with other PD session upgrades. The emergency memory release you are observing can be an indicator for this problem. Unfortunately, the regression got part of the release 17.05, but there are two commits available that solve the problem. Those are its hashes:
fb447f0727ca84d2f8907c344fa1954b7a9b217e e54b7174bcdb3fdc47d5b99e501c3620ea131caf
Alternatively, you may use today's staging branch to proceed, which do already contain both commits.
Best regards Stefan
Thanks, Bob Get Outlook for Android https://aka.ms/ghei36
*From:* Norman Feske <norman.feske@...1...> *Sent:* Tuesday, June 13, 2017 4:26:57 AM *To:* genode-main@lists.sourceforge.net *Subject:* Re: Release 17.05, base-hw, environment ROM session denied error
Hi Bob,
"[init] Error: ctrl_module: environment ROM session denied (label="ctrl_module",
ram_quota=6144, cap_quota=3, diag=0) "
What is this message telling me?
traditionally, init created the initial sessions (aka environment sessions) of its children on the children's behalf without considering any child-specific routing. I.e., a child's PD session, CPU session, the ROM session with the executable binary, the ROM session with the dynamic linker were created by init directly via 'Connection' objects. Therefore, there was no need to route those sessions explicitly in the configuration.
With version 16.11 and 17.02 [1], we revised the child-creation procedure. Now, the environment sessions are subjected to the routing rules as dictated by init's configuration.
[1] http://genode.org/documentation/release-notes/17.02#Routing_of_environment_s...
In short, your routing rules for the "ctrl_module" lack a valid route for the executable binary.
Also, further down the log is the following output:
init -> gpio_drv] resource_request: ram_quota=0, cap_quota=4
[init -> gpio_drv] used before freeing emergency=276K
[init -> gpio_drv] used after freeing emergency=260K
I believe these are a result of the gpio server setting up a session through the session interface.
The 'gpio_drv' component runs out of its capability quota and politely asks its parent (init) for more (cap_quota=4). Capability quotas are new in version 17.05 and are described at [2].
[2] http://genode.org/documentation/release-notes/17.05#Assignment_and_trading_o...
You may try to specify a 'caps=200' attribute to the start node of the corresponding component.
Cheers Norman
-- Dr.-Ing. Norman Feske Genode Labs
http://www.genode-labs.com · http://genode.org
Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
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